private void findRightmostEdgeAtVertex() {
/**
* The rightmost point is an interior vertex, so it has a segment on either side of it. If these
* segments are both above or below the rightmost point, we need to determine their relative
* orientation to decide which is rightmost.
*/
Coordinate[] pts = minDe.getEdge().getCoordinates();
Assert.isTrue(
minIndex > 0 && minIndex < pts.length,
"rightmost point expected to be interior vertex of edge");
Coordinate pPrev = pts[minIndex - 1];
Coordinate pNext = pts[minIndex + 1];
int orientation = CGAlgorithms.computeOrientation(minCoord, pNext, pPrev);
boolean usePrev = false;
// both segments are below min point
if (pPrev.y < minCoord.y
&& pNext.y < minCoord.y
&& orientation == CGAlgorithms.COUNTERCLOCKWISE) {
usePrev = true;
} else if (pPrev.y > minCoord.y
&& pNext.y > minCoord.y
&& orientation == CGAlgorithms.CLOCKWISE) {
usePrev = true;
}
// if both segments are on the same side, do nothing - either is safe
// to select as a rightmost segment
if (usePrev) {
minIndex = minIndex - 1;
}
}
private void addBufferCoordinates() {
if (m_segment0 == null || m_segment1 == null || m_buffer0 == null || m_buffer1 == null) return;
final int orientation =
CGAlgorithms.computeOrientation(m_segment0.p0, m_segment0.p1, m_segment1.p1);
final boolean outsideTurn =
(orientation == CGAlgorithms.CLOCKWISE && m_side == Position.LEFT)
|| (orientation == CGAlgorithms.COUNTERCLOCKWISE && m_side == Position.RIGHT);
// REMARK: we add only points at the current buffer vertex (i.e. the common point of the two
// segments);
// the very first and very last vertex must be added separately
// last crd of last segment is added separately
final boolean addStartPoint = true;
if (orientation == 0) {
addCollinear(addStartPoint);
} else if (outsideTurn) {
addOutsideTurn(orientation, addStartPoint);
} else {
addInsideTurn();
}
}
