protected void doMoveAirspaceVertically(
WorldWindow wwd, Airspace airspace, Point mousePoint, Point previousMousePoint) {
// 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 airspace altitude.
//
// If the state keepControlPointsAboveTerrain is set, we prevent the control point from passing
// any lower than
// the terrain elevation beneath it.
if (!(airspace instanceof Movable)) {
return;
}
Movable movable = (Movable) airspace;
Position referencePos = movable.getReferencePosition();
if (referencePos == null) return;
Vec4 referencePoint = wwd.getModel().getGlobe().computePointFromPosition(referencePos);
Vec4 surfaceNormal =
wwd.getModel()
.getGlobe()
.computeSurfaceNormalAtLocation(
referencePos.getLatitude(), referencePos.getLongitude());
Line verticalRay = new Line(referencePoint, surfaceNormal);
Line screenRay =
wwd.getView()
.computeRayFromScreenPoint(previousMousePoint.getX(), previousMousePoint.getY());
Line previousScreenRay =
wwd.getView().computeRayFromScreenPoint(mousePoint.getX(), mousePoint.getY());
Vec4 pointOnLine = AirspaceEditorUtil.nearestPointOnLine(verticalRay, screenRay);
Vec4 previousPointOnLine =
AirspaceEditorUtil.nearestPointOnLine(verticalRay, previousScreenRay);
Position pos = wwd.getModel().getGlobe().computePositionFromPoint(pointOnLine);
Position previousPos = wwd.getModel().getGlobe().computePositionFromPoint(previousPointOnLine);
double elevationChange = previousPos.getElevation() - pos.getElevation();
double[] altitudes = this.getAirspace().getAltitudes();
boolean[] terrainConformance = this.getAirspace().isTerrainConforming();
if (this.isKeepControlPointsAboveTerrain()) {
if (terrainConformance[LOWER_ALTITUDE]) {
if (altitudes[LOWER_ALTITUDE] + elevationChange < 0.0)
elevationChange = 0.0 - altitudes[LOWER_ALTITUDE];
} else {
double height =
AirspaceEditorUtil.computeLowestHeightAboveSurface(
wwd, this.getCurrentControlPoints(), LOWER_ALTITUDE);
if (elevationChange <= -height) {
elevationChange = -height;
}
}
}
altitudes[LOWER_ALTITUDE] += elevationChange;
altitudes[UPPER_ALTITUDE] += elevationChange;
this.getAirspace().setAltitudes(altitudes[LOWER_ALTITUDE], altitudes[UPPER_ALTITUDE]);
this.fireAirspaceMoved(new AirspaceEditEvent(wwd, airspace, this));
}
