/*
* This is part of Geomajas, a GIS framework, http://www.geomajas.org/.
*
* Copyright 2008-2011 Geosparc nv, http://www.geosparc.com/, Belgium.
*
* The program is available in open source according to the GNU Affero
* General Public License. All contributions in this program are covered
* by the Geomajas Contributors License Agreement. For full licensing
* details, see LICENSE.txt in the project root.
*/
package org.geomajas.gwt.client.spatial.geometry.operation;
import org.geomajas.geometry.Coordinate;
import org.geomajas.gwt.client.spatial.geometry.Geometry;
import org.geomajas.gwt.client.spatial.geometry.LineString;
import org.geomajas.gwt.client.spatial.geometry.LinearRing;
import org.geomajas.gwt.client.spatial.geometry.MultiLineString;
import org.geomajas.gwt.client.spatial.geometry.MultiPoint;
import org.geomajas.gwt.client.spatial.geometry.MultiPolygon;
import org.geomajas.gwt.client.spatial.geometry.Point;
import org.geomajas.gwt.client.spatial.geometry.Polygon;
/**
* This operation translates an entire {@link Geometry} to another location.
*
* @author Pieter De Graef
*/
public class TranslateGeometryOperation implements GeometryOperation {
/**
* Translation value along the X-axis.
*/
private double translateX;
/**
* Translation value along the Y-axis.
*/
private double translateY;
/**
* This constructor sets all the necessary parameter values.
*
* @param translateX
* Translation value along the X-axis.
* @param translateY
* Translation value along the Y-axis.
*/
public TranslateGeometryOperation(double translateX, double translateY) {
this.translateX = translateX;
this.translateY = translateY;
}
/**
* Execute the operation!
*
* @return Returns a new geometry. If the given geometry is null, then null is returned.
*/
public Geometry execute(Geometry geometry) {
if (geometry == null) {
return null;
}
if (geometry instanceof Point) {
return translate((Point) geometry);
} else if (geometry instanceof LinearRing) {
return translate((LinearRing) geometry);
} else if (geometry instanceof LineString) {
return translate((LineString) geometry);
} else if (geometry instanceof Polygon) {
return translate((Polygon) geometry);
} else if (geometry instanceof MultiPoint) {
return translate((MultiPoint) geometry);
} else if (geometry instanceof MultiLineString) {
return translate((MultiLineString) geometry);
} else if (geometry instanceof MultiPolygon) {
return translate((MultiPolygon) geometry);
}
return null;
}
//-------------------------------------------------------------------------
// Private functions translating every type of geometry:
//-------------------------------------------------------------------------
private Point translate(Point point) {
Coordinate c = point.getCoordinate();
return point.getGeometryFactory().createPoint(new Coordinate(c.getX() + translateX, c.getY() + translateY));
}
private LineString translate(LineString lineString) {
Coordinate[] coordinates = new Coordinate[lineString.getNumPoints()];
for (int n = 0; n < lineString.getNumPoints(); n++) {
Coordinate original = lineString.getCoordinateN(n);
coordinates[n] = new Coordinate(original.getX() + translateX, original.getY() + translateY);
}
return lineString.getGeometryFactory().createLineString(coordinates);
}
private LinearRing translate(LinearRing linearRing) {
Coordinate[] coordinates = new Coordinate[linearRing.getNumPoints()];
for (int n = 0; n < linearRing.getNumPoints(); n++) {
Coordinate original = linearRing.getCoordinateN(n);
coordinates[n] = new Coordinate(original.getX() + translateX, original.getY() + translateY);
}
return linearRing.getGeometryFactory().createLinearRing(coordinates);
}
private Polygon translate(Polygon polygon) {
LinearRing exteriorRing = translate(polygon.getExteriorRing());
LinearRing[] interiorRings = new LinearRing[polygon.getNumInteriorRing()];
for (int n = 0; n < polygon.getNumInteriorRing(); n++) {
interiorRings[n] = translate(polygon.getInteriorRingN(n));
}
return polygon.getGeometryFactory().createPolygon(exteriorRing, interiorRings);
}
private MultiPoint translate(MultiPoint multiPoint) {
Point[] points = new Point[multiPoint.getNumGeometries()];
for (int n = 0; n < multiPoint.getNumGeometries(); n++) {
points[n] = translate((Point) multiPoint.getGeometryN(n));
}
return multiPoint.getGeometryFactory().createMultiPoint(points);
}
private MultiLineString translate(MultiLineString multiLineString) {
LineString[] lineStrings = new LineString[multiLineString.getNumGeometries()];
for (int n = 0; n < multiLineString.getNumGeometries(); n++) {
lineStrings[n] = translate((LineString) multiLineString.getGeometryN(n));
}
return multiLineString.getGeometryFactory().createMultiLineString(lineStrings);
}
private MultiPolygon translate(MultiPolygon multiPolygon) {
Polygon[] polygons = new Polygon[multiPolygon.getNumGeometries()];
for (int n = 0; n < multiPolygon.getNumGeometries(); n++) {
polygons[n] = translate((Polygon) multiPolygon.getGeometryN(n));
}
return multiPolygon.getGeometryFactory().createMultiPolygon(polygons);
}
}