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/*
* This class is based on the C# open source freeware library Clipper:
* http://www.angusj.com/delphi/clipper.php
* The original classes were distributed under the Boost Software License:
*
* Freeware for both open source and commercial applications
* Copyright 2010-2014 Angus Johnson
* Boost Software License - Version 1.0 - August 17th, 2003
*
* Permission is hereby granted, free of charge, to any person or organization
* obtaining a copy of the software and accompanying documentation covered by
* this license (the "Software") to use, reproduce, display, distribute,
* execute, and transmit the Software, and to prepare derivative works of the
* Software, and to permit third-parties to whom the Software is furnished to
* do so, all subject to the following:
*
* The copyright notices in the Software and this entire statement, including
* the above license grant, this restriction and the following disclaimer,
* must be included in all copies of the Software, in whole or in part, and
* all derivative works of the Software, unless such copies or derivative
* works are solely in the form of machine-executable object code generated by
* a source language processor.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package com.itextpdf.kernel.pdf.canvas.parser.clipper;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
/**
* A pure convenience class to avoid writing {@code List} everywhere.
*
* @author Tobias Mahlmann
*
*/
public class Path extends ArrayList {
static class Join {
Path.OutPt outPt1;
Path.OutPt outPt2;
private Point.LongPoint offPt;
public Point.LongPoint getOffPt() {
return offPt;
}
public void setOffPt( Point.LongPoint offPt ) {
this.offPt = offPt;
}
}
static class OutPt {
public static OutRec getLowerMostRec( OutRec outRec1, OutRec outRec2 ) {
//work out which polygon fragment has the correct hole state ...
if (outRec1.bottomPt == null) {
outRec1.bottomPt = outRec1.pts.getBottomPt();
}
if (outRec2.bottomPt == null) {
outRec2.bottomPt = outRec2.pts.getBottomPt();
}
final Path.OutPt bPt1 = outRec1.bottomPt;
final Path.OutPt bPt2 = outRec2.bottomPt;
if (bPt1.getPt().getY() > bPt2.getPt().getY()) {
return outRec1;
}
else if (bPt1.getPt().getY() < bPt2.getPt().getY()) {
return outRec2;
}
else if (bPt1.getPt().getX() < bPt2.getPt().getX()) {
return outRec1;
}
else if (bPt1.getPt().getX() > bPt2.getPt().getX()) {
return outRec2;
}
else if (bPt1.next == bPt1) {
return outRec2;
}
else if (bPt2.next == bPt2) {
return outRec1;
}
else if (isFirstBottomPt( bPt1, bPt2 )) {
return outRec1;
}
else {
return outRec2;
}
}
private static boolean isFirstBottomPt( Path.OutPt btmPt1, Path.OutPt btmPt2 ) {
Path.OutPt p = btmPt1.prev;
while (p.getPt().equals( btmPt1.getPt() ) && !p.equals( btmPt1 )) {
p = p.prev;
}
final double dx1p = Math.abs(Point.LongPoint.getDeltaX(btmPt1.getPt(), p.getPt()));
p = btmPt1.next;
while (p.getPt().equals( btmPt1.getPt() ) && !p.equals( btmPt1 )) {
p = p.next;
}
final double dx1n = Math.abs(Point.LongPoint.getDeltaX(btmPt1.getPt(), p.getPt()));
p = btmPt2.prev;
while (p.getPt().equals( btmPt2.getPt() ) && !p.equals( btmPt2 )) {
p = p.prev;
}
final double dx2p = Math.abs(Point.LongPoint.getDeltaX(btmPt2.getPt(), p.getPt()));
p = btmPt2.next;
while (p.getPt().equals( btmPt2.getPt() ) && p.equals( btmPt2 )) {
p = p.next;
}
final double dx2n = Math.abs(Point.LongPoint.getDeltaX(btmPt2.getPt(), p.getPt()));
return dx1p >= dx2p && dx1p >= dx2n || dx1n >= dx2p && dx1n >= dx2n;
}
int idx;
protected Point.LongPoint pt;
OutPt next;
OutPt prev;
public Path.OutPt duplicate( boolean InsertAfter ) {
final Path.OutPt result = new Path.OutPt();
result.setPt( new Point.LongPoint( getPt() ) );
result.idx = idx;
if (InsertAfter) {
result.next = next;
result.prev = this;
next.prev = result;
next = result;
}
else {
result.prev = prev;
result.next = this;
prev.next = result;
prev = result;
}
return result;
}
Path.OutPt getBottomPt() {
Path.OutPt dups = null;
Path.OutPt p = next;
Path.OutPt pp = this;
while (p != pp) {
if (p.getPt().getY() > pp.getPt().getY()) {
pp = p;
dups = null;
}
else if (p.getPt().getY() == pp.getPt().getY() && p.getPt().getX() <= pp.getPt().getX()) {
if (p.getPt().getX() < pp.getPt().getX()) {
dups = null;
pp = p;
}
else {
if (p.next != pp && p.prev != pp) {
dups = p;
}
}
}
p = p.next;
}
if (dups != null) {
//there appears to be at least 2 vertices at bottomPt so ...
while (dups != p) {
if (!isFirstBottomPt( p, dups )) {
pp = dups;
}
dups = dups.next;
while (!dups.getPt().equals( pp.getPt() )) {
dups = dups.next;
}
}
}
return pp;
}
public int getPointCount() {
int result = 0;
Path.OutPt p = this;
do {
result++;
p = p.next;
}
while (p != this && p != null);
return result;
}
public Point.LongPoint getPt() {
return pt;
}
public void reversePolyPtLinks() {
Path.OutPt pp1;
Path.OutPt pp2;
pp1 = this;
do {
pp2 = pp1.next;
pp1.next = pp1.prev;
pp1.prev = pp2;
pp1 = pp2;
}
while (pp1 != this);
}
public void setPt( Point.LongPoint pt ) {
this.pt = pt;
}
}
protected static class Maxima
{
protected long X;
protected Maxima Next;
protected Maxima Prev;
};
static class OutRec {
int Idx;
boolean isHole;
boolean isOpen;
OutRec firstLeft; //see comments in clipper.pas
protected Path.OutPt pts;
Path.OutPt bottomPt;
PolyNode polyNode;
public double area() {
Path.OutPt op = pts;
if (op == null) {
return 0;
}
double a = 0;
do {
a = a + (double) (op.prev.getPt().getX() + op.getPt().getX()) * (double) (op.prev.getPt().getY() - op.getPt().getY());
op = op.next;
}
while (op != pts);
return a * 0.5;
}
public void fixHoleLinkage() {
//skip if an outermost polygon or
//already already points to the correct FirstLeft ...
if (firstLeft == null || isHole != firstLeft.isHole && firstLeft.pts != null) {
return;
}
OutRec orfl = firstLeft;
while (orfl != null && (orfl.isHole == isHole || orfl.pts == null)) {
orfl = orfl.firstLeft;
}
firstLeft = orfl;
}
public Path.OutPt getPoints() {
return pts;
}
public void setPoints( Path.OutPt pts ) {
this.pts = pts;
}
}
private static Path.OutPt excludeOp( Path.OutPt op ) {
final Path.OutPt result = op.prev;
result.next = op.next;
op.next.prev = result;
result.idx = 0;
return result;
}
/**
*
*/
private static final long serialVersionUID = -7120161578077546673L;
public Path() {
super();
}
public Path(Point.LongPoint[] points) {
this();
for (Point.LongPoint point : points) {
add(point);
}
}
public Path( int cnt ) {
super( cnt );
}
public Path(Collection c) {
super(c);
}
public double area() {
final int cnt = size();
if (cnt < 3) {
return 0;
}
double a = 0;
for (int i = 0, j = cnt - 1; i < cnt; ++i) {
a += ((double) get( j ).getX() + get( i ).getX()) * ((double) get( j ).getY() - get( i ).getY());
j = i;
}
return -a * 0.5;
}
public Path cleanPolygon() {
return cleanPolygon( 1.415 );
}
public Path cleanPolygon( double distance ) {
//distance = proximity in units/pixels below which vertices will be stripped.
//Default ~= sqrt(2) so when adjacent vertices or semi-adjacent vertices have
//both x & y coords within 1 unit, then the second vertex will be stripped.
int cnt = size();
if (cnt == 0) {
return new Path();
}
Path.OutPt[] outPts = new Path.OutPt[cnt];
for (int i = 0; i < cnt; ++i) {
outPts[i] = new Path.OutPt();
}
for (int i = 0; i < cnt; ++i) {
outPts[i].pt = get( i );
outPts[i].next = outPts[(i + 1) % cnt];
outPts[i].next.prev = outPts[i];
outPts[i].idx = 0;
}
final double distSqrd = distance * distance;
Path.OutPt op = outPts[0];
while (op.idx == 0 && op.next != op.prev) {
if (Point.arePointsClose( op.pt, op.prev.pt, distSqrd )) {
op = excludeOp( op );
cnt--;
}
else if (Point.arePointsClose( op.prev.pt, op.next.pt, distSqrd )) {
excludeOp( op.next );
op = excludeOp( op );
cnt -= 2;
}
else if (Point.slopesNearCollinear( op.prev.pt, op.pt, op.next.pt, distSqrd )) {
op = excludeOp( op );
cnt--;
}
else {
op.idx = 1;
op = op.next;
}
}
if (cnt < 3) {
cnt = 0;
}
final Path result = new Path( cnt );
for (int i = 0; i < cnt; ++i) {
result.add( op.pt );
op = op.next;
}
outPts = null;
return result;
}
public int isPointInPolygon( Point.LongPoint pt ) {
//returns 0 if false, +1 if true, -1 if pt ON polygon boundary
//See "The Point in Polygon Problem for Arbitrary Polygons" by Hormann & Agathos
//http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.5498&rep=rep1&type=pdf
int result = 0;
final int cnt = size();
if (cnt < 3) {
return 0;
}
Point.LongPoint ip = get( 0 );
for (int i = 1; i <= cnt; ++i) {
final Point.LongPoint ipNext = i == cnt ? get( 0 ) : get( i );
if (ipNext.getY() == pt.getY()) {
if (ipNext.getX() == pt.getX() || ip.getY() == pt.getY() && ipNext.getX() > pt.getX() == ip.getX() < pt.getX()) {
return -1;
}
}
if (ip.getY() < pt.getY() != ipNext.getY() < pt.getY()) {
if (ip.getX() >= pt.getX()) {
if (ipNext.getX() > pt.getX()) {
result = 1 - result;
}
else {
final double d = (double) (ip.getX() - pt.getX()) * (ipNext.getY() - pt.getY()) - (double) (ipNext.getX() - pt.getX())
* (ip.getY() - pt.getY());
if (d == 0) {
return -1;
}
else if (d > 0 == ipNext.getY() > ip.getY()) {
result = 1 - result;
}
}
}
else {
if (ipNext.getX() > pt.getX()) {
final double d = (double) (ip.getX() - pt.getX()) * (ipNext.getY() - pt.getY()) - (double) (ipNext.getX() - pt.getX())
* (ip.getY() - pt.getY());
if (d == 0) {
return -1;
}
else if (d > 0 == ipNext.getY() > ip.getY()) {
result = 1 - result;
}
}
}
}
ip = ipNext;
}
return result;
}
public boolean orientation() {
return area() >= 0;
}
public void reverse() {
Collections.reverse(this);
}
public Path TranslatePath( Point.LongPoint delta ) {
final Path outPath = new Path( size() );
for (int i = 0; i < size(); i++) {
outPath.add( new Point.LongPoint( get( i ).getX() + delta.getX(), get( i ).getY() + delta.getY() ) );
}
return outPath;
}
}
