font.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
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#ifndef GCN_FONT_HPP
#define GCN_FONT_HPP

#include "guichan/graphics.h"
#include "guichan/platform.h"

namespace gcn
{
    /**
     * Holder of a font. Fonts should inherit from this class and
     * implements it's functions.
     *
     * @see ImageFont
     */
    class GCN_CORE_DECLSPEC Font
    {
    public:

        /**
         * Destructor.
         */
        virtual ~Font(){ }

        /**
         * Gets the width of a string. The width of a string is not necesserily
         * the sum of all the widths of it's glyphs. 
         *
         * @param text the string to return the width of.
         * @return the width of a string.
         */
        virtual int getWidth(const std::string& text) const = 0;

        /**
         * Gets the height of the glyphs in the font.
         *
         * @return the height of the glyphs int the font.
         */
        virtual int getHeight() const = 0;

        /**
         * Gets a string index in a string providing an x coordinate.
         * Used to retrive a string index (for a character in a
         * string) at a certain x position. It is especially useful
         * when a mouse clicks in a TextField and you want to know which
         * character was clicked.
         *
         * @return a string index in a string providing an x coordinate.
         */
        virtual int getStringIndexAt(const std::string& text, int x);
        
        /**
         * Draws a string.
         * 
         * NOTE: You normally won't use this function to draw text since
         *       Graphics contains better functions for drawing text.
         *
         * @param graphics a Graphics object to use for drawing.
         * @param text the string to draw.
         * @param x the x coordinate where to draw the string.
         * @param y the y coordinate where to draw the string.
         */
        virtual void drawString(Graphics* graphics, const std::string& text, int x, int y) = 0;    
    };  
}

#endif // end GCN_FONT_HPP