private FeatureCollection convexHhull(TaskMonitor monitor, FeatureCollection fc) {
monitor.allowCancellationRequests();
monitor.report(I18N.get("ui.plugin.analysis.ConvexHullPlugIn.Computing-Convex-Hull") + "...");
int size = fc.size();
GeometryFactory geomFact = null;
if (size == 0) {
return null;
}
int count = 0;
Geometry[] geoms = new Geometry[size];
for (Iterator i = fc.iterator(); i.hasNext(); ) {
Feature f = (Feature) i.next();
Geometry geom = f.getGeometry();
if (geom == null) {
continue;
}
if (geomFact == null) {
geomFact = geom.getFactory();
}
geoms[count++] = geom;
}
GeometryCollection gc = geomFact.createGeometryCollection(geoms);
Geometry hull = gc.convexHull();
List hullList = new ArrayList();
hullList.add(hull);
return FeatureDatasetFactory.createFromGeometry(hullList);
}
public Geometry buffer(Geometry g, double distance) {
PrecisionModel precisionModel = workingPrecisionModel;
if (precisionModel == null) precisionModel = g.getPrecisionModel();
// factory must be the same as the one used by the input
geomFact = g.getFactory();
OffsetCurveBuilder curveBuilder = new OffsetCurveBuilder(precisionModel, bufParams);
OffsetCurveSetBuilder curveSetBuilder = new OffsetCurveSetBuilder(g, distance, curveBuilder);
List bufferSegStrList = curveSetBuilder.getCurves();
// short-circuit test
if (bufferSegStrList.size() <= 0) {
return createEmptyResultGeometry();
}
// BufferDebug.runCount++;
// String filename = "run" + BufferDebug.runCount + "_curves";
// System.out.println("saving " + filename);
// BufferDebug.saveEdges(bufferEdgeList, filename);
// DEBUGGING ONLY
// WKTWriter wktWriter = new WKTWriter();
// Debug.println("Rings: " + wktWriter.write(convertSegStrings(bufferSegStrList.iterator())));
// wktWriter.setMaxCoordinatesPerLine(10);
// System.out.println(wktWriter.writeFormatted(convertSegStrings(bufferSegStrList.iterator())));
computeNodedEdges(bufferSegStrList, precisionModel);
graph = new PlanarGraph(new OverlayNodeFactory());
graph.addEdges(edgeList.getEdges());
List subgraphList = createSubgraphs(graph);
PolygonBuilder polyBuilder = new PolygonBuilder(geomFact);
buildSubgraphs(subgraphList, polyBuilder);
List resultPolyList = polyBuilder.getPolygons();
// just in case...
if (resultPolyList.size() <= 0) {
return createEmptyResultGeometry();
}
Geometry resultGeom = geomFact.buildGeometry(resultPolyList);
return resultGeom;
}
public final Geometry transform(Geometry inputGeom) {
this.inputGeom = inputGeom;
this.factory = inputGeom.getFactory();
if (inputGeom instanceof Point) return transformPoint((Point) inputGeom, null);
if (inputGeom instanceof MultiPoint) return transformMultiPoint((MultiPoint) inputGeom, null);
if (inputGeom instanceof LinearRing) return transformLinearRing((LinearRing) inputGeom, null);
if (inputGeom instanceof LineString) return transformLineString((LineString) inputGeom, null);
if (inputGeom instanceof MultiLineString)
return transformMultiLineString((MultiLineString) inputGeom, null);
if (inputGeom instanceof Polygon) return transformPolygon((Polygon) inputGeom, null);
if (inputGeom instanceof MultiPolygon)
return transformMultiPolygon((MultiPolygon) inputGeom, null);
if (inputGeom instanceof GeometryCollection)
return transformGeometryCollection((GeometryCollection) inputGeom, null);
throw new IllegalArgumentException(
"Unknown Geometry subtype: " + inputGeom.getClass().getName());
}
private Geometry editInternal(Geometry geometry, GeometryEditorOperation operation) {
// if client did not supply a GeometryFactory, use the one from the input Geometry
if (factory == null) factory = geometry.getFactory();
if (geometry instanceof GeometryCollection) {
return editGeometryCollection((GeometryCollection) geometry, operation);
}
if (geometry instanceof Polygon) {
return editPolygon((Polygon) geometry, operation);
}
if (geometry instanceof Point) {
return operation.edit(geometry, factory);
}
if (geometry instanceof LineString) {
return operation.edit(geometry, factory);
}
Assert.shouldNeverReachHere("Unsupported Geometry class: " + geometry.getClass().getName());
return null;
}
public static Geometry replace(Geometry parent, Geometry original, Geometry replacement) {
List elem = extractElements(parent, false);
Collections.replaceAll(elem, original, replacement);
return parent.getFactory().buildGeometry(elem);
}
public static Point createPointFromInternalCoord(Coordinate coord, Geometry exemplar) {
exemplar.getPrecisionModel().makePrecise(coord);
return exemplar.getFactory().createPoint(coord);
}
