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|---|---|---|
| 1 | /* | |
| 2 | * Copyright (c) 2003, the JUNG Project and the Regents of the University of | |
| 3 | * California All rights reserved. | |
| 4 | * | |
| 5 | * This software is open-source under the BSD license; see either "license.txt" | |
| 6 | * or http://jung.sourceforge.net/license.txt for a description. | |
| 7 | * | |
| 8 | */ | |
| 9 | package edu.uci.ics.jung.visualization.transform; | |
| 10 | ||
| 11 | import java.awt.Component; | |
| 12 | import java.awt.Dimension; | |
| 13 | import java.awt.event.ComponentAdapter; | |
| 14 | import java.awt.event.ComponentEvent; | |
| 15 | import java.awt.geom.Ellipse2D; | |
| 16 | import java.awt.geom.Point2D; | |
| 17 | ||
| 18 | /** | |
| 19 | * LensTransformer wraps a MutableAffineTransformer and modifies | |
| 20 | * the transform and inverseTransform methods so that they create a | |
| 21 | * projection of the graph points within an elliptical lens. | |
| 22 | * | |
| 23 | * LensTransformer uses an | |
| 24 | * affine transform to cause translation, scaling, rotation, and shearing | |
| 25 | * while applying a possibly non-affine filter in its transform and | |
| 26 | * inverseTransform methods. | |
| 27 | * | |
| 28 | * @author Tom Nelson - RABA Technologies | |
| 29 | * | |
| 30 | * | |
| 31 | */ | |
| 32 | 0 | public abstract class LensTransformer extends MutableTransformerDecorator implements MutableTransformer { |
| 33 | ||
| 34 | /** | |
| 35 | * the area affected by the transform | |
| 36 | */ | |
| 37 | 0 | protected Ellipse2D ellipse = new Ellipse2D.Float(); |
| 38 | ||
| 39 | 0 | protected float magnification = 0.7f; |
| 40 | ||
| 41 | /** | |
| 42 | * create an instance, setting values from the passed component | |
| 43 | * and registering to listen for size changes on the component | |
| 44 | * @param component | |
| 45 | */ | |
| 46 | public LensTransformer(Component component) { | |
| 47 | 0 | this(component, new MutableAffineTransformer()); |
| 48 | 0 | } |
| 49 | /** | |
| 50 | * create an instance with a possibly shared transform | |
| 51 | * @param component | |
| 52 | * @param delegate | |
| 53 | */ | |
| 54 | public LensTransformer(Component component, MutableTransformer delegate) { | |
| 55 | 0 | super(delegate); |
| 56 | 0 | setComponent(component); |
| 57 | 0 | component.addComponentListener(new ComponentListenerImpl()); |
| 58 | 0 | } |
| 59 | ||
| 60 | /** | |
| 61 | * set values from the passed component. | |
| 62 | * declared private so it can't be overridden | |
| 63 | * @param component | |
| 64 | */ | |
| 65 | private void setComponent(Component component) { | |
| 66 | 0 | Dimension d = component.getSize(); |
| 67 | 0 | if(d.width <= 0 || d.height <= 0) { |
| 68 | 0 | d = component.getPreferredSize(); |
| 69 | } | |
| 70 | 0 | float ewidth = d.width/1.5f; |
| 71 | 0 | float eheight = d.height/1.5f; |
| 72 | 0 | ellipse.setFrame(d.width/2-ewidth/2, d.height/2-eheight/2, ewidth, eheight); |
| 73 | 0 | } |
| 74 | ||
| 75 | /** | |
| 76 | * @return Returns the magnification. | |
| 77 | */ | |
| 78 | public float getMagnification() { | |
| 79 | 0 | return magnification; |
| 80 | } | |
| 81 | /** | |
| 82 | * @param magnification The magnification to set. | |
| 83 | */ | |
| 84 | public void setMagnification(float magnification) { | |
| 85 | 0 | this.magnification = magnification; |
| 86 | 0 | } |
| 87 | /** | |
| 88 | * @return Returns the viewCenter. | |
| 89 | */ | |
| 90 | public Point2D getViewCenter() { | |
| 91 | 0 | return new Point2D.Double(ellipse.getCenterX(), ellipse.getCenterY()); |
| 92 | } | |
| 93 | /** | |
| 94 | * @param viewCenter The viewCenter to set. | |
| 95 | */ | |
| 96 | public void setViewCenter(Point2D viewCenter) { | |
| 97 | 0 | double width = ellipse.getWidth(); |
| 98 | 0 | double height = ellipse.getHeight(); |
| 99 | 0 | ellipse.setFrame(viewCenter.getX()-width/2, |
| 100 | viewCenter.getY()-height/2, | |
| 101 | width, height); | |
| 102 | 0 | } |
| 103 | ||
| 104 | /** | |
| 105 | * @return Returns the viewRadius. | |
| 106 | */ | |
| 107 | public double getViewRadius() { | |
| 108 | 0 | return ellipse.getHeight()/2; |
| 109 | } | |
| 110 | /** | |
| 111 | * @param viewRadius The viewRadius to set. | |
| 112 | */ | |
| 113 | public void setViewRadius(double viewRadius) { | |
| 114 | 0 | double x = ellipse.getCenterX(); |
| 115 | 0 | double y = ellipse.getCenterY(); |
| 116 | 0 | double viewRatio = getRatio(); |
| 117 | 0 | ellipse.setFrame(x-viewRadius/viewRatio, |
| 118 | y-viewRadius, | |
| 119 | 2*viewRadius/viewRatio, | |
| 120 | 2*viewRadius); | |
| 121 | 0 | } |
| 122 | ||
| 123 | /** | |
| 124 | * @return Returns the ratio. | |
| 125 | */ | |
| 126 | public double getRatio() { | |
| 127 | 0 | return ellipse.getHeight()/ellipse.getWidth(); |
| 128 | } | |
| 129 | ||
| 130 | public void setEllipse(Ellipse2D ellipse) { | |
| 131 | 0 | this.ellipse = ellipse; |
| 132 | 0 | } |
| 133 | public Ellipse2D getEllipse() { | |
| 134 | 0 | return ellipse; |
| 135 | } | |
| 136 | public void setToIdentity() { | |
| 137 | 0 | this.delegate.setToIdentity(); |
| 138 | 0 | } |
| 139 | ||
| 140 | /** | |
| 141 | * react to size changes on a component | |
| 142 | */ | |
| 143 | protected class ComponentListenerImpl extends ComponentAdapter { | |
| 144 | public void componentResized(ComponentEvent e) { | |
| 145 | setComponent(e.getComponent()); | |
| 146 | } | |
| 147 | } | |
| 148 | ||
| 149 | /** | |
| 150 | * a convenience class to represent a point in | |
| 151 | * polar coordinates | |
| 152 | */ | |
| 153 | protected static class PolarPoint extends Point2D.Double { | |
| 154 | public PolarPoint(double theta, double radius) { | |
| 155 | super(theta, radius); | |
| 156 | } | |
| 157 | public double getTheta() { return getX(); } | |
| 158 | public double getRadius() { return getY(); } | |
| 159 | public void setTheta(double theta) { setLocation(theta, getRadius()); } | |
| 160 | public void setRadius(double radius) { setLocation(getTheta(), radius); } | |
| 161 | } | |
| 162 | ||
| 163 | /** | |
| 164 | * Returns the result of converting <code>polar</code> to Cartesian coordinates. | |
| 165 | */ | |
| 166 | protected Point2D polarToCartesian(PolarPoint polar) { | |
| 167 | 0 | return polarToCartesian(polar.getTheta(), polar.getRadius()); |
| 168 | } | |
| 169 | ||
| 170 | /** | |
| 171 | * Returns the result of converting <code>(theta, radius)</code> to Cartesian coordinates. | |
| 172 | */ | |
| 173 | protected Point2D polarToCartesian(double theta, double radius) { | |
| 174 | 0 | return new Point2D.Double(radius*Math.cos(theta), radius*Math.sin(theta)); |
| 175 | } | |
| 176 | ||
| 177 | /** | |
| 178 | * Returns the result of converting <code>point</code> to polar coordinates. | |
| 179 | */ | |
| 180 | protected PolarPoint cartesianToPolar(Point2D point) { | |
| 181 | 0 | return cartesianToPolar(point.getX(), point.getY()); |
| 182 | } | |
| 183 | ||
| 184 | /** | |
| 185 | * Returns the result of converting <code>(x, y)</code> to polar coordinates. | |
| 186 | */ | |
| 187 | protected PolarPoint cartesianToPolar(double x, double y) { | |
| 188 | 0 | double theta = Math.atan2(y,x); |
| 189 | 0 | double radius = Math.sqrt(x*x+y*y); |
| 190 | 0 | return new PolarPoint(theta, radius); |
| 191 | } | |
| 192 | ||
| 193 | /** | |
| 194 | * override base class transform to project the fisheye effect | |
| 195 | */ | |
| 196 | public abstract Point2D transform(Point2D graphPoint); | |
| 197 | ||
| 198 | /** | |
| 199 | * override base class to un-project the fisheye effect | |
| 200 | */ | |
| 201 | public abstract Point2D inverseTransform(Point2D viewPoint); | |
| 202 | ||
| 203 | public double getDistanceFromCenter(Point2D p) { | |
| 204 | 0 | double dx = ellipse.getCenterX()-p.getX(); |
| 205 | 0 | double dy = ellipse.getCenterY()-p.getY(); |
| 206 | 0 | dx *= getRatio(); |
| 207 | 0 | return Math.sqrt(dx*dx + dy*dy); |
| 208 | } | |
| 209 | } |
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this report was generated by version 1.0.5 of jcoverage. |
copyright © 2003, jcoverage ltd. all rights reserved. |