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note description: "Defines the coordinates of the upper-left and lower-right corners of a rectangle." legal: "See notice at end of class." status: "See notice at end of class." date: "$Date: 2009-03-23 12:11:05 -0800 (Mon, 23 Mar 2009) $" revision: "$Revision: 77858 $" class interface WEL_RECT create make (a_left, a_top, a_right, a_bottom: INTEGER_32) -- Make a rectangle and set left, top, -- right, bottom with a_left, a_top, -- a_right, a_bottom ensure left_set: left = a_left top_set: top = a_top right_set: right = a_right bottom_set: bottom = a_bottom make_by_pointer (a_pointer: POINTER) -- Set item with a_pointer. -- Since item is shared, it does not need -- to be freed. -- Caution: a_pointer must be a pointer -- coming from Windows. -- (from WEL_ANY) ensure -- from WEL_ANY item_set: item = a_pointer shared: shared make_client (window: WEL_WINDOW) -- Make a client rectangle with window require window_not_void: window /= Void window_exists: window.exists ensure left_equal_zero: left = 0 top_equal_zero: top = 0 client_rect_set: is_equal (window.client_rect) make_window (window: WEL_WINDOW) -- Make a window rectangle with window -- (absolute position) require window_not_void: window /= Void window_exists: window.exists ensure window_rect_set: is_equal (window.window_rect) make_client_from_pointer (a_hwnd: POINTER) -- Make a client rectangle with a_hwnd require hwnd_valid: a_hwnd /= default_pointer ensure left_equal_zero: left = 0 top_equal_zero: top = 0 make_window_from_pointer (a_hwnd: POINTER) -- Make a window rectangle with window -- (absolute position) require hwnd_valid: a_hwnd /= default_pointer feature -- Access bottom: INTEGER_32 -- Position of the bottom border require exists: exists generating_type: TYPE [detachable WEL_RECT] -- 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 height: INTEGER_32 -- Height of current rect require exists: exists item: POINTER -- Generic Windows handle or structure pointer. -- Can be a HWND, HICON, RECT *, WNDCLASS *, etc... -- (from WEL_ANY) left: INTEGER_32 -- Position of the left border -- Was declared in WEL_RECT as synonym of x. require exists: exists right: INTEGER_32 -- Position of the right border require exists: exists top: INTEGER_32 -- Position of the top border -- Was declared in WEL_RECT as synonym of y. require exists: exists width: INTEGER_32 -- Width of current rect require exists: exists x: INTEGER_32 -- Position of the left border -- Was declared in WEL_RECT as synonym of left. require exists: exists y: INTEGER_32 -- Position of the top border -- Was declared in WEL_RECT as synonym of top. require exists: exists feature -- Measurement Structure_size: INTEGER_32 -- Size to allocate (in bytes) ensure -- from WEL_STRUCTURE positive_result: Result > 0 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: WEL_RECT): 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: like Current): BOOLEAN -- Is Current equal to other? 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: WEL_RECT): 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 empty: BOOLEAN -- Is it empty? -- A rectangle is empty if the coordinate of the right -- side is less than or equal to the coordinate -- of the left side, or the coordinate of the bottom -- side is less than or equal to the coordinate of -- the top side. require exists: exists exists: BOOLEAN -- Does the item exist? -- (from WEL_ANY) ensure -- from WEL_ANY Result = (item /= default_pointer) point_in (point: WEL_POINT): BOOLEAN -- Is point in the rectangle? require exists: exists point_not_void: point /= Void point_exists: point.exists 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) feature -- Status setting set_shared -- Set shared to True. -- (from WEL_ANY) ensure -- from WEL_ANY shared: shared set_unshared -- Set shared to False. -- (from WEL_ANY) ensure -- from WEL_ANY unshared: not shared feature -- Element change set_bottom (a_bottom: INTEGER_32) -- Set bottom with a_bottom require exists: exists ensure bottom_set: bottom = a_bottom set_item (an_item: POINTER) -- Set item with an_item -- (from WEL_ANY) ensure -- from WEL_ANY item_set: item = an_item set_left (a_left: INTEGER_32) -- Set left with a_left require exists: exists ensure left_set: left = a_left set_rect (a_left, a_top, a_right, a_bottom: INTEGER_32) -- Quick set of left, top, right, bottom -- with a_left, a_top, a_right, a_bottom -- respectively. require exists: exists ensure left_set: left = a_left top_set: top = a_top right_set: right = a_right bottom_set: bottom = a_bottom set_right (a_right: INTEGER_32) -- Set right with a_right require exists: exists ensure right_set: right = a_right set_top (a_top: INTEGER_32) -- Set top with a_top require exists: exists ensure top_set: top = a_top feature -- Removal dispose -- Destroy the inner structure of Current. -- -- This function should be called by the GC when the -- object is collected or by the user if Current is -- no more usefull. -- (from WEL_ANY) feature -- Duplication frozen deep_copy (other: WEL_RECT) -- 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: WEL_RECT -- 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: WEL_RECT) -- 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: WEL_RECT -- 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: WEL_RECT -- 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 copy (other: WEL_RECT) -- Update current object using fields of object attached -- to other, so as to yield equal objects. -- (from WEL_STRUCTURE) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_equal: Current ~ other frozen default: detachable WEL_RECT -- 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 inflate (a_x, a_y: INTEGER_32) -- Inflate the rectangle by a_x and a_y. -- Positive values increase the width and height, -- and negative values decrease them. require exists: exists ensure left_set: left = old left - a_x top_set: top = old top - a_x right_set: right = old right + a_y bottom_set: bottom = old bottom + a_y initialize -- Fill Current with zeros. -- (from WEL_STRUCTURE) require -- from WEL_STRUCTURE exists: exists initialize_with_character (a_character: CHARACTER_8) -- Fill current with a_character. -- (from WEL_STRUCTURE) require -- from WEL_STRUCTURE exists: exists intersect (rect1, rect2: WEL_RECT) -- Calculates the intersection of rect1 -- and rect2. If rect1 and rect2 do not -- intersect then empty becomes True. require exists: exists rect1_not_void: rect1 /= Void rect1_exists: rect1.exists rect2_not_void: rect2 /= Void rect2_exists: rect2.exists memory_copy (source_pointer: POINTER; length: INTEGER_32) -- Copy length bytes from source_pointer to item. -- (from WEL_STRUCTURE) require -- from WEL_STRUCTURE length_small_enough: length <= Structure_size length_large_enough: length > 0 exists: exists offset (a_x, a_y: INTEGER_32) -- Moves the rectangle by the specified -- offsets a_x and a_y. require exists: exists ensure x_set: x = old x + a_x y_set: y = old y + a_y right_set: right = old right + a_x bottom_set: bottom = old bottom + a_y subtract (rect1, rect2: WEL_RECT) -- Set the current rectangle by subtracting -- rect2 from rect1. require exists: exists rect1_not_void: rect1 /= Void rect1_exists: rect1.exists rect2_not_void: rect2 /= Void rect2_exists: rect2.exists union (rect1, rect2: WEL_RECT) -- Set the current rectangle by the smallest -- rectangle that contains both source -- rectangles rect1 and rect2. require exists: exists rect1_not_void: rect1 /= Void rect1_exists: rect1.exists rect2_not_void: rect2 /= Void rect2_exists: rect2.exists 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 invariant positive_width: exists implies width >= 0 positive_height: exists implies height >= 0 -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) note copyright: "Copyright (c) 1984-2006, Eiffel Software and others" license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)" source: "[ Eiffel Software 356 Storke Road, 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 WEL_RECT
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