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1 | /* | |
2 | * Copyright (c) 2005, 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 | * Created on Apr 16, 2005 | |
9 | */ | |
10 | ||
11 | package edu.uci.ics.jung.visualization.transform; | |
12 | ||
13 | import java.awt.Shape; | |
14 | import java.awt.geom.AffineTransform; | |
15 | import java.awt.geom.GeneralPath; | |
16 | import java.awt.geom.NoninvertibleTransformException; | |
17 | import java.awt.geom.PathIterator; | |
18 | import java.awt.geom.Point2D; | |
19 | ||
20 | import edu.uci.ics.jung.visualization.transform.shape.ShapeTransformer; | |
21 | ||
22 | /** | |
23 | * | |
24 | * Provides methods to map points from one coordinate system to | |
25 | * another, by delegating to a wrapped AffineTransform (uniform) | |
26 | * and its inverse. | |
27 | * | |
28 | * @author Tom Nelson - RABA Technologies | |
29 | */ | |
30 | public class AffineTransformer implements Transformer, ShapeTransformer { | |
31 | ||
32 | protected AffineTransform inverse; | |
33 | ||
34 | /** | |
35 | * the AffineTransform to use. Initialize to identity | |
36 | * | |
37 | */ | |
38 | 0 | protected AffineTransform transform = new AffineTransform(); |
39 | ||
40 | /** | |
41 | * create an instance that does not transform points | |
42 | * | |
43 | */ | |
44 | 0 | public AffineTransformer() { |
45 | // nothing left to do | |
46 | 0 | } |
47 | /** | |
48 | * Create an instance with the supplied transform | |
49 | */ | |
50 | 0 | public AffineTransformer(AffineTransform transform) { |
51 | 0 | if(transform != null) |
52 | 0 | this.transform = transform; |
53 | 0 | } |
54 | ||
55 | /** | |
56 | * @return Returns the transform. | |
57 | */ | |
58 | public AffineTransform getTransform() { | |
59 | 0 | return transform; |
60 | } | |
61 | /** | |
62 | * @param transform The transform to set. | |
63 | */ | |
64 | public void setTransform(AffineTransform transform) { | |
65 | 0 | this.transform = transform; |
66 | 0 | } |
67 | ||
68 | /** | |
69 | * applies the inverse transform to the supplied point | |
70 | * @param p | |
71 | * @return | |
72 | */ | |
73 | public Point2D inverseTransform(Point2D p) { | |
74 | ||
75 | 0 | return getInverse().transform(p, null); |
76 | } | |
77 | ||
78 | public AffineTransform getInverse() { | |
79 | 0 | if(inverse == null) { |
80 | try { | |
81 | 0 | inverse = transform.createInverse(); |
82 | 0 | } catch (NoninvertibleTransformException e) { |
83 | 0 | e.printStackTrace(); |
84 | 0 | } |
85 | } | |
86 | 0 | return inverse; |
87 | } | |
88 | ||
89 | /** | |
90 | * getter for scalex | |
91 | */ | |
92 | public double getScaleX() { | |
93 | 0 | return transform.getScaleX(); |
94 | } | |
95 | ||
96 | /** | |
97 | * getter for scaley | |
98 | */ | |
99 | public double getScaleY() { | |
100 | 0 | return transform.getScaleY(); |
101 | } | |
102 | ||
103 | public double getScale() { | |
104 | 0 | return Math.sqrt(transform.getDeterminant()); |
105 | } | |
106 | ||
107 | /** | |
108 | * getter for shear in x axis | |
109 | */ | |
110 | public double getShearX() { | |
111 | 0 | return transform.getShearX(); |
112 | } | |
113 | ||
114 | /** | |
115 | * getter for shear in y axis | |
116 | */ | |
117 | public double getShearY() { | |
118 | 0 | return transform.getShearY(); |
119 | } | |
120 | ||
121 | /** | |
122 | * get the translate x value | |
123 | */ | |
124 | public double getTranslateX() { | |
125 | 0 | return transform.getTranslateX(); |
126 | } | |
127 | ||
128 | /** | |
129 | * get the translate y value | |
130 | */ | |
131 | public double getTranslateY() { | |
132 | 0 | return transform.getTranslateY(); |
133 | } | |
134 | ||
135 | ||
136 | ||
137 | ||
138 | ||
139 | /** | |
140 | * applies the transform to the supplied point | |
141 | */ | |
142 | public Point2D transform(Point2D p) { | |
143 | 0 | if(p == null) return null; |
144 | 0 | return transform.transform(p, null); |
145 | } | |
146 | ||
147 | /** | |
148 | * transform the supplied shape from graph coordinates to | |
149 | * screen coordinates | |
150 | * @return the GeneralPath of the transformed shape | |
151 | */ | |
152 | public Shape transform(Shape shape) { | |
153 | 0 | GeneralPath newPath = new GeneralPath(); |
154 | 0 | float[] coords = new float[6]; |
155 | 0 | for(PathIterator iterator=shape.getPathIterator(null); |
156 | 0 | iterator.isDone() == false; |
157 | 0 | iterator.next()) { |
158 | 0 | int type = iterator.currentSegment(coords); |
159 | 0 | switch(type) { |
160 | case PathIterator.SEG_MOVETO: | |
161 | 0 | Point2D p = transform(new Point2D.Float(coords[0], coords[1])); |
162 | 0 | newPath.moveTo((float)p.getX(), (float)p.getY()); |
163 | 0 | break; |
164 | ||
165 | case PathIterator.SEG_LINETO: | |
166 | 0 | p = transform(new Point2D.Float(coords[0], coords[1])); |
167 | 0 | newPath.lineTo((float)p.getX(), (float) p.getY()); |
168 | 0 | break; |
169 | ||
170 | case PathIterator.SEG_QUADTO: | |
171 | 0 | p = transform(new Point2D.Float(coords[0], coords[1])); |
172 | 0 | Point2D q = transform(new Point2D.Float(coords[2], coords[3])); |
173 | 0 | newPath.quadTo((float)p.getX(), (float)p.getY(), (float)q.getX(), (float)q.getY()); |
174 | 0 | break; |
175 | ||
176 | case PathIterator.SEG_CUBICTO: | |
177 | 0 | p = transform(new Point2D.Float(coords[0], coords[1])); |
178 | 0 | q = transform(new Point2D.Float(coords[2], coords[3])); |
179 | 0 | Point2D r = transform(new Point2D.Float(coords[4], coords[5])); |
180 | 0 | newPath.curveTo((float)p.getX(), (float)p.getY(), |
181 | (float)q.getX(), (float)q.getY(), | |
182 | (float)r.getX(), (float)r.getY()); | |
183 | 0 | break; |
184 | ||
185 | case PathIterator.SEG_CLOSE: | |
186 | 0 | newPath.closePath(); |
187 | break; | |
188 | ||
189 | } | |
190 | } | |
191 | 0 | return newPath; |
192 | } | |
193 | ||
194 | /** | |
195 | * transform the supplied shape from graph coordinates to | |
196 | * screen coordinates | |
197 | * @return the GeneralPath of the transformed shape | |
198 | */ | |
199 | public Shape inverseTransform(Shape shape) { | |
200 | 0 | GeneralPath newPath = new GeneralPath(); |
201 | 0 | float[] coords = new float[6]; |
202 | 0 | for(PathIterator iterator=shape.getPathIterator(null); |
203 | 0 | iterator.isDone() == false; |
204 | 0 | iterator.next()) { |
205 | 0 | int type = iterator.currentSegment(coords); |
206 | 0 | switch(type) { |
207 | case PathIterator.SEG_MOVETO: | |
208 | 0 | Point2D p = inverseTransform(new Point2D.Float(coords[0], coords[1])); |
209 | 0 | newPath.moveTo((float)p.getX(), (float)p.getY()); |
210 | 0 | break; |
211 | ||
212 | case PathIterator.SEG_LINETO: | |
213 | 0 | p = inverseTransform(new Point2D.Float(coords[0], coords[1])); |
214 | 0 | newPath.lineTo((float)p.getX(), (float) p.getY()); |
215 | 0 | break; |
216 | ||
217 | case PathIterator.SEG_QUADTO: | |
218 | 0 | p = inverseTransform(new Point2D.Float(coords[0], coords[1])); |
219 | 0 | Point2D q = inverseTransform(new Point2D.Float(coords[2], coords[3])); |
220 | 0 | newPath.quadTo((float)p.getX(), (float)p.getY(), (float)q.getX(), (float)q.getY()); |
221 | 0 | break; |
222 | ||
223 | case PathIterator.SEG_CUBICTO: | |
224 | 0 | p = inverseTransform(new Point2D.Float(coords[0], coords[1])); |
225 | 0 | q = inverseTransform(new Point2D.Float(coords[2], coords[3])); |
226 | 0 | Point2D r = inverseTransform(new Point2D.Float(coords[4], coords[5])); |
227 | 0 | newPath.curveTo((float)p.getX(), (float)p.getY(), |
228 | (float)q.getX(), (float)q.getY(), | |
229 | (float)r.getX(), (float)r.getY()); | |
230 | 0 | break; |
231 | ||
232 | case PathIterator.SEG_CLOSE: | |
233 | 0 | newPath.closePath(); |
234 | break; | |
235 | ||
236 | } | |
237 | } | |
238 | 0 | return newPath; |
239 | } | |
240 | ||
241 | public double getRotation() { | |
242 | 0 | double[] unitVector = new double[]{0,0,1,0}; |
243 | 0 | double[] result = new double[4]; |
244 | ||
245 | 0 | transform.transform(unitVector, 0, result, 0, 2); |
246 | ||
247 | 0 | double dy = Math.abs(result[3] - result[1]); |
248 | 0 | double length = Point2D.distance(result[0], result[1], result[2], result[3]); |
249 | 0 | double rotation = Math.asin(dy / length); |
250 | ||
251 | 0 | if (result[3] - result[1] > 0) { |
252 | 0 | if (result[2] - result[0] < 0) { |
253 | 0 | rotation = Math.PI - rotation; |
254 | } | |
255 | } else { | |
256 | 0 | if (result[2] - result[0] > 0) { |
257 | 0 | rotation = 2 * Math.PI - rotation; |
258 | } else { | |
259 | 0 | rotation = rotation + Math.PI; |
260 | } | |
261 | } | |
262 | ||
263 | 0 | return rotation; |
264 | } | |
265 | ||
266 | public String toString() { | |
267 | 0 | return "Transformer using "+transform; |
268 | } | |
269 | ||
270 | } |
this report was generated by version 1.0.5 of jcoverage. |
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