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Sourcecode: libjgoodies-animation-java version File versions  Download package

BasicTextRenderer.java

/*
 * Copyright (c) 2001-2006 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 *  o Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer. 
 *     
 *  o 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. 
 *     
 *  o Neither the name of JGoodies Karsten Lentzsch 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. 
 */

package com.jgoodies.animation.renderer;

import java.awt.Graphics2D;


/**
 * Renders a text with modifiable scaling, color, glyph spacing and position.
 *
 * @author Karsten Lentzsch
 * @version $Revision: 1.1 $
 */
00042 public final class BasicTextRenderer extends AbstractTextRenderer {
      
      private float offsetX = 0.0f;
      private float offsetY = 0.0f;
      private float scaleX  = 1.0f;
      private float scaleY  = 1.0f;
      private float space   = 0.0f;


      /**
       * Constructs a renderer for a text that can be scaled, moved, and 
     * change inter-glyph space.
     * 
     * @param text   the text to be displayed
       */
00057       public BasicTextRenderer(String text) {    super(text);           }
      
      
      public float getOffsetX()                       { return offsetX;             }
      public float getOffsetY()                       { return offsetY;             }
      public float getSpace()                         { return space;               }
      public void  setOffsetX(float offsetX){ this.offsetX = offsetX;   }
      public void  setOffsetY(float offsetY){ this.offsetY = offsetY;   }
      public void  setSpace(float space)  { this.space   = space; }
      public float getScaleX()                        { return scaleX;              }
      public float getScaleY()                        { return scaleY;              }
      

      public void setScaleX(float scaleX) {     
            if (scaleX <= 0.0f) 
                  throw new IllegalArgumentException("scaleX must be positive.");
                  
            this.scaleX = scaleX;   
      }

      
      public void setScaleY(float scaleY) {     
            if (scaleY <= 0.0f) 
                  throw new IllegalArgumentException("scaleY must be positive.");
                  
            this.scaleY = scaleY;   
      }


      /**
       * Renders the text. Firstly ensures a valid cache, then sets 
       * the color, and finally paints the cached glyph shapes.
     * 
     * @param g2   the graphics context to render on
     * @param width   the width of the drawing surface
     * @param height  the height of the drawing surface
       */
00094       public void render(Graphics2D g2, int width, int height) {
            ensureValidCache(g2);

            int   glyphCount  = cachedGlyphShapes.length;
            float totalSpace  = (glyphCount - 1) * space;
            float totalWidth  = cachedTextWidth + totalSpace;
            float textHeight  = getAdjustedAscent();
            float xOffset     = getOffsetX() + (width  - totalWidth * scaleX) / 2.0f;
            float yOffset     = getOffsetY() + (height + textHeight * scaleY) / 2.0f - getAdjustedDescent();
            
            g2.setColor(getColor());
            g2.translate(xOffset, yOffset);
            g2.scale(scaleX, scaleY);
            for (int i = 0; i < glyphCount; i++) {
                  g2.fill(cachedGlyphShapes[i]);
                  g2.translate(space, 0);
            }
            g2.scale(1.0f / scaleX, 1.0f / scaleY);
            g2.translate(-totalSpace -xOffset, -yOffset);
      }
      
}

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