protected virtual void updateMatrixes()
{
if (!_areMatrixesDirty)
{
return;
}
Matrix2D tempMat;
_transformMatrix = Matrix2D.CreateTranslation(-entity.transform.position.X, -entity.transform.position.Y, 0f); // position
if (_zoom != 1f)
{
Matrix2D.CreateScale(_zoom, _zoom, out tempMat); // scale ->
Matrix2D.Multiply(ref _transformMatrix, ref tempMat, out _transformMatrix);
}
if (entity.transform.rotation != 0f)
{
Matrix2D.CreateRotationZ(entity.transform.rotation, out tempMat); // rotation
Matrix2D.Multiply(ref _transformMatrix, ref tempMat, out _transformMatrix);
}
Matrix2D.CreateTranslation((int)_origin.X, (int)_origin.Y, out tempMat); // translate -origin
Matrix2D.Multiply(ref _transformMatrix, ref tempMat, out _transformMatrix);
// calculate our inverse as well
Matrix2D.Invert(ref _transformMatrix, out _inverseTransformMatrix);
// whenever the matrix changes the bounds are then invalid
_areBoundsDirty = true;
_areMatrixesDirty = false;
}