Source Code Cross Referenced for AffineTransform.java in  » Apache-Harmony-Java-SE » java-package » java » awt » geom » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.awt.geom 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         */
017:        /**
018:         * @author Denis M. Kishenko
019:         * @version $Revision$
020:         */package java.awt.geom;
021:
022:        import java.awt.Shape;
023:        import java.io.IOException;
024:        import java.io.Serializable;
025:
026:        import org.apache.harmony.awt.internal.nls.Messages;
027:        import org.apache.harmony.misc.HashCode;
028:
029:        public class AffineTransform implements  Cloneable, Serializable {
030:
031:            private static final long serialVersionUID = 1330973210523860834L;
032:
033:            public static final int TYPE_IDENTITY = 0;
034:            public static final int TYPE_TRANSLATION = 1;
035:            public static final int TYPE_UNIFORM_SCALE = 2;
036:            public static final int TYPE_GENERAL_SCALE = 4;
037:            public static final int TYPE_QUADRANT_ROTATION = 8;
038:            public static final int TYPE_GENERAL_ROTATION = 16;
039:            public static final int TYPE_GENERAL_TRANSFORM = 32;
040:            public static final int TYPE_FLIP = 64;
041:            public static final int TYPE_MASK_SCALE = TYPE_UNIFORM_SCALE
042:                    | TYPE_GENERAL_SCALE;
043:            public static final int TYPE_MASK_ROTATION = TYPE_QUADRANT_ROTATION
044:                    | TYPE_GENERAL_ROTATION;
045:
046:            /**
047:             * The <code>TYPE_UNKNOWN</code> is an initial type value
048:             */
049:            static final int TYPE_UNKNOWN = -1;
050:
051:            /**
052:             * The min value equivalent to zero. If absolute value less then ZERO it considered as zero.  
053:             */
054:            static final double ZERO = 1E-10;
055:
056:            /**
057:             * The values of transformation matrix
058:             */
059:            double m00;
060:            double m10;
061:            double m01;
062:            double m11;
063:            double m02;
064:            double m12;
065:
066:            /**
067:             * The transformation <code>type</code> 
068:             */
069:            transient int type;
070:
071:            public AffineTransform() {
072:                type = TYPE_IDENTITY;
073:                m00 = m11 = 1.0;
074:                m10 = m01 = m02 = m12 = 0.0;
075:            }
076:
077:            public AffineTransform(AffineTransform t) {
078:                this .type = t.type;
079:                this .m00 = t.m00;
080:                this .m10 = t.m10;
081:                this .m01 = t.m01;
082:                this .m11 = t.m11;
083:                this .m02 = t.m02;
084:                this .m12 = t.m12;
085:            }
086:
087:            public AffineTransform(float m00, float m10, float m01, float m11,
088:                    float m02, float m12) {
089:                this .type = TYPE_UNKNOWN;
090:                this .m00 = m00;
091:                this .m10 = m10;
092:                this .m01 = m01;
093:                this .m11 = m11;
094:                this .m02 = m02;
095:                this .m12 = m12;
096:            }
097:
098:            public AffineTransform(double m00, double m10, double m01,
099:                    double m11, double m02, double m12) {
100:                this .type = TYPE_UNKNOWN;
101:                this .m00 = m00;
102:                this .m10 = m10;
103:                this .m01 = m01;
104:                this .m11 = m11;
105:                this .m02 = m02;
106:                this .m12 = m12;
107:            }
108:
109:            public AffineTransform(float[] matrix) {
110:                this .type = TYPE_UNKNOWN;
111:                m00 = matrix[0];
112:                m10 = matrix[1];
113:                m01 = matrix[2];
114:                m11 = matrix[3];
115:                if (matrix.length > 4) {
116:                    m02 = matrix[4];
117:                    m12 = matrix[5];
118:                }
119:            }
120:
121:            public AffineTransform(double[] matrix) {
122:                this .type = TYPE_UNKNOWN;
123:                m00 = matrix[0];
124:                m10 = matrix[1];
125:                m01 = matrix[2];
126:                m11 = matrix[3];
127:                if (matrix.length > 4) {
128:                    m02 = matrix[4];
129:                    m12 = matrix[5];
130:                }
131:            }
132:
133:            /*
134:             * Method returns type of affine transformation.
135:             * 
136:             * Transform matrix is
137:             *   m00 m01 m02
138:             *   m10 m11 m12
139:             * 
140:             * According analytic geometry new basis vectors are (m00, m01) and (m10, m11), 
141:             * translation vector is (m02, m12). Original basis vectors are (1, 0) and (0, 1). 
142:             * Type transformations classification:  
143:             *   TYPE_IDENTITY - new basis equals original one and zero translation
144:             *   TYPE_TRANSLATION - translation vector isn't zero  
145:             *   TYPE_UNIFORM_SCALE - vectors length of new basis equals
146:             *   TYPE_GENERAL_SCALE - vectors length of new basis doesn't equal 
147:             *   TYPE_FLIP - new basis vector orientation differ from original one
148:             *   TYPE_QUADRANT_ROTATION - new basis is rotated by 90, 180, 270, or 360 degrees     
149:             *   TYPE_GENERAL_ROTATION - new basis is rotated by arbitrary angle
150:             *   TYPE_GENERAL_TRANSFORM - transformation can't be inversed
151:             */
152:            public int getType() {
153:                if (type != TYPE_UNKNOWN) {
154:                    return type;
155:                }
156:
157:                int type = 0;
158:
159:                if (m00 * m01 + m10 * m11 != 0.0) {
160:                    type |= TYPE_GENERAL_TRANSFORM;
161:                    return type;
162:                }
163:
164:                if (m02 != 0.0 || m12 != 0.0) {
165:                    type |= TYPE_TRANSLATION;
166:                } else if (m00 == 1.0 && m11 == 1.0 && m01 == 0.0 && m10 == 0.0) {
167:                    type = TYPE_IDENTITY;
168:                    return type;
169:                }
170:
171:                if (m00 * m11 - m01 * m10 < 0.0) {
172:                    type |= TYPE_FLIP;
173:                }
174:
175:                double dx = m00 * m00 + m10 * m10;
176:                double dy = m01 * m01 + m11 * m11;
177:                if (dx != dy) {
178:                    type |= TYPE_GENERAL_SCALE;
179:                } else if (dx != 1.0) {
180:                    type |= TYPE_UNIFORM_SCALE;
181:                }
182:
183:                if ((m00 == 0.0 && m11 == 0.0)
184:                        || (m10 == 0.0 && m01 == 0.0 && (m00 < 0.0 || m11 < 0.0))) {
185:                    type |= TYPE_QUADRANT_ROTATION;
186:                } else if (m01 != 0.0 || m10 != 0.0) {
187:                    type |= TYPE_GENERAL_ROTATION;
188:                }
189:
190:                return type;
191:            }
192:
193:            public double getScaleX() {
194:                return m00;
195:            }
196:
197:            public double getScaleY() {
198:                return m11;
199:            }
200:
201:            public double getShearX() {
202:                return m01;
203:            }
204:
205:            public double getShearY() {
206:                return m10;
207:            }
208:
209:            public double getTranslateX() {
210:                return m02;
211:            }
212:
213:            public double getTranslateY() {
214:                return m12;
215:            }
216:
217:            public boolean isIdentity() {
218:                return getType() == TYPE_IDENTITY;
219:            }
220:
221:            public void getMatrix(double[] matrix) {
222:                matrix[0] = m00;
223:                matrix[1] = m10;
224:                matrix[2] = m01;
225:                matrix[3] = m11;
226:                if (matrix.length > 4) {
227:                    matrix[4] = m02;
228:                    matrix[5] = m12;
229:                }
230:            }
231:
232:            public double getDeterminant() {
233:                return m00 * m11 - m01 * m10;
234:            }
235:
236:            public void setTransform(double m00, double m10, double m01,
237:                    double m11, double m02, double m12) {
238:                this .type = TYPE_UNKNOWN;
239:                this .m00 = m00;
240:                this .m10 = m10;
241:                this .m01 = m01;
242:                this .m11 = m11;
243:                this .m02 = m02;
244:                this .m12 = m12;
245:            }
246:
247:            public void setTransform(AffineTransform t) {
248:                type = t.type;
249:                setTransform(t.m00, t.m10, t.m01, t.m11, t.m02, t.m12);
250:            }
251:
252:            public void setToIdentity() {
253:                type = TYPE_IDENTITY;
254:                m00 = m11 = 1.0;
255:                m10 = m01 = m02 = m12 = 0.0;
256:            }
257:
258:            public void setToTranslation(double mx, double my) {
259:                m00 = m11 = 1.0;
260:                m01 = m10 = 0.0;
261:                m02 = mx;
262:                m12 = my;
263:                if (mx == 0.0 && my == 0.0) {
264:                    type = TYPE_IDENTITY;
265:                } else {
266:                    type = TYPE_TRANSLATION;
267:                }
268:            }
269:
270:            public void setToScale(double scx, double scy) {
271:                m00 = scx;
272:                m11 = scy;
273:                m10 = m01 = m02 = m12 = 0.0;
274:                if (scx != 1.0 || scy != 1.0) {
275:                    type = TYPE_UNKNOWN;
276:                } else {
277:                    type = TYPE_IDENTITY;
278:                }
279:            }
280:
281:            public void setToShear(double shx, double shy) {
282:                m00 = m11 = 1.0;
283:                m02 = m12 = 0.0;
284:                m01 = shx;
285:                m10 = shy;
286:                if (shx != 0.0 || shy != 0.0) {
287:                    type = TYPE_UNKNOWN;
288:                } else {
289:                    type = TYPE_IDENTITY;
290:                }
291:            }
292:
293:            public void setToRotation(double angle) {
294:                double sin = Math.sin(angle);
295:                double cos = Math.cos(angle);
296:                if (Math.abs(cos) < ZERO) {
297:                    cos = 0.0;
298:                    sin = sin > 0.0 ? 1.0 : -1.0;
299:                } else if (Math.abs(sin) < ZERO) {
300:                    sin = 0.0;
301:                    cos = cos > 0.0 ? 1.0 : -1.0;
302:                }
303:                m00 = m11 = cos;
304:                m01 = -sin;
305:                m10 = sin;
306:                m02 = m12 = 0.0;
307:                type = TYPE_UNKNOWN;
308:            }
309:
310:            public void setToRotation(double angle, double px, double py) {
311:                setToRotation(angle);
312:                m02 = px * (1.0 - m00) + py * m10;
313:                m12 = py * (1.0 - m00) - px * m10;
314:                type = TYPE_UNKNOWN;
315:            }
316:
317:            public static AffineTransform getTranslateInstance(double mx,
318:                    double my) {
319:                AffineTransform t = new AffineTransform();
320:                t.setToTranslation(mx, my);
321:                return t;
322:            }
323:
324:            public static AffineTransform getScaleInstance(double scx,
325:                    double scY) {
326:                AffineTransform t = new AffineTransform();
327:                t.setToScale(scx, scY);
328:                return t;
329:            }
330:
331:            public static AffineTransform getShearInstance(double shx,
332:                    double shy) {
333:                AffineTransform m = new AffineTransform();
334:                m.setToShear(shx, shy);
335:                return m;
336:            }
337:
338:            public static AffineTransform getRotateInstance(double angle) {
339:                AffineTransform t = new AffineTransform();
340:                t.setToRotation(angle);
341:                return t;
342:            }
343:
344:            public static AffineTransform getRotateInstance(double angle,
345:                    double x, double y) {
346:                AffineTransform t = new AffineTransform();
347:                t.setToRotation(angle, x, y);
348:                return t;
349:            }
350:
351:            public void translate(double mx, double my) {
352:                concatenate(AffineTransform.getTranslateInstance(mx, my));
353:            }
354:
355:            public void scale(double scx, double scy) {
356:                concatenate(AffineTransform.getScaleInstance(scx, scy));
357:            }
358:
359:            public void shear(double shx, double shy) {
360:                concatenate(AffineTransform.getShearInstance(shx, shy));
361:            }
362:
363:            public void rotate(double angle) {
364:                concatenate(AffineTransform.getRotateInstance(angle));
365:            }
366:
367:            public void rotate(double angle, double px, double py) {
368:                concatenate(AffineTransform.getRotateInstance(angle, px, py));
369:            }
370:
371:            /** 
372:             * Multiply matrix of two AffineTransform objects 
373:             * @param t1 - the AffineTransform object is a multiplicand
374:             * @param t2 - the AffineTransform object is a multiplier
375:             * @return an AffineTransform object that is a result of t1 multiplied by matrix t2. 
376:             */
377:            AffineTransform multiply(AffineTransform t1, AffineTransform t2) {
378:                return new AffineTransform(t1.m00 * t2.m00 + t1.m10 * t2.m01, // m00
379:                        t1.m00 * t2.m10 + t1.m10 * t2.m11, // m01
380:                        t1.m01 * t2.m00 + t1.m11 * t2.m01, // m10
381:                        t1.m01 * t2.m10 + t1.m11 * t2.m11, // m11
382:                        t1.m02 * t2.m00 + t1.m12 * t2.m01 + t2.m02, // m02
383:                        t1.m02 * t2.m10 + t1.m12 * t2.m11 + t2.m12);// m12
384:            }
385:
386:            public void concatenate(AffineTransform t) {
387:                setTransform(multiply(t, this ));
388:            }
389:
390:            public void preConcatenate(AffineTransform t) {
391:                setTransform(multiply(this , t));
392:            }
393:
394:            public AffineTransform createInverse()
395:                    throws NoninvertibleTransformException {
396:                double det = getDeterminant();
397:                if (Math.abs(det) < ZERO) {
398:                    // awt.204=Determinant is zero
399:                    throw new NoninvertibleTransformException(Messages
400:                            .getString("awt.204")); //$NON-NLS-1$
401:                }
402:                return new AffineTransform(m11 / det, // m00
403:                        -m10 / det, // m10
404:                        -m01 / det, // m01
405:                        m00 / det, // m11
406:                        (m01 * m12 - m11 * m02) / det, // m02
407:                        (m10 * m02 - m00 * m12) / det // m12
408:                );
409:            }
410:
411:            public Point2D transform(Point2D src, Point2D dst) {
412:                if (dst == null) {
413:                    if (src instanceof  Point2D.Double) {
414:                        dst = new Point2D.Double();
415:                    } else {
416:                        dst = new Point2D.Float();
417:                    }
418:                }
419:
420:                double x = src.getX();
421:                double y = src.getY();
422:
423:                dst.setLocation(x * m00 + y * m01 + m02, x * m10 + y * m11
424:                        + m12);
425:                return dst;
426:            }
427:
428:            public void transform(Point2D[] src, int srcOff, Point2D[] dst,
429:                    int dstOff, int length) {
430:                while (--length >= 0) {
431:                    Point2D srcPoint = src[srcOff++];
432:                    double x = srcPoint.getX();
433:                    double y = srcPoint.getY();
434:                    Point2D dstPoint = dst[dstOff];
435:                    if (dstPoint == null) {
436:                        if (srcPoint instanceof  Point2D.Double) {
437:                            dstPoint = new Point2D.Double();
438:                        } else {
439:                            dstPoint = new Point2D.Float();
440:                        }
441:                    }
442:                    dstPoint.setLocation(x * m00 + y * m01 + m02, x * m10 + y
443:                            * m11 + m12);
444:                    dst[dstOff++] = dstPoint;
445:                }
446:            }
447:
448:            public void transform(double[] src, int srcOff, double[] dst,
449:                    int dstOff, int length) {
450:                int step = 2;
451:                if (src == dst && srcOff < dstOff
452:                        && dstOff < srcOff + length * 2) {
453:                    srcOff = srcOff + length * 2 - 2;
454:                    dstOff = dstOff + length * 2 - 2;
455:                    step = -2;
456:                }
457:                while (--length >= 0) {
458:                    double x = src[srcOff + 0];
459:                    double y = src[srcOff + 1];
460:                    dst[dstOff + 0] = x * m00 + y * m01 + m02;
461:                    dst[dstOff + 1] = x * m10 + y * m11 + m12;
462:                    srcOff += step;
463:                    dstOff += step;
464:                }
465:            }
466:
467:            public void transform(float[] src, int srcOff, float[] dst,
468:                    int dstOff, int length) {
469:                int step = 2;
470:                if (src == dst && srcOff < dstOff
471:                        && dstOff < srcOff + length * 2) {
472:                    srcOff = srcOff + length * 2 - 2;
473:                    dstOff = dstOff + length * 2 - 2;
474:                    step = -2;
475:                }
476:                while (--length >= 0) {
477:                    float x = src[srcOff + 0];
478:                    float y = src[srcOff + 1];
479:                    dst[dstOff + 0] = (float) (x * m00 + y * m01 + m02);
480:                    dst[dstOff + 1] = (float) (x * m10 + y * m11 + m12);
481:                    srcOff += step;
482:                    dstOff += step;
483:                }
484:            }
485:
486:            public void transform(float[] src, int srcOff, double[] dst,
487:                    int dstOff, int length) {
488:                while (--length >= 0) {
489:                    float x = src[srcOff++];
490:                    float y = src[srcOff++];
491:                    dst[dstOff++] = x * m00 + y * m01 + m02;
492:                    dst[dstOff++] = x * m10 + y * m11 + m12;
493:                }
494:            }
495:
496:            public void transform(double[] src, int srcOff, float[] dst,
497:                    int dstOff, int length) {
498:                while (--length >= 0) {
499:                    double x = src[srcOff++];
500:                    double y = src[srcOff++];
501:                    dst[dstOff++] = (float) (x * m00 + y * m01 + m02);
502:                    dst[dstOff++] = (float) (x * m10 + y * m11 + m12);
503:                }
504:            }
505:
506:            public Point2D deltaTransform(Point2D src, Point2D dst) {
507:                if (dst == null) {
508:                    if (dst instanceof  Point2D.Double) {
509:                        dst = new Point2D.Double();
510:                    } else {
511:                        dst = new Point2D.Float();
512:                    }
513:                }
514:
515:                double x = src.getX();
516:                double y = src.getY();
517:
518:                dst.setLocation(x * m00 + y * m01, x * m10 + y * m11);
519:                return dst;
520:            }
521:
522:            public void deltaTransform(double[] src, int srcOff, double[] dst,
523:                    int dstOff, int length) {
524:                while (--length >= 0) {
525:                    double x = src[srcOff++];
526:                    double y = src[srcOff++];
527:                    dst[dstOff++] = x * m00 + y * m01;
528:                    dst[dstOff++] = x * m10 + y * m11;
529:                }
530:            }
531:
532:            public Point2D inverseTransform(Point2D src, Point2D dst)
533:                    throws NoninvertibleTransformException {
534:                double det = getDeterminant();
535:                if (Math.abs(det) < ZERO) {
536:                    // awt.204=Determinant is zero
537:                    throw new NoninvertibleTransformException(Messages
538:                            .getString("awt.204")); //$NON-NLS-1$
539:                }
540:
541:                if (dst == null) {
542:                    if (src instanceof  Point2D.Double) {
543:                        dst = new Point2D.Double();
544:                    } else {
545:                        dst = new Point2D.Float();
546:                    }
547:                }
548:
549:                double x = src.getX() - m02;
550:                double y = src.getY() - m12;
551:
552:                dst.setLocation((x * m11 - y * m01) / det, (y * m00 - x * m10)
553:                        / det);
554:                return dst;
555:            }
556:
557:            public void inverseTransform(double[] src, int srcOff,
558:                    double[] dst, int dstOff, int length)
559:                    throws NoninvertibleTransformException {
560:                double det = getDeterminant();
561:                if (Math.abs(det) < ZERO) {
562:                    // awt.204=Determinant is zero
563:                    throw new NoninvertibleTransformException(Messages
564:                            .getString("awt.204")); //$NON-NLS-1$
565:                }
566:
567:                while (--length >= 0) {
568:                    double x = src[srcOff++] - m02;
569:                    double y = src[srcOff++] - m12;
570:                    dst[dstOff++] = (x * m11 - y * m01) / det;
571:                    dst[dstOff++] = (y * m00 - x * m10) / det;
572:                }
573:            }
574:
575:            public Shape createTransformedShape(Shape src) {
576:                if (src == null) {
577:                    return null;
578:                }
579:                if (src instanceof  GeneralPath) {
580:                    return ((GeneralPath) src).createTransformedShape(this );
581:                }
582:                PathIterator path = src.getPathIterator(this );
583:                GeneralPath dst = new GeneralPath(path.getWindingRule());
584:                dst.append(path, false);
585:                return dst;
586:            }
587:
588:            @Override
589:            public String toString() {
590:                return getClass().getName()
591:                        + "[[" + m00 + ", " + m01 + ", " + m02 + "], [" //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
592:                        + m10 + ", " + m11 + ", " + m12 + "]]"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
593:            }
594:
595:            @Override
596:            public Object clone() {
597:                try {
598:                    return super .clone();
599:                } catch (CloneNotSupportedException e) {
600:                    throw new InternalError();
601:                }
602:            }
603:
604:            @Override
605:            public int hashCode() {
606:                HashCode hash = new HashCode();
607:                hash.append(m00);
608:                hash.append(m01);
609:                hash.append(m02);
610:                hash.append(m10);
611:                hash.append(m11);
612:                hash.append(m12);
613:                return hash.hashCode();
614:            }
615:
616:            @Override
617:            public boolean equals(Object obj) {
618:                if (obj == this ) {
619:                    return true;
620:                }
621:                if (obj instanceof  AffineTransform) {
622:                    AffineTransform t = (AffineTransform) obj;
623:                    return m00 == t.m00 && m01 == t.m01 && m02 == t.m02
624:                            && m10 == t.m10 && m11 == t.m11 && m12 == t.m12;
625:                }
626:                return false;
627:            }
628:
629:            /**
630:             * Write AffineTrasform object to the output steam.
631:             * @param stream - the output stream
632:             * @throws IOException - if there are I/O errors while writing to the output strem
633:             */
634:            private void writeObject(java.io.ObjectOutputStream stream)
635:                    throws IOException {
636:                stream.defaultWriteObject();
637:            }
638:
639:            /**
640:             * Read AffineTransform object from the input stream
641:             * @param stream - the input steam
642:             * @throws IOException - if there are I/O errors while reading from the input strem
643:             * @throws ClassNotFoundException - if class could not be found 
644:             */
645:            private void readObject(java.io.ObjectInputStream stream)
646:                    throws IOException, ClassNotFoundException {
647:                stream.defaultReadObject();
648:                type = TYPE_UNKNOWN;
649:            }
650:
651:        }
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