/**
* Split the graph by splitting an Edge at a point into 2 Edges
*
* @param c coordinates at which to split the graph
* @param iSplit split index (the i-th split point, used to create the new edge IDs)
*/
public void splitGraphAtPoint(Coordinate c, int iSplit) {
Edge nearestEdge = null;
float nearestDist = kNearestEdgeDistance;
while (nearestEdge == null && nearestDist / kNearestEdgeDistance < 20.) {
nearestEdge = findNearestEdge(c, nearestDist);
if (nearestEdge == null) {
nearestDist *= 2.;
logger.info("Increasing kNearestEdgeDistance: " + nearestDist);
}
}
// get the projected point on the nearest edge
PointPairDistance ppd = new PointPairDistance();
@SuppressWarnings("rawtypes")
LineString nearestLineString = (LineString) ((HashMap) nearestEdge.getData()).get("geom");
EuclideanDistanceToPoint.computeDistance(nearestLineString, c, ppd);
Coordinate resultcoord = null;
for (Coordinate cc : ppd.getCoordinates()) {
// System.out.println(cc);
if (cc.equals(c) == false) {
resultcoord = cc;
}
}
// let us loop through the vertices
Coordinate[] nearestLineStringCoordinates = nearestLineString.getCoordinates();
ArrayList<Coordinate> fromVertices = new ArrayList<Coordinate>();
ArrayList<Coordinate> toVertices = new ArrayList<Coordinate>();
fromVertices.add(nearestLineStringCoordinates[0]);
boolean isAfter = false;
for (int i = 1; i < nearestLineStringCoordinates.length; i++) {
Coordinate pt0 = nearestLineStringCoordinates[i - 1];
Coordinate pt1 = nearestLineStringCoordinates[i];
// let us build a segment between 2 nodes
Coordinate[] segmentCoords = {pt0, pt1};
LineString segment = fact.createLineString(segmentCoords);
// let us check whether the projected point (resultcoord) is on the node
if (fact.createPoint(resultcoord).distance(segment) < SPLITSNAPDISTANCE) {
// point within, let us split
fromVertices.add(resultcoord);
toVertices.add(resultcoord);
isAfter = true;
} else {
if (!isAfter) {
fromVertices.add(nearestLineStringCoordinates[i]);
} else {
toVertices.add(nearestLineStringCoordinates[i]);
}
}
}
// if (nearestLineStringCoordinates.length==2) {
toVertices.add(nearestLineStringCoordinates[nearestLineStringCoordinates.length - 1]);
// }
// TODO: generate nice edge ids here
int id1 = -2 * iSplit - 1;
int id2 = -2 * iSplit - 2;
// replace straight lines with lines including vertices
Coordinate[] fromArray = new Coordinate[fromVertices.size()];
Coordinate[] toArray = new Coordinate[toVertices.size()];
fromVertices.toArray(fromArray);
toVertices.toArray(toArray);
addLineString(fact.createLineString(fromArray), id1);
addLineString(fact.createLineString(toArray), id2);
this.removeEdge(nearestEdge);
System.out.println("Graph split @ " + resultcoord);
}
