public static VertexStore TransformToVxs(this Bilinear bilinearTx, VertexStore src, VertexStore vxs)
{
int count = src.Count;
VertexCmd cmd;
double x, y;
for (int i = 0; i < count; ++i)
{
cmd = src.GetVertex(i, out x, out y);
bilinearTx.Transform(ref x, ref y);
vxs.AddVertex(x, y, cmd);
}
return(vxs);
}