color.h

Linux系统下的《红色警戒》游戏

/*      _______   __   __   __   ______   __   __   _______   __   __                 
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 *
 * Copyright (c) 2004, 2005 darkbits                        Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naess閚 a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
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#ifndef GCN_COLOR_HPP
#define GCN_COLOR_HPP

#include "guichan/platform.h"

namespace gcn
{
    /**
     * Represents a color with red, green, blue and alpha components. 
     */
    class GCN_CORE_DECLSPEC Color
    {    
    public:

        /**
         * Constructor. Initializes the color to black.
         */
        Color();
    
        /**
         * Constructs a color from the bytes in an integer. Call it with
         * a hexadecimal constant for HTML-style color representation.
         * The alpha component will be set to 255.
         *
         * EXAMPLE: Color(0xff50a0) constructs Gui-chan's favourite color. 
         *
         * NOTE: Because of this constructor, integers will be automatically casted
         *       to a color by your compiler.
         *
         * @param color the color.
         */
        Color(int color);
    
        /**
         * Constructor.
         *
         * @param r Red color component (range 0-255).
         * @param g Green color component  (range 0-255).
         * @param b Blue color component (range 0-255).
         * @param a Color alpha, used for transparency. A value of 0 means totaly
         *          transparent, 255 is totaly opaque (the default).
         */
        Color(int r, int g, int b, int a = 255);

        /**
         * Adds the RGB values of two colors together. The values will be clamped
         * if they go out of range.
         *
         * @param color a color to add to this color.
         * @return the resulting color with alpha set to 255.
         */
        Color operator+(const Color& color) const;

        /**
         * Subtracts the RGB values of one color from another.
         * The values will be clamped if they go out of range.
         *
         * @param color a color to subtract from this color.
         * @return the resulting color with alpha set to 255.
         */
        Color operator-(const Color& color) const;

        /**
         * Multiplies the RGB values of a color with a float value.
         * The values will be clamped if they go out of range.
         *
         * @param value the value to multiply the color with.
         * @return the resulting color with alpha untouched.     
         */
        Color operator*(float value) const;
    
        /**
         * Compares two colors.
         *
         * @return true if the two colors have the same RGBA components.
         */
        bool operator==(const Color& color) const;

        /**
         * Compares two colors.
         *
         * @return true if the two colors have different RGBA components.
         */
        bool operator!=(const Color& color) const;

        /**
         * Red color component (range 0-255).
         */
        int r;

        /**
         * Green color component (range 0-255).
         */
        int g;

        /**
         * Blue color component (range 0-255).
         */    
        int b;

        /**
         * Color alpha, used for transparency. A value of 0 means totaly
         * transparent, 255 is totaly opaque (the default)
         */    
        int a;    
    };  
}

#endif // end GCN_COLOR_HPP