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A simple class to create random test data with GeoTools
package com.ianturton.cookbook.utilities;
import java.util.ArrayList;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.Point;
import com.vividsolutions.jts.geom.Polygon;
public class GenerateRandomData {
public static SimpleFeature createSimplePointFeature(SimpleFeatureType schema) {
SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(schema);
double latitude = (Math.random() * 180.0) - 90.0;
double longitude = (Math.random() * 360.0) - 180.0;
String name = "thing" + Math.random();
int number = (int) Math.round(Math.random() * 10.0);
GeometryFactory geometryFactory = new GeometryFactory();
/* Longitude (= x coord) first ! */
com.vividsolutions.jts.geom.Point point = geometryFactory.createPoint(new Coordinate(longitude, latitude));
featureBuilder.add(point);
/* featureBuilder.add(name);
featureBuilder.add(number);*/
SimpleFeature feature = featureBuilder.buildFeature(null);
return feature;
}
public static SimpleFeature createSimpleLineFeature(SimpleFeatureType schema) {
SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(schema);
LineString line = createRandomLineString(5);
featureBuilder.add(line);
SimpleFeature feature = featureBuilder.buildFeature(null);
return feature;
}
/**
* @return
*/
public static LineString createRandomLineString(int n) {
double latitude = (Math.random() * 180.0) - 90.0;
double longitude = (Math.random() * 360.0) - 180.0;
GeometryFactory geometryFactory = new GeometryFactory();
/* Longitude (= x coord) first ! */
ArrayList<Coordinate> points = new ArrayList<Coordinate>();
points.add(new Coordinate(longitude, latitude));
for (int i = 1; i < n; i++) {
double deltaX = (Math.random() * 10.0) - 5.0;
double deltaY = (Math.random() * 10.0) - 5.0;
longitude += deltaX;
latitude += deltaY;
points.add(new Coordinate(longitude, latitude));
}
LineString line = geometryFactory.createLineString((Coordinate[]) points.toArray(new Coordinate[] {}));
return line;
}
public static SimpleFeature createSimplePolygonFeature(SimpleFeatureType schema) {
SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(schema);
Polygon poly = createRandomPolygon(5);
featureBuilder.add(poly);
SimpleFeature feature = featureBuilder.buildFeature(null);
return feature;
}
public static Polygon createRandomPolygon(int n) {
double latitude = (Math.random() * 180.0) - 90.0;
double longitude = (Math.random() * 360.0) - 180.0;
GeometryFactory geometryFactory = new GeometryFactory();
/* Longitude (= x coord) first ! */
Polygon poly = null;
boolean valid = false;
while (!valid) {
ArrayList<Coordinate> points = new ArrayList<Coordinate>();
points.add(new Coordinate(longitude, latitude));
double lon = longitude;
double lat = latitude;
for (int i = 1; i < n; i++) {
double deltaX = (Math.random() * 10.0) - 5.0;
double deltaY = (Math.random() * 10.0) - 5.0;
lon += deltaX;
lat += deltaY;
points.add(new Coordinate(lon, lat));
}
points.add(new Coordinate(longitude, latitude));
poly = geometryFactory.createPolygon((Coordinate[]) points.toArray(new Coordinate[] {}));
valid = poly.isValid();
}
return poly;
}
public static Point createRandomPoint() {
double latitude = (Math.random() * 180.0) - 90.0;
double longitude = (Math.random() * 360.0) - 180.0;
GeometryFactory geometryFactory = new GeometryFactory();
/* Longitude (= x coord) first ! */
com.vividsolutions.jts.geom.Point point = geometryFactory.createPoint(new Coordinate(longitude, latitude));
return point;
}
}
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