Affine.MapTri C# (CSharp) Method

	public bool MapTri(float px0, float py0, float qx0, float qy0, float rx0, float ry0)
	{
		// px0 = dx, qx0 = m11 + dx, rx0 = m21 + dx
		// py0 = dy, qy0 = m12 + dy, ry0 = m22 + dy
		fMatrix.eM11 = qx0 - px0;
		fMatrix.eM12 = qy0 - py0;
		fMatrix.eM21 = rx0 - px0;
		fMatrix.eM22 = ry0 - py0;
		fMatrix.eDx = px0;
		fMatrix.eDy = py0;

		return fMatrix.eM11 * fMatrix.eM22 != fMatrix.eM12 * fMatrix.eM21;
	}

	// Find a transform which maps p0, q0, and r0 to p1, p1 and r1 respectively
	public bool MapTri(float px0, float py0, float qx0, float qy0, float rx0, float ry0,
						 float px1, float py1, float qx1, float qy1, float rx1, float ry1)
	{
		if (!MapTri(px0, py0, qx0, qy0, rx0, ry0))
			return false;

		Invert();		// transform p0, q0, and r0 back to (0,0),(1,0),(0,1)

		Affine map1 = new Affine();

		if (!map1.MapTri(px1, py1, qx1, qy1, rx1, ry1))
			return false;

		return Combine(map1.fMatrix);	// then to p1,r1,q1
	}