protected void assembleHeightControlPoints() {
if (this.controlPoints.size() < 2) return;
// Add one control point for the height between the first and second vertices.
// TODO: ensure that this control point is visible
Position firstVertex = this.controlPoints.get(0).getPosition();
Position secondVertex = this.controlPoints.get(1).getPosition();
Globe globe = this.wwd.getModel().getGlobe();
// Get cartesian points for the vertices
Vec4 firstPoint = globe.computePointFromPosition(firstVertex);
Vec4 secondPoint = globe.computePointFromPosition(secondVertex);
// Find the midpoint of the line segment that connects the vertices
Vec4 halfwayPoint = firstPoint.add3(secondPoint).divide3(2.0);
Position halfwayPosition = globe.computePositionFromPoint(halfwayPoint);
this.controlPoints.add(
new ControlPointMarker(
CHANGE_HEIGHT_ACTION,
halfwayPosition,
halfwayPoint,
this.heightControlAttributes,
this.controlPoints.size()));
}
protected void assembleVertexControlPoints(DrawContext dc) {
Terrain terrain = dc.getTerrain();
ExtrudedPolygon polygon = this.getPolygon();
Position refPos = polygon.getReferencePosition();
Vec4 refPoint = terrain.getSurfacePoint(refPos.getLatitude(), refPos.getLongitude(), 0);
int altitudeMode = polygon.getAltitudeMode();
double height = polygon.getHeight();
Vec4 vaa = null;
double vaaLength = 0; // used to compute independent length of each cap vertex
double vaLength = 0;
int i = 0;
for (LatLon location : polygon.getOuterBoundary()) {
Vec4 vert;
// Compute the top/cap point.
if (altitudeMode == WorldWind.CONSTANT || !(location instanceof Position)) {
if (vaa == null) {
// Compute the vector lengths of the top and bottom points at the reference position.
vaa = refPoint.multiply3(height / refPoint.getLength3());
vaaLength = vaa.getLength3();
vaLength = refPoint.getLength3();
}
// Compute the bottom point, which is on the terrain.
vert = terrain.getSurfacePoint(location.getLatitude(), location.getLongitude(), 0);
double delta = vaLength - vert.dot3(refPoint) / vaLength;
vert = vert.add3(vaa.multiply3(1d + delta / vaaLength));
} else if (altitudeMode == WorldWind.RELATIVE_TO_GROUND) {
vert =
terrain.getSurfacePoint(
location.getLatitude(),
location.getLongitude(),
((Position) location).getAltitude());
} else // WorldWind.ABSOLUTE
{
vert =
terrain
.getGlobe()
.computePointFromPosition(
location.getLatitude(),
location.getLongitude(),
((Position) location).getAltitude() * terrain.getVerticalExaggeration());
}
Position vertexPosition = this.wwd.getModel().getGlobe().computePositionFromPoint(vert);
this.controlPoints.add(
new ControlPointMarker(
MOVE_VERTEX_ACTION, vertexPosition, vert, this.vertexControlAttributes, i));
i++;
}
}
