public LinearRing nextLinearRing(final Envelope envelope) {
LinearRing result;
do {
final CoordinateList cl = new CoordinateList(nextLineString(envelope).getCoordinates());
cl.closeRing();
result = gf.createLinearRing(cl.toCoordinateArray());
} while (!result.isValid());
return result;
}
private static void addEdge(Coordinate[] coords, boolean isForward, CoordinateList coordList) {
if (isForward) {
for (int i = 0; i < coords.length; i++) {
coordList.add(coords[i], false);
}
} else {
for (int i = coords.length - 1; i >= 0; i--) {
coordList.add(coords[i], false);
}
}
}
public Coordinate[] simplify() {
usePt = new boolean[pts.length];
for (int i = 0; i < pts.length; i++) {
usePt[i] = true;
}
simplifySection(0, pts.length - 1);
CoordinateList coordList = new CoordinateList();
for (int i = 0; i < pts.length; i++) {
if (usePt[i]) coordList.add(new Coordinate(pts[i]));
}
return coordList.toCoordinateArray();
}
/**
* Computes the list of coordinates which are contained in this ring. The coordinatea are computed
* once only and cached.
*
* @return an array of the {@link Coordinate}s in this ring
*/
private Coordinate[] getCoordinates() {
if (ringPts == null) {
CoordinateList coordList = new CoordinateList();
for (Iterator i = deList.iterator(); i.hasNext(); ) {
DirectedEdge de = (DirectedEdge) i.next();
PolygonizeEdge edge = (PolygonizeEdge) de.getEdge();
addEdge(edge.getLine().getCoordinates(), de.getEdgeDirection(), coordList);
}
ringPts = coordList.toCoordinateArray();
}
return ringPts;
}
private void densify(Coordinate p0, Coordinate p1, double segLength) {
double origLen = p1.distance(p0);
int nPtsToAdd = (int) Math.floor(origLen / segLength);
double delx = p1.x - p0.x;
double dely = p1.y - p0.y;
double segLenFrac = segLength / origLen;
for (int i = 0; i <= nPtsToAdd; i++) {
double addedPtFrac = i * segLenFrac;
Coordinate pt = new Coordinate(p0.x + addedPtFrac * delx, p0.y + addedPtFrac * dely);
newCoords.add(pt, false);
}
newCoords.add(new Coordinate(p1), false);
}
public Geometry densify(double segLength) {
newCoords = new CoordinateList();
CoordinateSequence seq = inputLine.getCoordinateSequence();
Coordinate p0 = new Coordinate();
Coordinate p1 = new Coordinate();
seq.getCoordinate(0, p0);
newCoords.add(new Coordinate(p0));
for (int i = 0; i < seq.size() - 1; i++) {
seq.getCoordinate(i, p0);
seq.getCoordinate(i + 1, p1);
densify(p0, p1, segLength);
}
Coordinate[] newPts = newCoords.toCoordinateArray();
return inputLine.getFactory().createLineString(newPts);
}
public Coordinate[] edit(Coordinate[] coordinates, Geometry geom) {
if (coordinates.length == 0) return null;
Coordinate[] reducedCoords = new Coordinate[coordinates.length];
// copy coordinates and reduce
for (int i = 0; i < coordinates.length; i++) {
Coordinate coord = new Coordinate(coordinates[i]);
targetPM.makePrecise(coord);
reducedCoords[i] = coord;
}
// remove repeated points, to simplify returned geometry as much as possible
CoordinateList noRepeatedCoordList = new CoordinateList(reducedCoords, false);
Coordinate[] noRepeatedCoords = noRepeatedCoordList.toCoordinateArray();
/**
* Check to see if the removal of repeated points collapsed the coordinate List to an invalid
* length for the type of the parent geometry. It is not necessary to check for Point collapses,
* since the coordinate list can never collapse to less than one point. If the length is
* invalid, return the full-length coordinate array first computed, or null if collapses are
* being removed. (This may create an invalid geometry - the client must handle this.)
*/
int minLength = 0;
if (geom instanceof LineString) minLength = 2;
if (geom instanceof LinearRing) minLength = 4;
Coordinate[] collapsedCoords = reducedCoords;
if (removeCollapsed) collapsedCoords = null;
// return null or orginal length coordinate array
if (noRepeatedCoords.length < minLength) {
return collapsedCoords;
}
// ok to return shorter coordinate array
return noRepeatedCoords;
}
