    indexing
    	description: "Eiffel Vision color. Mswindows implementation"
    	legal: "See notice at end of class."
    	status: "See notice at end of class."
    	date: "$Date: 2006-03-22 23:29:03 -0800 (Wed, 22 Mar 2006) $"
    	revision: "$Revision: 57641 $"

    class interface
    	EV_COLOR_IMP

    create
    	make (an_interface: like interface)
    			-- Create `Current' with interface `an_interface'.
    		require -- from EV_ANY_I
    			an_interface_not_void: an_interface /= Void
    		ensure -- from EV_ANY_I
    			interface_assigned: interface = an_interface
    			base_make_called: base_make_called
    		ensure then -- from EV_COLOR_I
    			default_name_assigned: name.is_equal (default_name)
    			red_zero: red = 0
    			green_zero: green = 0
    			blue_zero: blue = 0

    feature -- Initialization

    	initialize
    			-- Initialize `Current'.
    		ensure -- from EV_ANY_I
    			is_initialized: is_initialized

    	make (an_interface: like interface)
    			-- Create `Current' with interface `an_interface'.
    		require -- from EV_ANY_I
    			an_interface_not_void: an_interface /= Void
    		ensure -- from EV_ANY_I
    			interface_assigned: interface = an_interface
    			base_make_called: base_make_called
    		ensure then -- from EV_COLOR_I
    			default_name_assigned: name.is_equal (default_name)
    			red_zero: red = 0
    			green_zero: green = 0
    			blue_zero: blue = 0

    feature -- Access

    	blue_8_bit: INTEGER_32
    			-- Intensity value for the blue component
    			-- (from WEL_COLOR_REF)
    		require -- from  EV_COLOR_I
    			True
    		ensure -- from EV_COLOR_I
    			within_range: Result >= 0 and Result <= interface.max_8_bit

    	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)

    	green_8_bit: INTEGER_32
    			-- Intensity value for the green component
    			-- (from WEL_COLOR_REF)
    		require -- from  EV_COLOR_I
    			True
    		ensure -- from EV_COLOR_I
    			within_range: Result >= 0 and Result <= interface.max_8_bit

    	item: INTEGER_32
    			-- The Current color.
    			-- (from WEL_COLOR_REF)

    	red_8_bit: INTEGER_32
    			-- Intensity value for the red component
    			-- (from WEL_COLOR_REF)
    		require -- from  EV_COLOR_I
    			True
    		ensure -- from EV_COLOR_I
    			within_range: Result >= 0 and Result <= interface.max_8_bit

    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 {ANY} -- Status report

    	valid_color_constant (c: INTEGER_32): BOOLEAN
    			-- Is `c' a valid color constant?
    			-- (from WEL_COLOR_CONSTANTS)

    feature -- Status setting

    	destroy
    			-- Render `Current' unusable.
    			-- No externals to deallocate, just set the flags.
    		ensure -- from EV_ANY_I
    			is_in_destroy_set: is_in_destroy
    			is_destroyed_set: is_destroyed

    feature -- Element change

    	wel_set_blue (a_blue: INTEGER_32)
    			-- Set blue with `a_blue'
    			-- (from WEL_COLOR_REF)
    		require -- from WEL_COLOR_REF
    			valid_blue_inf: a_blue >= 0
    			valid_blue_sup: a_blue <= 255
    		ensure -- from WEL_COLOR_REF
    			blue_set: blue_8_bit = a_blue

    	set_color (color: INTEGER_32)
    			-- Set item with `color'.
    			-- (from WEL_COLOR_REF)
    		ensure -- from WEL_COLOR_REF
    			color_set: item = color

    	wel_set_green (a_green: INTEGER_32)
    			-- Set green with `a_green'
    			-- (from WEL_COLOR_REF)
    		require -- from WEL_COLOR_REF
    			valid_green_inf: a_green >= 0
    			valid_green_sup: a_green <= 255
    		ensure -- from WEL_COLOR_REF
    			green_set: green_8_bit = a_green

    	wel_set_red (a_red: INTEGER_32)
    			-- Set red with `a_red'
    			-- (from WEL_COLOR_REF)
    		require -- from WEL_COLOR_REF
    			valid_red_inf: a_red >= 0
    			valid_red_sup: a_red <= 255
    		ensure -- from WEL_COLOR_REF
    			red_set: red_8_bit = a_red

    	set_rgb (a_red, a_green, a_blue: INTEGER_32)
    			-- Set red, green, blue with
    			-- `a_red', `a_green', `a_blue'
    			-- (from WEL_COLOR_REF)
    		require -- from WEL_COLOR_REF
    			valid_red_inf: a_red >= 0
    			valid_red_sup: a_red <= 255
    			valid_green_inf: a_green >= 0
    			valid_green_sup: a_green <= 255
    			valid_blue_inf: a_blue >= 0
    			valid_blue_sup: a_blue <= 255
    		ensure -- from WEL_COLOR_REF
    			red_set: red_8_bit = a_red
    			green_set: green_8_bit = a_green
    			blue_set: blue_8_bit = a_blue

    feature -- Duplication

    	copy (other: like Current)
    			-- 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: 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)

    	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 -- 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 --{EV_COLOR_I, EV_COLOR} -- Implementation

    	default_name: STRING_8 is "noname"
    			-- To be used as name when none is supplied.
    			-- (from EV_COLOR_I)

    	interface: EV_COLOR
    			-- Interface of the current color.
    			-- (from EV_COLOR_I)

    invariant
    		-- from EV_COLOR_I
    	red_within_range: red >= 0 and red <= 1
    	green_within_range: green >= 0 and green <= 1
    	blue_within_range: blue >= 0 and blue <= 1
    	red_8_bit_within_range: red_8_bit >= 0 and red_8_bit <= interface.max_8_bit
    	green_8_bit_within_range: green >= 0 and green_8_bit <= interface.max_8_bit
    	blue_8_bit_within_range: blue_8_bit >= 0 and blue_8_bit <= interface.max_8_bit
    	red_16_bit_within_range: red_16_bit >= 0 and red_16_bit <= interface.max_16_bit
    	green_16_bit_within_range: green_16_bit >= 0 and green_16_bit <= interface.max_16_bit
    	blue_16_bit_within_range: blue_16_bit >= 0 and blue_16_bit <= interface.max_16_bit
    	rgb_24_bit_within_range: rgb_24_bit >= 0 and rgb_24_bit <= interface.max_24_bit
    	red_16_bit_conversion: ((red * interface.max_16_bit) - red_16_bit).abs <= delta * interface.max_16_bit
    	red_8_bit_conversion: ((red * interface.max_8_bit) - red_8_bit).abs <= delta * interface.max_8_bit
    	green_16_bit_conversion: ((green * interface.max_16_bit) - green_16_bit).abs <= delta * interface.max_16_bit
    	green_8_bit_conversion: ((green * interface.max_8_bit) - green_8_bit).abs < delta * interface.max_8_bit
    	blue_16_bit_conversion: ((blue * interface.max_16_bit) - blue_16_bit).abs < delta * interface.max_16_bit
    	blue_8_bit_conversion: ((blue * interface.max_8_bit) - blue_8_bit).abs < delta * interface.max_8_bit
    	name_not_void: name /= Void

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

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

    		-- from WEL_COLOR_REF
    	valid_red_inf: red_8_bit >= 0
    	valid_red_sup: red_8_bit <= 255
    	valid_green_inf: green_8_bit >= 0
    	valid_green_sup: green_8_bit <= 255
    	valid_blue_inf: blue_8_bit >= 0
    	valid_blue_sup: blue_8_bit <= 255

    indexing
    	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 EV_COLOR_IMP