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imagefont.hpp

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 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
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#ifndef GCN_IMAGEFONT_HPP
#define GCN_IMAGEFONT_HPP

#include <string>

#include "guichan/font.hpp"
#include "guichan/platform.hpp"
#include "guichan/rectangle.hpp"

namespace gcn
{
    class Color;
    class Graphics;
    class Image;

    /**
     * A font using an image containing the font data. It implements the font
     * class. You can use any filetype for the font data as long as it can be
     * loaded with your ImageLoader.
     *
     * This are two examples of an image containing a font.
     *  \image html imagefontexample.bmp
     *  \image html imagefontexample2.bmp
     *
     * The Image font format works like this: The first pixel, the pixal at
     * coordinate (0,0), tells which color to look for when seperating glyphs.
     * You create an image with your glyphs and simple separates them with
     * the seperation color. When you create your ImageFont you supply the
     * constructor with the glyphs present in your image. When creating an
     * ImageFont for the image data in the first example above, the following
     * constructor call would be used.
     * @code gcn::ImageFont imageFont("fixedfont_big.bmp"," abcdefghijklmno\
pqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"); @endcode
     * Noteworthy is that the first glyph actually gives the width of space.
     * Glyphs can, as seen in the second example above, be seperated with
     * horizontal lines making it possible to draw glyphs on more then one
     * line in the image. However, these vertical lines must be of one pixel
     * size!
     */
00096     class GCN_CORE_DECLSPEC ImageFont: public Font
    {
    public:

        /**
         * Constructor which takes an image file containing the font and
         * a string containing the glyphs. The glyphs in the string should
         * be in the same order as they appear in the font image.
         *
         * @param filename the filename of the image.
         * @param glyphs the glyphs found in the image.
         * @throws Exception when glyph list is incorrect or the font file is
         *                   corrupt or if no ImageLoader exists.
         */
        ImageFont(const std::string& filename, const std::string& glyphs);

        /**
         * Constructor which takes an image file containing the font and
         * two boundaries of ASCII values. The font image should include
         * all glyphs specified with the boundaries in increasing ASCII
         * order. The boundaries are inclusive.
         *
         * @param filename the filename of the image.
         * @param glyphsFrom the ASCII value of the first glyph found in the
         *                   image.
         * @param glyphsTo the ASCII value of the last glyph found in the
         *                 image.
         * @throws Exception when glyph bondaries are incorrect or the font
         *                   file is corrupt or if no ImageLoader exists.
         */
        ImageFont(const std::string& filename, unsigned char glyphsFrom=32,
                  unsigned char glyphsTo=126);

        /**
         * Destructor.
         */
        virtual ~ImageFont();

        /**
         * Draws a glyph.
         *
         * NOTE: You normally won't use this function to draw text since
         *       the Graphics class contains better functions for drawing
         *       text.
         *
         * @param graphics a graphics object to be used for drawing.
         * @param glyph a glyph to draw.
         * @param x the x coordinate where to draw the glyph.
         * @param y the y coordinate where to draw the glyph.
         * @return the width of the glyph in pixels.
         * @see Graphics
         */
        virtual int drawGlyph(Graphics* graphics, unsigned char glyph,
                              int x, int y);

        /**
         * Sets the spacing between rows in pixels.  Default is 0 pixels.
         * The spacing can be negative.
         *
         * @param spacing the spacing in pixels.
         */
        virtual void setRowSpacing(int spacing);

        /**
         * Gets the spacing between rows in pixels.
         *
         * @return the spacing.
         */
        virtual int getRowSpacing();

        /**
         * Sets the spacing between letters in pixels. Default is 0 pixels.
         * The spacing can be negative.
         *
         * @param spacing the spacing in pixels
         */
        virtual void setGlyphSpacing(int spacing);

        /**
         * Gets the spacing between letters in pixels.
         *
         * @return the spacing.
         */
        virtual int getGlyphSpacing();

        /**
         * Gets a width of a glyph.
         *
         * @param glyph the glyph which width will be returned
         * @return the width of a glyph
         */
        virtual int getWidth(unsigned char glyph) const;


        // Inherited from Font

        virtual int getWidth(const std::string& text) const;

        virtual void drawString(Graphics* graphics, const std::string& text,
                                int x, int y);

        virtual int getHeight() const;

        virtual int getStringIndexAt(const std::string& text, int x);

    protected:
        void addGlyph(unsigned char c, int &x, int &y, const Color& separator);

        Rectangle mGlyph[256];
        int mHeight;
        int mGlyphSpacing;
        int mRowSpacing;
        Image* mImage;
        std::string mFilename;
    };
}

#endif // end GCN_IMAGEFONT_HPP

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