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note
	description: "Projection to a Printer."
	legal: "See notice at end of class."
	status: "See notice at end of class."
	keywords: "printer, output, projector"
	date: "$Date: 2017-03-27 09:23:22 -0800 (Mon, 27 Mar 2017) $"
	revision: "$Revision: 100056 $"

class interface
	EV_MODEL_PRINT_PROJECTOR_IMP

create 
	make_with_context (a_world: EV_MODEL_WORLD; a_context: EV_PRINT_CONTEXT)

feature -- Access

	alternate: INTEGER_32
			-- Selects alternate mode (fills the area between
			-- odd-numbered and even-numbered polygon sides on
			-- each scan line).
			-- (from WEL_POLYGON_FILL_MODE_CONSTANTS)

	arc_cosine (v: REAL_64): REAL_64
			-- Trigonometric arccosine of radian v
			-- in the range [0, pi].
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	arc_sine (v: REAL_64): REAL_64
			-- Trigonometric arcsine of radian v
			-- in the range [-pi/2, +pi/2].
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	arc_tangent (v: REAL_64): REAL_64
			-- Trigonometric arctangent of radian v
			-- in the range [-pi/2, +pi/2].
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	Aspect_x: INTEGER_32 = 40
			-- Relative width of a device pixel
			-- used for line drawing
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Aspect_x_y: INTEGER_32 = 44
			-- Diagonal width of a device pixel
			-- used for line drawing
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Aspect_y: INTEGER_32 = 42
			-- Relative height of a device pixel
			-- used for line drawing
			-- (from WEL_CAPABILITIES_CONSTANTS)

	bitmap: detachable WEL_BITMAP
			-- Current bitmap selected.
			-- (from WEL_DC)

	Bits_pixel: INTEGER_32 = 12
			-- Number of adjacent color bits for each pixel
			-- (from WEL_CAPABILITIES_CONSTANTS)

	frozen Black_on_white: INTEGER_32 = 1
			-- Performs a Boolean AND operation using the color values for the eliminated
			-- and existing pixels. If the bitmap is a monochrome bitmap, this mode
			-- preserves black pixels at the expense of white pixels.
			-- Was declared in {WEL_STRETCH_MODE_CONSTANTS} as synonym of `stretch_andscans`.
			-- (from WEL_STRETCH_MODE_CONSTANTS)

	brush: detachable WEL_BRUSH
			-- Current brush selected.
			-- (from WEL_DC)

	ceiling (v: REAL_64): REAL_64
			-- Least integral greater than or equal to v.
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	Clip_caps: INTEGER_32 = 36
			-- See class WEL_CLIPPING_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	frozen Color_on_color: INTEGER_32 = 3
			-- Deletes the pixels. This mode deletes all eliminated lines of
			-- pixels without trying to preserve their information.
			-- Was declared in {WEL_STRETCH_MODE_CONSTANTS} as synonym of `stretch_deletescans`.
			-- (from WEL_STRETCH_MODE_CONSTANTS)

	Color_resolution: INTEGER_32 = 108
			-- Color resolution of the device in bits
			-- (from WEL_CAPABILITIES_CONSTANTS)

	cosine (v: REAL_64): REAL_64
			-- Trigonometric cosine of radian v approximated
			-- in the range [-pi/4, +pi/4].
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	Curve_caps: INTEGER_32 = 28
			-- See class WEL_CURVE_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	dabs (v: REAL_64): REAL_64
			-- Absolute of v.
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	Dib_pal_colors: INTEGER_32 = 1
			-- (from WEL_DIB_COLORS_CONSTANTS)

	Dib_rgb_colors: INTEGER_32 = 0
			-- (from WEL_DIB_COLORS_CONSTANTS)

	drawable: EV_DRAWABLE
			-- Drawable surface (screen, drawing area or pixmap).
			-- (from EV_MODEL_DRAWER)

	Driver_version: INTEGER_32 = 1
			-- Version number of the device driver
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Euler: REAL_64 = 2.7182818284590452353602874713526625
			-- Logarithm base
			-- (from MATH_CONST)

	exp (x: REAL_64): REAL_64
			-- Exponential of v.
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	Floodfillborder: INTEGER_32 = 0
			-- (from WEL_FLOOD_FILL_CONSTANTS)

	Floodfillsurface: INTEGER_32 = 1
			-- (from WEL_FLOOD_FILL_CONSTANTS)

	floor (v: REAL_64): REAL_64
			-- Greatest integral less than or equal to v.
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	font: detachable WEL_FONT
			-- Current font selected.
			-- (from WEL_DC)

	generating_type: TYPE [detachable EV_MODEL_PRINT_PROJECTOR_IMP]
			-- Type of current object
			-- (type of which it is a direct instance)
			-- (from ANY)
		ensure -- from ANY
			generating_type_not_void: Result /= Void

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)
		ensure -- from ANY
			generator_not_void: Result /= Void
			generator_not_empty: not Result.is_empty

	frozen Halftone: INTEGER_32 = 4
			-- Maps pixels from the source rectangle into blocks of pixels in the
			-- destination rectangle. The average color over the destination block
			-- of pixels approximates the color of the source pixels.
			-- After setting the HALFTONE stretching mode, an application must call the
			-- SetBrushOrgEx function to set the brush origin. If it fails to do so,
			-- brush misalignment occurs.
			-- Was declared in {WEL_STRETCH_MODE_CONSTANTS} as synonym of `stretch_halftone`.
			-- (from WEL_STRETCH_MODE_CONSTANTS)

	Horizontal_resolution: INTEGER_32 = 8
			-- Width of the display, in pixels
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Horizontal_size: INTEGER_32 = 4
			-- Width of the physical display in millimeters
			-- (from WEL_CAPABILITIES_CONSTANTS)

	item: POINTER
			-- Generic Windows handle or structure pointer.
			-- Can be a HWND, HICON, RECT *, WNDCLASS *, etc...
			-- (from WEL_ANY)

	Line_caps: INTEGER_32 = 30
			-- See class WEL_LINE_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	log (v: REAL_64): REAL_64
			-- Natural logarithm of v.
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	log10 (v: REAL_64): REAL_64
			-- Base 10 logarithm of v.
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	log_2 (v: REAL_64): REAL_64
			-- Base 2 logarithm of v.
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	Logical_pixels_x: INTEGER_32 = 88
			-- Number of pixels per logical inch along
			-- the display width
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Logical_pixels_y: INTEGER_32 = 90
			-- Number of pixels per logical inch along
			-- the display height
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Maximum_buffered_string_size: INTEGER_32 = 10000
			-- Maximum size of string permitting a shared WEL_STRING object to
			-- be returned by `wel_string_restricted`.
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)

	mm_anisotropic: INTEGER_32
			-- (from WEL_MM_CONSTANTS)

	mm_hienglish: INTEGER_32
			-- (from WEL_MM_CONSTANTS)

	mm_himetric: INTEGER_32
			-- (from WEL_MM_CONSTANTS)

	mm_isotropic: INTEGER_32
			-- (from WEL_MM_CONSTANTS)

	mm_loenglish: INTEGER_32
			-- (from WEL_MM_CONSTANTS)

	mm_lometric: INTEGER_32
			-- (from WEL_MM_CONSTANTS)

	mm_text: INTEGER_32
			-- (from WEL_MM_CONSTANTS)

	mm_twips: INTEGER_32
			-- (from WEL_MM_CONSTANTS)

	Num_brushes: INTEGER_32 = 16
			-- Number of device-specific brushes
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Num_colors: INTEGER_32 = 24
			-- Number of entries in the device's color table
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Num_fonts: INTEGER_32 = 22
			-- Number of device-specific fonts
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Num_markers: INTEGER_32 = 20
			-- Number of device-specific markers
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Num_pens: INTEGER_32 = 18
			-- Number of device-specific pens
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Num_reserved: INTEGER_32 = 106
			-- Number of reserved entries in the system palette
			-- (from WEL_CAPABILITIES_CONSTANTS)

	offset_x: INTEGER_32
			-- Everyting is drawn offset_x pixels to the right.
			-- (from EV_MODEL_DRAWER)

	offset_y: INTEGER_32
			-- Everyting is drawn offset_y pixels to bottom.
			-- (from EV_MODEL_DRAWER)

	palette: detachable WEL_PALETTE
			-- Current palette selected.
			-- (from WEL_DC)

	Pdevice_size: INTEGER_32 = 26
			-- Size of the PDEVICE internal structure, in bytes
			-- (from WEL_CAPABILITIES_CONSTANTS)

	pen: detachable WEL_PEN
			-- Current pen selected.
			-- (from WEL_DC)

	Physical_offset_x: INTEGER_32 = 112
			-- Distance from left edge of the printable area, in
			-- device units.
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Physical_offset_y: INTEGER_32 = 113
			-- Distance from top edge of the printable area, in
			-- device units.
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Pi: REAL_64 = 3.1415926535897932384626433832795029
			-- (from MATH_CONST)

	Pi_2: REAL_64 = 1.5707963267948966192313216916397514
			-- (from MATH_CONST)

	Pi_4: REAL_64 = 0.7853981633974483096156608458198757
			-- (from MATH_CONST)

	Planes: INTEGER_32 = 14
			-- Number of color planes
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Polygonal_caps: INTEGER_32 = 32
			-- See class WEL_POLYGONAL_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	project
			-- Make a standard projection of the world on the device.
		require -- from  EV_MODEL_PRINT_PROJECTOR_I
			True
		require -- from  EV_MODEL_PROJECTION_ROUTINES
			True

	Raster_caps: INTEGER_32 = 38
			-- See class WEL_RASTER_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	region: detachable WEL_REGION
			-- Current region selected.
			-- (from WEL_DC)

	Scaling_factor_x: INTEGER_32 = 114
			-- Scaling factor for the x-axis of the printer.
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Scaling_factor_y: INTEGER_32 = 115
			-- Scaling factor for the y-axis of the printer.
			-- (from WEL_CAPABILITIES_CONSTANTS)

	sine (v: REAL_64): REAL_64
			-- Trigonometric sine of radian v approximated
			-- in range [-pi/4, +pi/4].
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	Size_palette: INTEGER_32 = 104
			-- Number of entries in the system palette
			-- (from WEL_CAPABILITIES_CONSTANTS)

	sqrt (v: REAL_64): REAL_64
			-- Square root of v.
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	Sqrt2: REAL_64 = 1.4142135623730950488016887242096981
			-- Square root of 2
			-- (from MATH_CONST)

	Stretch_andscans: INTEGER_32 = 1
			-- Performs a Boolean AND operation using the color values for the eliminated
			-- and existing pixels. If the bitmap is a monochrome bitmap, this mode
			-- preserves black pixels at the expense of white pixels.
			-- Was declared in {WEL_STRETCH_MODE_CONSTANTS} as synonym of `black_on_white`.
			-- (from WEL_STRETCH_MODE_CONSTANTS)

	Stretch_deletescans: INTEGER_32 = 3
			-- Deletes the pixels. This mode deletes all eliminated lines of
			-- pixels without trying to preserve their information.
			-- Was declared in {WEL_STRETCH_MODE_CONSTANTS} as synonym of `color_on_color`.
			-- (from WEL_STRETCH_MODE_CONSTANTS)

	Stretch_halftone: INTEGER_32 = 4
			-- Maps pixels from the source rectangle into blocks of pixels in the
			-- destination rectangle. The average color over the destination block
			-- of pixels approximates the color of the source pixels.
			-- After setting the HALFTONE stretching mode, an application must call the
			-- SetBrushOrgEx function to set the brush origin. If it fails to do so,
			-- brush misalignment occurs.
			-- Was declared in {WEL_STRETCH_MODE_CONSTANTS} as synonym of `halftone`.
			-- (from WEL_STRETCH_MODE_CONSTANTS)

	Stretch_orscans: INTEGER_32 = 2
			-- Was declared in {WEL_STRETCH_MODE_CONSTANTS} as synonym of `white_on_black`.
			-- (from WEL_STRETCH_MODE_CONSTANTS)

	ta_baseline: INTEGER_32
			-- The reference point is on the base line of the text.
			-- (from WEL_TA_CONSTANTS)

	ta_bottom: INTEGER_32
			-- The reference point is on the bottom edge of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)

	ta_center: INTEGER_32
			-- The reference point is aligned horizontally with the center of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)

	ta_left: INTEGER_32
			-- The reference point is on the left edge of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)

	ta_noupdatecp: INTEGER_32
			-- The current position is not updated after each text output call.
			-- (from WEL_TA_CONSTANTS)

	ta_right: INTEGER_32
			-- The reference point is on the right edge of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)

	ta_top: INTEGER_32
			-- The reference point is on the top edge of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)

	ta_updatecp: INTEGER_32
			-- The current position is updated after each text output call.
			-- (from WEL_TA_CONSTANTS)

	tangent (v: REAL_64): REAL_64
			-- Trigonometric tangent of radian v approximated
			-- in range [-pi/4, +pi/4].
			-- (from DOUBLE_MATH)
		ensure -- from DOUBLE_MATH
			instance_free: class

	Technology: INTEGER_32 = 2
			-- Device technology.
			-- See class WEL_DEVICE_TECHNOLOGY_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Text_caps: INTEGER_32 = 34
			-- See class WEL_TEXT_CAPABILITIES_CONSTANTS
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Vertical_resolution: INTEGER_32 = 10
			-- Height of the display, in raster lines
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Vertical_size: INTEGER_32 = 6
			-- Height of the physical display in millimeters
			-- (from WEL_CAPABILITIES_CONSTANTS)

	Wel_rect: WEL_RECT
			-- Once access to an object of type WEL_RECT
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)

	Wel_string: WEL_STRING
			-- Once access to an object of type WEL_STRING
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)

	wel_string_from_string (s: READABLE_STRING_GENERAL): WEL_STRING
			-- Return a shared wel string set to s if
			-- s.count < `maximum_buffered_string_size`, otherwise
			-- return a new WEL_STRING object set to s.
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)
		require -- from WEL_SHARED_TEMPORARY_OBJECTS
			s_not_void: s /= Void

	wel_string_from_string_with_newline_conversion (s: READABLE_STRING_GENERAL): WEL_STRING
			-- Return a shared wel string set to s if
			-- s.count < `maximum_buffered_string_size`, otherwise
			-- return a new WEL_STRING object set to s.
			-- Make sure all lone '%N' characters are prepended with a carriage return '%R'.
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)
		require -- from WEL_SHARED_TEMPORARY_OBJECTS
			s_not_void: s /= Void

	wel_string_restricted (characters: INTEGER_32): WEL_STRING
			-- Return shared `wel_string` as Result if characters
			-- is less than `maximum_buffered_string_size`, otherwise return a
			-- new WEL_STRING object. This is used to prevent huge strings
			-- from being kept within a system.
			-- (from WEL_SHARED_TEMPORARY_OBJECTS)

	frozen White_on_black: INTEGER_32 = 2
			-- Was declared in {WEL_STRETCH_MODE_CONSTANTS} as synonym of `stretch_orscans`.
			-- (from WEL_STRETCH_MODE_CONSTANTS)

	winding: INTEGER_32
			-- Selects winding mode (fills any region with a
			-- nonzero winding value).
			-- (from WEL_POLYGON_FILL_MODE_CONSTANTS)

	world: EV_MODEL_WORLD
			-- Figure-world that will be projected.
			-- (from EV_MODEL_PROJECTOR)
	
feature -- Comparison

	frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void
			-- or attached to isomorphic object structures?
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			shallow_implies_deep: standard_equal (a, b) implies Result
			both_or_none_void: (a = Void) implies (Result = (b = Void))
			same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b))
			symmetric: Result implies deep_equal (b, a)

	frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached
			-- to objects considered equal?
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b))

	frozen is_deep_equal alias "≡≡≡" (other: EV_MODEL_PRINT_PROJECTOR_IMP): BOOLEAN
			-- Are Current and other attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			shallow_implies_deep: standard_is_equal (other) implies Result
			same_type: Result implies same_type (other)
			symmetric: Result implies other.is_deep_equal (Current)

	is_equal (other: EV_MODEL_PRINT_PROJECTOR_IMP): BOOLEAN
			-- Is other attached to an object considered
			-- equal to current object?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result

	frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached to
			-- field-by-field identical objects of the same type?
			-- Always uses default object comparison criterion.
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b))

	frozen standard_is_equal alias "≜" (other: EV_MODEL_PRINT_PROJECTOR_IMP): BOOLEAN
			-- Is other attached to an object of the same type
			-- as current object, and field-by-field identical to it?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
	
feature -- Status report

	background_color: WEL_COLOR_REF
			-- Current color of the background.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			result_not_void: Result /= Void

	bitmap_selected: BOOLEAN
			-- Is a bitmap selected?
			-- (from WEL_DC)

	brush_selected: BOOLEAN
			-- Is a brush selected?
			-- (from WEL_DC)

	char_abc_widths (first_char_index, last_char_index: NATURAL_32): ARRAYED_LIST [WEL_ABC_STRUCT]
			-- Result is a list of Windows ABC structures corresponding to the currently
			-- selected truetype font, with an entry for each character contained within the
			-- indices first_char_index, last_char_index.
			-- (from WEL_DC)
		require -- from WEL_DC
			indexes_valid: first_char_index >= 1 and last_char_index >= first_char_index
			valid_range: (last_char_index - first_char_index) <= {INTEGER_32}.max_value.to_natural_32
		ensure -- from WEL_DC
			result_not_void: Result /= Void

	character_size (c: CHARACTER_8): WEL_SIZE
			-- Size of the string s using the selected font.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			result_exists: Result /= Void
			positive_width: Result.width >= 0
			positive_height: Result.height >= 0

	conforms_to (other: ANY): BOOLEAN
			-- Does type of current object conform to type
			-- of other (as per Eiffel: The Language, chapter 13)?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void

	device_caps (capability: INTEGER_32): INTEGER_32
			-- Give device-specific information about
			-- the current display device.
			-- See class WEL_CAPABILITIES_CONSTANTS for
			-- capability values and results.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	exists: BOOLEAN
			-- Does the `item` exist?
			-- (from WEL_ANY)
		require -- from  WEL_REFERENCE_TRACKABLE
			True
		ensure -- from WEL_ANY
			Result = (item /= default_pointer)

	flag_set (flags, mask: INTEGER_32): BOOLEAN
			-- Is mask set in flags?
			-- (from WEL_BIT_OPERATIONS)

	font_selected: BOOLEAN
			-- Is a font selected?
			-- (from WEL_DC)

	height: INTEGER_32
			-- Height of screen (in raster lines).
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	is_destroyed: BOOLEAN
			-- Is Current no longer usable?
			-- (from EV_ANY_I)

	is_opaque: BOOLEAN
			-- Is the background mode opaque?
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	is_transparent: BOOLEAN
			-- Is the background mode transparent?
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	is_valid_file_name (a_file_name: READABLE_STRING_GENERAL): BOOLEAN
			-- Is a_file_name valid?
			-- (from WEL_DC)

	map_mode: INTEGER_32
			-- Current mapping mode
			-- See class WEL_MM_CONSTANTS for values.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			valid_map_mode: valid_map_mode_constant (Result)

	Mask_blt_supported: BOOLEAN = True
			-- It is since we only support Windows NT or greater.
			-- (from WEL_DC)

	palette_selected: BOOLEAN
			-- Is a palette selected?
			-- (from WEL_DC)

	pen_selected: BOOLEAN
			-- Is a pen selected?
			-- (from WEL_DC)

	pixel_color (x, y: INTEGER_32): WEL_COLOR_REF
			-- Color located at x, y position.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			result_not_void: Result /= Void

	polygon_fill_mode: INTEGER_32
			-- Current polygon fill mode
			-- See class WEL_POLYGON_FILL_MODE_CONSTANTS for values.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			valid_polygon_fill_mode: valid_polygon_fill_mode_constant (Result)

	position: WEL_POINT
			-- Current position in logical coordinates.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			result_exists: Result /= Void

	region_selected: BOOLEAN
			-- Is a region selected?
			-- (from WEL_DC)

	rop2: INTEGER_32
			-- Current drawing mode.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			valid_result: valid_rop2_constant (Result)

	same_type (other: ANY): BOOLEAN
			-- Is type of current object identical to type of other?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))

	shared: BOOLEAN
			-- Is `item` shared by another object?
			-- If False (by default), `item` will
			-- be destroyed by `destroy_item`.
			-- If True, `item` will not be destroyed.
			-- (from WEL_ANY)

	stretch_blt_mode: INTEGER_32
			-- Current stretching mode. The stretching mode
			-- defines how color data is added to or removed from
			-- bitmaps that are stretched or compressed when
			-- `stretch_blt` is called.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			valid_stretch_mode: valid_stretch_mode_constant (Result)

	string_height (s: READABLE_STRING_GENERAL): INTEGER_32
			-- Height of the string s using the selected font.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			s_exists: s /= Void
		ensure -- from WEL_DC
			positive_result: Result >= 0

	string_size (s: READABLE_STRING_GENERAL): WEL_SIZE
			-- Size of the string s using the selected font.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			s_exists: s /= Void
		ensure -- from WEL_DC
			result_exists: Result /= Void
			positive_width: Result.width >= 0
			positive_height: Result.height >= 0

	string_width (s: READABLE_STRING_GENERAL): INTEGER_32
			-- Width of the string s using the selected font.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			s_exists: s /= Void
		ensure -- from WEL_DC
			positive_result: Result >= 0

	tabbed_text_height (text: READABLE_STRING_GENERAL): INTEGER_32
			-- Height of a tabbed text.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			text_not_void: text /= Void
		ensure -- from WEL_DC
			positive_height: Result >= 0

	tabbed_text_size (text: READABLE_STRING_GENERAL): WEL_SIZE
			-- Size of a tabbed text.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			text_not_void: text /= Void
		ensure -- from WEL_DC
			result_not_void: Result /= Void
			positive_width: Result.width >= 0
			positive_height: Result.height >= 0

	tabbed_text_size_with_tabulation (text: READABLE_STRING_GENERAL; tabulations: ARRAY [INTEGER_32]): WEL_SIZE
			-- Size of a tabbed text, with tabulations as
			-- tabulation positions.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			text_not_void: text /= Void
			tabulations_not_void: tabulations /= Void
		ensure -- from WEL_DC
			result_not_void: Result /= Void
			positive_width: Result.width >= 0
			positive_height: Result.height >= 0

	tabbed_text_width (text: READABLE_STRING_GENERAL): INTEGER_32
			-- Width of a tabbed text.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			text_not_void: text /= Void
		ensure -- from WEL_DC
			positive_width: Result >= 0

	text_alignment: INTEGER_32
			-- Current text alignment flags.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	text_color: WEL_COLOR_REF
			-- Current color of the text.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			result_not_void: Result /= Void

	text_face: READABLE_STRING_GENERAL
			-- Typeface name of the font that is currently selected.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			result_not_void: Result /= Void

	valid_dib_colors_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid dib colors constant?
			-- (from WEL_DIB_COLORS_CONSTANTS)

	valid_extent_map_mode (mode: INTEGER_32): BOOLEAN
			-- Is mode a valid window or viewport extent map mode?
			-- (from WEL_DC)
		require -- from WEL_DC
			valid_map_mode: valid_map_mode_constant (mode)

	valid_htext_alignment_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid text alignment constant for horizontal positioning?
			-- (from WEL_TA_CONSTANTS)

	valid_map_mode_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid map mode constant?
			-- (from WEL_MM_CONSTANTS)

	valid_polygon_fill_mode_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid polygon fill mode constant?
			-- (from WEL_POLYGON_FILL_MODE_CONSTANTS)

	valid_rop2_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid rop2 constant?
			-- (from WEL_DRAWING_CONSTANTS)

	valid_stretch_mode_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid stretch mode constant?
			-- (from WEL_STRETCH_MODE_CONSTANTS)

	valid_text_alignment_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid text alignment constant?
			-- (from WEL_TA_CONSTANTS)

	valid_vtext_alignment_constant (c: INTEGER_32): BOOLEAN
			-- Is c a valid text alignment constant for vertical positioning?
			-- (from WEL_TA_CONSTANTS)

	viewport_extent: WEL_SIZE
			-- Retrieve the size of the current viewport for the dc.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			result_not_void: Result /= Void

	viewport_origin: WEL_POINT
			-- Viewport origin for the dc.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			result_not_void: Result /= Void

	width: INTEGER_32
			-- Width of the screen (in pixels).
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	window_extent: WEL_SIZE
			-- Window extent for the dc
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			result_not_void: Result /= Void

	window_origin: WEL_POINT
			-- Window origin for the dc.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			result_not_void: Result /= Void
	
feature -- Status setting

	select_bitmap (a_bitmap: WEL_BITMAP)
			-- Select the a_bitmap as the current bitmap.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_bitmap_not_void: a_bitmap /= Void
			a_bitmap_exists: a_bitmap.exists
		ensure -- from WEL_DC
			bitmap_set: bitmap = a_bitmap
			bitmap_selected: bitmap_selected

	select_brush (a_brush: WEL_BRUSH)
			-- Select the a_brush as the current brush.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_brush_not_void: a_brush /= Void
			a_brush_exists: a_brush.exists
		ensure -- from WEL_DC
			brush_set: brush = a_brush
			brush_selected: brush_selected

	select_font (a_font: WEL_FONT)
			-- Select the a_font as the current font.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_font_not_void: a_font /= Void
			a_font_exists: a_font.exists
		ensure -- from WEL_DC
			font_set: font = a_font
			font_selected: font_selected

	select_palette (a_palette: WEL_PALETTE)
			-- Select the a_palette as the current palette.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_palette_not_void: a_palette /= Void
			a_palette_exists: a_palette.exists

	select_pen (a_pen: WEL_PEN)
			-- Select the a_pen as the current pen.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_pen_not_void: a_pen /= Void
			a_pen_exists: a_pen.exists
		ensure -- from WEL_DC
			pen_set: pen = a_pen
			pen_selected: pen_selected

	select_region (a_region: WEL_REGION)
			-- Select the a_region as the current region.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_region_not_void: a_region /= Void
			a_region_exists: a_region.exists
		ensure -- from WEL_DC
			region_set: region = a_region
			region_selected: region_selected

	set_background_color (color: WEL_COLOR_REF)
			-- Set the `background_color` to color.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			color_not_void: color /= Void
		ensure -- from WEL_DC
			color_set: background_color.item = color.item

	set_background_opaque
			-- Set the background mode to opaque.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			is_opaque: is_opaque

	set_background_transparent
			-- Set the background mode to transparent.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			is_transparent: is_transparent

	set_di_bits (a_bitmap: WEL_BITMAP; start_scan, scan_lines: INTEGER_32; bits: ARRAY [CHARACTER_8]; bitmap_info: WEL_BITMAP_INFO; usage: INTEGER_32): INTEGER_32
			-- Set device-independent bits of a_bitmap.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_bitmap_not_void: a_bitmap /= Void
			a_bitmap_exists: a_bitmap.exists
			positive_start_scan: start_scan >= 0
			positive_scan_lines: scan_lines >= 0
			bits_not_void: bits /= Void
			bitmap_info_not_void: bitmap_info /= Void
			valid_usage: valid_dib_colors_constant (usage)

	set_di_bits_pointer (a_bitmap: WEL_BITMAP; start_scan, scan_lines: INTEGER_32; bits: MANAGED_POINTER; bitmap_info: WEL_BITMAP_INFO; usage: INTEGER_32): INTEGER_32
			-- Set device-independent bits of a_bitmap.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_bitmap_not_void: a_bitmap /= Void
			a_bitmap_exists: a_bitmap.exists
			positive_start_scan: start_scan >= 0
			positive_scan_lines: scan_lines >= 0
			bits_not_void: bits /= Void
			bitmap_info_not_void: bitmap_info /= Void
			valid_usage: valid_dib_colors_constant (usage)

	set_hv_text_alignment (h, v: INTEGER_32)
			-- Set the text alignment using the horizontal and
			-- vertical components in h and v.
			-- See class WEL_TA_CONSTANTS for valid alignments.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			valid_horizontal_alignment: valid_htext_alignment_constant (h)
			valid_vertical_alignment: valid_vtext_alignment_constant (v)
		ensure -- from WEL_DC
			text_alignments_set: flag_set (text_alignment, h) and flag_set (text_alignment, v)

	set_map_mode (mode: INTEGER_32)
			-- Set the mapping mode mode of the device context.
			-- See class WEL_MM_CONSTANTS for mode values.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			valid_map_mode: valid_map_mode_constant (mode)
		ensure -- from WEL_DC
			map_mode_set: map_mode = mode

	set_polygon_fill_mode (mode: INTEGER_32)
			-- Set the polygon fill mode `polygon_fill_mode` with
			-- mode.
			-- See class WEL_POLYGON_FILL_MODE_CONSTANTS for
			-- mode values.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			valid_polygon_fill_mode: valid_polygon_fill_mode_constant (mode)
		ensure -- from WEL_DC
			polygon_fill_mode_set: polygon_fill_mode = mode

	set_rop2 (a_rop2: INTEGER_32)
			-- Set the current foreground mix mode. GDI uses the
			-- foreground mix mode to combine pens and interiors of
			-- filled objects with the colors already on the screen.
			-- The foreground mix mode defines how colors from the
			-- brush or pen and the colors in the existing image
			-- are to be combined.
			-- For a_rop2 values, see class WEL_ROP2_CONSTANTS.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			valid_rop2_constant: valid_rop2_constant (a_rop2)
		ensure -- from WEL_DC
			rop2_set: rop2 = a_rop2

	set_shared
			-- Set `shared` to True.
			-- (from WEL_ANY)
		ensure -- from WEL_ANY
			shared: shared

	set_stretch_blt_mode (a_mode: INTEGER_32)
			-- Set the bitmap stretching mode with a_mode.
			-- See class WEL_STRETCH_MODE_CONSTANTS for a_mode
			-- values.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			valid_stretch_mode_constant: valid_stretch_mode_constant (a_mode)
		ensure -- from WEL_DC
			stretch_blt_mode_set: stretch_blt_mode = a_mode

	set_text_alignment (an_alignment: INTEGER_32)
			-- Set the text alignment with an_alignment.
			-- See class WEL_TA_CONSTANTS for an_alignment.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			valid_alignment: valid_text_alignment_constant (an_alignment)
		ensure -- from WEL_DC
			text_alignment_set: flag_set (text_alignment, an_alignment)

	set_text_color (color: WEL_COLOR_REF)
			-- Set the `text_color` to color.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			color_not_void: color /= Void
		ensure -- from WEL_DC
			color_set: text_color.item = color.item

	set_unshared
			-- Set `shared` to False.
			-- (from WEL_ANY)
		ensure -- from WEL_ANY
			unshared: not shared

	set_viewport_extent (x_extent, y_extent: INTEGER_32)
			-- Set the x_extent and y_extent of the viewport
			-- associated with the device context.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			valid_current_map_mode: valid_extent_map_mode (map_mode)
		ensure -- from WEL_DC
			x_viewport_extent_set: map_mode /= mm_isotropic implies viewport_extent.width = x_extent
			y_viewport_extent_set: map_mode /= mm_isotropic implies viewport_extent.height = y_extent

	set_viewport_origin (x_origin, y_origin: INTEGER_32)
			-- Set the x_origin and y_origin of the viewport
			-- associated with the device context.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			x_viewport_origin_set: viewport_origin.x = x_origin
			y_viewport_origin_set: viewport_origin.y = y_origin

	set_window_extent (x_extent, y_extent: INTEGER_32)
			-- Set the x_extent and y_extent of the window
			-- associated with the device context.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			valid_current_map_mode: valid_extent_map_mode (map_mode)
		ensure -- from WEL_DC
			x_window_extent_set: map_mode /= mm_isotropic implies window_extent.width = x_extent
			y_window_extent_set: map_mode /= mm_isotropic implies window_extent.height = y_extent

	set_window_origin (x_origin, y_origin: INTEGER_32)
			-- Set the x_origin and y_origin of the window
			-- associated with the device context
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			x_window_origin_set: window_origin.x = x_origin
			y_window_origin_set: window_origin.y = y_origin

	set_world (a_world: like world)
			-- Set `world` to a_world.
			-- (from EV_MODEL_PROJECTOR)
		require -- from EV_MODEL_PROJECTOR
			a_world_exists: a_world /= Void
		ensure -- from EV_MODEL_PROJECTOR
			world_assigned: world = a_world

	unselect_all
			-- Deselect all objects and restore the old ones.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
		ensure -- from WEL_DC
			pen_not_selected: not pen_selected
			brush_not_selected: not brush_selected
			region_not_selected: not region_selected
			palette_not_selected: not palette_selected
			font_not_selected: not font_selected
			bitmap_not_selected: not bitmap_selected

	unselect_bitmap
			-- Deselect the bitmap and restore the old one.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			bitmap_selected: bitmap_selected
		ensure -- from WEL_DC
			bitmap_not_selected: not bitmap_selected

	unselect_brush
			-- Deselect the brush and restore the old one.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			brush_selected: brush_selected
		ensure -- from WEL_DC
			brush_not_selected: not brush_selected

	unselect_font
			-- Deselect the font and restore the old one.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			font_selected: font_selected
		ensure -- from WEL_DC
			font_not_selected: not font_selected

	unselect_palette
			-- Deselect the palette and restore the old one.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			palette_selected: palette_selected
		ensure -- from WEL_DC
			palette_not_selected: not palette_selected

	unselect_pen
			-- Deselect the pen and restore the old one.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			pen_selected: pen_selected
		ensure -- from WEL_DC
			pen_not_selected: not pen_selected

	unselect_region
			-- Deselect the region and restore the old one.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			region_selected: region_selected
		ensure -- from WEL_DC
			region_not_selected: not region_selected
	
feature -- Element change

	set_item (an_item: POINTER)
			-- Set `item` with an_item
			-- (from WEL_ANY)
		ensure -- from WEL_ANY
			item_set: item = an_item
	
feature -- Removal

	delete
			-- Destroy inner structure of Current.
			-- To be called when Current is no more needed
			-- (from WEL_REFERENCE_TRACKABLE)
		require -- from WEL_REFERENCE_TRACKABLE
			reference_not_tracked: not reference_tracked
		ensure -- from WEL_REFERENCE_TRACKABLE
			destroyed: not shared implies not exists

	dispose
			-- Destroy inner structure of Current.
			-- (from WEL_REFERENCE_TRACKABLE)
		require -- from  DISPOSABLE
			True
		ensure then -- from WEL_REFERENCE_TRACKABLE
			internal_object_id_freed: internal_object_id = 0
	
feature -- Duplication

	copy (other: EV_MODEL_PRINT_PROJECTOR_IMP)
			-- Update current object using fields of object attached
			-- to other, so as to yield equal objects.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		ensure -- from ANY
			is_equal: Current ~ other

	frozen deep_copy (other: EV_MODEL_PRINT_PROJECTOR_IMP)
			-- Effect equivalent to that of:
			--		`copy` (other . `deep_twin`)
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		ensure -- from ANY
			deep_equal: deep_equal (Current, other)

	frozen deep_twin: EV_MODEL_PRINT_PROJECTOR_IMP
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)

	frozen standard_copy (other: EV_MODEL_PRINT_PROJECTOR_IMP)
			-- Copy every field of other onto corresponding field
			-- of current object.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)

	frozen standard_twin: EV_MODEL_PRINT_PROJECTOR_IMP
			-- New object field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		ensure -- from ANY
			standard_twin_not_void: Result /= Void
			equal: standard_equal (Result, Current)

	frozen twin: EV_MODEL_PRINT_PROJECTOR_IMP
			-- New object equal to Current
			-- `twin` calls `copy`; to change copying/twinning semantics, redefine `copy`.
			-- (from ANY)
		ensure -- from ANY
			twin_not_void: Result /= Void
			is_equal: Result ~ Current
	
feature -- Basic operations

	abort_document
			-- Stops the current print job and erases everything
			-- drawn since the last call to start_doc.
			-- (from WEL_PRINTER_DC)
		require -- from WEL_PRINTER_DC
			exists: exists

	alpha_blend (a_x_dest, a_y_dest, a_width, a_height: INTEGER_32; dc_source: WEL_DC; a_x_src, a_y_src, a_width_src, a_height_src: INTEGER_32; a_blend_function: WEL_BLEND_FUNCTION): BOOLEAN
			-- Per pixel alpha blend of bitmap of dc_source onto current.
			-- The source rectangle should be within the bounds of the bitmap associated with dc_source.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			dc_source_not_void: dc_source /= Void
			dc_source_exists: dc_source.exists
			dc_source_bitmap_selected: dc_source.bitmap_selected
			valid_src_top_left_coordinate: a_x_src >= 0 and a_y_src >= 0
			src_rect_in_source_dc: attached dc_source.bitmap as l_bitmap and then (l_bitmap.width >= (a_x_src + a_width_src) and l_bitmap.height >= (a_y_src + a_height_src))
			blend_function_not_void: a_blend_function /= Void
			blend_function_exists: a_blend_function.exists

	arc (left, top, right, bottom, x_start_arc, y_start_arc, x_end_arc, y_end_arc: INTEGER_32)
			-- Draw an elliptical arc into a rectangle specified
			-- by left, top and right, bottom, starting
			-- at x_start_arc, y_start_arc and ending at
			-- x_end_arc, y_end_arc.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	bit_blt (x_destination, y_destination, a_width, a_height: INTEGER_32; dc_source: WEL_DC; x_source, y_source, raster_operation: INTEGER_32)
			-- Copy a bitmap from the dc_source to
			-- the current device context, from x_source,
			-- y_source to x_destination, y_destination,
			-- using a_width and a_height with raster_operation.
			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for
			-- raster_operation values.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			positive_width: a_width >= 0
			positive_height: a_height >= 0
			dc_source_not_void: dc_source /= Void
			dc_source_exists: dc_source.exists

	chord (left, top, right, bottom, x_start_line, y_start_line, x_end_line, y_end_line: INTEGER_32)
			-- Draw a chord into a rectangle specified
			-- by left, top and right, bottom, starting
			-- at x_start_line, y_start_line and ending at
			-- x_end_line, y_end_line.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	clear_flag (flags, mask: INTEGER_32): INTEGER_32
			-- Clear the mask in flags
			-- (from WEL_BIT_OPERATIONS)
		ensure -- from WEL_BIT_OPERATIONS
			flag_unset: not flag_set (Result, mask)

	copy_dc (dc_source: WEL_DC; rect: WEL_RECT)
			-- Copy the content of rect in dc_source
			-- to the current dc.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			rect_not_void: rect /= Void
			dc_source_not_void: dc_source /= Void
			dc_source_exists: dc_source.exists

	cwin_hi_word (value: POINTER): INTEGER_32
			-- SDK HIWORD
			-- (from WEL_WORD_OPERATIONS)

	cwin_lo_word (value: POINTER): INTEGER_32
			-- SDK LOWORD
			-- (from WEL_WORD_OPERATIONS)

	cwin_make_long (low, high: INTEGER_32): POINTER
			-- SDK MAKELONG
			-- (from WEL_WORD_OPERATIONS)

	cwin_make_lparam (low, high: INTEGER_32): POINTER
			-- SKD MAKELPARAM
			-- (from WEL_WORD_OPERATIONS)

	frozen default: detachable EV_MODEL_PRINT_PROJECTOR_IMP
			-- Default value of object's type
			-- (from ANY)

	frozen default_pointer: POINTER
			-- Default value of type POINTER
			-- (Avoid the need to write p.`default` for
			-- some p of type POINTER.)
			-- (from ANY)
		ensure -- from ANY
			instance_free: class

	default_rescue
			-- Process exception for routines with no Rescue clause.
			-- (Default: do nothing.)
			-- (from ANY)

	di_bits (a_bitmap: WEL_BITMAP; start_scan, scan_lines: INTEGER_32; bitmap_info: WEL_BITMAP_INFO; usage: INTEGER_32): ARRAY [CHARACTER_8]
			-- Device-independent bits of a_bitmap.
			-- start_scan specifies the first scan line to
			-- retrieve and scan_lines specifies the number of
			-- scan lines to retrieve. bitmap_info specifies the
			-- desired format for the dib data.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_bitmap_not_void: a_bitmap /= Void
			a_bitmap_exists: a_bitmap.exists
			positive_start_scan: start_scan >= 0
			positive_scan_lines: scan_lines >= 0
			bitmap_info_not_void: bitmap_info /= Void
			valid_usage: valid_dib_colors_constant (usage)
		ensure -- from WEL_DC
			result_not_void: Result /= Void
			consistent_count: Result.count = bitmap_info.header.size_image

	di_bits_pointer (a_bitmap: WEL_BITMAP; start_scan, scan_lines: INTEGER_32; bitmap_info: WEL_BITMAP_INFO; usage: INTEGER_32): MANAGED_POINTER
			-- Device-independent bits of a_bitmap.
			-- start_scan specifies the first scan line to
			-- retrieve and scan_lines specifies the number of
			-- scan lines to retrieve. bitmap_info specifies the
			-- desired format for the dib data.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_bitmap_not_void: a_bitmap /= Void
			a_bitmap_exists: a_bitmap.exists
			positive_start_scan: start_scan >= 0
			positive_scan_lines: scan_lines >= 0
			bitmap_info_not_void: bitmap_info /= Void
			valid_usage: valid_dib_colors_constant (usage)
		ensure -- from WEL_DC
			result_not_void: Result /= Void
			consistent_count: Result.count = bitmap_info.header.size_image

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
		ensure -- from ANY
			instance_free: class

	draw_bitmap (a_bitmap: WEL_BITMAP; x, y, a_width, a_height: INTEGER_32)
			-- Draw `bitmap` at the x, y position
			-- using a_width and a_height.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_bitmap_not_void: a_bitmap /= Void
			a_bitmap_exists: a_bitmap.exists

	draw_bitmap_with_raster_operation (a_bitmap: WEL_BITMAP; x, y, a_width, a_height, raster_operation: INTEGER_32)
			-- Draw `bitmap` using raster_operation at position x, y
			-- using a_width and a_height.
			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for raster_operation values.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_bitmap_not_void: a_bitmap /= Void
			a_bitmap_exists: a_bitmap.exists

	draw_centered_text (string: READABLE_STRING_GENERAL; rect: WEL_RECT)
			-- Draw the text string centered in rect.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			string_not_void: string /= Void
			rect_not_void: rect /= Void

	draw_cursor (cursor: WEL_CURSOR; x, y: INTEGER_32)
			-- Draw cursor at the x, y position.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			cursor_not_void: cursor /= Void
			cursor_exists: cursor.exists

	draw_disabled_text (string: READABLE_STRING_GENERAL; rect: WEL_RECT; format: INTEGER_32)
			-- Draw the text string in disabled mode inside
			-- the rect using format
			-- See class WEL_DT_CONSTANTS for format value.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			string_not_void: string /= Void
			rect_not_void: rect /= Void

	draw_edge (a_rect: WEL_RECT; edge_type: INTEGER_32; edge_border: INTEGER_32)
			-- Draw one or more edges depending on edge_type using the borders
			-- type edge_border in the bounding rectangle a_rect.
			--
			-- edge_type is a combination of the flags BDR_xxxx and EDGE_xxxx
			-- as found in WEL_DRAWING_CONSTANTS.
			--
			-- edge_type is a combination of the flags BF_xxxx and EDGE_xxxx
			-- as found in WEL_DRAWING_CONSTANTS.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			valid_rect: a_rect /= Void and then a_rect.exists

	draw_frame_control (a_rect: WEL_RECT; control_type: INTEGER_32; control_state: INTEGER_32)
			-- Draws a frame control of the type control_type with the style
			-- control_state.
			--
			-- control_type is a combination of the flags DFC_xxxx
			-- as found in WEL_DRAWING_CONSTANTS.
			--
			-- control_state is a combination of the flags DFCS_xxxx
			-- as found in WEL_DRAWING_CONSTANTS.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			valid_rect: a_rect /= Void and then a_rect.exists

	draw_icon (icon: WEL_ICON; x, y: INTEGER_32)
			-- Draw icon at the x, y position.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			icon_not_void: icon /= Void
			icon_exists: icon.exists

	draw_icon_ex (icon: WEL_ICON; x, y, icon_width, icon_height, frame_index: INTEGER_32; flicker_free_background: detachable WEL_BRUSH; di_flags: INTEGER_32)
			-- Draw icon at the x, y position.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			icon_not_void: icon /= Void
			icon_exists: icon.exists

	draw_state_bitmap (a_brush: detachable WEL_BRUSH; a_bitmap: WEL_BITMAP; x, y: INTEGER_32; format: INTEGER_32)
			-- Draw the bitmap a_bitmap using format at the
			-- location (x,y) using the brush a_brush if format include `dss_mono`.
			--
			-- See class DSS_xxx and DST_xxx constants in WEL_DRAWING_CONSTANTS for
			-- format value.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_bitmap_not_void: a_bitmap /= Void

	draw_state_icon (a_brush: detachable WEL_BRUSH; an_icon: WEL_GRAPHICAL_RESOURCE; x, y: INTEGER_32; format: INTEGER_32)
			-- Draw the icon/cursor an_icon using format at the
			-- location (x,y) using the brush a_brush if format include `dss_mono`.
			--
			-- See class DSS_xxx and DST_xxx constants in WEL_DRAWING_CONSTANTS for
			-- format value.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			an_icon_not_void: an_icon /= Void

	draw_state_text (a_brush: detachable WEL_BRUSH; string: READABLE_STRING_GENERAL; x, y: INTEGER_32; format: INTEGER_32)
			-- Draw the text string using format at the
			-- location (x,y) using the brush a_brush if format include `dss_mono`.
			--
			-- See class DSS_xxx and DST_xxx constants in WEL_DRAWING_CONSTANTS for
			-- format value.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			string_not_void: string /= Void

	draw_text (string: READABLE_STRING_GENERAL; rect: WEL_RECT; format: INTEGER_32)
			-- Draw the text string inside
			-- the rect using format
			-- See class WEL_DT_CONSTANTS for format value.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			string_not_void: string /= Void
			rect_not_void: rect /= Void

	draw_text_with_result (string: READABLE_STRING_GENERAL; rect: WEL_RECT; format: INTEGER_32): INTEGER_32
			-- Draw the text string inside the rect using format.
			-- Return the height of the text drawn.
			-- See class WEL_DT_CONSTANTS for format value.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			string_not_void: string /= Void
			rect_not_void: rect /= Void

	eif_current_object_id: INTEGER_32
			-- New identifier for Current
			-- (from IDENTIFIED_ROUTINES)
		ensure -- from IDENTIFIED_ROUTINES
			eif_current_object_id: Result > 0
			inserted: eif_is_object_id_of_current (Result)

	eif_id_object (an_id: INTEGER_32): detachable ANY
			-- Object associated with an_id
			-- (from IDENTIFIED_ROUTINES)
		require -- from IDENTIFIED_ROUTINES
			an_id_non_negative: an_id >= 0
		ensure -- from IDENTIFIED_ROUTINES
			instance_free: class

	eif_is_object_id_of_current (an_id: INTEGER_32): BOOLEAN
			-- Is an_id the associated object ID of Current.
			-- (from IDENTIFIED_ROUTINES)
		require -- from IDENTIFIED_ROUTINES
			an_id_non_negative: an_id >= 0

	eif_object_id (an_object: ANY): INTEGER_32
			-- New identifier for an_object
			-- (from IDENTIFIED_ROUTINES)
		ensure -- from IDENTIFIED_ROUTINES
			instance_free: class
			eif_object_id_positive: Result > 0
			inserted: eif_id_object (Result) = an_object

	eif_object_id_free (an_id: INTEGER_32)
			-- Free the entry an_id
			-- (from IDENTIFIED_ROUTINES)
		require -- from IDENTIFIED_ROUTINES
			an_id_non_negative: an_id >= 0
		ensure -- from IDENTIFIED_ROUTINES
			instance_free: class
			removed: eif_id_object (an_id) = Void

	ellipse (left, top, right, bottom: INTEGER_32)
			-- Draw an ellipse into a rectangle specified by
			-- left, top and right, bottom.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	end_document
			-- End the job on the printer.
			-- (from WEL_PRINTER_DC)
		require -- from WEL_PRINTER_DC
			exists: exists

	end_page
			-- Informs the device that the application has
			-- finished writing to a page. This procedure is
			-- typically used to direct the device driver to
			-- advance to a new page.
			-- (from WEL_PRINTER_DC)
		require -- from WEL_PRINTER_DC
			exists: exists

	fill_rect (a_rect: WEL_RECT; a_brush: WEL_BRUSH)
			-- Fill a a_rect using a_brush.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_rect_not_void: a_rect /= Void
			a_brush_not_void: a_brush /= Void
			a_brush_exists: a_brush.exists

	fill_region (a_region: WEL_REGION; a_brush: WEL_BRUSH)
			-- Fill a_region using a_brush.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_region_not_void: a_region /= Void
			a_brush_not_void: a_brush /= Void
			a_brush_exists: a_brush.exists

	flood_fill_border (x, y: INTEGER_32; color: WEL_COLOR_REF)
			-- Fill an area which is bounded by color starting
			-- at x, y.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			color_not_void: color /= Void

	flood_fill_surface (x, y: INTEGER_32; color: WEL_COLOR_REF)
			-- Fill an area which is defined by color starting
			-- at x, y. Filling continues outward in all
			-- directions as long as the color is encountered.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			color_not_void: color /= Void

	get
			-- Get the device context
			-- (from WEL_PRINTER_DC)

	invert_rect (a_rect: WEL_RECT)
			-- Invert a_rect in a window by performing a logical
			-- NOT operation on the color values for each pixel.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_rect_not_void: a_rect /= Void

	invert_region (a_region: WEL_REGION)
			-- Invert the colors in a_region.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_region_not_void: a_region /= Void
			a_region_exists: a_region.exists

	is_projecting: BOOLEAN
			-- Is a project currently being performed?
			-- Then, do not start a new one.
			-- (from EV_MODEL_PROJECTION_ROUTINES)

	line (x1, y1, x2, y2: INTEGER_32)
			-- Draw a line from x1, y1 to x2, y2.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	line_to (x, y: INTEGER_32)
			-- Draw a line from the current position
			-- to x, y position.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	make_rop4 (fore, back: INTEGER_32): INTEGER_32
			-- Result is raster operation code corresponding to
			-- fore and back for argument raster_operation code
			-- of `mask_blt`. This corresponds to Windows macro Makerop4
			-- (from WEL_DC)

	mask_blt (x_destination, y_destination, a_width, a_height: INTEGER_32; dc_source: WEL_DC; x_source, y_source: INTEGER_32; mask_bitmap: WEL_BITMAP; x_mask, y_mask, raster_operation: INTEGER_32)
			-- Combines the color data for the source and destination bitmaps using the specified mask and raster operation.
			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for
			-- raster_operation values.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			positive_width: a_width >= 0
			positive_height: a_height >= 0
			mask_bitmap_not_void: mask_bitmap /= Void
			function_is_supported: Mask_blt_supported

	move_to (x, y: INTEGER_32)
			-- Set the current position to x, y position.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	pat_blt (x_destination, y_destination, a_width, a_height: INTEGER_32; raster_operation: INTEGER_32)
			-- Paint the rectangle specified by x_destination,
			-- y_destination, a_width, a_height using the brush
			-- that is currently selected into this device context.
			-- The brush color and the surface color or colors are
			-- combined by using the raster_operation.
			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for
			-- raster_operation values.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			positive_width: a_width >= 0
			positive_height: a_height >= 0

	pie (left, top, right, bottom, x_start_point, y_start_point, x_end_point, y_end_point: INTEGER_32)
			-- Draw a pie-shaped wedge by drawing an elliptical
			-- arc whose center and two endpoints are joined
			-- by lines. The pie is drawn into a rectangle
			-- specified by left, top and right, bottom,
			-- starting at x_start_point, y_start_point
			-- and ending at x_end_point, y_end_point.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	poly_bezier (points: ARRAY [INTEGER_32])
			-- Draw one or more Bezier curves by using the
			-- endpoints and control points specified by points.
			-- The first curve is drawn from the first point to the
			-- fourth point by using the second and third points as
			-- control points. Each subsequent curve in the sequence
			-- needs exactly three more points: the ending point of
			-- the previous curve is used as the starting point, the
			-- next two points in the sequence are control points,
			-- and the third is the ending point.
			-- The current position is neither used nor updated by
			-- this procedure.
			-- (from WEL_DC)
		require -- from WEL_DC
			points_not_void: points /= Void
			points_count_ok: points.count \\ 2 = 0

	poly_bezier_to (points: ARRAY [INTEGER_32])
			-- Draw one or more Bezier curves by using the control
			-- points specified by points. The first curve is
			-- drawn from the current position to the third point
			-- by using the first two points as control points.
			-- For each subsequent curve, the procedure needs
			-- exactly three more points, and uses the ending point
			-- of the previous curve as the starting point for the
			-- next.
			-- This procedure moves the current position to the
			-- ending point of the last Bezier curve.
			-- (from WEL_DC)
		require -- from WEL_DC
			points_not_void: points /= Void
			points_count_ok: points.count \\ 2 = 0

	polygon (points: ARRAY [INTEGER_32])
			-- Draw a polygon consisting of two or more points
			-- connected by lines.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			points_not_void: points /= Void
			points_count: points.count \\ 2 = 0

	polyline (points: ARRAY [INTEGER_32])
			-- Draws a series of line segments by connecting the
			-- points specified in points.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			points_not_void: points /= Void
			points_count: points.count \\ 2 = 0

	realize_palette
			-- Map palette entries from the current logical
			-- palette on the system palette.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			palette_selected: palette_selected

	rectangle (left, top, right, bottom: INTEGER_32)
			-- Draw a rectangle from left, top
			-- to right, bottom.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	release
			-- Release the device context
			-- (from WEL_PRINTER_DC)

	remove_clip_region
			-- Remove the current clipping region.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	round_rect (left, top, right, bottom, ellipse_width, ellipse_height: INTEGER_32)
			-- Draw a rectangle from left, top to
			-- right, bottom with rounded corners.
			-- The rounded corners are specified by the
			-- ellipse_width and ellipse_height.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists

	save_bitmap_into (a_bitmap: WEL_BITMAP; file: PATH)
			-- Save a_bitmap at the file location.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_bitmap_not_void: a_bitmap /= Void
			a_bitmap_exists: a_bitmap.exists
			file_not_void: file /= Void

	select_clip_region (a_region: WEL_REGION)
			-- Select a_region as the current clipping region.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			a_region_not_void: a_region /= Void
			a_region_exists: a_region.exists

	set_flag (flags, mask: INTEGER_32): INTEGER_32
			-- Set the mask in flags
			-- (from WEL_BIT_OPERATIONS)
		ensure -- from WEL_BIT_OPERATIONS
			flag_set: flag_set (Result, mask)

	set_pixel (x, y: INTEGER_32; color: WEL_COLOR_REF)
			-- Set the pixel at x, y position.
			-- with the color color.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			color_not_void: color /= Void

	start_document (title: READABLE_STRING_GENERAL)
			-- Start the job title on the printer.
			-- (from WEL_PRINTER_DC)
		require -- from WEL_PRINTER_DC
			exists: exists
			title_not_void: title /= Void

	start_document_info (doc_info: WEL_DOC_INFO)
			-- Start the job using information from doc_info.
			-- (from WEL_PRINTER_DC)
		require -- from WEL_PRINTER_DC
			exists: exists
			doc_info_not_void: doc_info /= Void
			doc_info_exiss: doc_info.exists

	start_page
			-- Prepare the printer driver to accept data.
			-- (from WEL_PRINTER_DC)
		require -- from WEL_PRINTER_DC
			exists: exists

	stretch_blt (x_destination, y_destination, width_destination, height_destination: INTEGER_32; dc_source: WEL_DC; x_source, y_source, width_source, height_source, raster_operation: INTEGER_32)
			-- Copy a bitmap from the dc_source to
			-- the current device context, from x_source,
			-- y_source to x_destination, y_destination,
			-- using `width` and `height` with raster_operation.
			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for
			-- raster_operation values.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			positive_width_destination: width_destination >= 0
			positive_height_destination: height_destination >= 0
			positive_width_source: width_source >= 0
			positive_height_source: height_source >= 0
			dc_source_not_void: dc_source /= Void
			dc_source_exists: dc_source.exists

	stretch_di_bits (x_destination, y_destination, a_width, a_height, x_source, y_source, dib_width, dib_height: INTEGER_32; dib: WEL_DIB; bitmap_info: WEL_BITMAP_INFO; rgb_mode, raster_operation: INTEGER_32)
			-- Copy a dib to the current device context, from
			-- x_source, y_source to x_destination,
			-- y_destination, using a_width and a_height
			-- with raster_operation and rgb_mode
			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for
			-- raster_operation values
			-- See class WEL_DIB_COLORS_CONSTANTS for
			-- rgb_mode values
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			positive_width: a_width >= 0
			positive_height: a_height >= 0
			dib_not_void: dib /= Void
			bitmap_not_void: bitmap_info /= Void
			valid_rgb_mode: valid_dib_colors_constant (rgb_mode)

	tabbed_text_out (x, y: INTEGER_32; string: READABLE_STRING_GENERAL; tabulations: ARRAY [INTEGER_32]; tabulations_origin: INTEGER_32)
			-- Write string on x and y position expanding
			-- tabs to the values specified in tabulations.
			-- tabulations_origin specifies the x-coordinate of
			-- the starting position from which tabs are expanded.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			string_not_void: string /= Void
			tabulations_not_void: tabulations /= Void

	text_out (x, y: INTEGER_32; string: READABLE_STRING_GENERAL)
			-- Write string on x and y position.
			-- (from WEL_DC)
		require -- from WEL_DC
			exists: exists
			string_not_void: string /= Void
	
feature -- Implementation

	between (n, a, b: INTEGER_32): BOOLEAN
			-- Is n a value between a and b?
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class

	Default_colors: EV_STOCK_COLORS
			-- Once access to EV_STOCK_COLORS.
			-- (from EV_MODEL_PROJECTION_ROUTINES)
		require -- from  EV_MODEL_DRAWER
			True

	delta_x (angle: REAL_64; length: INTEGER_32): INTEGER_32
			-- Get dx component of line segment with length and angle.
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class

	delta_y (angle: REAL_64; length: INTEGER_32): INTEGER_32
			-- Get dy component of line segment with length and angle.
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class

	distance (x1, y1, x2, y2: INTEGER_32): INTEGER_32
			-- Calculate distance between (x1, y1) and (x2, y2).
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class

	distance_from_line (x, y, x1, y1, x2, y2: INTEGER_32): INTEGER_32
			-- Calculate distance between (x, y) and (x1, y1)-(x2, y2).
			-- The line is considered to be infinite.
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class

	line_angle (x1, y1, x2, y2: INTEGER_32): REAL_64
			-- Return angle of line from (x1, y1) to (x2, y2) relative to world.
			-- clockwise. 0.0 is 3 o'clock.
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class

	modulo (a, b: REAL_64): REAL_64
			-- a modulo b.
			-- (from EV_MODEL_MATH)
		require -- from EV_MODEL_MATH
			divisible: b /= 0.0
		ensure -- from EV_MODEL_MATH
			instance_free: class
			in_interval: Result >= 0.0 and Result < b

	point_on_ellipse (x, y, xc, yc, r1, r2: INTEGER_32): BOOLEAN
			-- Is (x, y) inside specified ellipse?
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class

	point_on_ellipse_boundary (x, y, xc, yc, r1, r2, width: INTEGER_32): BOOLEAN
			-- Is (x, y) on specified ellipse border?
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class

	point_on_line (x, y, x1, y1, x2, y2, width: INTEGER_32): BOOLEAN
			-- Is (x, y) on line from (x2, y2) to (x1, y1) with `width`?
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class

	point_on_polygon (x, y: INTEGER_32; points: SPECIAL [EV_COORDINATE]): BOOLEAN
			-- Is (x, y) contained in polygon with points?
			-- Based on code by Hanpeter van Vliet.
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class

	point_on_rectangle (x, y, x1, y1, x2, y2: INTEGER_32): BOOLEAN
			-- Is (x, y) inside specified box?
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class

	point_on_segment (x, y, x1, y1, x2, y2, width: INTEGER_32): BOOLEAN
			-- Is (x, y) on segment [(x2, y2), (x1, y1)] with `width`?
			-- (from EV_MODEL_MATH)
		ensure -- from EV_MODEL_MATH
			instance_free: class
	
feature -- Basic Operations

	draw_grid (a_world: EV_MODEL_WORLD)
			-- Draw grid on canvas.
			-- world.point is the origin of the grid.
			-- (from EV_MODEL_DRAWER)
		require -- from  EV_MODEL_PRINT_PROJECTOR_I
			True
	
feature -- BitBlt and MaskBlt constants

	Blackness: INTEGER_32 = 66
			-- Declared in Windows as BLACKNESS
			-- (from WEL_DRAWING_CONSTANTS)

	Dstinvert: INTEGER_32 = 5570569
			-- Declared in Windows as DSTINVERT
			-- (from WEL_DRAWING_CONSTANTS)

	Maskpaint: INTEGER_32 = 2229030
			-- 0x220326
			-- (from WEL_DRAWING_CONSTANTS)

	Mergecopy: INTEGER_32 = 12583114
			-- Declared in Windows as MERGECOPY
			-- (from WEL_DRAWING_CONSTANTS)

	Mergepaint: INTEGER_32 = 12255782
			-- Declared in Windows as MERGEPAINT
			-- (from WEL_DRAWING_CONSTANTS)

	Notsrccopy: INTEGER_32 = 3342344
			-- Declared in Windows as NOTSRCCOPY
			-- (from WEL_DRAWING_CONSTANTS)

	Notsrcerase: INTEGER_32 = 1114278
			-- Declared in Windows as NOTSRCERASE
			-- (from WEL_DRAWING_CONSTANTS)

	Patcopy: INTEGER_32 = 15728673
			-- Declared in Windows as PATCOPY
			-- (from WEL_DRAWING_CONSTANTS)

	Patinvert: INTEGER_32 = 5898313
			-- Declared in Windows as PATINVERT
			-- (from WEL_DRAWING_CONSTANTS)

	Patpaint: INTEGER_32 = 16452105
			-- Declared in Windows as PATPAINT
			-- (from WEL_DRAWING_CONSTANTS)

	R2_black: INTEGER_32 = 1
			-- (from WEL_DRAWING_CONSTANTS)

	R2_copypen: INTEGER_32 = 13
			-- (from WEL_DRAWING_CONSTANTS)

	R2_masknotpen: INTEGER_32 = 3
			-- (from WEL_DRAWING_CONSTANTS)

	R2_maskpen: INTEGER_32 = 9
			-- (from WEL_DRAWING_CONSTANTS)

	R2_maskpennot: INTEGER_32 = 5
			-- (from WEL_DRAWING_CONSTANTS)

	R2_mergenotpen: INTEGER_32 = 12
			-- (from WEL_DRAWING_CONSTANTS)

	R2_mergepen: INTEGER_32 = 15
			-- (from WEL_DRAWING_CONSTANTS)

	R2_mergepennot: INTEGER_32 = 14
			-- (from WEL_DRAWING_CONSTANTS)

	R2_nop: INTEGER_32 = 11
			-- (from WEL_DRAWING_CONSTANTS)

	R2_not: INTEGER_32 = 6
			-- (from WEL_DRAWING_CONSTANTS)

	R2_notcopypen: INTEGER_32 = 4
			-- (from WEL_DRAWING_CONSTANTS)

	R2_notmaskpen: INTEGER_32 = 8
			-- (from WEL_DRAWING_CONSTANTS)

	R2_notmergepen: INTEGER_32 = 2
			-- (from WEL_DRAWING_CONSTANTS)

	R2_notxorpen: INTEGER_32 = 10
			-- (from WEL_DRAWING_CONSTANTS)

	R2_white: INTEGER_32 = 16
			-- (from WEL_DRAWING_CONSTANTS)

	R2_xorpen: INTEGER_32 = 7
			-- (from WEL_DRAWING_CONSTANTS)

	Srcand: INTEGER_32 = 8913094
			-- Declared in Windows as SRCAND
			-- (from WEL_DRAWING_CONSTANTS)

	Srccopy: INTEGER_32 = 13369376
			-- Declared in Windows as SRCCOPY
			-- (from WEL_DRAWING_CONSTANTS)

	Srcerase: INTEGER_32 = 4457256
			-- Declared in Windows as SRCERASE
			-- (from WEL_DRAWING_CONSTANTS)

	Srcinvert: INTEGER_32 = 6684742
			-- Declared in Windows as SRCINVERT
			-- (from WEL_DRAWING_CONSTANTS)

	Srcpaint: INTEGER_32 = 15597702
			-- Declared in Windows as SRCPAINT
			-- (from WEL_DRAWING_CONSTANTS)

	Whiteness: INTEGER_32 = 16711778
			-- Declared in Windows as WHITENESS
			-- (from WEL_DRAWING_CONSTANTS)
	
feature -- Conversion from Eiffel to Windows

	frozen to_lparam (i: INTEGER_32): POINTER
			-- Convert integer value i in a valid LPARAM value.
			-- (from WEL_DATA_TYPE)
		ensure -- from WEL_DATA_TYPE
			is_class: class

	frozen to_lresult (i: INTEGER_32): POINTER
			-- Convert integer value i in a valid LRESULT value.
			-- (from WEL_DATA_TYPE)
		ensure -- from WEL_DATA_TYPE
			is_class: class

	frozen to_wparam (i: INTEGER_32): POINTER
			-- Convert integer value i in a valid WPARAM value.
			-- (from WEL_DATA_TYPE)
		ensure -- from WEL_DATA_TYPE
			is_class: class
	
feature -- DrawEdge constants (BDR_xxxx, EDGE_xxxx, BF_xxxx)

	Bdr_raisedinner: INTEGER_32 = 4
			-- Declared in Windows as BDR_RAISEDINNER
			-- (from WEL_DRAWING_CONSTANTS)

	Bdr_raisedouter: INTEGER_32 = 1
			-- Declared in Windows as BDR_RAISEDOUTER
			-- (from WEL_DRAWING_CONSTANTS)

	Bdr_sunkeninner: INTEGER_32 = 8
			-- Declared in Windows as BDR_SUNKENINNER
			-- (from WEL_DRAWING_CONSTANTS)

	Bdr_sunkenouter: INTEGER_32 = 2
			-- Declared in Windows as BDR_SUNKENOUTER
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_adjust: INTEGER_32 = 8192
			-- Declared in Windows as BF_ADJUST
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_bottom: INTEGER_32 = 8
			-- Declared in Windows as BF_BOTTOM
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_bottomleft: INTEGER_32 = 9
			-- Declared in Windows as BF_BOTTOMLEFT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_bottomright: INTEGER_32 = 12
			-- Declared in Windows as BF_BOTTOMRIGHT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_diagonal: INTEGER_32 = 16
			-- Declared in Windows as BF_DIAGONAL
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_diagonal_endbottomleft: INTEGER_32 = 25
			-- Declared in Windows as BF_DIAGONAL_ENDBOTTOMLEFT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_diagonal_endbottomright: INTEGER_32 = 28
			-- Declared in Windows as BF_DIAGONAL_ENDBOTTOMRIGHT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_diagonal_endtopleft: INTEGER_32 = 19
			-- Declared in Windows as BF_DIAGONAL_ENDTOPLEFT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_diagonal_endtopright: INTEGER_32 = 22
			-- Declared in Windows as BF_DIAGONAL_ENDTOPRIGHT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_flat: INTEGER_32 = 16384
			-- Declared in Windows as BF_FLAT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_left: INTEGER_32 = 1
			-- Declared in Windows as BF_LEFT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_middle: INTEGER_32 = 2048
			-- Declared in Windows as BF_MIDDLE
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_mono: INTEGER_32 = 32768
			-- Declared in Windows as BF_MONO
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_rect: INTEGER_32 = 15
			-- Declared in Windows as BF_RECT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_right: INTEGER_32 = 4
			-- Declared in Windows as BF_RIGHT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_soft: INTEGER_32 = 4096
			-- Declared in Windows as BF_SOFT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_top: INTEGER_32 = 2
			-- Declared in Windows as BF_TOP
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_topleft: INTEGER_32 = 3
			-- Declared in Windows as BF_TOPLEFT
			-- (from WEL_DRAWING_CONSTANTS)

	Bf_topright: INTEGER_32 = 6
			-- Declared in Windows as BF_TOPRIGHT
			-- (from WEL_DRAWING_CONSTANTS)

	Edge_bump: INTEGER_32 = 9
			-- Declared in Windows as EDGE_BUMP
			-- Equivalent to `bdr_sunkeninner` | `bdr_raisedouter`
			-- (from WEL_DRAWING_CONSTANTS)

	Edge_etched: INTEGER_32 = 6
			-- Declared in Windows as EDGE_ETCHED
			-- Equivalent to `bdr_sunkenouter` | `bdr_raisedinner`
			-- (from WEL_DRAWING_CONSTANTS)

	Edge_raised: INTEGER_32 = 5
			-- Declared in Windows as EDGE_RAISED
			-- Equivalent to `bdr_raisedouter` | `bdr_raisedinner`
			-- (from WEL_DRAWING_CONSTANTS)

	Edge_sunken: INTEGER_32 = 10
			-- Declared in Windows as EDGE_SUNKEN
			-- Equivalent to `bdr_sunkeninner` | `bdr_sunkenouter`
			-- (from WEL_DRAWING_CONSTANTS)
	
feature -- DrawFrameControl constants (DFC_xxxx, DFCS_xxxx)

	Dfc_button: INTEGER_32 = 4
			-- Declared in Windows as DFC_BUTTON
			-- (from WEL_DRAWING_CONSTANTS)

	Dfc_caption: INTEGER_32 = 1
			-- Declared in Windows as DFC_CAPTION
			-- (from WEL_DRAWING_CONSTANTS)

	Dfc_menu: INTEGER_32 = 2
			-- Declared in Windows as DFC_MENU
			-- (from WEL_DRAWING_CONSTANTS)

	Dfc_popupmenu: INTEGER_32 = 5
			-- Declared in Windows as DFC_POPUPMENU
			-- (from WEL_DRAWING_CONSTANTS)

	Dfc_scroll: INTEGER_32 = 3
			-- Declared in Windows as DFC_SCROLL
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_adjustrect: INTEGER_32 = 8192
			-- Declared in Windows as DFCS_ADJUSTRECT
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_button3state: INTEGER_32 = 8
			-- Declared in Windows as DFCS_BUTTON3STATE
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_buttoncheck: INTEGER_32 = 0
			-- Declared in Windows as DFCS_BUTTONCHECK
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_buttonpush: INTEGER_32 = 16
			-- Declared in Windows as DFCS_BUTTONPUSH
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_buttonradio: INTEGER_32 = 4
			-- Declared in Windows as DFCS_BUTTONRADIO
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_buttonradioimage: INTEGER_32 = 1
			-- Declared in Windows as DFCS_BUTTONRADIOIMAGE
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_buttonradiomask: INTEGER_32 = 2
			-- Declared in Windows as DFCS_BUTTONRADIOMASK
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_captionclose: INTEGER_32 = 0
			-- Declared in Windows as DFCS_CAPTIONCLOSE
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_captionhelp: INTEGER_32 = 4
			-- Declared in Windows as DFCS_CAPTIONHELP
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_captionmax: INTEGER_32 = 2
			-- Declared in Windows as DFCS_CAPTIONMAX
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_captionmin: INTEGER_32 = 1
			-- Declared in Windows as DFCS_CAPTIONMIN
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_captionrestore: INTEGER_32 = 3
			-- Declared in Windows as DFCS_CAPTIONRESTORE
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_checked: INTEGER_32 = 1024
			-- Declared in Windows as DFCS_CHECKED
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_flat: INTEGER_32 = 16384
			-- Declared in Windows as DFCS_FLAT
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_hot: INTEGER_32 = 4096
			-- Declared in Windows as DFCS_HOT
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_inactive: INTEGER_32 = 256
			-- Declared in Windows as DFCS_INACTIVE
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_menuarrow: INTEGER_32 = 0
			-- Declared in Windows as DFCS_MENUARROW
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_menuarrowright: INTEGER_32 = 4
			-- Declared in Windows as DFCS_MENUARROWRIGHT
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_menubullet: INTEGER_32 = 2
			-- Declared in Windows as DFCS_MENUBULLET
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_menucheck: INTEGER_32 = 1
			-- Declared in Windows as DFCS_MENUCHECK
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_mono: INTEGER_32 = 32768
			-- Declared in Windows as DFCS_MONO
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_pushed: INTEGER_32 = 512
			-- Declared in Windows as DFCS_PUSHED
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_scrollcombobox: INTEGER_32 = 5
			-- Declared in Windows as DFCS_SCROLLCOMBOBOX
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_scrolldown: INTEGER_32 = 1
			-- Declared in Windows as DFCS_SCROLLDOWN
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_scrollleft: INTEGER_32 = 2
			-- Declared in Windows as DFCS_SCROLLLEFT
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_scrollright: INTEGER_32 = 3
			-- Declared in Windows as DFCS_SCROLLRIGHT
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_scrollsizegrip: INTEGER_32 = 8
			-- Declared in Windows as DFCS_SCROLLSIZEGRIP
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_scrollsizegripright: INTEGER_32 = 16
			-- Declared in Windows as DFCS_SCROLLSIZEGRIPRIGHT
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_scrollup: INTEGER_32 = 0
			-- Declared in Windows as DFCS_SCROLLUP
			-- (from WEL_DRAWING_CONSTANTS)

	Dfcs_transparent: INTEGER_32 = 2048
			-- Declared in Windows as DFCS_TRANSPARENT
			-- (from WEL_DRAWING_CONSTANTS)
	
feature -- DrawImage constants (DI_xxxx)

	Di_compat: INTEGER_32 = 4
			-- Declared in Windows as DI_COMPAT
			-- (from WEL_DRAWING_CONSTANTS)

	Di_defaultsize: INTEGER_32 = 8
			-- Declared in Windows as DI_DEFAULTSIZE
			-- (from WEL_DRAWING_CONSTANTS)

	Di_image: INTEGER_32 = 2
			-- Declared in Windows as DI_IMAGE
			-- (from WEL_DRAWING_CONSTANTS)

	Di_mask: INTEGER_32 = 1
			-- Declared in Windows as DI_MASK
			-- (from WEL_DRAWING_CONSTANTS)

	Di_normal: INTEGER_32 = 3
			-- Declared in Windows as DI_NORMAL
			-- (from WEL_DRAWING_CONSTANTS)
	
feature -- DrawState constants (DSS_xxxx, DST_xxxx)

	Dss_disabled: INTEGER_32 = 32
			-- Declared in Windows as DSS_DISABLED
			-- (from WEL_DRAWING_CONSTANTS)

	Dss_hideprefix: INTEGER_32 = 512
			-- Declared in Windows as DSS_HIDEPREFIX
			-- (from WEL_DRAWING_CONSTANTS)

	Dss_mono: INTEGER_32 = 128
			-- Declared in Windows as DSS_MONO
			-- (from WEL_DRAWING_CONSTANTS)

	Dss_normal: INTEGER_32 = 0
			-- Declared in Windows as DSS_NORMAL
			-- (from WEL_DRAWING_CONSTANTS)

	Dss_prefixonly: INTEGER_32 = 1024
			-- Declared in Windows as DSS_PREFIXONLY
			-- (from WEL_DRAWING_CONSTANTS)

	Dss_right: INTEGER_32 = 32768
			-- Declared in Windows as DSS_RIGHT
			-- (from WEL_DRAWING_CONSTANTS)

	Dss_union: INTEGER_32 = 16
			-- Declared in Windows as DSS_UNION
			-- (from WEL_DRAWING_CONSTANTS)

	Dst_bitmap: INTEGER_32 = 4
			-- Declared in Windows as DST_BITMAP
			-- (from WEL_DRAWING_CONSTANTS)

	Dst_complex: INTEGER_32 = 0
			-- Declared in Windows as DST_COMPLEX
			-- (from WEL_DRAWING_CONSTANTS)

	Dst_icon: INTEGER_32 = 3
			-- Declared in Windows as DST_ICON
			-- (from WEL_DRAWING_CONSTANTS)

	Dst_prefixtext: INTEGER_32 = 2
			-- Declared in Windows as DST_PREFIXTEXT
			-- (from WEL_DRAWING_CONSTANTS)

	Dst_text: INTEGER_32 = 1
			-- Declared in Windows as DST_TEXT
			-- (from WEL_DRAWING_CONSTANTS)
	
feature -- DrawText constants (DT_xxxx)

	Dt_bottom: INTEGER_32 = 8
			-- Declared in Windows as DT_BOTTOM
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_calcrect: INTEGER_32 = 1024
			-- Declared in Windows as DT_CALCRECT
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_center: INTEGER_32 = 1
			-- Declared in Windows as DT_CENTER
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_expandtabs: INTEGER_32 = 64
			-- Declared in Windows as DT_EXPANDTABS
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_externalleading: INTEGER_32 = 512
			-- Declared in Windows as DT_EXTERNALLEADING
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_hideprefix: INTEGER_32 = 1048576
			-- Declared in Windows as DT_HIDEPREFIX
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_internal: INTEGER_32 = 4096
			-- Declared in Windows as DT_INTERNAL
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_left: INTEGER_32 = 0
			-- Declared in Windows as DT_LEFT
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_noclip: INTEGER_32 = 256
			-- Declared in Windows as DT_NOCLIP
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_noprefix: INTEGER_32 = 2048
			-- Declared in Windows as DT_NOPREFIX
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_right: INTEGER_32 = 2
			-- Declared in Windows as DT_RIGHT
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_singleline: INTEGER_32 = 32
			-- Declared in Windows as DT_SINGLELINE
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_tabstop: INTEGER_32 = 128
			-- Declared in Windows as DT_TABSTOP
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_top: INTEGER_32 = 0
			-- Declared in Windows as DT_TOP
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_vcenter: INTEGER_32 = 4
			-- Declared in Windows as DT_VCENTER
			-- (from WEL_DRAWING_CONSTANTS)

	Dt_wordbreak: INTEGER_32 = 16
			-- Declared in Windows as DT_WORDBREAK
			-- (from WEL_DRAWING_CONSTANTS)
	
feature -- Element Change

	set_drawable (a_drawable: like drawable)
			-- Set `drawable` to a_drawable.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWER
			a_drawable_not_void: a_drawable /= Void
		ensure -- from EV_MODEL_DRAWER
			assigned: drawable = a_drawable
	
feature -- Figure drawing

	draw_figure_arc (arc: EV_MODEL_ARC)
			-- Draw standard representation of `arc` to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			arc_not_void: arc /= Void

	draw_figure_dot (dot: EV_MODEL_DOT)
			-- Draw standard representation of dot to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			dot_not_void: dot /= Void

	draw_figure_ellipse (ellipse: EV_MODEL_ELLIPSE)
			-- Draw standard representation of `ellipse` to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			ellipse_not_void: ellipse /= Void

	draw_figure_equilateral (eql: EV_MODEL_EQUILATERAL)
			-- Draw standard representation of eql to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			eql_not_void: eql /= Void

	draw_figure_line (line: EV_MODEL_LINE)
			-- Draw standard representation of `line` to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			line_not_void: line /= Void

	draw_figure_parallelogram (parallelogram: EV_MODEL_PARALLELOGRAM)
			-- Draw standad representation of parallelogram to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			parallelogram_not_void: parallelogram /= Void

	draw_figure_picture (picture: EV_MODEL_PICTURE)
			-- Draw standard representation of picture to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			picture_not_void: picture /= Void

	draw_figure_pie_slice (slice: EV_MODEL_PIE_SLICE)
			-- Draw standard representation of slice to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			slice_not_void: slice /= Void

	draw_figure_polygon (polygon: EV_MODEL_POLYGON)
			-- Draw standard representation of `polygon` to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			polygon_not_void: polygon /= Void

	draw_figure_polyline (line: EV_MODEL_POLYLINE)
			-- Draw standard representation of `polyline` to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			line_not_void: line /= Void

	draw_figure_rectangle (rectangle: EV_MODEL_RECTANGLE)
			-- Draw standard representation of `rectangle` to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			rectangle_not_void: rectangle /= Void

	draw_figure_rotated_arc (arc: EV_MODEL_ROTATED_ARC)
			-- Draw standard representation of `arc` to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			arc_not_void: arc /= Void

	draw_figure_rotated_ellipse (ellipse: EV_MODEL_ROTATED_ELLIPSE)
			-- Draw standard representation of `ellipse` to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			ellipse_not_void: ellipse /= Void

	draw_figure_rotated_pie_slice (slice: EV_MODEL_ROTATED_PIE_SLICE)
			-- Draw standard representation of slice to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			slice_not_void: slice /= Void

	draw_figure_rounded_parallelogram (f: EV_MODEL_ROUNDED_PARALLELOGRAM)
			-- Draw standart representation of f to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			parallelogram_not_void: f /= Void

	draw_figure_rounded_rectangle (f: EV_MODEL_ROUNDED_RECTANGLE)
			-- Draw standard representation of f to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			f_not_void: f /= Void

	draw_figure_star (star: EV_MODEL_STAR)
			-- Draw standard representation of star to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			star_not_void: star /= Void

	draw_figure_text (text_figure: EV_MODEL_TEXT)
			-- Draw standard representation of text_figure to canvas.
			-- (from EV_MODEL_DRAWER)
		require -- from EV_MODEL_DRAWING_ROUTINES
			text_figure_not_void: text_figure /= Void
	
feature -- MaskBlt only constants

	maskcopy: INTEGER_32
			-- (from WEL_DRAWING_CONSTANTS)
	
feature -- Output

	Io: STD_FILES
			-- Handle to standard file setup
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			io_not_void: Result /= Void

	out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		ensure -- from ANY
			out_not_void: Result /= Void

	print (o: detachable ANY)
			-- Write terse external representation of o
			-- on standard output.
			-- (from ANY)
		ensure -- from ANY
			instance_free: class

	frozen tagged_out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		ensure -- from ANY
			tagged_out_not_void: Result /= Void
	
feature -- Platform

	Operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
		ensure -- from ANY
			instance_free: class
			operating_environment_not_void: Result /= Void
	
feature -- Status Report

	reference_tracked: BOOLEAN
			-- Are number references of Current tracked?
			-- (from WEL_REFERENCE_TRACKABLE)

	references_count: INTEGER_32
			-- Number of object referring to current object.
			-- (from WEL_REFERENCE_TRACKABLE)
	
feature -- Status Setting

	decrement_reference
			-- Decrement number of references to current object.
			-- When number of references reaches zero,
			-- `delete` is called if object is not protected.
			-- (from WEL_REFERENCE_TRACKABLE)
		require -- from WEL_REFERENCE_TRACKABLE
			exists: exists
			tracking_references_started: reference_tracked

	enable_reference_tracking
			-- Set references_tracked to True.
			-- (from WEL_REFERENCE_TRACKABLE)
		require -- from WEL_REFERENCE_TRACKABLE
			exists: exists
			tracking_reference_not_started: not reference_tracked

	increment_reference
			-- Increment number of references to current object.
			-- (from WEL_REFERENCE_TRACKABLE)
		require -- from WEL_REFERENCE_TRACKABLE
			exists: exists
			tracking_references_started: reference_tracked

	object_id: INTEGER_32
			-- Runtime Id of Current.
			-- (from WEL_REFERENCE_TRACKABLE)
	
feature -- Vertical text alignement

	vta_baseline: INTEGER_32
			-- The reference point is on the base line of the text.
			-- (from WEL_TA_CONSTANTS)

	vta_center: INTEGER_32
			-- The reference point is aligned vertically with the center of the bounding rectangle.
			-- (from WEL_TA_CONSTANTS)
	
invariant
		-- from WEL_DC
	valid_background_mode: exists implies is_opaque /= is_transparent

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

		-- from EV_ANY_I
	interface_coupled: is_usable implies interface /= Void and then attached_interface.implementation = Current
	base_make_called: is_usable implies base_make_called

		-- from EV_MODEL_PROJECTOR
	world_exists: world /= Void

		-- from EV_MODEL_DRAWER
	drawable_not_void: drawable /= Void

note
	copyright: "Copyright (c) 1984-2017, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class EV_MODEL_PRINT_PROJECTOR_IMP


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