1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.graphviz.drawable;
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14 import java.awt.Canvas;
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15 import java.awt.Color;
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16 import java.awt.Graphics;
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17 import java.awt.Graphics2D;
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18 import java.awt.Point;
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19 import java.awt.RenderingHints;
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20 import java.awt.event.ComponentAdapter;
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21 import java.awt.event.ComponentEvent;
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22 import java.awt.event.KeyAdapter;
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23 import java.awt.event.KeyEvent;
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24 import java.awt.event.MouseAdapter;
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25 import java.awt.event.MouseEvent;
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26 import java.awt.event.MouseWheelEvent;
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27 import java.awt.event.MouseWheelListener;
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28 import java.awt.geom.AffineTransform;
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29 import java.awt.geom.Rectangle2D;
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30 import java.awt.image.VolatileImage;
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33 * A canvas showing a given Drawable.
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35 * @author Hannu Niemist�
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37 public class ViewerCanvas extends Canvas {
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39 private static final long serialVersionUID = -1094658958968314511L;
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41 AffineTransform transform;
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47 public ViewerCanvas(Drawable drawable) {
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48 this.drawable = drawable;
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49 setBackground(Color.WHITE);
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50 addKeyListener(new KeyAdapter() {
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53 public void keyPressed(KeyEvent e) {
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54 if(e.getKeyChar()=='1') {
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61 addMouseListener(new MouseAdapter() {
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64 public void mousePressed(MouseEvent e) {
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65 prev = e.getPoint();
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68 addMouseMotionListener(new MouseAdapter() {
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70 public void mouseDragged(MouseEvent e) {
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71 Point cur = e.getPoint();
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72 double deltaX = cur.getX()-prev.getX();
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73 double deltaY = cur.getY()-prev.getY();
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74 transform.preConcatenate(AffineTransform.getTranslateInstance(deltaX, deltaY));
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79 addMouseWheelListener(new MouseWheelListener() {
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82 public void mouseWheelMoved(MouseWheelEvent e) {
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83 if(transform != null) {
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84 double scale = Math.exp(-0.1*e.getUnitsToScroll());
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85 Point p = e.getPoint();
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86 AffineTransform mod = new AffineTransform();
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87 mod.translate(p.getX(), p.getY());
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88 mod.scale(scale, scale);
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89 mod.translate(-p.getX(), -p.getY());
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90 transform.preConcatenate(mod);
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96 addComponentListener(new ComponentAdapter() {
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98 public void componentResized(ComponentEvent e) {
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99 if(getWidth() > 0 && getHeight() > 0) {
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100 im = createVolatileImage(getWidth(), getHeight());
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107 public void fit() {
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108 Rectangle2D bounds = drawable.getBounds();
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110 Rectangle2D container = getBounds();
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111 double scale = Math.min(
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112 container.getWidth() / bounds.getWidth(),
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113 container.getHeight() / bounds.getHeight());
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115 transform = new AffineTransform(
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118 container.getX() + container.getWidth() * 0.5 - bounds.getCenterX() * scale,
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119 container.getY() + container.getHeight() * 0.5 - bounds.getCenterY() * scale
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124 public void paint(Graphics _g) {
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126 if (im == null || im.validate(getGraphicsConfiguration()) ==
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127 VolatileImage.IMAGE_INCOMPATIBLE) {
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128 im = createVolatileImage(getWidth(), getHeight());
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131 Graphics2D g = (Graphics2D)im.getGraphics();
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133 g.clearRect(0, 0, im.getWidth(null), im.getHeight(null));
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135 g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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136 g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
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137 g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
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139 if(transform == null)
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141 g.setTransform(transform);
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143 drawable.draw(g, null);
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145 } while(im.contentsLost());
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147 _g.drawImage(im, 0, 0, this);
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151 public void update(Graphics g) {
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155 public AffineTransform getTransform() {
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