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+/* _______ __ __ __ ______ __ __ _______ __ __
+ * / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___ /\ / |\/ /\
+ * / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
+ * / / /__ / / // / // / // / / / ___ / // ___ / // /| ' / /
+ * / /_// /\ / /_// / // / // /_/_ / / // / // /\_/ / // / | / /
+ * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
+ * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
+ *
+ * Copyright (c) 2004 - 2008 Olof Naessén and Per Larsson
+ *
+ *
+ * Per Larsson a.k.a finalman
+ * Olof Naessén a.k.a jansem/yakslem
+ *
+ * Visit: http://guichan.sourceforge.net
+ *
+ * License: (BSD)
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name of Guichan nor the names of its contributors may
+ * be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GCN_GRAPHICS_HPP
+#define GCN_GRAPHICS_HPP
+
+#include <iosfwd>
+#include <stack>
+
+#include "guichan/cliprectangle.hpp"
+#include "guichan/platform.hpp"
+
+namespace gcn
+{
+ class Color;
+ class Font;
+ class Image;
+
+ /**
+ * Abstract class for providing drawing primitve functions.
+ * It contains all vital functions for drawing.
+ *
+ * Guichan contains implementations of Graphics for common
+ * libraries like the Allegro library, the HGE library,
+ * the OpenGL library, the OpenLayer library, and the SDL library.
+ * To make Guichan usable with other libraries, a Graphics class
+ * must be implemented.
+ *
+ * In Graphics you can set clip areas to limit drawing to certain
+ * areas of the screen. Clip areas are put on a stack, which
+ * means that you can push smaller and smaller clip areas onto the
+ * stack. All coordinates will be relative to the top most clip area.
+ * In most cases you won't have to worry about the clip areas,
+ * unless you want to implement some really complex widget.
+ * Pushing and poping of clip areas are handled automatically by
+ * container widgets when their child widgets are drawn.
+ *
+ * IMPORTANT: Remember to pop each clip area that you pushed on the stack
+ * after you are done with it.
+ *
+ * If you feel that Graphics is to restrictive for your needs,
+ * there is no one stopping you from using your own code for drawing
+ * in widgets. You could for instance use pure SDL in the drawing of
+ * widgets bypassing Graphics. This might however hurt portability of
+ * your application.
+ *
+ * If you implement a Graphics class not present in Guichan we would
+ * be very happy to add it to Guichan.
+ *
+ * @see AllegroGraphics, HGEGraphics, OpenLayerGraphics, OpenGLGraphics,
+ * SDLGraphics, Image
+ * @since 0.1.0
+ */
+ class GCN_CORE_DECLSPEC Graphics
+ {
+ public:
+ /**
+ * Alignments for text drawing.
+ */
+ enum Alignment
+ {
+ LEFT = 0,
+ CENTER,
+ RIGHT
+ };
+
+ /**
+ * Constructor.
+ */
+ Graphics();
+
+ /**
+ * Destructor.
+ */
+ virtual ~Graphics() { }
+
+ /**
+ * Initializes drawing. Called by the Gui when Gui::draw() is called.
+ * It is needed by some implementations of Graphics to perform
+ * preparations before drawing. An example of such an implementation
+ * is the OpenGLGraphics.
+ *
+ * NOTE: You will never need to call this function yourself, unless
+ * you use a Graphics object outside of Guichan.
+ *
+ * @see _endDraw, Gui::draw
+ */
+ virtual void _beginDraw() { }
+
+ /**
+ * Deinitializes drawing. Called by the Gui when a Gui::draw() is done.
+ * done. It should reset any state changes made by _beginDraw().
+ *
+ * NOTE: You will never need to call this function yourself, unless
+ * you use a Graphics object outside of Guichan.
+ *
+ * @see _beginDraw, Gui::draw
+ */
+ virtual void _endDraw() { }
+
+ /**
+ * Pushes a clip area onto the stack. The x and y coordinates in the
+ * rectangle is relative to the last pushed clip area.
+ * If the new area falls outside the current clip area, it will be
+ * clipped as necessary.
+ *
+ * If a clip area is outside of the top clip area a clip area with
+ * zero width and height will be pushed.
+ *
+ * @param area The clip area to be pushed onto the stack.
+ * @return False if the the new area lays outside the current clip
+ * area.
+ */
+ virtual bool pushClipArea(Rectangle area);
+
+ /**
+ * Removes the top most clip area from the stack.
+ *
+ * @throws Exception if the stack is empty.
+ */
+ virtual void popClipArea();
+
+ /**
+ * Gets the current clip area. Usefull if you want to do drawing
+ * bypassing Graphics.
+ *
+ * @return The current clip area.
+ */
+ virtual const ClipRectangle& getCurrentClipArea();
+
+ /**
+ * Draws a part of an image.
+ *
+ * NOTE: Width and height arguments will not scale the image but
+ * specifies the size of the part to be drawn. If you want
+ * to draw the whole image there is a simplified version of
+ * this function.
+ *
+ * EXAMPLE: @code drawImage(myImage, 10, 10, 20, 20, 40, 40); @endcode
+ * Will draw a rectangular piece of myImage starting at
+ * coordinate (10, 10) in myImage, with width and height 40.
+ * The piece will be drawn with it's top left corner at
+ * coordinate (20, 20).
+ *
+ * @param image The image to draw.
+ * @param srcX The source image x coordinate.
+ * @param srcY The source image y coordinate.
+ * @param dstX The destination x coordinate.
+ * @param dstY The destination y coordinate.
+ * @param width The width of the piece.
+ * @param height The height of the piece.
+ */
+ virtual void drawImage(const Image* image,
+ int srcX,
+ int srcY,
+ int dstX,
+ int dstY,
+ int width,
+ int height) = 0;
+ /**
+ * Draws an image. A simplified version of the other drawImage.
+ * It will draw a whole image at the coordinate you specify.
+ * It is equivalent to calling:
+ * @code drawImage(myImage, 0, 0, dstX, dstY, image->getWidth(), \
+ image->getHeight()); @endcode
+ */
+ virtual void drawImage(const Image* image, int dstX, int dstY);
+
+ /**
+ * Draws a single point/pixel.
+ *
+ * @param x The x coordinate.
+ * @param y The y coordinate.
+ */
+ virtual void drawPoint(int x, int y) = 0;
+
+ /**
+ * Ddraws a line.
+ *
+ * @param x1 The first x coordinate.
+ * @param y1 The first y coordinate.
+ * @param x2 The second x coordinate.
+ * @param y2 The second y coordinate.
+ */
+ virtual void drawLine(int x1, int y1, int x2, int y2) = 0;
+
+ /**
+ * Draws a simple, non-filled, rectangle with a one pixel width.
+ *
+ * @param rectangle The rectangle to draw.
+ */
+ virtual void drawRectangle(const Rectangle& rectangle) = 0;
+
+ /**
+ * Draws a filled rectangle.
+ *
+ * @param rectangle The filled rectangle to draw.
+ */
+ virtual void fillRectangle(const Rectangle& rectangle) = 0;
+
+ /**
+ * Sets the color to use when drawing.
+ *
+ * @param color A color.
+ * @see getColor
+ */
+ virtual void setColor(const Color& color) = 0;
+
+ /**
+ * Gets the color to use when drawing.
+ *
+ * @return The color used when drawing.
+ * @see setColor
+ */
+ virtual const Color& getColor() const = 0;
+
+ /**
+ * Sets the font to use when drawing text.
+ *
+ * @param font The font to use when drawing.
+ */
+ virtual void setFont(Font* font);
+
+ /**
+ * Draws text.
+ *
+ * @param text The text to draw.
+ * @param x The x coordinate where to draw the text.
+ * @param y The y coordinate where to draw the text.
+ * @param alignment The alignemnt to use when drawing.
+ * @throws Exception when no font has been set.
+ */
+ virtual void drawText(const std::string& text,
+ int x,
+ int y,
+ Alignment alignment = LEFT);
+
+ protected:
+ /**
+ * Holds the clip area stack.
+ */
+ std::stack<ClipRectangle> mClipStack;
+
+ /**
+ * Holds the current font.
+ */
+ Font* mFont;
+ };
+}
+
+#endif // end GCN_GRAPHICS_HPP