/*
* Geotoolkit - An Open Source Java GIS Toolkit
* http://www.geotoolkit.org
*
* (C) 2008 - 2009, Geomatys
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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
* Lesser General Public License for more details.
*/
package org.geotoolkit.display2d.primitive.jts;
import com.vividsolutions.jts.geom.CoordinateSequence;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.Polygon;
import java.awt.geom.AffineTransform;
/**
* Simple and efficient path iterator for JTS Polygon.
*
* @author Johann Sorel (Puzzle-GIS)
* @module
* @since 2.9
*/
public final class JTSPolygonIterator extends JTSGeometryIterator<Polygon> {
/** The rings describing the polygon geometry */
private LineString[] rings;
/** The current ring during iteration */
private int currentRing = 0;
/** Current line coordinate */
private int currentCoord = 0;
/** The array of coordinates that represents the line geometry */
private CoordinateSequence coords = null;
private int csSize = 0;
/** True when the iteration is terminated */
private boolean done = false;
/**
* Creates a new PolygonIterator object.
*
* @param p The polygon
* @param trs The affine transform applied to coordinates during iteration
*/
public JTSPolygonIterator(final Polygon p, final AffineTransform trs) {
super(p,trs);
setGeometry(p);
}
@Override
public void setGeometry(final Polygon geom) {
this.geometry = geom;
if(geom != null){
int numInteriorRings = geom.getNumInteriorRing();
rings = new LineString[numInteriorRings + 1];
rings[0] = geom.getExteriorRing();
for (int i = 0; i < numInteriorRings; i++) {
rings[i + 1] = geom.getInteriorRingN(i);
}
}
reset();
}
/**
* {@inheritDoc }
*/
@Override
public void reset(){
currentRing = 0;
currentCoord = 0;
coords = rings[0].getCoordinateSequence();
csSize = coords.size()-1;
done = false;
}
/**
* {@inheritDoc }
*/
@Override
public int currentSegment(final double[] coords) {
// first make sure we're not at the last element, this prevents us from exceptions
// in the case where coords.size() == 0
if (currentCoord == csSize) {
return SEG_CLOSE;
} else if (currentCoord == 0) {
coords[0] = this.coords.getX(0);
coords[1] = this.coords.getY(0);
transform.transform(coords, 0, coords, 0, 1);
return SEG_MOVETO;
} else {
coords[0] = this.coords.getX(currentCoord);
coords[1] = this.coords.getY(currentCoord);
transform.transform(coords, 0, coords, 0, 1);
return SEG_LINETO;
}
}
/**
* {@inheritDoc }
*/
@Override
public int currentSegment(final float[] coords) {
// first make sure we're not at the last element, this prevents us from exceptions
// in the case where coords.size() == 0
if (currentCoord == csSize) {
return SEG_CLOSE;
} else if (currentCoord == 0) {
coords[0] = (float)this.coords.getX(0);
coords[1] = (float)this.coords.getY(0);
transform.transform(coords, 0, coords, 0, 1);
return SEG_MOVETO;
} else {
coords[0] = (float)this.coords.getX(currentCoord);
coords[1] = (float)this.coords.getY(currentCoord);
transform.transform(coords, 0, coords, 0, 1);
return SEG_LINETO;
}
}
/**
* {@inheritDoc }
*/
@Override
public int getWindingRule() {
return WIND_EVEN_ODD;
}
/**
* {@inheritDoc }
*/
@Override
public boolean isDone() {
return done;
}
/**
* {@inheritDoc }
*/
@Override
public void next() {
if (currentCoord == csSize) {
if (currentRing < (rings.length - 1)) {
currentCoord = 0;
currentRing++;
coords = rings[currentRing].getCoordinateSequence();
csSize = coords.size()-1;
} else {
done = true;
}
} else {
currentCoord++;
}
}
}