/**
* @param renderer GL renderer
* @param polygon polygon
* @param pt polygon triangulation
* @param vertices vertices of the polygon
* @param verticesLength vertices length (may <> vertices.length due to cache)
*/
public static final void drawPolygon(
Renderer renderer,
GeoPolygon polygon,
PolygonTriangulation pt,
Coords[] vertices,
int verticesLength) {
Coords n = polygon.getMainDirection();
pt.clear();
try {
// simplify the polygon and check if there are at least 3 points
// left
if (pt.updatePoints() > 2) {
// check if the polygon is convex
Convexity convexity = pt.checkIsConvex();
if (convexity != Convexity.NOT) {
boolean reverse =
polygon.getReverseNormalForDrawing() ^ (convexity == Convexity.CLOCKWISE);
renderer.getGeometryManager().drawPolygonConvex(n, vertices, verticesLength, reverse);
} else {
// set intersections (if needed) and divide the polygon into
// non self-intersecting polygons
pt.setIntersections();
// convert the set of polygons to triangle fans
pt.triangulate();
// compute 3D coords for intersections
Coords[] verticesWithIntersections =
pt.getCompleteVertices(vertices, polygon.getCoordSys(), verticesLength);
// draw the triangle fans
renderer
.getGeometryManager()
.drawTriangleFans(
n, verticesWithIntersections, pt.getMaxPointIndex(), pt.getTriangleFans());
}
}
} catch (Exception e) {
App.debug(e.getMessage());
e.printStackTrace();
}
}
/**
* Constructor for previewable
*
* @param a_view3D
* @param selectedPoints
*/
@SuppressWarnings("unchecked")
public DrawPolygon3D(EuclidianView3D a_view3D, ArrayList<GeoPointND> selectedPoints) {
super(a_view3D);
Kernel3D kernel = getView3D().getKernel();
setGeoElement(new GeoPolygon3D(kernel.getConstruction(), null));
getGeoElement().setIsPickable(false);
pt.setPolygon((GeoPolygon) getGeoElement());
this.selectedPoints = selectedPoints;
segments = new ArrayList<DrawSegment3D>();
segmentsPoints = new ArrayList<ArrayList>();
setPickingType(PickingType.SURFACE);
isPreview = true;
updatePreview();
}