bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/ViewerCanvas.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.graphviz.drawable;\r
  13 \r
  14 import java.awt.Canvas;\r
  15 import java.awt.Color;\r
  16 import java.awt.Graphics;\r
  17 import java.awt.Graphics2D;\r
  18 import java.awt.Point;\r
  19 import java.awt.RenderingHints;\r
  20 import java.awt.event.ComponentAdapter;\r
  21 import java.awt.event.ComponentEvent;\r
  22 import java.awt.event.KeyAdapter;\r
  23 import java.awt.event.KeyEvent;\r
  24 import java.awt.event.MouseAdapter;\r
  25 import java.awt.event.MouseEvent;\r
  26 import java.awt.event.MouseWheelEvent;\r
  27 import java.awt.event.MouseWheelListener;\r
  28 import java.awt.geom.AffineTransform;\r
  29 import java.awt.geom.Rectangle2D;\r
  30 import java.awt.image.VolatileImage;\r
  31 \r
  32 /**\r
  33  * A canvas showing a given Drawable.\r
  34  * \r
  35  * @author Hannu Niemist�\r
  36  */\r
  37 public class ViewerCanvas extends Canvas {\r
  38 \r
  39     private static final long serialVersionUID = -1094658958968314511L;\r
  40     \r
  41     AffineTransform transform;\r
  42     Point prev;\r
  43     VolatileImage im;\r
  44     \r
  45     Drawable drawable;\r
  46 \r
  47     public ViewerCanvas(Drawable drawable) {\r
  48         this.drawable = drawable;\r
  49         setBackground(Color.WHITE);    \r
  50         addKeyListener(new KeyAdapter() {\r
  51 \r
  52             @Override\r
  53             public void keyPressed(KeyEvent e) {\r
  54                 if(e.getKeyChar()=='1') {\r
  55                     fit();\r
  56                     repaint();\r
  57                 }\r
  58             }\r
  59 \r
  60         });\r
  61         addMouseListener(new MouseAdapter() {\r
  62 \r
  63             @Override\r
  64             public void mousePressed(MouseEvent e) {\r
  65                 prev = e.getPoint();\r
  66             }                           \r
  67         });\r
  68         addMouseMotionListener(new MouseAdapter() {\r
  69             @Override\r
  70             public void mouseDragged(MouseEvent e) {\r
  71                 Point cur = e.getPoint();\r
  72                 double deltaX = cur.getX()-prev.getX();\r
  73                 double deltaY = cur.getY()-prev.getY();                                 \r
  74                 transform.preConcatenate(AffineTransform.getTranslateInstance(deltaX, deltaY));                                         \r
  75                 repaint();\r
  76                 prev = cur;\r
  77             }\r
  78         });\r
  79         addMouseWheelListener(new MouseWheelListener() {\r
  80 \r
  81             @Override\r
  82             public void mouseWheelMoved(MouseWheelEvent e) {\r
  83                 if(transform != null) {\r
  84                     double scale = Math.exp(-0.1*e.getUnitsToScroll());\r
  85                     Point p = e.getPoint();\r
  86                     AffineTransform mod = new AffineTransform();\r
  87                     mod.translate(p.getX(), p.getY());\r
  88                     mod.scale(scale, scale);\r
  89                     mod.translate(-p.getX(), -p.getY());\r
  90                     transform.preConcatenate(mod);                                              \r
  91                     repaint();\r
  92                 }\r
  93             }\r
  94 \r
  95         });\r
  96         addComponentListener(new ComponentAdapter() {\r
  97             @Override\r
  98             public void componentResized(ComponentEvent e) {\r
  99                 if(getWidth() > 0 && getHeight() > 0) {\r
 100                         im = createVolatileImage(getWidth(), getHeight());\r
 101                         repaint();\r
 102                 }\r
 103             }\r
 104         });\r
 105     }\r
 106 \r
 107     public void fit() {\r
 108         Rectangle2D bounds = drawable.getBounds();\r
 109 \r
 110         Rectangle2D container = getBounds();\r
 111         double scale = Math.min(\r
 112             container.getWidth() / bounds.getWidth(), \r
 113             container.getHeight() / bounds.getHeight());\r
 114 \r
 115         transform = new AffineTransform(\r
 116             scale, 0.0,\r
 117             0.0, scale,\r
 118             container.getX() + container.getWidth() * 0.5 - bounds.getCenterX() * scale,\r
 119             container.getY() + container.getHeight() * 0.5 - bounds.getCenterY() * scale\r
 120         );\r
 121     }\r
 122 \r
 123     @Override\r
 124     public void paint(Graphics _g) {\r
 125         do {\r
 126                 if (im == null || im.validate(getGraphicsConfiguration()) ==\r
 127                         VolatileImage.IMAGE_INCOMPATIBLE) {\r
 128                     im = createVolatileImage(getWidth(), getHeight());\r
 129                 }\r
 130                 \r
 131                 Graphics2D g = (Graphics2D)im.getGraphics();\r
 132                 \r
 133                 g.clearRect(0, 0, im.getWidth(null), im.getHeight(null));\r
 134         \r
 135                 g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);\r
 136                 g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);\r
 137                 g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);\r
 138         \r
 139                 if(transform == null)\r
 140                     fit();\r
 141                 g.setTransform(transform);\r
 142         \r
 143                 drawable.draw(g, null);\r
 144             g.dispose();\r
 145         } while(im.contentsLost());\r
 146 \r
 147         _g.drawImage(im, 0, 0, this);\r
 148     }\r
 149 \r
 150     @Override\r
 151     public void update(Graphics g) {\r
 152         paint(g);\r
 153     }\r
 154     \r
 155     public AffineTransform getTransform() {\r
 156         return transform;\r
 157     }\r
 158 \r
 159 }\r
 160 \r