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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 | } |
this report was generated by version 1.0.5 of jcoverage. |
copyright © 2003, jcoverage ltd. all rights reserved. |