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/*
* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package com.sun.javafx.geom;
import java.util.Vector;
import java.util.Enumeration;
public abstract class Crossings {
public static final boolean debug = false;
int limit = 0;
double yranges[] = new double[10];
double xlo, ylo, xhi, yhi;
public Crossings(double xlo, double ylo, double xhi, double yhi) {
this.xlo = xlo;
this.ylo = ylo;
this.xhi = xhi;
this.yhi = yhi;
}
public final double getXLo() {
return xlo;
}
public final double getYLo() {
return ylo;
}
public final double getXHi() {
return xhi;
}
public final double getYHi() {
return yhi;
}
public abstract void record(double ystart, double yend, int direction);
public void print() {
System.out.println("Crossings [");
System.out.println(" bounds = ["+ylo+", "+yhi+"]");
for (int i = 0; i < limit; i += 2) {
System.out.println(" ["+yranges[i]+", "+yranges[i+1]+"]");
}
System.out.println("]");
}
public final boolean isEmpty() {
return (limit == 0);
}
public abstract boolean covers(double ystart, double yend);
public static Crossings findCrossings(Vector curves,
double xlo, double ylo,
double xhi, double yhi)
{
Crossings cross = new EvenOdd(xlo, ylo, xhi, yhi);
Enumeration enum_ = curves.elements();
while (enum_.hasMoreElements()) {
Curve c = (Curve) enum_.nextElement();
if (c.accumulateCrossings(cross)) {
return null;
}
}
if (debug) {
cross.print();
}
return cross;
}
public final static class EvenOdd extends Crossings {
public EvenOdd(double xlo, double ylo, double xhi, double yhi) {
super(xlo, ylo, xhi, yhi);
}
public final boolean covers(double ystart, double yend) {
return (limit == 2 && yranges[0] <= ystart && yranges[1] >= yend);
}
public void record(double ystart, double yend, int direction) {
if (ystart >= yend) {
return;
}
int from = 0;
// Quickly jump over all pairs that are completely "above"
while (from < limit && ystart > yranges[from+1]) {
from += 2;
}
int to = from;
while (from < limit) {
double yrlo = yranges[from++];
double yrhi = yranges[from++];
if (yend < yrlo) {
// Quickly handle insertion of the new range
yranges[to++] = ystart;
yranges[to++] = yend;
ystart = yrlo;
yend = yrhi;
continue;
}
// The ranges overlap - sort, collapse, insert, iterate
double yll, ylh, yhl, yhh;
if (ystart < yrlo) {
yll = ystart;
ylh = yrlo;
} else {
yll = yrlo;
ylh = ystart;
}
if (yend < yrhi) {
yhl = yend;
yhh = yrhi;
} else {
yhl = yrhi;
yhh = yend;
}
if (ylh == yhl) {
ystart = yll;
yend = yhh;
} else {
if (ylh > yhl) {
ystart = yhl;
yhl = ylh;
ylh = ystart;
}
if (yll != ylh) {
yranges[to++] = yll;
yranges[to++] = ylh;
}
ystart = yhl;
yend = yhh;
}
if (ystart >= yend) {
break;
}
}
if (to < from && from < limit) {
System.arraycopy(yranges, from, yranges, to, limit-from);
}
to += (limit-from);
if (ystart < yend) {
if (to >= yranges.length) {
double newranges[] = new double[to+10];
System.arraycopy(yranges, 0, newranges, 0, to);
yranges = newranges;
}
yranges[to++] = ystart;
yranges[to++] = yend;
}
limit = to;
}
}
}
