@Override
protected List<Vec4> computeMinimalGeometry(Globe globe, double verticalExaggeration) {
double[] angles = this.computeAngles();
// Angles are equal, fall back to building a closed cylinder.
if (angles == null) return super.computeMinimalGeometry(globe, verticalExaggeration);
double[] radii = this.getRadii();
Matrix transform = this.computeTransform(globe, verticalExaggeration);
GeometryBuilder gb = this.getGeometryBuilder();
int count = gb.getPartialDiskVertexCount(MINIMAL_GEOMETRY_SLICES, MINIMAL_GEOMETRY_LOOPS);
int numCoords = 3 * count;
float[] verts = new float[numCoords];
gb.makePartialDiskVertices(
(float) radii[0],
(float) radii[1], // Inner radius, outer radius.
MINIMAL_GEOMETRY_SLICES,
MINIMAL_GEOMETRY_LOOPS, // Slices, loops,
(float) angles[0],
(float) angles[2], // Start angle, sweep angle.
verts);
List<LatLon> locations = new ArrayList<LatLon>();
for (int i = 0; i < numCoords; i += 3) {
Vec4 v = new Vec4(verts[i], verts[i + 1], verts[i + 2]);
v = v.transformBy4(transform);
locations.add(globe.computePositionFromPoint(v));
}
ArrayList<Vec4> points = new ArrayList<Vec4>();
this.makeExtremePoints(globe, verticalExaggeration, locations, points);
return points;
}
private void makePartialDisk(
DrawContext dc,
double[] radii,
double altitude,
boolean terrainConformant,
int slices,
int loops,
int orientation,
double start,
double sweep,
Vec4 referenceCenter,
Geometry dest) {
GeometryBuilder gb = this.getGeometryBuilder();
gb.setOrientation(orientation);
int count = gb.getPartialDiskIndexCount(slices, loops);
int numCoords = 3 * count;
float[] verts = new float[numCoords];
float[] norms = new float[numCoords];
gb.makePartialDiskVertices(
(float) radii[0], (float) radii[1], slices, loops, (float) start, (float) sweep, verts);
this.makePartialDiskTerrainConformant(
dc, numCoords, verts, altitude, terrainConformant, referenceCenter);
gb.makePartialDiskVertexNormals(
(float) radii[0],
(float) radii[1],
slices,
loops,
(float) start,
(float) sweep,
verts,
norms);
dest.setVertexData(count, verts);
dest.setNormalData(count, norms);
}