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iText, a free Java-PDF library
/*
* 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.
*
* This code was originally part of the Apache Harmony project.
* The Apache Harmony project has been discontinued.
* That's why we imported the code into iText.
*/
/**
* @author Denis M. Kishenko
*/
package com.itextpdf.awt.geom;
import java.util.NoSuchElementException;
import com.itextpdf.awt.geom.gl.Crossing;
import com.itextpdf.awt.geom.misc.Messages;
public abstract class CubicCurve2D implements Shape, Cloneable {
public static class Float extends CubicCurve2D {
public float x1;
public float y1;
public float ctrlx1;
public float ctrly1;
public float ctrlx2;
public float ctrly2;
public float x2;
public float y2;
public Float() {
}
public Float(float x1, float y1, float ctrlx1, float ctrly1, float ctrlx2, float ctrly2, float x2, float y2) {
setCurve(x1, y1, ctrlx1, ctrly1, ctrlx2, ctrly2, x2, y2);
}
@Override
public double getX1() {
return x1;
}
@Override
public double getY1() {
return y1;
}
@Override
public double getCtrlX1() {
return ctrlx1;
}
@Override
public double getCtrlY1() {
return ctrly1;
}
@Override
public double getCtrlX2() {
return ctrlx2;
}
@Override
public double getCtrlY2() {
return ctrly2;
}
@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 getCtrlP1() {
return new Point2D.Float(ctrlx1, ctrly1);
}
@Override
public Point2D getCtrlP2() {
return new Point2D.Float(ctrlx2, ctrly2);
}
@Override
public Point2D getP2() {
return new Point2D.Float(x2, y2);
}
@Override
public void setCurve(double x1, double y1, double ctrlx1, double ctrly1,
double ctrlx2, double ctrly2, double x2, double y2)
{
this.x1 = (float)x1;
this.y1 = (float)y1;
this.ctrlx1 = (float)ctrlx1;
this.ctrly1 = (float)ctrly1;
this.ctrlx2 = (float)ctrlx2;
this.ctrly2 = (float)ctrly2;
this.x2 = (float)x2;
this.y2 = (float)y2;
}
public void setCurve(float x1, float y1, float ctrlx1, float ctrly1,
float ctrlx2, float ctrly2, float x2, float y2)
{
this.x1 = x1;
this.y1 = y1;
this.ctrlx1 = ctrlx1;
this.ctrly1 = ctrly1;
this.ctrlx2 = ctrlx2;
this.ctrly2 = ctrly2;
this.x2 = x2;
this.y2 = y2;
}
public Rectangle2D getBounds2D() {
float rx1 = Math.min(Math.min(x1, x2), Math.min(ctrlx1, ctrlx2));
float ry1 = Math.min(Math.min(y1, y2), Math.min(ctrly1, ctrly2));
float rx2 = Math.max(Math.max(x1, x2), Math.max(ctrlx1, ctrlx2));
float ry2 = Math.max(Math.max(y1, y2), Math.max(ctrly1, ctrly2));
return new Rectangle2D.Float(rx1, ry1, rx2 - rx1, ry2 - ry1);
}
}
public static class Double extends CubicCurve2D {
public double x1;
public double y1;
public double ctrlx1;
public double ctrly1;
public double ctrlx2;
public double ctrly2;
public double x2;
public double y2;
public Double() {
}
public Double(double x1, double y1, double ctrlx1, double ctrly1,
double ctrlx2, double ctrly2, double x2, double y2) {
setCurve(x1, y1, ctrlx1, ctrly1, ctrlx2, ctrly2, x2, y2);
}
@Override
public double getX1() {
return x1;
}
@Override
public double getY1() {
return y1;
}
@Override
public double getCtrlX1() {
return ctrlx1;
}
@Override
public double getCtrlY1() {
return ctrly1;
}
@Override
public double getCtrlX2() {
return ctrlx2;
}
@Override
public double getCtrlY2() {
return ctrly2;
}
@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 getCtrlP1() {
return new Point2D.Double(ctrlx1, ctrly1);
}
@Override
public Point2D getCtrlP2() {
return new Point2D.Double(ctrlx2, ctrly2);
}
@Override
public Point2D getP2() {
return new Point2D.Double(x2, y2);
}
@Override
public void setCurve(double x1, double y1, double ctrlx1, double ctrly1,
double ctrlx2, double ctrly2, double x2, double y2)
{
this.x1 = x1;
this.y1 = y1;
this.ctrlx1 = ctrlx1;
this.ctrly1 = ctrly1;
this.ctrlx2 = ctrlx2;
this.ctrly2 = ctrly2;
this.x2 = x2;
this.y2 = y2;
}
public Rectangle2D getBounds2D() {
double rx1 = Math.min(Math.min(x1, x2), Math.min(ctrlx1, ctrlx2));
double ry1 = Math.min(Math.min(y1, y2), Math.min(ctrly1, ctrly2));
double rx2 = Math.max(Math.max(x1, x2), Math.max(ctrlx1, ctrlx2));
double ry2 = Math.max(Math.max(y1, y2), Math.max(ctrly1, ctrly2));
return new Rectangle2D.Double(rx1, ry1, rx2 - rx1, ry2 - ry1);
}
}
/*
* CubicCurve2D path iterator
*/
class Iterator implements PathIterator {
/**
* The source CubicCurve2D object
*/
CubicCurve2D c;
/**
* The path iterator transformation
*/
AffineTransform t;
/**
* The current segmenet index
*/
int index;
/**
* Constructs a new CubicCurve2D.Iterator for given line and transformation
* @param c - the source CubicCurve2D object
* @param at - the AffineTransform object to apply rectangle path
*/
Iterator(CubicCurve2D c, AffineTransform t) {
this.c = c;
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()) {
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_CUBICTO;
coords[0] = c.getCtrlX1();
coords[1] = c.getCtrlY1();
coords[2] = c.getCtrlX2();
coords[3] = c.getCtrlY2();
coords[4] = c.getX2();
coords[5] = c.getY2();
count = 3;
}
if (t != null) {
t.transform(coords, 0, coords, 0, count);
}
return type;
}
public int currentSegment(float[] coords) {
if (isDone()) {
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_CUBICTO;
coords[0] = (float)c.getCtrlX1();
coords[1] = (float)c.getCtrlY1();
coords[2] = (float)c.getCtrlX2();
coords[3] = (float)c.getCtrlY2();
coords[4] = (float)c.getX2();
coords[5] = (float)c.getY2();
count = 3;
}
if (t != null) {
t.transform(coords, 0, coords, 0, count);
}
return type;
}
}
protected CubicCurve2D() {
}
public abstract double getX1();
public abstract double getY1();
public abstract Point2D getP1();
public abstract double getCtrlX1();
public abstract double getCtrlY1();
public abstract Point2D getCtrlP1();
public abstract double getCtrlX2();
public abstract double getCtrlY2();
public abstract Point2D getCtrlP2();
public abstract double getX2();
public abstract double getY2();
public abstract Point2D getP2();
public abstract void setCurve(double x1, double y1, double ctrlx1, double ctrly1,
double ctrlx2, double ctrly2, double x2, double y2);
public void setCurve(Point2D p1, Point2D cp1, Point2D cp2, Point2D p2) {
setCurve(
p1.getX(), p1.getY(),
cp1.getX(), cp1.getY(),
cp2.getX(), cp2.getY(),
p2.getX(), p2.getY());
}
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],
coords[offset + 6], coords[offset + 7]);
}
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(),
points[offset + 3].getX(), points[offset + 3].getY());
}
public void setCurve(CubicCurve2D curve) {
setCurve(
curve.getX1(), curve.getY1(),
curve.getCtrlX1(), curve.getCtrlY1(),
curve.getCtrlX2(), curve.getCtrlY2(),
curve.getX2(), curve.getY2());
}
public double getFlatnessSq() {
return getFlatnessSq(
getX1(), getY1(),
getCtrlX1(), getCtrlY1(),
getCtrlX2(), getCtrlY2(),
getX2(), getY2());
}
public static double getFlatnessSq(double x1, double y1, double ctrlx1, double ctrly1,
double ctrlx2, double ctrly2, double x2, double y2)
{
return Math.max(
Line2D.ptSegDistSq(x1, y1, x2, y2, ctrlx1, ctrly1),
Line2D.ptSegDistSq(x1, y1, x2, y2, ctrlx2, ctrly2));
}
public static double getFlatnessSq(double coords[], int offset) {
return getFlatnessSq(
coords[offset + 0], coords[offset + 1],
coords[offset + 2], coords[offset + 3],
coords[offset + 4], coords[offset + 5],
coords[offset + 6], coords[offset + 7]);
}
public double getFlatness() {
return getFlatness(
getX1(), getY1(),
getCtrlX1(), getCtrlY1(),
getCtrlX2(), getCtrlY2(),
getX2(), getY2());
}
public static double getFlatness(double x1, double y1, double ctrlx1, double ctrly1,
double ctrlx2, double ctrly2, double x2, double y2)
{
return Math.sqrt(getFlatnessSq(x1, y1, ctrlx1, ctrly1, ctrlx2, ctrly2, x2, y2));
}
public static double getFlatness(double coords[], int offset) {
return getFlatness(
coords[offset + 0], coords[offset + 1],
coords[offset + 2], coords[offset + 3],
coords[offset + 4], coords[offset + 5],
coords[offset + 6], coords[offset + 7]);
}
public void subdivide(CubicCurve2D left, CubicCurve2D right) {
subdivide(this, left, right);
}
public static void subdivide(CubicCurve2D src, CubicCurve2D left, CubicCurve2D right) {
double x1 = src.getX1();
double y1 = src.getY1();
double cx1 = src.getCtrlX1();
double cy1 = src.getCtrlY1();
double cx2 = src.getCtrlX2();
double cy2 = src.getCtrlY2();
double x2 = src.getX2();
double y2 = src.getY2();
double cx = (cx1 + cx2) / 2.0;
double cy = (cy1 + cy2) / 2.0;
cx1 = (x1 + cx1) / 2.0;
cy1 = (y1 + cy1) / 2.0;
cx2 = (x2 + cx2) / 2.0;
cy2 = (y2 + cy2) / 2.0;
double ax = (cx1 + cx) / 2.0;
double ay = (cy1 + cy) / 2.0;
double bx = (cx2 + cx) / 2.0;
double by = (cy2 + cy) / 2.0;
cx = (ax + bx) / 2.0;
cy = (ay + by) / 2.0;
if (left != null) {
left.setCurve(x1, y1, cx1, cy1, ax, ay, cx, cy);
}
if (right != null) {
right.setCurve(cx, cy, bx, by, cx2, cy2, x2, y2);
}
}
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 cx1 = src[srcOff + 2];
double cy1 = src[srcOff + 3];
double cx2 = src[srcOff + 4];
double cy2 = src[srcOff + 5];
double x2 = src[srcOff + 6];
double y2 = src[srcOff + 7];
double cx = (cx1 + cx2) / 2.0;
double cy = (cy1 + cy2) / 2.0;
cx1 = (x1 + cx1) / 2.0;
cy1 = (y1 + cy1) / 2.0;
cx2 = (x2 + cx2) / 2.0;
cy2 = (y2 + cy2) / 2.0;
double ax = (cx1 + cx) / 2.0;
double ay = (cy1 + cy) / 2.0;
double bx = (cx2 + cx) / 2.0;
double by = (cy2 + cy) / 2.0;
cx = (ax + bx) / 2.0;
cy = (ay + by) / 2.0;
if (left != null) {
left[leftOff + 0] = x1;
left[leftOff + 1] = y1;
left[leftOff + 2] = cx1;
left[leftOff + 3] = cy1;
left[leftOff + 4] = ax;
left[leftOff + 5] = ay;
left[leftOff + 6] = cx;
left[leftOff + 7] = cy;
}
if (right != null) {
right[rightOff + 0] = cx;
right[rightOff + 1] = cy;
right[rightOff + 2] = bx;
right[rightOff + 3] = by;
right[rightOff + 4] = cx2;
right[rightOff + 5] = cy2;
right[rightOff + 6] = x2;
right[rightOff + 7] = y2;
}
}
public static int solveCubic(double eqn[]) {
return solveCubic(eqn, eqn);
}
public static int solveCubic(double eqn[], double res[]) {
return Crossing.solveCubic(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 at, double flatness) {
return new FlatteningPathIterator(getPathIterator(at), flatness);
}
@Override
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException e) {
throw new InternalError();
}
}
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