protected void setPolygonHeight(Point previousMousePoint, Point mousePoint) {
// Find the closest points between the rays through each screen point, and the ray from the
// control point
// and in the direction of the globe's surface normal. Compute the elevation difference between
// these two
// points, and use that as the change in polygon height.
Position referencePos = this.polygon.getReferencePosition();
if (referencePos == null) return;
Vec4 referencePoint = this.wwd.getModel().getGlobe().computePointFromPosition(referencePos);
Vec4 surfaceNormal =
this.wwd
.getModel()
.getGlobe()
.computeSurfaceNormalAtLocation(
referencePos.getLatitude(), referencePos.getLongitude());
Line verticalRay = new Line(referencePoint, surfaceNormal);
Line screenRay =
this.wwd.getView().computeRayFromScreenPoint(mousePoint.getX(), mousePoint.getY());
Line previousScreenRay =
this.wwd
.getView()
.computeRayFromScreenPoint(previousMousePoint.getX(), previousMousePoint.getY());
Vec4 pointOnLine = AirspaceEditorUtil.nearestPointOnLine(verticalRay, screenRay);
Vec4 previousPointOnLine =
AirspaceEditorUtil.nearestPointOnLine(verticalRay, previousScreenRay);
Position pos = this.wwd.getModel().getGlobe().computePositionFromPoint(pointOnLine);
Position previousPos =
this.wwd.getModel().getGlobe().computePositionFromPoint(previousPointOnLine);
double elevationChange = pos.getElevation() - previousPos.getElevation();
java.util.List<Position> boundary = new ArrayList<Position>();
for (LatLon ll : this.polygon.getOuterBoundary()) {
boundary.add(new Position(ll, ((Position) ll).getElevation() + elevationChange));
}
this.polygon.setOuterBoundary(boundary);
}
