1 /*
2 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /**
25 * @test
26 * @bug 4418285
27 * @summary Tests that transforms modified with degenerate operations
28 * continue to return their more optimal type from getType().
29 * This test also confirms that isIdentity() returns the
30 * optimal value under all histories of modification.
31 * @run main GetTypeOptimization
32 */
33
34 import java.awt.geom.AffineTransform;
35 import java.util.Random;
36
37 public class GetTypeOptimization {
38 static int TYPE_IDENTITY = AffineTransform.TYPE_IDENTITY;
39 static int TYPE_TRANSLATION = AffineTransform.TYPE_TRANSLATION;
40 static int TYPE_UNIFORM_SCALE = AffineTransform.TYPE_UNIFORM_SCALE;
41 static int TYPE_GENERAL_SCALE = AffineTransform.TYPE_GENERAL_SCALE;
42 static int TYPE_FLIP = AffineTransform.TYPE_FLIP;
43 static int TYPE_QUADRANT_ROTATION = AffineTransform.TYPE_QUADRANT_ROTATION;
44 static int TYPE_GENERAL_ROTATION = AffineTransform.TYPE_GENERAL_ROTATION;
45 static int TYPE_GENERAL_TRANSFORM = AffineTransform.TYPE_GENERAL_TRANSFORM;
46
47 public static Random rand = new Random();
48
49 public static boolean verbose;
50 public static int numerrors;
51
52 public static void main(String argv[]) {
53 verbose = (argv.length != 0);
54
55 checkBug4418285();
56
57 checkAtType(new AffineTransform());
58 checkAtType(AffineTransform.getTranslateInstance(0, 0));
59 checkAtType(AffineTransform.getScaleInstance(1, 1));
60 checkAtType(AffineTransform.getShearInstance(0, 0));
61 checkAtType(AffineTransform.getRotateInstance(0));
62 checkAtType(AffineTransform.getRotateInstance(0, 0, 0));
63 for (int i = 90; i <= 360; i += 90) {
64 double angle = Math.toRadians(i);
65 checkAtType(AffineTransform.getRotateInstance(angle));
66 checkAtType(AffineTransform.getRotateInstance(angle, 0, 0));
67 }
68
69 AffineTransform at = new AffineTransform();
70 checkAtType(at);
71
72 at.setToIdentity(); checkAtType(at);
73 at.setToTranslation(0.0, 0.0); checkAtType(at);
74 at.setToScale(1.0, 1.0); checkAtType(at);
75 at.setToShear(0.0, 0.0); checkAtType(at);
76 at.setToRotation(0); checkAtType(at);
77 at.setToRotation(0, 0, 0); checkAtType(at);
78 for (int i = 90; i <= 360; i += 90) {
79 double angle = Math.toRadians(i);
80 at.setToRotation(angle); checkAtType(at);
81 at.setToRotation(angle, 0, 0); checkAtType(at);
82 }
83
84 at.setToIdentity(); at.scale(1, 1); checkAtType(at);
85 at.setToIdentity(); at.translate(0, 0); checkAtType(at);
86 at.setToIdentity(); at.shear(0, 0); checkAtType(at);
87 at.setToIdentity(); at.rotate(0); checkAtType(at);
88 for (int i = 90; i <= 360; i += 90) {
89 double angle = Math.toRadians(i);
90 at.setToIdentity(); at.rotate(angle); checkAtType(at);
91 at.setToIdentity(); at.rotate(angle, 0, 0); checkAtType(at);
92 }
93
94 at.setToIdentity();
95 for (int i = 0; i < 4; i++) {
96 at.rotate(Math.toRadians(90)); checkAtType(at);
97 }
98
99 at.setToIdentity();
100 at.scale(2, 2); checkAtType(at);
101 at.scale(.5, .5); checkAtType(at);
102
103 for (int n = 1; n <= 3; n++) {
104 for (int i = 0; i < 500; i++) {
105 checkAtType(makeRandomTransform(n));
106 }
107 }
108 if (numerrors != 0) {
109 if (!verbose) {
110 System.err.println("Rerun test with an argument for details");
111 }
112 throw new RuntimeException(numerrors+" tests failed!");
113 }
114 }
115
116 public static void checkBug4418285() {
117 AffineTransform id =
118 new AffineTransform ();
119 AffineTransform translate0 =
120 AffineTransform.getTranslateInstance (0, 0);
121 if (id.isIdentity() != translate0.isIdentity() ||
122 id.getType() != translate0.getType())
123 {
124 numerrors++;
125 if (verbose) {
126 System.err.println("id= " + id +
127 ", isIdentity()=" +
128 id.isIdentity());
129 System.err.println("translate0=" + translate0 +
130 ", isIdentity()=" +
131 translate0.isIdentity());
132 System.err.println("equals=" + id.equals (translate0));
133 System.err.println();
134 }
135 }
136 }
137
138 public static AffineTransform makeRandomTransform(int numops) {
139 AffineTransform at = new AffineTransform();
140 while (--numops >= 0) {
141 switch (rand.nextInt(4)) {
142 case 0:
143 at.scale(rand.nextDouble() * 5 - 2.5,
144 rand.nextDouble() * 5 - 2.5);
145 break;
146 case 1:
147 at.shear(rand.nextDouble() * 5 - 2.5,
148 rand.nextDouble() * 5 - 2.5);
149 break;
150 case 2:
151 at.rotate(rand.nextDouble() * Math.PI * 2);
152 break;
153 case 3:
154 at.translate(rand.nextDouble() * 50 - 25,
155 rand.nextDouble() * 50 - 25);
156 break;
157 default:
158 throw new InternalError("bad case!");
159 }
160 }
161 return at;
162 }
163
164 public static void checkAtType(AffineTransform at) {
165 int reftype = getRefType(at);
166 boolean isident = isIdentity(at);
167 for (int i = 0; i < 5; i++) {
168 boolean atisident = at.isIdentity();
169 int attype = at.getType();
170 if (isident != atisident || reftype != attype) {
171 numerrors++;
172 if (verbose) {
173 System.err.println(at+".isIdentity() == "+atisident);
174 System.err.println(at+".getType() == "+attype);
175 System.err.println("should be "+isident+", "+reftype);
176 new Throwable().printStackTrace();
177 System.err.println();
178 }
179 break;
180 }
181 }
182 }
183
184 public static boolean isIdentity(AffineTransform at) {
185 return (at.getScaleX() == 1 &&
186 at.getScaleY() == 1 &&
187 at.getShearX() == 0 &&
188 at.getShearY() == 0 &&
189 at.getTranslateX() == 0 &&
190 at.getTranslateY() == 0);
191
192 }
193
194 public static int getRefType(AffineTransform at) {
195 double m00 = at.getScaleX();
196 double m11 = at.getScaleY();
197 double m01 = at.getShearX();
198 double m10 = at.getShearY();
199 if (m00 * m01 + m10 * m11 != 0) {
200 // Transformed unit vectors are not perpendicular...
201 return TYPE_GENERAL_TRANSFORM;
202 }
203 int type = ((at.getTranslateX() != 0 || at.getTranslateY() != 0)
204 ? TYPE_TRANSLATION : TYPE_IDENTITY);
205 boolean sgn0, sgn1;
206 if (m01 == 0 && m10 == 0) {
207 sgn0 = (m00 >= 0.0);
208 sgn1 = (m11 >= 0.0);
209 if (sgn0 == sgn1) {
210 if (sgn0) {
211 // Both scaling factors non-negative - simple scale
212 if (m00 != m11) {
213 type |= TYPE_GENERAL_SCALE;
214 } else if (m00 != 1.0) {
215 type |= TYPE_UNIFORM_SCALE;
216 }
217 } else {
218 // Both scaling factors negative - 180 degree rotation
219 type |= TYPE_QUADRANT_ROTATION;
220 if (m00 != m11) {
221 type |= TYPE_GENERAL_SCALE;
222 } else if (m00 != -1.0) {
223 type |= TYPE_UNIFORM_SCALE;
224 }
225 }
226 } else {
227 // Scaling factor signs different - flip about some axis
228 type |= TYPE_FLIP;
229 if (m00 != -m11) {
230 type |= TYPE_GENERAL_SCALE;
231 } else if (m00 != 1.0 && m00 != -1.0) {
232 type |= TYPE_UNIFORM_SCALE;
233 }
234 }
235 } else if (m00 == 0 && m11 == 0) {
236 sgn0 = (m01 >= 0.0);
237 sgn1 = (m10 >= 0.0);
238 if (sgn0 != sgn1) {
239 // Different signs - simple 90 degree rotation
240 if (m01 != -m10) {
241 type |= (TYPE_QUADRANT_ROTATION | TYPE_GENERAL_SCALE);
242 } else if (m01 != 1.0 && m01 != -1.0) {
243 type |= (TYPE_QUADRANT_ROTATION | TYPE_UNIFORM_SCALE);
244 } else {
245 type |= TYPE_QUADRANT_ROTATION;
246 }
247 } else {
248 // Same signs - 90 degree rotation plus an axis flip too
249 if (m01 == m10) {
250 if (m01 == 0) {
251 // All four m[01][01] elements are 0
252 type |= TYPE_UNIFORM_SCALE;
253 } else {
254 // Note - shouldn't (1,1) be no scale at all?
255 type |= (TYPE_QUADRANT_ROTATION |
256 TYPE_FLIP |
257 TYPE_UNIFORM_SCALE);
258 }
259 } else {
260 type |= (TYPE_QUADRANT_ROTATION |
261 TYPE_FLIP |
262 TYPE_GENERAL_SCALE);
263 }
264 }
265 } else {
266 if (m00 * m11 >= 0.0) {
267 // sgn(m00) == sgn(m11) therefore sgn(m01) == -sgn(m10)
268 // This is the "unflipped" (right-handed) state
269 if (m00 != m11 || m01 != -m10) {
270 type |= (TYPE_GENERAL_ROTATION | TYPE_GENERAL_SCALE);
271 } else if (m00 == 0) {
272 // then m11 == 0 also
273 if (m01 == -m10) {
274 type |= (TYPE_QUADRANT_ROTATION | TYPE_UNIFORM_SCALE);
275 } else {
276 type |= (TYPE_QUADRANT_ROTATION | TYPE_GENERAL_SCALE);
277 }
278 } else if (m00 * m11 - m01 * m10 != 1.0) {
279 type |= (TYPE_GENERAL_ROTATION | TYPE_UNIFORM_SCALE);
280 } else {
281 type |= TYPE_GENERAL_ROTATION;
282 }
283 } else {
284 // sgn(m00) == -sgn(m11) therefore sgn(m01) == sgn(m10)
285 // This is the "flipped" (left-handed) state
286 if (m00 != -m11 || m01 != m10) {
287 type |= (TYPE_GENERAL_ROTATION |
288 TYPE_FLIP |
289 TYPE_GENERAL_SCALE);
290 } else if (m01 == 0) {
291 if (m00 == 1.0 || m00 == -1.0) {
292 type |= TYPE_FLIP;
293 } else {
294 type |= (TYPE_FLIP | TYPE_UNIFORM_SCALE);
295 }
296 } else if (m00 * m11 - m01 * m10 != 1.0) {
297 type |= (TYPE_GENERAL_ROTATION |
298 TYPE_FLIP |
299 TYPE_UNIFORM_SCALE);
300 } else {
301 type |= (TYPE_GENERAL_ROTATION | TYPE_FLIP);
302 }
303 }
304 }
305 return type;
306 }
307 }