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The JTS Topology Suite is an API for modelling and
manipulating 2-dimensional linear geometry. It provides
numerous geometric predicates and functions. JTS
conforms to the Simple Features Specification for
SQL published by the Open GIS Consortium.
/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* 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; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.vividsolutions.jtsexample.geom;
import com.vividsolutions.jts.geom.*;
/**
* Demonstrates how to implement a CoordinateSequence for a new kind of
* coordinate (an {@link ExtendedCoordinate} in this example). In this
* implementation, Coordinates returned by #toArray and #get are live -- parties
* that change them are actually changing the ExtendedCoordinateSequence's
* underlying data.
*
* @version 1.7
*/
public class ExtendedCoordinateSequence
implements CoordinateSequence
{
public static ExtendedCoordinate[] copy(Coordinate[] coordinates)
{
ExtendedCoordinate[] copy = new ExtendedCoordinate[coordinates.length];
for (int i = 0; i < coordinates.length; i++) {
copy[i] = new ExtendedCoordinate(coordinates[i]);
}
return copy;
}
public static ExtendedCoordinate[] copy(CoordinateSequence coordSeq)
{
ExtendedCoordinate[] copy = new ExtendedCoordinate[coordSeq.size()];
for (int i = 0; i < coordSeq.size(); i++) {
copy[i] = new ExtendedCoordinate(coordSeq.getCoordinate(i));
}
return copy;
}
private ExtendedCoordinate[] coordinates;
/**
* Copy constructor -- simply aliases the input array, for better performance.
*/
public ExtendedCoordinateSequence(ExtendedCoordinate[] coordinates) {
this.coordinates = coordinates;
}
/**
* Constructor that makes a copy of an array of Coordinates.
* Always makes a copy of the input array, since the actual class
* of the Coordinates in the input array may be different from ExtendedCoordinate.
*/
public ExtendedCoordinateSequence(Coordinate[] copyCoords) {
coordinates = copy(copyCoords);
}
/**
* Constructor that makes a copy of a CoordinateSequence.
*/
public ExtendedCoordinateSequence(CoordinateSequence coordSeq) {
coordinates = copy(coordSeq);
}
/**
* Constructs a sequence of a given size, populated
* with new {@link ExtendedCoordinate}s.
*
* @param size the size of the sequence to create
*/
public ExtendedCoordinateSequence(int size) {
coordinates = new ExtendedCoordinate[size];
for (int i = 0; i < size; i++) {
coordinates[i] = new ExtendedCoordinate();
}
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getDimension()
*/
public int getDimension() { return 4; }
public Coordinate getCoordinate(int i) {
return coordinates[i];
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getX(int)
*/
public Coordinate getCoordinateCopy(int index) {
return new Coordinate(coordinates[index]);
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getX(int)
*/
public void getCoordinate(int index, Coordinate coord) {
coord.x = coordinates[index].x;
coord.y = coordinates[index].y;
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getX(int)
*/
public double getX(int index) {
return coordinates[index].x;
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getY(int)
*/
public double getY(int index) {
return coordinates[index].y;
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#getOrdinate(int, int)
*/
public double getOrdinate(int index, int ordinateIndex)
{
switch (ordinateIndex) {
case CoordinateSequence.X: return coordinates[index].x;
case CoordinateSequence.Y: return coordinates[index].y;
case CoordinateSequence.Z: return coordinates[index].z;
case CoordinateSequence.M: return coordinates[index].getM();
}
return Double.NaN;
}
/**
* @see com.vividsolutions.jts.geom.CoordinateSequence#setOrdinate(int, int, double)
*/
public void setOrdinate(int index, int ordinateIndex, double value)
{
switch (ordinateIndex) {
case CoordinateSequence.X:
coordinates[index].x = value;
break;
case CoordinateSequence.Y:
coordinates[index].y = value;
break;
case CoordinateSequence.Z:
coordinates[index].z = value;
break;
case CoordinateSequence.M:
coordinates[index].setM(value);
break;
}
}
public Object clone() {
ExtendedCoordinate[] cloneCoordinates = new ExtendedCoordinate[size()];
for (int i = 0; i < coordinates.length; i++) {
cloneCoordinates[i] = (ExtendedCoordinate) coordinates[i].clone();
}
return new ExtendedCoordinateSequence(cloneCoordinates);
}
public int size() {
return coordinates.length;
}
public Coordinate[] toCoordinateArray() {
return coordinates;
}
public Envelope expandEnvelope(Envelope env)
{
for (int i = 0; i < coordinates.length; i++ ) {
env.expandToInclude(coordinates[i]);
}
return env;
}
public String toString()
{
StringBuffer strBuf = new StringBuffer();
strBuf.append("ExtendedCoordinateSequence [");
for (int i = 0; i < coordinates.length; i++) {
if (i > 0) strBuf.append(", ");
strBuf.append(coordinates[i]);
}
strBuf.append("]");
return strBuf.toString();
}
}