| /* |
| * 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 |
| * @version $Revision$ |
| */ |
| package java.awt.geom; |
| |
| import java.awt.Rectangle; |
| import java.awt.Shape; |
| import java.util.NoSuchElementException; |
| |
| import org.apache.harmony.awt.gl.Crossing; |
| import org.apache.harmony.awt.internal.nls.Messages; |
| |
| /** |
| * The Class QuadCurve2D is a Shape that represents a segment of a |
| * quadratic (Bezier) curve. The curved segment is determined by three points: |
| * a start point, an end point, and a control point. The line from the control |
| * point to the starting point gives the tangent to the curve at the |
| * starting point, and the line from the control point to the end point |
| * gives the tangent to the curve at the end point. |
| */ |
| public abstract class QuadCurve2D implements Shape, Cloneable { |
| |
| /** |
| * The Class Float is the subclass of QuadCurve2D that has all |
| * of its data values stored with float-level precision. |
| */ |
| public static class Float extends QuadCurve2D { |
| |
| /** The x coordinate of the starting point of the curved segment. */ |
| public float x1; |
| |
| /** The y coordinate of the starting point of the curved segment. */ |
| public float y1; |
| |
| /** The x coordinate of the control point. */ |
| public float ctrlx; |
| |
| /** The y coordinate of the control point. */ |
| public float ctrly; |
| |
| /** The x coordinate of the end point of the curved segment. */ |
| public float x2; |
| |
| /** The y coordinate of the end point of the curved segment. */ |
| public float y2; |
| |
| /** |
| * Instantiates a new float-valued QuadCurve2D with all coordinate values |
| * set to zero. |
| */ |
| public Float() { |
| } |
| |
| /** |
| * Instantiates a new float-valued QuadCurve2D with the specified |
| * coordinate values. |
| * |
| * @param x1 the x coordinate of the starting point of the curved segment |
| * @param y1 the y coordinate of the starting point of the curved segment |
| * @param ctrlx the x coordinate of the control point |
| * @param ctrly the y coordinate of the control point |
| * @param x2 the x coordinate of the end point of the curved segment |
| * @param y2 the y coordinate of the end point of the curved segment |
| */ |
| public Float(float x1, float y1, float ctrlx, float ctrly, float x2, float y2) { |
| setCurve(x1, y1, ctrlx, ctrly, x2, y2); |
| } |
| |
| @Override |
| public double getX1() { |
| return x1; |
| } |
| |
| @Override |
| public double getY1() { |
| return y1; |
| } |
| |
| @Override |
| public double getCtrlX() { |
| return ctrlx; |
| } |
| |
| @Override |
| public double getCtrlY() { |
| return ctrly; |
| } |
| |
| @Override |
| public double getX2() { |
| return x2; |
| } |
| |
| @Override |
| public double getY2() { |
| return y2; |
| } |
| |
| @Override |
| public Point2D getP1() { |
| return new Point2D.Float(x1, y1); |
| } |
| |
| @Override |
| public Point2D getCtrlPt() { |
| return new Point2D.Float(ctrlx, ctrly); |
| } |
| |
| @Override |
| public Point2D getP2() { |
| return new Point2D.Float(x2, y2); |
| } |
| |
| @Override |
| public void setCurve(double x1, double y1, double ctrlx, double ctrly, double x2, double y2) { |
| this.x1 = (float)x1; |
| this.y1 = (float)y1; |
| this.ctrlx = (float)ctrlx; |
| this.ctrly = (float)ctrly; |
| this.x2 = (float)x2; |
| this.y2 = (float)y2; |
| } |
| |
| /** |
| * Sets the data values of the curve. |
| * |
| * @param x1 the x coordinate of the starting point of the curved segment |
| * @param y1 the y coordinate of the starting point of the curved segment |
| * @param ctrlx the x coordinate of the control point |
| * @param ctrly the y coordinate of the control point |
| * @param x2 the x coordinate of the end point of the curved segment |
| * @param y2 the y coordinate of the end point of the curved segment |
| */ |
| public void setCurve(float x1, float y1, float ctrlx, float ctrly, float x2, float y2) { |
| this.x1 = x1; |
| this.y1 = y1; |
| this.ctrlx = ctrlx; |
| this.ctrly = ctrly; |
| this.x2 = x2; |
| this.y2 = y2; |
| } |
| |
| public Rectangle2D getBounds2D() { |
| float rx0 = Math.min(Math.min(x1, x2), ctrlx); |
| float ry0 = Math.min(Math.min(y1, y2), ctrly); |
| float rx1 = Math.max(Math.max(x1, x2), ctrlx); |
| float ry1 = Math.max(Math.max(y1, y2), ctrly); |
| return new Rectangle2D.Float(rx0, ry0, rx1 - rx0, ry1 - ry0); |
| } |
| } |
| |
| /** |
| * The Class Double is the subclass of QuadCurve2D that has all |
| * of its data values stored with double-level precision. |
| */ |
| public static class Double extends QuadCurve2D { |
| |
| /** The x coordinate of the starting point of the curved segment. */ |
| public double x1; |
| |
| /** The y coordinate of the starting point of the curved segment. */ |
| public double y1; |
| |
| /** The x coordinate of the control point. */ |
| public double ctrlx; |
| |
| /** The y coordinate of the control point. */ |
| public double ctrly; |
| |
| /** The x coordinate of the end point of the curved segment. */ |
| public double x2; |
| |
| /** The y coordinate of the end point of the curved segment. */ |
| public double y2; |
| |
| /** |
| * Instantiates a new double-valued QuadCurve2D with all coordinate values |
| * set to zero. |
| */ |
| public Double() { |
| } |
| |
| /** |
| * Instantiates a new double-valued QuadCurve2D with the specified |
| * coordinate values. |
| * |
| * @param x1 the x coordinate of the starting point of the curved segment |
| * @param y1 the y coordinate of the starting point of the curved segment |
| * @param ctrlx the x coordinate of the control point |
| * @param ctrly the y coordinate of the control point |
| * @param x2 the x coordinate of the end point of the curved segment |
| * @param y2 the y coordinate of the end point of the curved segment |
| */ |
| public Double(double x1, double y1, double ctrlx, double ctrly, double x2, double y2) { |
| setCurve(x1, y1, ctrlx, ctrly, x2, y2); |
| } |
| |
| @Override |
| public double getX1() { |
| return x1; |
| } |
| |
| @Override |
| public double getY1() { |
| return y1; |
| } |
| |
| @Override |
| public double getCtrlX() { |
| return ctrlx; |
| } |
| |
| @Override |
| public double getCtrlY() { |
| return ctrly; |
| } |
| |
| @Override |
| public double getX2() { |
| return x2; |
| } |
| |
| @Override |
| public double getY2() { |
| return y2; |
| } |
| |
| @Override |
| public Point2D getP1() { |
| return new Point2D.Double(x1, y1); |
| } |
| |
| @Override |
| public Point2D getCtrlPt() { |
| return new Point2D.Double(ctrlx, ctrly); |
| } |
| |
| @Override |
| public Point2D getP2() { |
| return new Point2D.Double(x2, y2); |
| } |
| |
| @Override |
| public void setCurve(double x1, double y1, double ctrlx, double ctrly, double x2, double y2) { |
| this.x1 = x1; |
| this.y1 = y1; |
| this.ctrlx = ctrlx; |
| this.ctrly = ctrly; |
| this.x2 = x2; |
| this.y2 = y2; |
| } |
| |
| public Rectangle2D getBounds2D() { |
| double rx0 = Math.min(Math.min(x1, x2), ctrlx); |
| double ry0 = Math.min(Math.min(y1, y2), ctrly); |
| double rx1 = Math.max(Math.max(x1, x2), ctrlx); |
| double ry1 = Math.max(Math.max(y1, y2), ctrly); |
| return new Rectangle2D.Double(rx0, ry0, rx1 - rx0, ry1 - ry0); |
| } |
| } |
| |
| /* |
| * QuadCurve2D path iterator |
| */ |
| /** |
| * The PathIterator for a Quad2D curve. |
| */ |
| class Iterator implements PathIterator { |
| |
| /** The source QuadCurve2D object. */ |
| QuadCurve2D c; |
| |
| /** The path iterator transformation. */ |
| AffineTransform t; |
| |
| /** The current segment index. */ |
| int index; |
| |
| /** |
| * Constructs a new QuadCurve2D.Iterator for given curve and transformation |
| * |
| * @param q - the source QuadCurve2D object |
| * @param t the AffineTransform that acts on the coordinates before |
| * returning them (or null) |
| */ |
| Iterator(QuadCurve2D q, AffineTransform t) { |
| this.c = q; |
| this.t = t; |
| } |
| |
| public int getWindingRule() { |
| return WIND_NON_ZERO; |
| } |
| |
| public boolean isDone() { |
| return (index > 1); |
| } |
| |
| public void next() { |
| index++; |
| } |
| |
| public int currentSegment(double[] coords) { |
| if (isDone()) { |
| // awt.4B=Iterator out of bounds |
| throw new NoSuchElementException(Messages.getString("awt.4B")); //$NON-NLS-1$ |
| } |
| int type; |
| int count; |
| if (index == 0) { |
| type = SEG_MOVETO; |
| coords[0] = c.getX1(); |
| coords[1] = c.getY1(); |
| count = 1; |
| } else { |
| type = SEG_QUADTO; |
| coords[0] = c.getCtrlX(); |
| coords[1] = c.getCtrlY(); |
| coords[2] = c.getX2(); |
| coords[3] = c.getY2(); |
| count = 2; |
| } |
| if (t != null) { |
| t.transform(coords, 0, coords, 0, count); |
| } |
| return type; |
| } |
| |
| public int currentSegment(float[] coords) { |
| if (isDone()) { |
| // awt.4B=Iterator out of bounds |
| throw new NoSuchElementException(Messages.getString("awt.4B")); //$NON-NLS-1$ |
| } |
| int type; |
| int count; |
| if (index == 0) { |
| type = SEG_MOVETO; |
| coords[0] = (float)c.getX1(); |
| coords[1] = (float)c.getY1(); |
| count = 1; |
| } else { |
| type = SEG_QUADTO; |
| coords[0] = (float)c.getCtrlX(); |
| coords[1] = (float)c.getCtrlY(); |
| coords[2] = (float)c.getX2(); |
| coords[3] = (float)c.getY2(); |
| count = 2; |
| } |
| if (t != null) { |
| t.transform(coords, 0, coords, 0, count); |
| } |
| return type; |
| } |
| |
| } |
| |
| /** |
| * Instantiates a new quadratic curve. |
| */ |
| protected QuadCurve2D() { |
| } |
| |
| /** |
| * Gets the x coordinate of the starting point. |
| * |
| * @return the x coordinate of the starting point |
| */ |
| public abstract double getX1(); |
| |
| /** |
| * Gets the y coordinate of the starting point. |
| * |
| * @return the y coordinate of the starting point |
| */ |
| public abstract double getY1(); |
| |
| /** |
| * Gets the starting point. |
| * |
| * @return the starting point |
| */ |
| public abstract Point2D getP1(); |
| |
| /** |
| * Gets the x coordinate of the control point. |
| * |
| * @return the x coordinate of the control point |
| */ |
| public abstract double getCtrlX(); |
| |
| /** |
| * Gets the y coordinate of the control point. |
| * |
| * @return y coordinate of the control point |
| */ |
| public abstract double getCtrlY(); |
| |
| /** |
| * Gets the control point. |
| * |
| * @return the control point |
| */ |
| public abstract Point2D getCtrlPt(); |
| |
| /** |
| * Gets the x coordinate of the end point. |
| * |
| * @return the x coordinate of the end point |
| */ |
| public abstract double getX2(); |
| |
| /** |
| * Gets the y coordinate of the end point. |
| * |
| * @return the y coordinate of the end point |
| */ |
| public abstract double getY2(); |
| |
| /** |
| * Gets the end point. |
| * |
| * @return the end point |
| */ |
| public abstract Point2D getP2(); |
| |
| /** |
| * Sets the data of the curve. |
| * |
| * @param x1 the x coordinate of the starting point of the curved segment |
| * @param y1 the y coordinate of the starting point of the curved segment |
| * @param ctrlx the x coordinate of the control point |
| * @param ctrly the y coordinate of the control point |
| * @param x2 the x coordinate of the end point of the curved segment |
| * @param y2 the y coordinate of the end point of the curved segment |
| */ |
| public abstract void setCurve(double x1, double y1, double ctrlx, double ctrly, double x2, double y2); |
| |
| /** |
| * Sets the data of the curve. |
| * |
| * @param p1 the starting point of the curved segment |
| * @param cp the control point |
| * @param p2 the end point of the curved segment |
| * |
| * @throws NullPointerException if any of the three points is null. |
| */ |
| public void setCurve(Point2D p1, Point2D cp, Point2D p2) { |
| setCurve(p1.getX(), p1.getY(), cp.getX(), cp.getY(), p2.getX(), p2.getY()); |
| } |
| |
| /** |
| * Sets the data of the curve by reading the data from an array |
| * of values. The values are read in the same order as the arguments |
| * of the method {@link QuadCurve2D#setCurve(double, double, double, double, double, double)}. |
| * |
| * @param coords the array of values containing the new coordinates |
| * @param offset the offset of the data to read within the array |
| * |
| * @throws ArrayIndexOutOfBoundsException if coords.length < offset + 6. |
| * @throws NullPointerException if the coordinate array is null. |
| */ |
| public void setCurve(double[] coords, int offset) { |
| setCurve( |
| coords[offset + 0], coords[offset + 1], |
| coords[offset + 2], coords[offset + 3], |
| coords[offset + 4], coords[offset + 5]); |
| } |
| |
| /** |
| * Sets the data of the curve by reading the data from an array |
| * of points. The values are read in the same order as the arguments |
| * of the method {@link QuadCurve2D#setCurve(Point2D, Point2D, Point2D)} |
| * |
| * @param points the array of points containing the new coordinates |
| * @param offset the offset of the data to read within the array |
| * |
| * @throws ArrayIndexOutOfBoundsException if points.length < offset + 3. |
| * @throws NullPointerException if the point array is null. |
| */ |
| public void setCurve(Point2D[] points, int offset) { |
| setCurve( |
| points[offset + 0].getX(), points[offset + 0].getY(), |
| points[offset + 1].getX(), points[offset + 1].getY(), |
| points[offset + 2].getX(), points[offset + 2].getY()); |
| } |
| |
| /** |
| * Sets the data of the curve by copying it from another QuadCurve2D. |
| * |
| * @param curve the curve to copy the data points from |
| * |
| * @throws NullPointerException if the curve is null. |
| */ |
| public void setCurve(QuadCurve2D curve) { |
| setCurve( |
| curve.getX1(), curve.getY1(), |
| curve.getCtrlX(), curve.getCtrlY(), |
| curve.getX2(), curve.getY2()); |
| } |
| |
| /** |
| * Gets the square of the distance from the control point to the |
| * straight line segment connecting the start point and the end point |
| * for this curve. |
| * |
| * @return the square of the distance from the control point to the |
| * straight line segment connecting the start point and the end point. |
| */ |
| public double getFlatnessSq() { |
| return Line2D.ptSegDistSq( |
| getX1(), getY1(), |
| getX2(), getY2(), |
| getCtrlX(), getCtrlY()); |
| } |
| |
| /** |
| * Gets the square of the distance from the control point to the |
| * straight line segment connecting the start point and the end point. |
| * |
| * @param x1 the x coordinate of the starting point of the curved segment |
| * @param y1 the y coordinate of the starting point of the curved segment |
| * @param ctrlx the x coordinate of the control point |
| * @param ctrly the y coordinate of the control point |
| * @param x2 the x coordinate of the end point of the curved segment |
| * @param y2 the y coordinate of the end point of the curved segment |
| * |
| * @return the square of the distance from the control point to the |
| * straight line segment connecting the start point and the end point. |
| */ |
| public static double getFlatnessSq(double x1, double y1, double ctrlx, double ctrly, double x2, double y2) { |
| return Line2D.ptSegDistSq(x1, y1, x2, y2, ctrlx, ctrly); |
| } |
| |
| /** |
| * Gets the square of the distance from the control point to the |
| * straight line segment connecting the start point and the end point |
| * by reading the coordinates of the points from an array of values. |
| * The values are read in the same order as the arguments |
| * of the method {@link QuadCurve2D#getFlatnessSq(double, double, double, double, double, double)}. |
| * |
| * @param coords the array of points containing the coordinates to use for |
| * the calculation |
| * @param offset the offset of the data to read within the array |
| * |
| * @return the square of the distance from the control point to the |
| * straight line segment connecting the start point and the end point. |
| * |
| * @throws ArrayIndexOutOfBoundsException if coords.length < offset + 6. |
| * @throws NullPointerException if the coordinate array is null. |
| */ |
| public static double getFlatnessSq(double coords[], int offset) { |
| return Line2D.ptSegDistSq( |
| coords[offset + 0], coords[offset + 1], |
| coords[offset + 4], coords[offset + 5], |
| coords[offset + 2], coords[offset + 3]); |
| } |
| |
| /** |
| * Gets the distance from the control point to the |
| * straight line segment connecting the start point and the end point |
| * of this QuadCurve2D. |
| * |
| * @return the the distance from the control point to the |
| * straight line segment connecting the start point and the end point |
| * of this QuadCurve2D |
| */ |
| public double getFlatness() { |
| return Line2D.ptSegDist(getX1(), getY1(), getX2(), getY2(), getCtrlX(), getCtrlY()); |
| } |
| |
| /** |
| * Gets the distance from the control point to the |
| * straight line segment connecting the start point and the end point. |
| * |
| * @param x1 the x coordinate of the starting point of the curved segment |
| * @param y1 the y coordinate of the starting point of the curved segment |
| * @param ctrlx the x coordinate of the control point |
| * @param ctrly the y coordinate of the control point |
| * @param x2 the x coordinate of the end point of the curved segment |
| * @param y2 the y coordinate of the end point of the curved segment |
| * |
| * @return the the distance from the control point to the |
| * straight line segment connecting the start point and the end point |
| */ |
| public static double getFlatness(double x1, double y1, double ctrlx, |
| double ctrly, double x2, double y2) |
| { |
| return Line2D.ptSegDist(x1, y1, x2, y2, ctrlx, ctrly); |
| } |
| |
| /** |
| * Gets the the distance from the control point to the |
| * straight line segment connecting the start point and the end point. |
| * The values are read in the same order as the arguments |
| * of the method {@link QuadCurve2D#getFlatness(double, double, double, double, double, double)}. |
| * |
| * @param coords the array of points containing the coordinates to use for |
| * the calculation |
| * @param offset the offset of the data to read within the array |
| * |
| * @return the the distance from the control point to the |
| * straight line segment connecting the start point and the end point |
| * |
| * @throws ArrayIndexOutOfBoundsException if coords.length < offset + 6. |
| * @throws NullPointerException if the coordinate array is null. |
| */ |
| public static double getFlatness(double coords[], int offset) { |
| return Line2D.ptSegDist( |
| coords[offset + 0], coords[offset + 1], |
| coords[offset + 4], coords[offset + 5], |
| coords[offset + 2], coords[offset + 3]); |
| } |
| |
| /** |
| * Creates the data for two quadratic curves by dividing this |
| * curve in two. The division point is the point on the curve |
| * that is closest to this curve's control point. The data of |
| * this curve is left unchanged. |
| * |
| * @param left the QuadCurve2D where the left (start) segment's |
| * data is written |
| * @param right the QuadCurve2D where the right (end) segment's |
| * data is written |
| * |
| * @throws NullPointerException if either curve is null. |
| */ |
| public void subdivide(QuadCurve2D left, QuadCurve2D right) { |
| subdivide(this, left, right); |
| } |
| |
| /** |
| * Creates the data for two quadratic curves by dividing a source |
| * curve in two. The division point is the point on the curve |
| * that is closest to the source curve's control point. The data of |
| * the source curve is left unchanged. |
| * |
| * @param src the curve that provides the initial data |
| * @param left the QuadCurve2D where the left (start) segment's |
| * data is written |
| * @param right the QuadCurve2D where the right (end) segment's |
| * data is written |
| * |
| * @throws NullPointerException if one of the curves is null. |
| */ |
| public static void subdivide(QuadCurve2D src, QuadCurve2D left, QuadCurve2D right) { |
| double x1 = src.getX1(); |
| double y1 = src.getY1(); |
| double cx = src.getCtrlX(); |
| double cy = src.getCtrlY(); |
| double x2 = src.getX2(); |
| double y2 = src.getY2(); |
| double cx1 = (x1 + cx) / 2.0; |
| double cy1 = (y1 + cy) / 2.0; |
| double cx2 = (x2 + cx) / 2.0; |
| double cy2 = (y2 + cy) / 2.0; |
| cx = (cx1 + cx2) / 2.0; |
| cy = (cy1 + cy2) / 2.0; |
| if (left != null) { |
| left.setCurve(x1, y1, cx1, cy1, cx, cy); |
| } |
| if (right != null) { |
| right.setCurve(cx, cy, cx2, cy2, x2, y2); |
| } |
| } |
| |
| /** |
| * Creates the data for two quadratic curves by dividing a source |
| * curve in two. The division point is the point on the curve |
| * that is closest to the source curve's control point. The data |
| * for the three curves is read and written from arrays of values in |
| * the usual order: x1, y1, cx, cy, x2, y2. |
| * |
| * @param src the array that gives the data values for the source curve |
| * @param srcoff the offset in the src array to read the values from |
| * @param left the array where the coordinates of the start curve should be written |
| * @param leftOff the offset in the left array to start writing the values |
| * @param right the array where the coordinates of the end curve should be written |
| * @param rightOff the offset in the right array to start writing the values |
| * |
| * @throws ArrayIndexOutOfBoundsException if src.length < srcoff + 6 |
| * or if left.length < leftOff + 6 or if right.length < rightOff + 6. |
| * @throws NullPointerException if one of the arrays is null. |
| */ |
| public static void subdivide(double src[], int srcoff, double left[], |
| int leftOff, double right[], int rightOff) |
| { |
| double x1 = src[srcoff + 0]; |
| double y1 = src[srcoff + 1]; |
| double cx = src[srcoff + 2]; |
| double cy = src[srcoff + 3]; |
| double x2 = src[srcoff + 4]; |
| double y2 = src[srcoff + 5]; |
| double cx1 = (x1 + cx) / 2.0; |
| double cy1 = (y1 + cy) / 2.0; |
| double cx2 = (x2 + cx) / 2.0; |
| double cy2 = (y2 + cy) / 2.0; |
| cx = (cx1 + cx2) / 2.0; |
| cy = (cy1 + cy2) / 2.0; |
| if (left != null) { |
| left[leftOff + 0] = x1; |
| left[leftOff + 1] = y1; |
| left[leftOff + 2] = cx1; |
| left[leftOff + 3] = cy1; |
| left[leftOff + 4] = cx; |
| left[leftOff + 5] = cy; |
| } |
| if (right != null) { |
| right[rightOff + 0] = cx; |
| right[rightOff + 1] = cy; |
| right[rightOff + 2] = cx2; |
| right[rightOff + 3] = cy2; |
| right[rightOff + 4] = x2; |
| right[rightOff + 5] = y2; |
| } |
| } |
| |
| /** |
| * Finds the roots of the quadratic polynomial. This is |
| * accomplished by finding the (real) values of x that solve |
| * the following equation: eqn[2]*x*x + eqn[1]*x + eqn[0] = 0. |
| * The solutions are written back into the array eqn starting |
| * from the index 0 in the array. The return value tells how |
| * many array elements have been changed by this method call. |
| * |
| * @param eqn an array containing the coefficients of the |
| * quadratic polynomial to solve. |
| * |
| * @return the number of roots of the quadratic polynomial |
| * |
| * @throws ArrayIndexOutOfBoundsException if eqn.length < 3. |
| * @throws NullPointerException if the array is null. |
| */ |
| public static int solveQuadratic(double eqn[]) { |
| return solveQuadratic(eqn, eqn); |
| } |
| |
| /** |
| * Finds the roots of the quadratic polynomial. This is |
| * accomplished by finding the (real) values of x that solve |
| * the following equation: eqn[2]*x*x + eqn[1]*x + eqn[0] = 0. |
| * The solutions are written into the array res starting |
| * from the index 0 in the array. The return value tells how |
| * many array elements have been written by this method call. |
| * |
| * @param eqn an array containing the coefficients of the |
| * quadratic polynomial to solve. |
| * @param res the array that this method writes the results into |
| * |
| * @return the number of roots of the quadratic polynomial |
| * |
| * @throws ArrayIndexOutOfBoundsException if eqn.length < 3 or |
| * if res.length is less than the number of roots. |
| * @throws NullPointerException if either array is null. |
| */ |
| public static int solveQuadratic(double eqn[], double res[]) { |
| return Crossing.solveQuad(eqn, res); |
| } |
| |
| public boolean contains(double px, double py) { |
| return Crossing.isInsideEvenOdd(Crossing.crossShape(this, px, py)); |
| } |
| |
| public boolean contains(double rx, double ry, double rw, double rh) { |
| int cross = Crossing.intersectShape(this, rx, ry, rw, rh); |
| return cross != Crossing.CROSSING && Crossing.isInsideEvenOdd(cross); |
| } |
| |
| public boolean intersects(double rx, double ry, double rw, double rh) { |
| int cross = Crossing.intersectShape(this, rx, ry, rw, rh); |
| return cross == Crossing.CROSSING || Crossing.isInsideEvenOdd(cross); |
| } |
| |
| public boolean contains(Point2D p) { |
| return contains(p.getX(), p.getY()); |
| } |
| |
| public boolean intersects(Rectangle2D r) { |
| return intersects(r.getX(), r.getY(), r.getWidth(), r.getHeight()); |
| } |
| |
| public boolean contains(Rectangle2D r) { |
| return contains(r.getX(), r.getY(), r.getWidth(), r.getHeight()); |
| } |
| |
| public Rectangle getBounds() { |
| return getBounds2D().getBounds(); |
| } |
| |
| public PathIterator getPathIterator(AffineTransform t) { |
| return new Iterator(this, t); |
| } |
| |
| public PathIterator getPathIterator(AffineTransform t, double flatness) { |
| return new FlatteningPathIterator(getPathIterator(t), flatness); |
| } |
| |
| @Override |
| public Object clone() { |
| try { |
| return super.clone(); |
| } catch (CloneNotSupportedException e) { |
| throw new InternalError(); |
| } |
| } |
| |
| } |
| |