indexing
	description: "Bitmap object used for EV_PIXMAP masking"
	author: ""
	date: "$Date: 2006-05-31 17:22:35 -0700 (Wed, 31 May 2006) $"
	revision: "$Revision: 59320 $"

class interface
	EV_BITMAP

create 
	default_create
			-- Standard creation procedure.
			-- (from EV_ANY)
		require -- from  ANY
			True
		ensure then -- from EV_ANY
			is_coupled: implementation /= Void
			is_initialized: is_initialized
			default_create_called_set: default_create_called
			is_in_default_state: is_in_default_state

	make_with_size (a_width, a_height: INTEGER_32)
			-- Create with `a_width' and `a_height'.
		require
			a_width_positive: a_width > 0
			a_height_positive: a_height > 0
		ensure then
			width_assigned: width = a_width
			height_assigned: height = a_height

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: EV_RECTANGLE
			-- Rectangular area to apply clipping on.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			bridge_ok: (Result = Void) = (implementation.clip_area = Void)

	dashed_line_style: BOOLEAN
			-- Are lines drawn dashed?
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			bridge_ok: Result = implementation.dashed_line_style

	data: 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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			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: STRING_8
			-- Name of current object's generating type
			-- (type of which it is a direct instance)
			-- (from ANY)

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)

	height: INTEGER_32
			-- Vertical size in pixels.
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure then
			bridge_ok: Result = implementation.height
			positive: Result > 0

	line_width: INTEGER_32
			-- Line thickness. Default: 1.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			bridge_ok: Result = implementation.line_width

	tile: EV_PIXMAP
			-- Pixmap that is used to draw filled primitives with
			-- instead of foreground_color.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			bridge_ok: (Result = Void) = (implementation.tile = Void)

	width: INTEGER_32
			-- Horizontal size in pixels.
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure then
			bridge_ok: Result = implementation.width
			positive: Result > 0
	
feature -- Comparison

	frozen deep_equal (some: ANY; other: like arg #1): BOOLEAN
			-- Are `some' and `other' either both void
			-- or attached to isomorphic object structures?
			-- (from ANY)
		ensure -- from ANY
			shallow_implies_deep: standard_equal (some, other) implies Result
			both_or_none_void: (some = Void) implies (Result = (other = Void))
			same_type: (Result and (some /= Void)) implies some.same_type (other)
			symmetric: Result implies deep_equal (other, some)

	frozen equal (some: ANY; other: like arg #1): BOOLEAN
			-- Are `some' and `other' either both void or attached
			-- to objects considered equal?
			-- (from ANY)
		ensure -- from ANY
			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.is_equal (other))

	is_equal (other: like Current): 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.is_equal (Current)
			consistent: standard_is_equal (other) implies Result

	frozen standard_equal (some: ANY; other: like arg #1): BOOLEAN
			-- Are `some' and `other' 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
			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.standard_is_equal (other))

	frozen standard_is_equal (other: like Current): 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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			dashed_line_style_disabled: not dashed_line_style

	enable_dashed_line_style
			-- Draw lines dashed.
			-- See note at top.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			clip_area_void: clip_area = Void

	remove_clipping
			-- Do not apply any clipping.
			-- Was declared in EV_DRAWABLE as synonym of remove_clip_area.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			clip_area_void: clip_area = Void

	remove_tile
			-- Do not apply a tile when filling.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
			an_area_not_void: an_area /= Void
		ensure -- from EV_DRAWABLE
			clip_area_assigned: clip_area.is_equal (an_area)

	set_clip_region (a_region: EV_REGION)
			-- Set region which will be refreshed.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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'.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
			a_mode_valid: valid_drawing_mode (a_mode)
		ensure -- from EV_DRAWABLE
			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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
			a_width_positive_or_zero: a_width >= 0
		ensure -- from EV_DRAWABLE
			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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
			a_pixmap_not_void: a_pixmap /= Void
		ensure -- from EV_DRAWABLE
			tile_assigned: tile /= Void
	
feature -- Duplication

	copy (other: like Current)
			-- 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: is_equal (other)

	frozen deep_copy (other: like Current)
			-- 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: like Current
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		ensure -- from ANY
			deep_equal: deep_equal (Current, Result)

	frozen standard_copy (other: like Current)
			-- 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: like Current
			-- 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'
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
			area_not_void: area /= Void
		ensure -- from EV_DRAWABLE
			result_not_void: Result /= Void

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

	frozen default: like Current
			-- 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)

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

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
	
feature -- Clearing operations

	clear
			-- Erase `Current' with background_color.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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 {ANY} -- Contract support

	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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			drawing_mode_assigned: drawing_mode = drawing_mode_and

	set_copy_mode
			-- Set drawing_mode to normal.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			drawing_mode_assigned: drawing_mode = drawing_mode_copy

	set_invert_mode
			-- Set drawing_mode to bitwise invert.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			drawing_mode_assigned: drawing_mode = drawing_mode_invert

	set_or_mode
			-- Set drawing_mode to bitwise OR.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			drawing_mode_assigned: drawing_mode = drawing_mode_or

	set_xor_mode
			-- Set drawing_mode to bitwise XOR.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
		ensure -- from EV_DRAWABLE
			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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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'.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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: 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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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: 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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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').
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
			a_pixmap_not_void: a_pixmap /= Void

	draw_point (x, y: INTEGER_32)
			-- Draw point at (`x', `y').
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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'.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
			points_not_void: points /= Void

	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'.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
			a_width_positive_or_zero: a_width >= 0
			a_height_positive_or_zero: a_height >= 0

	draw_segment (x1, y1, x2, y2: INTEGER_32)
			-- Draw line segment from (`x1', `y1') to (`x2', `y2').
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed

	draw_straight_line (x1, y1, x2, y2: INTEGER_32)
			-- Draw infinite straight line through (`x1', `y1') and
			-- (`x2', `y2').
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
			points_not_equal: x1 /= x2 or y1 /= y2

	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').
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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: STRING_GENERAL)
			-- Draw `a_text' with left of baseline at (`x', `y') using font.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
			a_text_not_void: a_text /= Void

	draw_text_top_left (x, y: INTEGER_32; a_text: STRING_GENERAL)
			-- Draw `a_text' with top left corner at (`x', `y') using font.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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'.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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'.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			not_destroyed: not is_destroyed
			points_not_void: points /= Void

	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'.
			-- (from EV_DRAWABLE)
		require -- from EV_DRAWABLE
			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)

	out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- Was declared in ANY as synonym of tagged_out.
			-- (from ANY)

	print (some: ANY)
			-- Write terse external representation of `some'
			-- on standard output.
			-- (from ANY)

	frozen tagged_out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- Was declared in ANY as synonym of out.
			-- (from ANY)
	
feature -- Platform

	operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
	
feature -- Status Report

	is_destroyed: BOOLEAN
			-- Is `Current' no longer usable?
			-- (from EV_ANY)
		ensure -- from EV_ANY
			bridge_ok: Result = implementation.is_destroyed
	
feature -- Status Setting

	set_size (a_width, a_height: INTEGER_32)
			-- Assign `a_width' and `a_height' to width and `weight'.
			-- Do not stretch image.
			-- May cause cropping.
		require
			not_destroyed: not is_destroyed
			a_width_positive: a_width > 0
			a_height_positive: a_height > 0
		ensure
			width_assigned: width = a_width
			height_assigned: height = a_height
	
invariant
		-- from EV_DRAWABLE
	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 background_color /= Void
	foreground_color_not_void: is_usable implies foreground_color /= Void

		-- from EV_ANY
	is_initialized: is_initialized
	is_coupled: implementation /= Void and then implementation.interface = Current
	default_create_called: default_create_called

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

end -- class EV_BITMAP