protected override void BuildMeshComponents()
{
Vertices = new Vector3[4];
Vector2 center = MeshHelper.GetCenter(Verts);
for (int i = 0; i < 4; i++)
{
Vertices[i] = Verts[i] - center;
}
double[] angles = new double[4];
double sum = 0;
for (int i = 0; i < 4; i++)
{
angles[i] = MeshHelper.AngleBetweenPoints(Verts[i], Verts[(i + 1) % 4], Verts[(i + 2) % 4]);
sum += angles[i];
}
if (System.Math.Abs(360 - sum) < 1e-3) //check for clockwise order
{
Triangles = new int [] { 0, 1, 3, 2, 3, 1 };
}
else
{
int index = GetMaxIndex(angles);
int a = (index + 1) % 4;
int b = (index + 2) % 4;
int c = (index + 3) % 4;
Triangles = new int[] { a, index, c, b, a, c };
}
UVs = MeshHelper.UVUnwrap(Vertices);
}
public static bool IsShapeClockWise(List<Vector2> sourcePoints)
{
Debug.Assert(sourcePoints.Count>=3, "Triangulation::IsShapeClockwise: points count must be greater than two!");
double sum = 0;
for (int i = 0; i < sourcePoints.Count; i++)
{
int k1 = i + 1;
if (k1 >= sourcePoints.Count) k1 -= sourcePoints.Count;
int k2 = i + 2;
if (k2 >= sourcePoints.Count) k2 -= sourcePoints.Count;
if (AreVecsConvex(sourcePoints[i], sourcePoints[k1], sourcePoints[k2]))
{
sum += MeshHelper.AngleBetweenPoints(sourcePoints[i], sourcePoints[k1], sourcePoints[k2]);
}
else
{
sum += 360 - MeshHelper.AngleBetweenPoints(sourcePoints[i], sourcePoints[k1], sourcePoints[k2]);
}
}
return System.Math.Round(sum) == 180 * (sourcePoints.Count - 2);
}
