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Diffstat (limited to 'libjava/java/awt/geom/QuadCurve2D.java')
| -rw-r--r-- | libjava/java/awt/geom/QuadCurve2D.java | 486 |
1 files changed, 486 insertions, 0 deletions
diff --git a/libjava/java/awt/geom/QuadCurve2D.java b/libjava/java/awt/geom/QuadCurve2D.java new file mode 100644 index 00000000000..2f1aafad21b --- /dev/null +++ b/libjava/java/awt/geom/QuadCurve2D.java @@ -0,0 +1,486 @@ +/* QuadCurve2D.java -- represents a parameterized quadratic curve in 2-D space + Copyright (C) 2002 Free Software Foundation + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA +02111-1307 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.awt.geom; + +import java.awt.Rectangle; +import java.awt.Shape; +import java.util.NoSuchElementException; + +/** + * STUBS ONLY + * XXX Implement and document. + */ +public abstract class QuadCurve2D implements Shape, Cloneable +{ + protected QuadCurve2D() + { + } + + public abstract double getX1(); + public abstract double getY1(); + public abstract Point2D getP1(); + public abstract double getCtrlX(); + public abstract double getCtrlY(); + public abstract Point2D getCtrlPt(); + public abstract double getX2(); + public abstract double getY2(); + public abstract Point2D getP2(); + + public abstract void setCurve(double x1, double y1, double cx, double cy, + double x2, double y2); + public void setCurve(double[] coords, int offset) + { + setCurve(coords[offset++], coords[offset++], + coords[offset++], coords[offset++], + coords[offset++], coords[offset++]); + } + public void setCurve(Point2D p1, Point2D c, Point2D p2) + { + setCurve(p1.getX(), p1.getY(), c.getX(), c.getY(), + p2.getX(), p2.getY()); + } + public void setCurve(Point2D[] pts, int offset) + { + setCurve(pts[offset].getX(), pts[offset++].getY(), + pts[offset].getX(), pts[offset++].getY(), + pts[offset].getX(), pts[offset++].getY()); + } + public void setCurve(QuadCurve2D c) + { + setCurve(c.getX1(), c.getY1(), c.getCtrlX(), c.getCtrlY(), + c.getX2(), c.getY2()); + } + public static double getFlatnessSq(double x1, double y1, double cx, + double cy, double x2, double y2) + { + // XXX Implement. + throw new Error("not implemented"); + } + public static double getFlatness(double x1, double y1, double cx, double cy, + double x2, double y2) + { + return Math.sqrt(getFlatnessSq(x1, y1, cx, cy, x2, y2)); + } + public static double getFlatnessSq(double[] coords, int offset) + { + return getFlatnessSq(coords[offset++], coords[offset++], + coords[offset++], coords[offset++], + coords[offset++], coords[offset++]); + } + public static double getFlatness(double[] coords, int offset) + { + return Math.sqrt(getFlatnessSq(coords[offset++], coords[offset++], + coords[offset++], coords[offset++], + coords[offset++], coords[offset++])); + } + public double getFlatnessSq() + { + return getFlatnessSq(getX1(), getY1(), getCtrlX(), getCtrlY(), + getX2(), getY2()); + } + public double getFlatness() + { + return Math.sqrt(getFlatnessSq(getX1(), getY1(), getCtrlX(), getCtrlY(), + getX2(), getY2())); + } + + public void subdivide(QuadCurve2D l, QuadCurve2D r) + { + if (l == null) + l = new QuadCurve2D.Double(); + if (r == null) + r = new QuadCurve2D.Double(); + // Use empty slots at end to share single array. + double[] d = new double[] { getX1(), getY1(), getCtrlX(), getCtrlY(), + getX2(), getY2(), 0, 0, 0, 0 }; + subdivide(d, 0, d, 0, d, 4); + l.setCurve(d, 0); + r.setCurve(d, 4); + } + public static void subdivide(QuadCurve2D src, QuadCurve2D l, QuadCurve2D r) + { + src.subdivide(l, r); + } + public static void subdivide(double[] src, int srcOff, + double[] left, int leftOff, + double[] right, int rightOff) + { + // XXX Implement. + throw new Error("not implemented"); + } + public static int solveQuadratic(double[] eqn) + { + return solveQuadratic(eqn, eqn); + } + public static int solveQuadratic(double[] eqn, double[] res) + { + double c = eqn[0]; + double b = eqn[1]; + double a = eqn[2]; + if (a == 0) + { + if (b == 0) + return -1; + res[0] = -c / b; + return 1; + } + c /= a; + b /= a * 2; + double det = Math.sqrt(b * b - c); + if (det != det) + return 0; + // For fewer rounding errors, we calculate the two roots differently. + if (b > 0) + { + res[0] = -b - det; + res[1] = -c / (b + det); + } + else + { + res[0] = -c / (b - det); + res[1] = -b + det; + } + return 2; + } + + public boolean contains(double x, double y) + { + // XXX Implement. + throw new Error("not implemented"); + } + public boolean contains(Point2D p) + { + return contains(p.getX(), p.getY()); + } + public boolean intersects(double x, double y, double w, double h) + { + // XXX Implement. + throw new Error("not implemented"); + } + public boolean intersects(Rectangle2D r) + { + return intersects(r.getX(), r.getY(), r.getWidth(), r.getHeight()); + } + public boolean contains(double x, double y, double w, double h) + { + // XXX Implement. + throw new Error("not implemented"); + } + public boolean contains(Rectangle2D r) + { + return contains(r.getX(), r.getY(), r.getWidth(), r.getHeight()); + } + public Rectangle getBounds() + { + return getBounds2D().getBounds(); + } + public PathIterator getPathIterator(final AffineTransform at) + { + return new PathIterator() + { + /** Current coordinate. */ + private int current; + + public int getWindingRule() + { + return WIND_NON_ZERO; + } + + public boolean isDone() + { + return current < 2; + } + + public void next() + { + current++; + } + + public int currentSegment(float[] coords) + { + if (current == 0) + { + coords[0] = (float) getX1(); + coords[1] = (float) getY1(); + if (at != null) + at.transform(coords, 0, coords, 0, 1); + return SEG_MOVETO; + } + if (current == 1) + { + coords[0] = (float) getCtrlX(); + coords[1] = (float) getCtrlY(); + coords[2] = (float) getX2(); + coords[3] = (float) getY2(); + if (at != null) + at.transform(coords, 0, coords, 0, 2); + return SEG_QUADTO; + } + throw new NoSuchElementException("quad iterator out of bounds"); + } + + public int currentSegment(double[] coords) + { + if (current == 0) + { + coords[0] = getX1(); + coords[1] = getY1(); + if (at != null) + at.transform(coords, 0, coords, 0, 1); + return SEG_MOVETO; + } + if (current == 1) + { + coords[0] = getCtrlX(); + coords[1] = getCtrlY(); + coords[2] = getX2(); + coords[3] = getY2(); + if (at != null) + at.transform(coords, 0, coords, 0, 2); + return SEG_QUADTO; + } + throw new NoSuchElementException("quad iterator out of bounds"); + } + }; + } + public PathIterator getPathIterator(AffineTransform at, double flatness) + { + return new FlatteningPathIterator(getPathIterator(at), flatness); + } + + /** + * Create a new curve of the same run-time type with the same contents as + * this one. + * + * @return the clone + */ + public Object clone() + { + try + { + return super.clone(); + } + catch (CloneNotSupportedException e) + { + throw (Error) new InternalError().initCause(e); // Impossible + } + } + + /** + * STUBS ONLY + */ + public static class Double extends QuadCurve2D + { + public double x1; + public double y1; + public double ctrlx; + public double ctrly; + public double x2; + public double y2; + + public Double() + { + } + + public Double(double x1, double y1, double cx, double cy, + double x2, double y2) + { + this.x1 = x1; + this.y1 = y1; + ctrlx = cx; + ctrly = cy; + this.x2 = x2; + this.y2 = y2; + } + + public double getX1() + { + return x1; + } + public double getY1() + { + return y1; + } + public Point2D getP1() + { + return new Point2D.Double(x1, y1); + } + + public double getCtrlX() + { + return ctrlx; + } + public double getCtrlY() + { + return ctrly; + } + public Point2D getCtrlPt() + { + return new Point2D.Double(ctrlx, ctrly); + } + + public double getX2() + { + return x2; + } + public double getY2() + { + return y2; + } + public Point2D getP2() + { + return new Point2D.Double(x2, y2); + } + + public void setCurve(double x1, double y1, double cx, double cy, + double x2, double y2) + { + this.x1 = x1; + this.y1 = y1; + ctrlx = cx; + ctrly = cy; + this.x2 = x2; + this.y2 = y2; + } + public Rectangle2D getBounds2D() + { + double nx1 = Math.min(Math.min(x1, ctrlx), x2); + double ny1 = Math.min(Math.min(y1, ctrly), y2); + double nx2 = Math.max(Math.max(x1, ctrlx), x2); + double ny2 = Math.max(Math.max(y1, ctrly), y2); + return new Rectangle2D.Double(nx1, ny1, nx2 - nx1, ny2 - ny1); + } + } // class Double + + /** + * STUBS ONLY + */ + public static class Float extends QuadCurve2D + { + public float x1; + public float y1; + public float ctrlx; + public float ctrly; + public float x2; + public float y2; + + public Float() + { + } + + public Float(float x1, float y1, float cx, float cy, + float x2, float y2) + { + this.x1 = x1; + this.y1 = y1; + ctrlx = cx; + ctrly = cy; + this.x2 = x2; + this.y2 = y2; + } + + public double getX1() + { + return x1; + } + public double getY1() + { + return y1; + } + public Point2D getP1() + { + return new Point2D.Float(x1, y1); + } + + public double getCtrlX() + { + return ctrlx; + } + public double getCtrlY() + { + return ctrly; + } + public Point2D getCtrlPt() + { + return new Point2D.Float(ctrlx, ctrly); + } + + public double getX2() + { + return x2; + } + public double getY2() + { + return y2; + } + public Point2D getP2() + { + return new Point2D.Float(x2, y2); + } + + public void setCurve(double x1, double y1, double cx, double cy, + double x2, double y2) + { + this.x1 = (float) x1; + this.y1 = (float) y1; + ctrlx = (float) cx; + ctrly = (float) cy; + this.x2 = (float) x2; + this.y2 = (float) y2; + } + public void setCurve(float x1, float y1, float cx, float cy, + float x2, float y2) + { + this.x1 = x1; + this.y1 = y1; + ctrlx = cx; + ctrly = cy; + this.x2 = x2; + this.y2 = y2; + } + public Rectangle2D getBounds2D() + { + float nx1 = (float) Math.min(Math.min(x1, ctrlx), x2); + float ny1 = (float) Math.min(Math.min(y1, ctrly), y2); + float nx2 = (float) Math.max(Math.max(x1, ctrlx), x2); + float ny2 = (float) Math.max(Math.max(y1, ctrly), y2); + return new Rectangle2D.Float(nx1, ny1, nx2 - nx1, ny2 - ny1); + } + } // class Float +} // class CubicCurve2D |
