/**
* Add a vertex to the polygon's outer boundary.
*
* @param mousePoint the point at which the mouse was clicked. The new vertex will be placed as
* near as possible to this point, at the elevation of the polygon.
*/
protected void addVertex(Point mousePoint) {
// Try to find the edge that is closest to a ray passing through the screen point. We're trying
// to determine
// the user's intent as to which edge a new two control points should be added to.
Line ray = this.wwd.getView().computeRayFromScreenPoint(mousePoint.getX(), mousePoint.getY());
Vec4 pickPoint = this.intersectPolygonAltitudeAt(ray);
double nearestDistance = Double.MAX_VALUE;
int newVertexIndex = 0;
// Loop through the control points and determine which edge is closest to the pick point
for (int i = 0; i < this.controlPoints.size(); i++) {
ControlPointMarker thisMarker = (ControlPointMarker) this.controlPoints.get(i);
ControlPointMarker nextMarker =
(ControlPointMarker) this.controlPoints.get((i + 1) % this.controlPoints.size());
Vec4 pointOnEdge =
AirspaceEditorUtil.nearestPointOnSegment(thisMarker.point, nextMarker.point, pickPoint);
if (!AirspaceEditorUtil.isPointBehindLineOrigin(ray, pointOnEdge)) {
double d = pointOnEdge.distanceTo3(pickPoint);
if (d < nearestDistance) {
newVertexIndex = i + 1;
nearestDistance = d;
}
}
}
Position newPosition = this.wwd.getModel().getGlobe().computePositionFromPoint(pickPoint);
// Copy the outer boundary list
ArrayList<Position> positionList = new ArrayList<Position>(this.controlPoints.size());
for (LatLon position : this.getPolygon().getOuterBoundary()) {
positionList.add((Position) position);
}
// Add the new vertex
positionList.add(newVertexIndex, newPosition);
this.getPolygon().setOuterBoundary(positionList);
}
