private void Draw(BitmapBuffer writeableBmp, Branch branch)
{
int[] pts = new int[]
{
branch.Start.X, branch.Start.Y,
branch.Middle.X, branch.Middle.Y,
branch.End.X, branch.End.Y,
};
// Draw with cardinal spline
writeableBmp.DrawCurve(pts, Tension, this.Color);
foreach (var b in branch.Branches)
{
Draw(writeableBmp, b);
}
}