/// <summary>
/// Add a contour to the polygon.
/// </summary>
/// <param name="contour">The contour to insert.</param>
/// <param name="hole">Treat contour as a hole.</param>
public void Add(Contour contour, bool hole = false)
{
if (hole)
{
this.Add(contour, contour.FindInteriorPoint());
}
else
{
this.points.AddRange(contour.Points);
this.segments.AddRange(contour.GetSegments());
}
}
/// <summary>
/// Add a contour to the polygon.
/// </summary>
/// <param name="contour">The contour to insert.</param>
/// <param name="hole">Point inside the contour, making it a hole.</param>
public void Add(Contour contour, Point hole)
{
this.points.AddRange(contour.Points);
this.segments.AddRange(contour.GetSegments());
this.holes.Add(hole);
}
private static Mesh GetTriangleDotNetMesh(List <Vector2[]> poly_vertices)
{
var num_vxs = 0;
foreach (var ring_vxs in poly_vertices)
{
num_vxs += ring_vxs.Length + 1;
}
var poly = new TriangleNet.Geometry.Polygon(num_vxs);
// set vertices
var ri = 0;
foreach (var ring_vxs in poly_vertices)
{
var vxs_input = new List <TriangleNet.Geometry.Vertex>(ring_vxs.Length + 1);
foreach (var vx in ring_vxs)
{
vxs_input.Add(new TriangleNet.Geometry.Vertex(vx.x, vx.y));
}
// add to poly
bool is_hole = ri != 0;
var contour = new TriangleNet.Geometry.Contour(vxs_input);
poly.Add(contour, is_hole);
++ri;
}
// triangulate
var opts = new TriangleNet.Meshing.ConstraintOptions()
{
ConformingDelaunay = true
};
var tn_mesh = (TriangleNet.Mesh)poly.Triangulate(opts);
// write
var tri_vxs = new Vector3[tn_mesh.Triangles.Count * 3];
var tri_ids = new int[tn_mesh.Triangles.Count * 3];
int i = 0;
foreach (var tri in tn_mesh.Triangles)
{
tri_vxs[i + 0] = new Vector3((float)tri.GetVertex(0).x, (float)tri.GetVertex(0).y, 0);
tri_vxs[i + 1] = new Vector3((float)tri.GetVertex(2).x, (float)tri.GetVertex(2).y, 0);
tri_vxs[i + 2] = new Vector3((float)tri.GetVertex(1).x, (float)tri.GetVertex(1).y, 0);
tri_ids[i + 0] = i + 0;
tri_ids[i + 1] = i + 1;
tri_ids[i + 2] = i + 2;
i += 3;
}
// create mesh
var m = new Mesh();
// assign to mesh
m.vertices = tri_vxs;
m.triangles = tri_ids;
// recompute geometry
// QUESTION why do we need bounds?
m.RecalculateNormals();
m.RecalculateBounds();
return(m);
}
