// 三角形から作成
public static Centroid Create(Vector3d p0, Vector3d p1, Vector3d p2)
{
Centroid ret = default(Centroid);
ret.set(p0, p1, p2);
return(ret);
}
public override Centroid GetCentroid()
{
Centroid cent = default;
Centroid ct = default;
for (int i = 0; i < mHeModel.FaceStore.Count; i++)
{
HeFace f = mHeModel.FaceStore[i];
HalfEdge head = f.Head;
HalfEdge he = head;
int i0 = he.Vertex;
int i1 = he.Next.Vertex;
int i2 = he.Next.Next.Vertex;
ct.set(
mHeModel.VertexStore[i0].vector,
mHeModel.VertexStore[i1].vector,
mHeModel.VertexStore[i2].vector
);
cent = cent.Merge(ct);
}
return(cent);
}
public override Centroid GetCentroid()
{
Centroid ret = default;
ret.Point = mPointList[0].vector;
return(ret);
}
public override Centroid GetCentroid()
{
Centroid ret = default;
ret.IsInvalid = true;
return(ret);
}
public override Centroid GetCentroid()
{
Centroid ret = default;
Vector3d cp = StoreList[0].vector;
Vector3d rp = StoreList[1].vector;
Vector3d d = rp - cp;
double r = d.Norm();
ret.Point = cp;
ret.Area = r * r * Math.PI;
return(ret);
}
// 二つの重心情報から重心を求める
public static Centroid Merge(Centroid c0, Centroid c1)
{
Vector3d gpt = default;
double ratio = c1.Area / (c0.Area + c1.Area);
gpt.X = (c1.Point.X - c0.Point.X) * ratio + c0.Point.X;
gpt.Y = (c1.Point.Y - c0.Point.Y) * ratio + c0.Point.Y;
gpt.Z = (c1.Point.Z - c0.Point.Z) * ratio + c0.Point.Z;
Centroid ret = default(Centroid);
ret.Area = c0.Area + c1.Area;
ret.Point = gpt;
return(ret);
}
// 三角形群の重心を求める
public static Centroid TriangleListCentroid(List <CadFigure> triangles)
{
Centroid c0 = default;
Centroid c1 = default;
Centroid ct = default;
int i = 1;
c0.Area = TriangleArea(triangles[0]);
c0.Point = TriangleCentroid(triangles[0]);
for (; i < triangles.Count; i++)
{
c1.Area = TriangleArea(triangles[i]);
c1.Point = TriangleCentroid(triangles[i]);
ct = c0.Merge(c1);
c0 = ct;
}
return(c0);
}
// 二つの重心情報から重心を求める
public Centroid Merge(Centroid c1)
{
return(Merge(this, c1));
}
