Source Code Cross Referenced for CubicCurve2D.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.Rectangle;
023:        import java.awt.Shape;
024:        import java.util.NoSuchElementException;
025:
026:        import org.apache.harmony.awt.gl.Crossing;
027:        import org.apache.harmony.awt.internal.nls.Messages;
028:
029:        public abstract class CubicCurve2D implements  Shape, Cloneable {
030:
031:            public static class Float extends CubicCurve2D {
032:
033:                public float x1;
034:                public float y1;
035:                public float ctrlx1;
036:                public float ctrly1;
037:                public float ctrlx2;
038:                public float ctrly2;
039:                public float x2;
040:                public float y2;
041:
042:                public Float() {
043:                }
044:
045:                public Float(float x1, float y1, float ctrlx1, float ctrly1,
046:                        float ctrlx2, float ctrly2, float x2, float y2) {
047:                    setCurve(x1, y1, ctrlx1, ctrly1, ctrlx2, ctrly2, x2, y2);
048:                }
049:
050:                @Override
051:                public double getX1() {
052:                    return x1;
053:                }
054:
055:                @Override
056:                public double getY1() {
057:                    return y1;
058:                }
059:
060:                @Override
061:                public double getCtrlX1() {
062:                    return ctrlx1;
063:                }
064:
065:                @Override
066:                public double getCtrlY1() {
067:                    return ctrly1;
068:                }
069:
070:                @Override
071:                public double getCtrlX2() {
072:                    return ctrlx2;
073:                }
074:
075:                @Override
076:                public double getCtrlY2() {
077:                    return ctrly2;
078:                }
079:
080:                @Override
081:                public double getX2() {
082:                    return x2;
083:                }
084:
085:                @Override
086:                public double getY2() {
087:                    return y2;
088:                }
089:
090:                @Override
091:                public Point2D getP1() {
092:                    return new Point2D.Float(x1, y1);
093:                }
094:
095:                @Override
096:                public Point2D getCtrlP1() {
097:                    return new Point2D.Float(ctrlx1, ctrly1);
098:                }
099:
100:                @Override
101:                public Point2D getCtrlP2() {
102:                    return new Point2D.Float(ctrlx2, ctrly2);
103:                }
104:
105:                @Override
106:                public Point2D getP2() {
107:                    return new Point2D.Float(x2, y2);
108:                }
109:
110:                @Override
111:                public void setCurve(double x1, double y1, double ctrlx1,
112:                        double ctrly1, double ctrlx2, double ctrly2, double x2,
113:                        double y2) {
114:                    this .x1 = (float) x1;
115:                    this .y1 = (float) y1;
116:                    this .ctrlx1 = (float) ctrlx1;
117:                    this .ctrly1 = (float) ctrly1;
118:                    this .ctrlx2 = (float) ctrlx2;
119:                    this .ctrly2 = (float) ctrly2;
120:                    this .x2 = (float) x2;
121:                    this .y2 = (float) y2;
122:                }
123:
124:                public void setCurve(float x1, float y1, float ctrlx1,
125:                        float ctrly1, float ctrlx2, float ctrly2, float x2,
126:                        float y2) {
127:                    this .x1 = x1;
128:                    this .y1 = y1;
129:                    this .ctrlx1 = ctrlx1;
130:                    this .ctrly1 = ctrly1;
131:                    this .ctrlx2 = ctrlx2;
132:                    this .ctrly2 = ctrly2;
133:                    this .x2 = x2;
134:                    this .y2 = y2;
135:                }
136:
137:                public Rectangle2D getBounds2D() {
138:                    float rx1 = Math.min(Math.min(x1, x2), Math.min(ctrlx1,
139:                            ctrlx2));
140:                    float ry1 = Math.min(Math.min(y1, y2), Math.min(ctrly1,
141:                            ctrly2));
142:                    float rx2 = Math.max(Math.max(x1, x2), Math.max(ctrlx1,
143:                            ctrlx2));
144:                    float ry2 = Math.max(Math.max(y1, y2), Math.max(ctrly1,
145:                            ctrly2));
146:                    return new Rectangle2D.Float(rx1, ry1, rx2 - rx1, ry2 - ry1);
147:                }
148:            }
149:
150:            public static class Double extends CubicCurve2D {
151:
152:                public double x1;
153:                public double y1;
154:                public double ctrlx1;
155:                public double ctrly1;
156:                public double ctrlx2;
157:                public double ctrly2;
158:                public double x2;
159:                public double y2;
160:
161:                public Double() {
162:                }
163:
164:                public Double(double x1, double y1, double ctrlx1,
165:                        double ctrly1, double ctrlx2, double ctrly2, double x2,
166:                        double y2) {
167:                    setCurve(x1, y1, ctrlx1, ctrly1, ctrlx2, ctrly2, x2, y2);
168:                }
169:
170:                @Override
171:                public double getX1() {
172:                    return x1;
173:                }
174:
175:                @Override
176:                public double getY1() {
177:                    return y1;
178:                }
179:
180:                @Override
181:                public double getCtrlX1() {
182:                    return ctrlx1;
183:                }
184:
185:                @Override
186:                public double getCtrlY1() {
187:                    return ctrly1;
188:                }
189:
190:                @Override
191:                public double getCtrlX2() {
192:                    return ctrlx2;
193:                }
194:
195:                @Override
196:                public double getCtrlY2() {
197:                    return ctrly2;
198:                }
199:
200:                @Override
201:                public double getX2() {
202:                    return x2;
203:                }
204:
205:                @Override
206:                public double getY2() {
207:                    return y2;
208:                }
209:
210:                @Override
211:                public Point2D getP1() {
212:                    return new Point2D.Double(x1, y1);
213:                }
214:
215:                @Override
216:                public Point2D getCtrlP1() {
217:                    return new Point2D.Double(ctrlx1, ctrly1);
218:                }
219:
220:                @Override
221:                public Point2D getCtrlP2() {
222:                    return new Point2D.Double(ctrlx2, ctrly2);
223:                }
224:
225:                @Override
226:                public Point2D getP2() {
227:                    return new Point2D.Double(x2, y2);
228:                }
229:
230:                @Override
231:                public void setCurve(double x1, double y1, double ctrlx1,
232:                        double ctrly1, double ctrlx2, double ctrly2, double x2,
233:                        double y2) {
234:                    this .x1 = x1;
235:                    this .y1 = y1;
236:                    this .ctrlx1 = ctrlx1;
237:                    this .ctrly1 = ctrly1;
238:                    this .ctrlx2 = ctrlx2;
239:                    this .ctrly2 = ctrly2;
240:                    this .x2 = x2;
241:                    this .y2 = y2;
242:                }
243:
244:                public Rectangle2D getBounds2D() {
245:                    double rx1 = Math.min(Math.min(x1, x2), Math.min(ctrlx1,
246:                            ctrlx2));
247:                    double ry1 = Math.min(Math.min(y1, y2), Math.min(ctrly1,
248:                            ctrly2));
249:                    double rx2 = Math.max(Math.max(x1, x2), Math.max(ctrlx1,
250:                            ctrlx2));
251:                    double ry2 = Math.max(Math.max(y1, y2), Math.max(ctrly1,
252:                            ctrly2));
253:                    return new Rectangle2D.Double(rx1, ry1, rx2 - rx1, ry2
254:                            - ry1);
255:                }
256:            }
257:
258:            /*
259:             * CubicCurve2D path iterator 
260:             */
261:            class Iterator implements  PathIterator {
262:
263:                /**
264:                 * The source CubicCurve2D object
265:                 */
266:                CubicCurve2D c;
267:
268:                /**
269:                 * The path iterator transformation
270:                 */
271:                AffineTransform t;
272:
273:                /**
274:                 * The current segmenet index
275:                 */
276:                int index;
277:
278:                /**
279:                 * Constructs a new CubicCurve2D.Iterator for given line and transformation
280:                 * @param c - the source CubicCurve2D object
281:                 * @param at - the AffineTransform object to apply rectangle path
282:                 */
283:                Iterator(CubicCurve2D c, AffineTransform t) {
284:                    this .c = c;
285:                    this .t = t;
286:                }
287:
288:                public int getWindingRule() {
289:                    return WIND_NON_ZERO;
290:                }
291:
292:                public boolean isDone() {
293:                    return index > 1;
294:                }
295:
296:                public void next() {
297:                    index++;
298:                }
299:
300:                public int currentSegment(double[] coords) {
301:                    if (isDone()) {
302:                        throw new NoSuchElementException(Messages
303:                                .getString("awt.4B")); //$NON-NLS-1$
304:                    }
305:                    int type;
306:                    int count;
307:                    if (index == 0) {
308:                        type = SEG_MOVETO;
309:                        coords[0] = c.getX1();
310:                        coords[1] = c.getY1();
311:                        count = 1;
312:                    } else {
313:                        type = SEG_CUBICTO;
314:                        coords[0] = c.getCtrlX1();
315:                        coords[1] = c.getCtrlY1();
316:                        coords[2] = c.getCtrlX2();
317:                        coords[3] = c.getCtrlY2();
318:                        coords[4] = c.getX2();
319:                        coords[5] = c.getY2();
320:                        count = 3;
321:                    }
322:                    if (t != null) {
323:                        t.transform(coords, 0, coords, 0, count);
324:                    }
325:                    return type;
326:                }
327:
328:                public int currentSegment(float[] coords) {
329:                    if (isDone()) {
330:                        throw new NoSuchElementException(Messages
331:                                .getString("awt.4B")); //$NON-NLS-1$
332:                    }
333:                    int type;
334:                    int count;
335:                    if (index == 0) {
336:                        type = SEG_MOVETO;
337:                        coords[0] = (float) c.getX1();
338:                        coords[1] = (float) c.getY1();
339:                        count = 1;
340:                    } else {
341:                        type = SEG_CUBICTO;
342:                        coords[0] = (float) c.getCtrlX1();
343:                        coords[1] = (float) c.getCtrlY1();
344:                        coords[2] = (float) c.getCtrlX2();
345:                        coords[3] = (float) c.getCtrlY2();
346:                        coords[4] = (float) c.getX2();
347:                        coords[5] = (float) c.getY2();
348:                        count = 3;
349:                    }
350:                    if (t != null) {
351:                        t.transform(coords, 0, coords, 0, count);
352:                    }
353:                    return type;
354:                }
355:
356:            }
357:
358:            protected CubicCurve2D() {
359:            }
360:
361:            public abstract double getX1();
362:
363:            public abstract double getY1();
364:
365:            public abstract Point2D getP1();
366:
367:            public abstract double getCtrlX1();
368:
369:            public abstract double getCtrlY1();
370:
371:            public abstract Point2D getCtrlP1();
372:
373:            public abstract double getCtrlX2();
374:
375:            public abstract double getCtrlY2();
376:
377:            public abstract Point2D getCtrlP2();
378:
379:            public abstract double getX2();
380:
381:            public abstract double getY2();
382:
383:            public abstract Point2D getP2();
384:
385:            public abstract void setCurve(double x1, double y1, double ctrlx1,
386:                    double ctrly1, double ctrlx2, double ctrly2, double x2,
387:                    double y2);
388:
389:            public void setCurve(Point2D p1, Point2D cp1, Point2D cp2,
390:                    Point2D p2) {
391:                setCurve(p1.getX(), p1.getY(), cp1.getX(), cp1.getY(), cp2
392:                        .getX(), cp2.getY(), p2.getX(), p2.getY());
393:            }
394:
395:            public void setCurve(double[] coords, int offset) {
396:                setCurve(coords[offset + 0], coords[offset + 1],
397:                        coords[offset + 2], coords[offset + 3],
398:                        coords[offset + 4], coords[offset + 5],
399:                        coords[offset + 6], coords[offset + 7]);
400:            }
401:
402:            public void setCurve(Point2D[] points, int offset) {
403:                setCurve(points[offset + 0].getX(), points[offset + 0].getY(),
404:                        points[offset + 1].getX(), points[offset + 1].getY(),
405:                        points[offset + 2].getX(), points[offset + 2].getY(),
406:                        points[offset + 3].getX(), points[offset + 3].getY());
407:            }
408:
409:            public void setCurve(CubicCurve2D curve) {
410:                setCurve(curve.getX1(), curve.getY1(), curve.getCtrlX1(), curve
411:                        .getCtrlY1(), curve.getCtrlX2(), curve.getCtrlY2(),
412:                        curve.getX2(), curve.getY2());
413:            }
414:
415:            public double getFlatnessSq() {
416:                return getFlatnessSq(getX1(), getY1(), getCtrlX1(),
417:                        getCtrlY1(), getCtrlX2(), getCtrlY2(), getX2(), getY2());
418:            }
419:
420:            public static double getFlatnessSq(double x1, double y1,
421:                    double ctrlx1, double ctrly1, double ctrlx2, double ctrly2,
422:                    double x2, double y2) {
423:                return Math.max(Line2D.ptSegDistSq(x1, y1, x2, y2, ctrlx1,
424:                        ctrly1), Line2D.ptSegDistSq(x1, y1, x2, y2, ctrlx2,
425:                        ctrly2));
426:            }
427:
428:            public static double getFlatnessSq(double coords[], int offset) {
429:                return getFlatnessSq(coords[offset + 0], coords[offset + 1],
430:                        coords[offset + 2], coords[offset + 3],
431:                        coords[offset + 4], coords[offset + 5],
432:                        coords[offset + 6], coords[offset + 7]);
433:            }
434:
435:            public double getFlatness() {
436:                return getFlatness(getX1(), getY1(), getCtrlX1(), getCtrlY1(),
437:                        getCtrlX2(), getCtrlY2(), getX2(), getY2());
438:            }
439:
440:            public static double getFlatness(double x1, double y1,
441:                    double ctrlx1, double ctrly1, double ctrlx2, double ctrly2,
442:                    double x2, double y2) {
443:                return Math.sqrt(getFlatnessSq(x1, y1, ctrlx1, ctrly1, ctrlx2,
444:                        ctrly2, x2, y2));
445:            }
446:
447:            public static double getFlatness(double coords[], int offset) {
448:                return getFlatness(coords[offset + 0], coords[offset + 1],
449:                        coords[offset + 2], coords[offset + 3],
450:                        coords[offset + 4], coords[offset + 5],
451:                        coords[offset + 6], coords[offset + 7]);
452:            }
453:
454:            public void subdivide(CubicCurve2D left, CubicCurve2D right) {
455:                subdivide(this , left, right);
456:            }
457:
458:            public static void subdivide(CubicCurve2D src, CubicCurve2D left,
459:                    CubicCurve2D right) {
460:                double x1 = src.getX1();
461:                double y1 = src.getY1();
462:                double cx1 = src.getCtrlX1();
463:                double cy1 = src.getCtrlY1();
464:                double cx2 = src.getCtrlX2();
465:                double cy2 = src.getCtrlY2();
466:                double x2 = src.getX2();
467:                double y2 = src.getY2();
468:                double cx = (cx1 + cx2) / 2.0;
469:                double cy = (cy1 + cy2) / 2.0;
470:                cx1 = (x1 + cx1) / 2.0;
471:                cy1 = (y1 + cy1) / 2.0;
472:                cx2 = (x2 + cx2) / 2.0;
473:                cy2 = (y2 + cy2) / 2.0;
474:                double ax = (cx1 + cx) / 2.0;
475:                double ay = (cy1 + cy) / 2.0;
476:                double bx = (cx2 + cx) / 2.0;
477:                double by = (cy2 + cy) / 2.0;
478:                cx = (ax + bx) / 2.0;
479:                cy = (ay + by) / 2.0;
480:                if (left != null) {
481:                    left.setCurve(x1, y1, cx1, cy1, ax, ay, cx, cy);
482:                }
483:                if (right != null) {
484:                    right.setCurve(cx, cy, bx, by, cx2, cy2, x2, y2);
485:                }
486:            }
487:
488:            public static void subdivide(double src[], int srcOff,
489:                    double left[], int leftOff, double right[], int rightOff) {
490:                double x1 = src[srcOff + 0];
491:                double y1 = src[srcOff + 1];
492:                double cx1 = src[srcOff + 2];
493:                double cy1 = src[srcOff + 3];
494:                double cx2 = src[srcOff + 4];
495:                double cy2 = src[srcOff + 5];
496:                double x2 = src[srcOff + 6];
497:                double y2 = src[srcOff + 7];
498:                double cx = (cx1 + cx2) / 2.0;
499:                double cy = (cy1 + cy2) / 2.0;
500:                cx1 = (x1 + cx1) / 2.0;
501:                cy1 = (y1 + cy1) / 2.0;
502:                cx2 = (x2 + cx2) / 2.0;
503:                cy2 = (y2 + cy2) / 2.0;
504:                double ax = (cx1 + cx) / 2.0;
505:                double ay = (cy1 + cy) / 2.0;
506:                double bx = (cx2 + cx) / 2.0;
507:                double by = (cy2 + cy) / 2.0;
508:                cx = (ax + bx) / 2.0;
509:                cy = (ay + by) / 2.0;
510:                if (left != null) {
511:                    left[leftOff + 0] = x1;
512:                    left[leftOff + 1] = y1;
513:                    left[leftOff + 2] = cx1;
514:                    left[leftOff + 3] = cy1;
515:                    left[leftOff + 4] = ax;
516:                    left[leftOff + 5] = ay;
517:                    left[leftOff + 6] = cx;
518:                    left[leftOff + 7] = cy;
519:                }
520:                if (right != null) {
521:                    right[rightOff + 0] = cx;
522:                    right[rightOff + 1] = cy;
523:                    right[rightOff + 2] = bx;
524:                    right[rightOff + 3] = by;
525:                    right[rightOff + 4] = cx2;
526:                    right[rightOff + 5] = cy2;
527:                    right[rightOff + 6] = x2;
528:                    right[rightOff + 7] = y2;
529:                }
530:            }
531:
532:            public static int solveCubic(double eqn[]) {
533:                return solveCubic(eqn, eqn);
534:            }
535:
536:            public static int solveCubic(double eqn[], double res[]) {
537:                return Crossing.solveCubic(eqn, res);
538:            }
539:
540:            public boolean contains(double px, double py) {
541:                return Crossing.isInsideEvenOdd(Crossing.crossShape(this , px,
542:                        py));
543:            }
544:
545:            public boolean contains(double rx, double ry, double rw, double rh) {
546:                int cross = Crossing.intersectShape(this , rx, ry, rw, rh);
547:                return cross != Crossing.CROSSING
548:                        && Crossing.isInsideEvenOdd(cross);
549:            }
550:
551:            public boolean intersects(double rx, double ry, double rw, double rh) {
552:                int cross = Crossing.intersectShape(this , rx, ry, rw, rh);
553:                return cross == Crossing.CROSSING
554:                        || Crossing.isInsideEvenOdd(cross);
555:            }
556:
557:            public boolean contains(Point2D p) {
558:                return contains(p.getX(), p.getY());
559:            }
560:
561:            public boolean intersects(Rectangle2D r) {
562:                return intersects(r.getX(), r.getY(), r.getWidth(), r
563:                        .getHeight());
564:            }
565:
566:            public boolean contains(Rectangle2D r) {
567:                return contains(r.getX(), r.getY(), r.getWidth(), r.getHeight());
568:            }
569:
570:            public Rectangle getBounds() {
571:                return getBounds2D().getBounds();
572:            }
573:
574:            public PathIterator getPathIterator(AffineTransform t) {
575:                return new Iterator(this , t);
576:            }
577:
578:            public PathIterator getPathIterator(AffineTransform at,
579:                    double flatness) {
580:                return new FlatteningPathIterator(getPathIterator(at), flatness);
581:            }
582:
583:            @Override
584:            public Object clone() {
585:                try {
586:                    return super .clone();
587:                } catch (CloneNotSupportedException e) {
588:                    throw new InternalError();
589:                }
590:            }
591:        }
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