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note description: "[ Abstraction for objects onto which graphical primitives may be applied. Note: When line style is dashed and line width is bigger than one, lines are not guaranteed to be dashed on all platforms. All drawing operations are performed in the current foreground color unless otherwise stated. i.e. clear_rectangle uses the current background color. ]" legal: "See notice at end of class." status: "See notice at end of class." keywords: "figure, primitive, drawing, line, point, ellipse" date: "$Date: 2018-11-23 03:21:48 -0900 (Fri, 23 Nov 2018) $" revision: "$Revision: 102516 $" deferred class interface EV_DRAWABLE feature -- Access background_color: EV_COLOR -- Color displayed behind foreground features. -- (from EV_COLORIZABLE) require -- from EV_COLORIZABLE not_destroyed: not is_destroyed ensure -- from EV_COLORIZABLE bridge_ok: Result.is_equal (implementation.background_color) clip_area: detachable EV_RECTANGLE -- Rectangular area to apply clipping on. require not_destroyed: not is_destroyed ensure bridge_ok: (Result = Void) = (implementation.clip_area = Void) dashed_line_style: BOOLEAN -- Are lines drawn dashed? require not_destroyed: not is_destroyed ensure bridge_ok: Result = implementation.dashed_line_style data: detachable ANY -- Arbitrary user data may be stored here. -- (from EV_ANY) drawing_mode: INTEGER_32 -- Logical operation on pixels when drawing. -- Default: drawing_mode_copy. require not_destroyed: not is_destroyed ensure bridge_ok: Result = implementation.drawing_mode font: EV_FONT -- Typeface appearance for Current. -- (from EV_FONTABLE) require -- from EV_FONTABLE not_destroyed: not is_destroyed ensure -- from EV_FONTABLE not_void: Result /= Void bridge_ok: Result.is_equal (implementation.font) foreground_color: EV_COLOR -- Color of foreground features like text. -- (from EV_COLORIZABLE) require -- from EV_COLORIZABLE not_destroyed: not is_destroyed ensure -- from EV_COLORIZABLE bridge_ok: Result.is_equal (implementation.foreground_color) generating_type: TYPE [detachable EV_DRAWABLE] -- 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 line_width: INTEGER_32 -- Line thickness. Default: 1. require not_destroyed: not is_destroyed ensure bridge_ok: Result = implementation.line_width tile: detachable EV_PIXMAP -- Pixmap that is used to draw filled primitives with -- instead of foreground_color. require not_destroyed: not is_destroyed ensure bridge_ok: (Result = Void) = (implementation.tile = Void) feature -- Measurement height: INTEGER_32 -- Vertical size in pixels. require not_destroyed: not is_destroyed width: INTEGER_32 -- Horizontal size in pixels. require not_destroyed: not is_destroyed 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 (other: EV_DRAWABLE): 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_DRAWABLE): 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 (other: EV_DRAWABLE): 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 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 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)) feature -- Status setting set_default_colors -- Set foreground and background color to their default values. -- (from EV_COLORIZABLE) require -- from EV_COLORIZABLE not_destroyed: not is_destroyed feature -- Element change disable_dashed_line_style -- Draw lines solid. require not_destroyed: not is_destroyed ensure dashed_line_style_disabled: not dashed_line_style enable_dashed_line_style -- Draw lines dashed. -- See note at top. require not_destroyed: not is_destroyed ensure dashed_line_style_enabled: dashed_line_style remove_clip_area -- Do not apply any clipping. -- Was declared in EV_DRAWABLE as synonym of remove_clipping. require not_destroyed: not is_destroyed ensure clip_area_void: clip_area = Void remove_clipping -- Do not apply any clipping. -- Was declared in EV_DRAWABLE as synonym of remove_clip_area. require not_destroyed: not is_destroyed ensure clip_area_void: clip_area = Void remove_tile -- Do not apply a tile when filling. require not_destroyed: not is_destroyed ensure tile_void: tile = Void set_background_color (a_color: like background_color) -- Assign a_color to background_color. -- (from EV_COLORIZABLE) require -- from EV_COLORIZABLE not_destroyed: not is_destroyed a_color_not_void: a_color /= Void ensure -- from EV_COLORIZABLE background_color_assigned: background_color.is_equal (a_color) set_clip_area (an_area: EV_RECTANGLE) -- Set area which will be refreshed. require not_destroyed: not is_destroyed an_area_not_void: an_area /= Void ensure clip_area_assigned: attached clip_area as l_clip_area and then l_clip_area.is_equal (an_area) set_clip_region (a_region: EV_REGION) -- Set region which will be refreshed. require not_destroyed: not is_destroyed a_region_not_void: a_region /= Void set_data (some_data: like data) -- Assign some_data to data. -- (from EV_ANY) require -- from EV_ANY not_destroyed: not is_destroyed ensure -- from EV_ANY data_assigned: data = some_data set_drawing_mode (a_mode: INTEGER_32) -- Set drawing mode to a_logical_mode. require not_destroyed: not is_destroyed a_mode_valid: valid_drawing_mode (a_mode) ensure drawing_mode_assigned: drawing_mode = a_mode set_font (a_font: EV_FONT) -- Assign a_font to font. -- (from EV_FONTABLE) require -- from EV_FONTABLE not_destroyed: not is_destroyed a_font_not_void: a_font /= Void ensure -- from EV_FONTABLE font_assigned: font.is_equal (a_font) and font /= a_font set_foreground_color (a_color: like foreground_color) -- Assign a_color to foreground_color. -- (from EV_COLORIZABLE) require -- from EV_COLORIZABLE not_destroyed: not is_destroyed a_color_not_void: a_color /= Void ensure -- from EV_COLORIZABLE foreground_color_assigned: foreground_color.is_equal (a_color) set_line_width (a_width: INTEGER_32) -- Assign a_width to line_width. -- See note at top. require not_destroyed: not is_destroyed a_width_positive_or_zero: a_width >= 0 ensure line_width_assigned: line_width = a_width set_tile (a_pixmap: EV_PIXMAP) -- Set tile used to fill figures. -- Set to Void to use background_color to fill. require not_destroyed: not is_destroyed a_pixmap_not_void: a_pixmap /= Void ensure tile_assigned: tile /= Void feature -- Duplication copy (other: EV_DRAWABLE) -- Update current object using fields of object attached -- to other, so as to yield equal objects. -- (from EV_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_DRAWABLE) -- 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_DRAWABLE -- 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_DRAWABLE) -- 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_DRAWABLE -- 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) sub_pixmap (area: EV_RECTANGLE): EV_PIXMAP -- Return a pixmap region of Current represented by rectangle area require not_destroyed: not is_destroyed area_not_void: area /= Void ensure result_not_void: Result /= Void frozen twin: EV_DRAWABLE -- 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 frozen default: detachable EV_DRAWABLE -- 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) frozen do_nothing -- Execute a null action. -- (from ANY) ensure -- from ANY instance_free: class feature -- Clearing operations clear -- Erase Current with background_color. require not_destroyed: not is_destroyed clear_rectangle (x, y, a_width, a_height: INTEGER_32) -- Draw rectangle with upper-left corner on (x, y) -- with size a_width and a_height in background_color. require not_destroyed: not is_destroyed a_width_positive_or_zero: a_width >= 0 a_height_positive_or_zero: a_height >= 0 feature -- Command destroy -- Destroy underlying native toolkit object. -- Render Current unusable. -- (from EV_ANY) ensure -- from EV_ANY is_destroyed: is_destroyed feature -- Constants Drawing_mode_and: INTEGER_32 = 3 -- Drawing mode where bitwise AND is performed when a -- pixel is drawn. -- -- T\S | 0 | 1 | -- ------------- --   0 | 0 | 0 | -- ------------- --   1 | 0 | 1 | -- (from EV_DRAWABLE_CONSTANTS) Drawing_mode_copy: INTEGER_32 = 0 -- Normal drawing mode. -- -- T\S | 0 | 1 | -- ------------- --   0 | 0 | 1 | -- ------------- --   1 | 0 | 1 | -- (from EV_DRAWABLE_CONSTANTS) Drawing_mode_invert: INTEGER_32 = 2 -- Drawing mode where bits are inverted before drawn. -- -- T\S | 0 | 1 | -- ------------- --   0 | 1 | 0 | -- ------------- --   1 | 1 | 0 | -- (from EV_DRAWABLE_CONSTANTS) Drawing_mode_or: INTEGER_32 = 4 -- Drawing mode where bitwise OR is performed when a -- pixel is drawn. -- -- T\S | 0 | 1 | -- ------------- --   0 | 0 | 1 | -- ------------- --   1 | 1 | 1 | -- (from EV_DRAWABLE_CONSTANTS) Drawing_mode_xor: INTEGER_32 = 1 -- Drawing mode where bitwise XOR is performed when a -- pixel is drawn. -- -- T\S | 0 | 1 | -- ------------- --   0 | 0 | 1 | -- ------------- --   1 | 1 | 0 | -- (from EV_DRAWABLE_CONSTANTS) feature -- Contract support is_background_color_void: BOOLEAN -- If background_color void? -- (from EV_COLORIZABLE) is_foreground_color_void: BOOLEAN -- If foreground_color void? -- (from EV_COLORIZABLE) valid_drawing_mode (a_mode: INTEGER_32): BOOLEAN -- Is a_mode a valid drawing mode? -- (from EV_DRAWABLE_CONSTANTS) feature -- Drawing mode setting set_and_mode -- Set drawing_mode to bitwise AND. require not_destroyed: not is_destroyed ensure drawing_mode_assigned: drawing_mode = Drawing_mode_and set_anti_aliasing (value: BOOLEAN) -- Enable (if value) or disable (if not value) anti-aliasing (if supported) when drawing. set_copy_mode -- Set drawing_mode to normal. require not_destroyed: not is_destroyed ensure drawing_mode_assigned: drawing_mode = Drawing_mode_copy set_invert_mode -- Set drawing_mode to bitwise invert. require not_destroyed: not is_destroyed ensure drawing_mode_assigned: drawing_mode = Drawing_mode_invert set_or_mode -- Set drawing_mode to bitwise OR. require not_destroyed: not is_destroyed ensure drawing_mode_assigned: drawing_mode = Drawing_mode_or set_xor_mode -- Set drawing_mode to bitwise XOR. require not_destroyed: not is_destroyed ensure drawing_mode_assigned: drawing_mode = Drawing_mode_xor feature -- Drawing operations draw_arc (x, y, a_bounding_width, a_bounding_height: INTEGER_32; a_start_angle, an_aperture: REAL_32) -- Draw part of an ellipse defined by a rectangular area with an -- upper left corner at x,y, width a_bounding_width and height -- a_bounding_height. -- Start at a_start_angle and stop at a_start_angle + an_aperture. -- Angles are measured in radians, and go -- counterclockwise from the 3 o'clock angle. require not_destroyed: not is_destroyed a_bounding_width_positive_or_zero: a_bounding_width >= 0 a_bounding_height_positive_or_zero: a_bounding_width >= 0 draw_ellipse (x, y, a_bounding_width, a_bounding_height: INTEGER_32) -- Draw an ellipse defined by a rectangular area with an -- upper left corner at x,y, width a_bounding_width and height -- a_bounding_height. require not_destroyed: not is_destroyed a_bounding_width_positive_or_zero: a_bounding_width >= 0 a_bounding_height_positive_or_zero: a_bounding_height >= 0 draw_ellipsed_text (x, y: INTEGER_32; a_text: READABLE_STRING_GENERAL; clipping_width: INTEGER_32) -- Draw a_text with left of baseline at (x, y) using font. -- Text is clipped to clipping_width in pixels and ellipses are displayed -- to show truncated characters if any. require not_destroyed: not is_destroyed a_text_not_void: a_text /= Void clipping_width_positive: clipping_width >= 0 draw_ellipsed_text_top_left (x, y: INTEGER_32; a_text: READABLE_STRING_GENERAL; clipping_width: INTEGER_32) -- Draw a_text with top left corner at (x, y) using font. -- Text is clipped to clipping_width in pixels and ellipses are displayed -- to show truncated characters if any. require not_destroyed: not is_destroyed a_text_not_void: a_text /= Void clipping_width_positive: clipping_width >= 0 draw_pie_slice (x, y, a_bounding_width, a_bounding_height: INTEGER_32; a_start_angle, an_aperture: REAL_32) -- Draw part of an ellipse defined by a rectangular area with an -- upper left corner at x,y, width a_bounding_width and height -- a_bounding_height. -- Start at a_start_angle and stop at a_start_angle + an_aperture. -- The arc is then closed by two segments through (x, 'y'). -- Angles are measured in radians, start at the -- 3 o'clock angle and grow counterclockwise. require not_destroyed: not is_destroyed a_bounding_width_positive_or_zero: a_bounding_width >= 0 a_bounding_height_positive_or_zero: a_bounding_height >= 0 draw_pixmap (x, y: INTEGER_32; a_pixmap: EV_PIXMAP) -- Draw a_pixmap with upper-left corner on (x, y). require not_destroyed: not is_destroyed a_pixmap_not_void: a_pixmap /= Void draw_point (x, y: INTEGER_32) -- Draw point at (x, y). require not_destroyed: not is_destroyed draw_polyline (points: ARRAY [EV_COORDINATE]; is_closed: BOOLEAN) -- Draw line segments between subsequent points in -- points. If is_closed draw line segment between first -- and last point in points. require not_destroyed: not is_destroyed points_not_void: points /= Void points_contains_first_and_last: points.count >= 2 draw_rectangle (x, y, a_width, a_height: INTEGER_32) -- Draw rectangle with upper-left corner on (x, y) -- with size a_width and a_height. require not_destroyed: not is_destroyed a_width_positive_or_zero: a_width >= 0 a_height_positive_or_zero: a_height >= 0 draw_rotated_text (x, y: INTEGER_32; angle: REAL_32; a_text: READABLE_STRING_GENERAL) -- Draw rotated text a_text with left of baseline at (x, y) using font. -- Rotation is number of angle radians counter-clockwise from horizontal plane. require not_destroyed: not is_destroyed a_text_not_void: a_text /= Void draw_segment (x1, y1, x2, y2: INTEGER_32) -- Draw line segment from (x1, y1) to (x2, y2). require not_destroyed: not is_destroyed draw_straight_line (x1, y1, x2, y2: INTEGER_32) -- Draw infinite straight line through (x1, y1) and -- (x2, y2). require not_destroyed: not is_destroyed points_not_equal: x1 /= x2 or y1 /= y2 draw_sub_pixel_buffer (x, y: INTEGER_32; a_pixel_buffer: EV_PIXEL_BUFFER; area: EV_RECTANGLE) -- Draw area of a_pixel_buffer with upper-left corner on (x', y). require not_destroyed: not is_destroyed a_pixel_buffer_not_void: a_pixel_buffer /= Void area_not_void: area /= Void draw_sub_pixmap (x, y: INTEGER_32; a_pixmap: EV_PIXMAP; area: EV_RECTANGLE) -- Draw area of a_pixmap with upper-left corner on (x, y). require not_destroyed: not is_destroyed a_pixmap_not_void: a_pixmap /= Void area_not_void: area /= Void draw_text (x, y: INTEGER_32; a_text: READABLE_STRING_GENERAL) -- Draw a_text with left of baseline at (x, y) using font. require not_destroyed: not is_destroyed a_text_not_void: a_text /= Void draw_text_top_left (x, y: INTEGER_32; a_text: READABLE_STRING_GENERAL) -- Draw a_text with top left corner at (x, y) using font. require not_destroyed: not is_destroyed a_text_not_void: a_text /= Void feature -- Drawing operations (filled) fill_ellipse (x, y, a_bounding_width, a_bounding_height: INTEGER_32) -- Fill an ellipse defined by a rectangular area with an -- upper left corner at x,y, width a_bounding_width and height -- a_bounding_height. require not_destroyed: not is_destroyed a_bounding_width_positive_or_zero: a_bounding_width >= 0 a_bounding_height_positive_or_zero: a_bounding_height >= 0 fill_pie_slice (x, y, a_bounding_width, a_bounding_height: INTEGER_32; a_start_angle, an_aperture: REAL_32) -- Fill part of an ellipse defined by a rectangular area with an -- upper left corner at x,y, width a_bounding_width and height -- a_bounding_height. -- Start at a_start_angle and stop at a_start_angle + an_aperture. -- The arc is then closed by two segments through (x, y). -- Angles are measured in radians, start at the 3 -- o'clock angle and grow counterclockwise. require not_destroyed: not is_destroyed a_bounding_width_positive_or_zero: a_bounding_width >= 0 a_bounding_height_positive_or_zero: a_bounding_height >= 0 fill_polygon (points: ARRAY [EV_COORDINATE]) -- Draw filled polygon between subsequent points in points. require not_destroyed: not is_destroyed points_not_void: points /= Void points_contains_first_and_last: points.count >= 2 fill_rectangle (x, y, a_width, a_height: INTEGER_32) -- Draw filled rectangle with upper-left corner on (x, y) -- with size a_width and a_height. require not_destroyed: not is_destroyed a_width_positive_or_zero: a_width >= 0 a_height_positive_or_zero: a_height >= 0 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 is_destroyed: BOOLEAN -- Is Current no longer usable? -- (from EV_ANY) ensure -- from EV_ANY bridge_ok: Result = implementation.is_destroyed invariant line_width_positive_or_zero: is_usable implies line_width >= 0 drawing_mode_valid: is_usable implies valid_drawing_mode (drawing_mode) -- from EV_COLORIZABLE background_color_not_void: is_usable implies not is_background_color_void foreground_color_not_void: is_usable implies not is_foreground_color_void -- from EV_ANY is_initialized: is_initialized default_create_called: default_create_called is_coupled: default_create_called implies (implementation.interface = Current or (attached {EV_ENVIRONMENT} Current and then attached implementation.interface)) -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) note copyright: "Copyright (c) 1984-2018, 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_DRAWABLE
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