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Diffstat (limited to 'turtle2d/src/jogamp/graph/geom/plane/Path2D.java')
| -rw-r--r-- | turtle2d/src/jogamp/graph/geom/plane/Path2D.java | 428 |
1 files changed, 428 insertions, 0 deletions
diff --git a/turtle2d/src/jogamp/graph/geom/plane/Path2D.java b/turtle2d/src/jogamp/graph/geom/plane/Path2D.java new file mode 100644 index 000000000..431891361 --- /dev/null +++ b/turtle2d/src/jogamp/graph/geom/plane/Path2D.java @@ -0,0 +1,428 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +/** + * @author Denis M. Kishenko + */ +package jogamp.graph.geom.plane; + +import java.util.NoSuchElementException; + +import com.jogamp.graph.geom.AABBox; +import com.jogamp.graph.geom.Vertex; +import com.jogamp.graph.geom.opengl.SVertex; + +import jogamp.graph.math.plane.Crossing; + +public final class Path2D implements Cloneable { + + public static final int WIND_EVEN_ODD = PathIterator.WIND_EVEN_ODD; + public static final int WIND_NON_ZERO = PathIterator.WIND_NON_ZERO; + + static final String invalidWindingRuleValue = "Invalid winding rule value"; + static final String iteratorOutOfBounds = "Iterator out of bounds"; + + /** + * The buffers size + */ + private static final int BUFFER_SIZE = 10; + + /** + * The buffers capacity + */ + private static final int BUFFER_CAPACITY = 10; + + /** + * The point's types buffer + */ + byte[] types; + + /** + * The points buffer + */ + float[] points; + + /** + * The point's type buffer size + */ + int typeSize; + + /** + * The points buffer size + */ + int pointSize; + + /** + * The path rule + */ + int rule; + + /** + * The space amount in points buffer for different segmenet's types + */ + static int pointShift[] = { + 2, // MOVETO + 2, // LINETO + 4, // QUADTO + 6, // CUBICTO + 0}; // CLOSE + + /* + * GeneralPath path iterator + */ + class Iterator implements PathIterator { + + /** + * The current cursor position in types buffer + */ + int typeIndex; + + /** + * The current cursor position in points buffer + */ + int pointIndex; + + /** + * The source GeneralPath object + */ + Path2D p; + + /** + * The path iterator transformation + */ + AffineTransform t; + + /** + * Constructs a new GeneralPath.Iterator for given general path + * @param path - the source GeneralPath object + */ + Iterator(Path2D path) { + this(path, null); + } + + /** + * Constructs a new GeneralPath.Iterator for given general path and transformation + * @param path - the source GeneralPath object + * @param at - the AffineTransform object to apply rectangle path + */ + Iterator(Path2D path, AffineTransform at) { + this.p = path; + this.t = at; + } + + public int getWindingRule() { + return p.getWindingRule(); + } + + public boolean isDone() { + return typeIndex >= p.typeSize; + } + + public void next() { + typeIndex++; + } + + public int currentSegment(float[] coords) { + if (isDone()) { + throw new NoSuchElementException(iteratorOutOfBounds); + } + int type = p.types[typeIndex]; + int count = Path2D.pointShift[type]; + System.arraycopy(p.points, pointIndex, coords, 0, count); + if (t != null) { + t.transform(coords, 0, coords, 0, count / 2); + } + pointIndex += count; + return type; + } + + } + + public Path2D() { + this(WIND_NON_ZERO, BUFFER_SIZE); + } + + public Path2D(int rule) { + this(rule, BUFFER_SIZE); + } + + public Path2D(int rule, int initialCapacity) { + setWindingRule(rule); + types = new byte[initialCapacity]; + points = new float[initialCapacity * 2]; + } + + public Path2D(Path2D path) { + this(WIND_NON_ZERO, BUFFER_SIZE); + PathIterator p = path.iterator(null); + setWindingRule(p.getWindingRule()); + append(p, false); + } + + public void setWindingRule(int rule) { + if (rule != WIND_EVEN_ODD && rule != WIND_NON_ZERO) { + throw new NoSuchElementException(invalidWindingRuleValue); + } + this.rule = rule; + } + + public int getWindingRule() { + return rule; + } + + /** + * Checks points and types buffer size to add pointCount points. If necessary realloc buffers to enlarge size. + * @param pointCount - the point count to be added in buffer + */ + void checkBuf(int pointCount, boolean checkMove) { + if (checkMove && typeSize == 0) { + throw new IllegalPathStateException("First segment should be SEG_MOVETO type"); + } + if (typeSize == types.length) { + byte tmp[] = new byte[typeSize + BUFFER_CAPACITY]; + System.arraycopy(types, 0, tmp, 0, typeSize); + types = tmp; + } + if (pointSize + pointCount > points.length) { + float tmp[] = new float[pointSize + Math.max(BUFFER_CAPACITY * 2, pointCount)]; + System.arraycopy(points, 0, tmp, 0, pointSize); + points = tmp; + } + } + + public void moveTo(float x, float y) { + if (typeSize > 0 && types[typeSize - 1] == PathIterator.SEG_MOVETO) { + points[pointSize - 2] = x; + points[pointSize - 1] = y; + } else { + checkBuf(2, false); + types[typeSize++] = PathIterator.SEG_MOVETO; + points[pointSize++] = x; + points[pointSize++] = y; + } + } + + public void lineTo(float x, float y) { + checkBuf(2, true); + types[typeSize++] = PathIterator.SEG_LINETO; + points[pointSize++] = x; + points[pointSize++] = y; + } + + public void quadTo(float x1, float y1, float x2, float y2) { + checkBuf(4, true); + types[typeSize++] = PathIterator.SEG_QUADTO; + points[pointSize++] = x1; + points[pointSize++] = y1; + points[pointSize++] = x2; + points[pointSize++] = y2; + } + + public void curveTo(float x1, float y1, float x2, float y2, float x3, float y3) { + checkBuf(6, true); + types[typeSize++] = PathIterator.SEG_CUBICTO; + points[pointSize++] = x1; + points[pointSize++] = y1; + points[pointSize++] = x2; + points[pointSize++] = y2; + points[pointSize++] = x3; + points[pointSize++] = y3; + } + + final public int size() { + return typeSize; + } + + final public boolean isClosed() { + return typeSize > 0 && types[typeSize - 1] == PathIterator.SEG_CLOSE ; + } + + public void closePath() { + if (!isClosed()) { + checkBuf(0, true); + types[typeSize++] = PathIterator.SEG_CLOSE; + } + } + + public String toString() { + return "[size "+size()+", closed "+isClosed()+"]"; + } + + public void append(Path2D path, boolean connect) { + PathIterator p = path.iterator(null); + append(p, connect); + } + + public void append(PathIterator path, boolean connect) { + while (!path.isDone()) { + float coords[] = new float[6]; + switch (path.currentSegment(coords)) { + case PathIterator.SEG_MOVETO: + if (!connect || typeSize == 0) { + moveTo(coords[0], coords[1]); + break; + } + if (types[typeSize - 1] != PathIterator.SEG_CLOSE && + points[pointSize - 2] == coords[0] && + points[pointSize - 1] == coords[1]) + { + break; + } + // NO BREAK; + case PathIterator.SEG_LINETO: + lineTo(coords[0], coords[1]); + break; + case PathIterator.SEG_QUADTO: + quadTo(coords[0], coords[1], coords[2], coords[3]); + break; + case PathIterator.SEG_CUBICTO: + curveTo(coords[0], coords[1], coords[2], coords[3], coords[4], coords[5]); + break; + case PathIterator.SEG_CLOSE: + closePath(); + break; + } + path.next(); + connect = false; + } + } + + public SVertex getCurrentPoint() { + if (typeSize == 0) { + return null; + } + int j = pointSize - 2; + if (types[typeSize - 1] == PathIterator.SEG_CLOSE) { + + for (int i = typeSize - 2; i > 0; i--) { + int type = types[i]; + if (type == PathIterator.SEG_MOVETO) { + break; + } + j -= pointShift[type]; + } + } + return new SVertex(points[j], points[j + 1]); + } + + public void reset() { + typeSize = 0; + pointSize = 0; + } + + public void transform(AffineTransform t) { + t.transform(points, 0, points, 0, pointSize / 2); + } + + public Path2D createTransformedShape(AffineTransform t) { + Path2D p = (Path2D)clone(); + if (t != null) { + p.transform(t); + } + return p; + } + + public final synchronized AABBox getBounds2D() { + float rx1, ry1, rx2, ry2; + if (pointSize == 0) { + rx1 = ry1 = rx2 = ry2 = 0.0f; + } else { + int i = pointSize - 1; + ry1 = ry2 = points[i--]; + rx1 = rx2 = points[i--]; + while (i > 0) { + float y = points[i--]; + float x = points[i--]; + if (x < rx1) { + rx1 = x; + } else + if (x > rx2) { + rx2 = x; + } + if (y < ry1) { + ry1 = y; + } else + if (y > ry2) { + ry2 = y; + } + } + } + return new AABBox(rx1, ry1, 0f, rx2, ry2, 0f); + } + + /** + * Checks cross count according to path rule to define is it point inside shape or not. + * @param cross - the point cross count + * @return true if point is inside path, or false otherwise + */ + boolean isInside(int cross) { + if (rule == WIND_NON_ZERO) { + return Crossing.isInsideNonZero(cross); + } + return Crossing.isInsideEvenOdd(cross); + } + + public boolean contains(float px, float py) { + return isInside(Crossing.crossShape(this, px, py)); + } + + public boolean contains(float rx, float ry, float rw, float rh) { + int cross = Crossing.intersectShape(this, rx, ry, rw, rh); + return cross != Crossing.CROSSING && isInside(cross); + } + + public boolean intersects(float rx, float ry, float rw, float rh) { + int cross = Crossing.intersectShape(this, rx, ry, rw, rh); + return cross == Crossing.CROSSING || isInside(cross); + } + + public boolean contains(Vertex p) { + return contains(p.getX(), p.getY()); + } + + public boolean contains(AABBox r) { + return contains(r); + } + + public boolean intersects(AABBox r) { + return intersects(r.getMinX(), r.getMinY(), r.getWidth(), r.getHeight()); + } + + public PathIterator iterator() { + return new Iterator(this); + } + + public PathIterator iterator(AffineTransform t) { + return new Iterator(this, t); + } + + /* public PathIterator getPathIterator(AffineTransform t, float flatness) { + return new FlatteningPathIterator(getPathIterator(t), flatness); + } */ + + @Override + public Object clone() { + try { + Path2D p = (Path2D) super.clone(); + p.types = types.clone(); + p.points = points.clone(); + return p; + } catch (CloneNotSupportedException e) { + throw new InternalError(); + } + } +} + |