/*      _______   __   __   __   ______   __   __   _______   __   __                 
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\                
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /                 
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /                  
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /                   
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /                    
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/                      
 *
 * Copyright (c) 2004, 2005 darkbits                        Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
 *                                               .)j(] .d_/ '-(  P .   S
 * License: (BSD)                                <Td/Z <fP"5(\"??"\a.  .L
 * Redistribution and use in source and          _dV>ws?a-?'      ._/L  #'
 * binary forms, with or without                 )4d[#7r, .   '     )d`)[
 * modification, are permitted provided         _Q-5'5W..j/?'   -?!\)cam'
 * that the following conditions are met:       j<<WP+k/);.        _W=j f
 * 1. Redistributions of source code must       .$%w\/]Q  . ."'  .  mj$
 *    retain the above copyright notice,        ]E.pYY(Q]>.   a     J@\
 *    this list of conditions and the           j(]1u<sE"L,. .   ./^ ]{a
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 * 2. Redistributions in binary form must        )_]X{Z('a_"a7'<a"a,  ]"[
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 *    documentation and/or other materials      .Z!=J ]e []('-4f _ ) -.)m]'
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT       )/ )/           !
 * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY         <  (; sac    ,    '
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 * 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.
 */

/*
 * For comments regarding functions please see the header file. 
 */

#include "guichan/graphics.h"
#include "guichan/exception.h"
#include "guichan/font.h"

namespace gcn
{

    Graphics::Graphics()
    {
        mFont = NULL;    
    }
  
    bool Graphics::pushClipArea(Rectangle area)
    {
        if (mClipStack.empty())
        {
            ClipRectangle carea;
            carea.x = area.x;
            carea.y = area.y;
            carea.width = area.width;
            carea.height = area.height;
            mClipStack.push(carea);
            return true;
        }

        ClipRectangle top = mClipStack.top();
        ClipRectangle carea;
        carea = area;
        carea.xOffset = top.xOffset + carea.x;
        carea.yOffset = top.yOffset + carea.y;
        carea.x += top.xOffset;
        carea.y += top.yOffset;

        bool result = carea.intersect(top);

        mClipStack.push(carea);

        return result;
    }

    void Graphics::popClipArea()
    {
    
        if (mClipStack.empty())
        {
            throw GCN_EXCEPTION("Tried to pop clip area from empty stack.");
        }    

        mClipStack.pop();    
    }

    const ClipRectangle& Graphics::getCurrentClipArea()
    {
        if (mClipStack.empty())
        {
            throw GCN_EXCEPTION("The clip area stack is empty.");
        }
        
        return mClipStack.top();
    }
    
    void Graphics::drawImage(const Image* image, int dstX, int dstY)
    {
        drawImage(image, 0, 0, dstX, dstY, image->getWidth(), image->getHeight());    
    }

    void Graphics::setFont(Font* font)
    {
        mFont = font;    
    }

    void Graphics::drawText(const std::string& text, int x, int y,
                            unsigned int alignment)
    {
        if (mFont == NULL)
        {
            throw GCN_EXCEPTION("No font set.");
        }

        switch (alignment)
        {
          case LEFT:            
              mFont->drawString(this, text, x, y);
              break;
          case CENTER:
              mFont->drawString(this, text, x - mFont->getWidth(text) / 2, y);
              break;
          case RIGHT:
              mFont->drawString(this, text, x - mFont->getWidth(text), y);
              break;
          default:
              throw GCN_EXCEPTION("Unknown alignment.");
        }        
    }    
}
