public Matrix2x2 Inverse()
{
var s = 1f / (X1 * Y2 - X2 * Y1);
var m = new Matrix2x2(Y2, -Y1, -X2, X1);
return(s * m);
}
private Matrix2x2 GetBarryCentricInverseMatrix()
{
var AB = _b.ScreenPosition - _a.ScreenPosition;
var AC = _c.ScreenPosition - _a.ScreenPosition;
var A = new Matrix2x2(AB.X, AB.Y, AC.X, AC.Y);
return(A.Inverse());
}
private void OnPropertyChanged()
{
_isBackfacingOnScreen = IsBackfacingOnScreen();
_barryCentricMatrixInverse = GetBarryCentricInverseMatrix();
}