/**
* Compute the intersection point according the steepest vector. We assume that the point is in
* the Triangle
*
* @param dPoint
* @return DPoint
* @throws DelaunayError
*/
public final DPoint getSteepestIntersectionPoint(DPoint dPoint) throws DelaunayError {
if (isInside(dPoint)) {
for (DEdge dEdge : edges) {
if (isTopoOrientedToEdge(dEdge)) {
DPoint pt =
Tools.computeIntersection(
dEdge.getStartPoint(), dEdge.getDirectionVector(), dPoint, getSteepestVector());
if (dEdge.contains(pt)) {
return pt;
}
}
}
}
return null;
}
/**
* Compute the intersection point according to the vector opposite to the steepest vector. If dp
* is outside the triangle, we return null.
*
* @param dp
* @return The point pt of the triangle's boundary for which (dp pt) is colinear to the steepest
* vector.
* @throws DelaunayError
*/
public final DPoint getCounterSteepestIntersection(DPoint dp) throws DelaunayError {
if (isInside(dp) || isOnAnEdge(dp)) {
for (DEdge ed : edges) {
if (!isTopoOrientedToEdge(ed)) {
DPoint counterSteep = getSteepestVector();
counterSteep.setX(-counterSteep.getX());
counterSteep.setY(-counterSteep.getY());
counterSteep.setZ(-counterSteep.getZ());
DPoint pt =
Tools.computeIntersection(
ed.getStartPoint(), ed.getDirectionVector(), dp, counterSteep);
if (ed.contains(pt)) {
return pt;
}
}
}
}
return null;
}