/**
* creates a new triangle facet within the hole incident to h by connecting the tip of h with two
* new halfedges and a new vertex. Returns the halfedge of the new edge that is incident to the
* new facet and the new vertex.
*/
public Halfedge<X> addTriangleToBorder(Halfedge h, X point) {
if (h.face != null) throw new Error("no border edge");
System.out.println("adding triangle to " + h);
Face<X> newFace = new Face<X>();
Vertex<X> newVertex = new Vertex<X>(point);
Halfedge<X> hPrev = new Halfedge<X>();
Halfedge<X> hNext = new Halfedge<X>();
Halfedge<X> hPrevOpp = new Halfedge<X>();
Halfedge<X> hNextOpp = new Halfedge<X>();
// setting the new face
newFace.setEdge(h);
// setting hPrev (halfedge preceding h in the new face)
hPrev.setFace(newFace);
hPrev.setVertex(h.getOpposite().getVertex());
hPrev.setPrev(hNext);
hPrev.setNext(h);
hPrev.setOpposite(hPrevOpp);
// setting hNext (halfedge following h in the new face)
hNext.setFace(newFace);
hNext.setVertex(newVertex);
hNext.setPrev(h);
hNext.setNext(hPrev);
hNext.setOpposite(hNextOpp);
// setting hPrevOpp (new boundary halfedge)
hPrevOpp.setFace(null);
hPrevOpp.setVertex(newVertex);
hPrevOpp.setPrev(h.getPrev());
hPrevOpp.setNext(hNextOpp);
hPrevOpp.setOpposite(hPrev);
// setting hNextOpp (the other new boundary halfedge)
hNextOpp.setFace(null);
hNextOpp.setVertex(h.getVertex());
hNextOpp.setPrev(hPrevOpp);
hNextOpp.setNext(h.getNext());
hNextOpp.setOpposite(hNext);
// updating old boundary halfedge informations
h.setFace(newFace);
h.setPrev(hPrev);
h.setNext(hNext);
// setting newVertex
newVertex.setEdge(hPrev); // LCA: a controler si c'est hPrev ou hNext
// adding new facet, vertex and the four halfedges
this.vertices.add(newVertex);
this.facets.add(newFace);
this.halfedges.add(hPrev);
this.halfedges.add(hNext);
this.halfedges.add(hPrevOpp);
this.halfedges.add(hNextOpp);
return hNext;
}
/**
* returns true if the polyhedral surface is combinatorially consistent. If borders==true
* normalization of the border edges is checked too. This method checks that each facet is at
* least a triangle and that the two incident facets of a non-border edge are distinct.
*/
public boolean isValid(boolean borders) {
boolean valid = true;
System.out.print("Checking Polyhedron...");
int n = this.vertices.size();
int e = this.halfedges.size();
int f = this.facets.size();
for (int i = 0; i < this.halfedges.size(); i++) {
Halfedge<X> pedge = this.halfedges.get(i);
if (pedge.getOpposite() == null) {
System.out.print("error opposite: " + i);
valid = false;
// Face face=pedge.getFace();
// int[] ind=face.getVertexIndices(this);
// System.out.println(" "+ind[0]+" "+ind[1]+" "+ind[2]);
}
if (pedge.getNext() == null) {
System.out.println("error next_edge: " + i);
valid = false;
}
if (pedge.getPrev() == null) {
System.out.println("error prev_edge: " + i);
valid = false;
}
if (pedge.getVertex() == null) {
System.out.println("error vertex: " + i);
valid = false;
}
if (pedge.opposite != null && pedge.face == pedge.getOpposite().face) {
System.out.println("error edge: " + i);
valid = false;
}
}
for (int i = 0; i < this.facets.size(); i++) {
Face<X> pface = this.facets.get(i);
if (pface == null) {
System.out.println("error face pointer");
valid = false;
}
if (pface.halfedge == null) {
System.out.println("error face.halfedge");
valid = false;
}
if (pface.degree() < 3) {
System.out.println("error face degree");
return valid = false;
}
}
for (int i = 0; i < this.vertices.size(); i++) {
Vertex<X> pvertex = this.vertices.get(i);
// System.out.println(""+pvertex.toString());
if (pvertex == null) {
System.out.println("error vertex pointer:" + i);
valid = false;
}
if (pvertex.halfedge == null) {
System.out.println("error vertex.halfedge: " + i);
valid = false;
}
if (pvertex.getPoint() == null) {
System.out.println("error vertex.point: " + i);
valid = false;
}
}
if (valid == true) System.out.println("ok");
else System.out.println("not valid");
System.out.print("n: " + n + " e: " + e / 2 + " f: " + f + " - ");
int g = -(n - e / 2 + f - 2) / 2;
System.out.println("genus: " + g);
return valid;
}