private void drawPolygonOutline(
DrawContext dc,
List<LatLon> locations,
List<Boolean> edgeFlags,
double[] altitudes,
boolean[] terrainConformant,
boolean enableCaps,
int subdivisions,
Vec4 referenceCenter) {
PolygonGeometry geom =
this.getPolygonGeometry(
dc,
locations,
edgeFlags,
altitudes,
terrainConformant,
enableCaps,
subdivisions,
referenceCenter);
if (geom != null)
this.getRenderer().drawGeometry(dc, geom.getOutlineIndexGeometry(), geom.getVertexGeometry());
}
private void makePolygon(
DrawContext dc,
List<LatLon> locations,
List<Boolean> edgeFlags,
double[] altitudes,
boolean[] terrainConformant,
boolean enableCaps,
int subdivisions,
Vec4 referenceCenter,
PolygonGeometry dest) {
if (locations.size() == 0) return;
GeometryBuilder gb = this.getGeometryBuilder();
Vec4[] polyPoints = new Vec4[locations.size() + 1];
Boolean[] polyEdgeFlags = new Boolean[locations.size() + 1];
Matrix[] polyTransform = new Matrix[1];
int polyCount =
this.computeCartesianPolygon(
dc.getGlobe(), locations, edgeFlags, polyPoints, polyEdgeFlags, polyTransform);
// Compute the winding order of the planar cartesian points. If the order is not
// counter-clockwise, then
// reverse the locations and points ordering.
int winding = gb.computePolygonWindingOrder2(0, polyCount, polyPoints);
if (winding != GeometryBuilder.COUNTER_CLOCKWISE) {
gb.reversePoints(0, polyCount, polyPoints);
gb.reversePoints(0, polyCount, polyEdgeFlags);
}
float[] polyVertices = new float[3 * polyCount];
this.makePolygonVertices(polyCount, polyPoints, polyVertices);
int fillDrawMode = GL.GL_TRIANGLES;
int outlineDrawMode = GL.GL_LINES;
int fillIndexCount = 0;
int outlineIndexCount = 0;
int vertexCount = 0;
GeometryBuilder.IndexedTriangleArray ita = null;
fillIndexCount += this.getEdgeFillIndexCount(polyCount, subdivisions);
outlineIndexCount += this.getEdgeOutlineIndexCount(polyCount, subdivisions, polyEdgeFlags);
vertexCount += this.getEdgeVertexCount(polyCount, subdivisions);
if (enableCaps) {
ita = gb.tessellatePolygon2(0, polyCount, polyVertices);
for (int i = 0; i < subdivisions; i++) {
gb.subdivideIndexedTriangleArray(ita);
}
fillIndexCount += ita.getIndexCount();
vertexCount += ita.getVertexCount();
// Bottom cap isn't drawn if airspace is collapsed.
if (!this.isAirspaceCollapsed()) {
fillIndexCount += ita.getIndexCount();
vertexCount += ita.getVertexCount();
}
}
int[] fillIndices = new int[fillIndexCount];
int[] outlineIndices = new int[outlineIndexCount];
float[] vertices = new float[3 * vertexCount];
float[] normals = new float[3 * vertexCount];
int fillIndexPos = 0;
int outlineIndexPos = 0;
int vertexPos = 0;
this.makeEdge(
dc,
polyCount,
polyVertices,
polyEdgeFlags,
altitudes,
terrainConformant,
subdivisions,
GeometryBuilder.OUTSIDE,
polyTransform[0],
referenceCenter,
fillIndexPos,
fillIndices,
outlineIndexPos,
outlineIndices,
vertexPos,
vertices,
normals);
fillIndexPos += this.getEdgeFillIndexCount(polyCount, subdivisions);
outlineIndexPos += this.getEdgeOutlineIndexCount(polyCount, subdivisions, polyEdgeFlags);
vertexPos += this.getEdgeVertexCount(polyCount, subdivisions);
if (enableCaps) {
this.makeCap(
dc,
ita,
altitudes[1],
terrainConformant[1],
GeometryBuilder.OUTSIDE,
polyTransform[0],
referenceCenter,
fillIndexPos,
fillIndices,
vertexPos,
vertices,
normals);
fillIndexPos += ita.getIndexCount();
vertexPos += ita.getVertexCount();
// Bottom cap isn't drawn if airspace is collapsed.
if (!this.isAirspaceCollapsed()) {
this.makeCap(
dc,
ita,
altitudes[0],
terrainConformant[0],
GeometryBuilder.INSIDE,
polyTransform[0],
referenceCenter,
fillIndexPos,
fillIndices,
vertexPos,
vertices,
normals);
fillIndexPos += ita.getIndexCount();
vertexPos += ita.getVertexCount();
}
}
dest.getFillIndexGeometry().setElementData(fillDrawMode, fillIndexCount, fillIndices);
dest.getOutlineIndexGeometry()
.setElementData(outlineDrawMode, outlineIndexCount, outlineIndices);
dest.getVertexGeometry().setVertexData(vertexCount, vertices);
dest.getVertexGeometry().setNormalData(vertexCount, normals);
}
private PolygonGeometry getPolygonGeometry(
DrawContext dc,
List<LatLon> locations,
List<Boolean> edgeFlags,
double[] altitudes,
boolean[] terrainConformant,
boolean enableCaps,
int subdivisions,
Vec4 referenceCenter) {
Object cacheKey =
new Geometry.CacheKey(
dc.getGlobe(),
this.getClass(),
"Polygon",
locations,
edgeFlags,
altitudes[0],
altitudes[1],
terrainConformant[0],
terrainConformant[1],
enableCaps,
subdivisions,
referenceCenter);
// Wrap geometry creation in a try/catch block. We do this to catch and handle OutOfMemoryErrors
// caused during
// tessellation of the polygon vertices. If the polygon cannot be tessellated, we replace the
// polygon's
// locations with an empty list to prevent subsequent tessellation attempts, and to avoid
// rendering a misleading
// representation by omitting any part of the geometry.
try {
PolygonGeometry geom = (PolygonGeometry) this.getGeometryCache().getObject(cacheKey);
if (geom == null || this.isExpired(dc, geom.getVertexGeometry())) {
if (geom == null) geom = new PolygonGeometry();
this.makePolygon(
dc,
locations,
edgeFlags,
altitudes,
terrainConformant,
enableCaps,
subdivisions,
referenceCenter,
geom);
this.updateExpiryCriteria(dc, geom.getVertexGeometry());
this.getGeometryCache().add(cacheKey, geom);
}
return geom;
} catch (OutOfMemoryError e) {
String message = Logging.getMessage("generic.ExceptionWhileTessellating", this);
Logging.logger().log(java.util.logging.Level.SEVERE, message, e);
//noinspection ThrowableInstanceNeverThrown
dc.addRenderingException(new WWRuntimeException(message, e));
this.handleUnsuccessfulGeometryCreation();
return null;
}
}