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++;
}
}
/**
* Construct a unit-length cube centered at a specified point.
*
* @param point the center of the cube.
* @throws IllegalArgumentException if the point is null.
*/
public Box(Vec4 point) {
if (point == null) {
String msg = Logging.getMessage("nullValue.PointIsNull");
Logging.error(msg);
throw new IllegalArgumentException(msg);
}
this.ru = new Vec4(1, 0, 0, 1);
this.su = new Vec4(0, 1, 0, 1);
this.tu = new Vec4(0, 0, 1, 1);
this.r = this.ru;
this.s = this.su;
this.t = this.tu;
this.rLength = 1;
this.sLength = 1;
this.tLength = 1;
// Plane normals point outwards from the box.
this.planes = new Plane[6];
double d = 0.5 * point.getLength3();
this.planes[0] = new Plane(-this.ru.x, -this.ru.y, -this.ru.z, -(d + 0.5));
this.planes[1] = new Plane(+this.ru.x, +this.ru.y, +this.ru.z, -(d + 0.5));
this.planes[2] = new Plane(-this.su.x, -this.su.y, -this.su.z, -(d + 0.5));
this.planes[3] = new Plane(+this.su.x, +this.su.y, +this.su.z, -(d + 0.5));
this.planes[4] = new Plane(-this.tu.x, -this.tu.y, -this.tu.z, -(d + 0.5));
this.planes[5] = new Plane(+this.tu.x, +this.tu.y, +this.tu.z, -(d + 0.5));
this.center = ru.add3(su).add3(tu).multiply3(0.5);
Vec4 rHalf = r.multiply3(0.5);
this.topCenter = this.center.add3(rHalf);
this.bottomCenter = this.center.subtract3(rHalf);
}