begin property
The beginning alignment calculated from the angle.
Implementation
@override
/// The beginning alignment calculated from the angle.
AlignmentGeometry get begin {
final x = 0.5 + 0.5 * cos(angle);
final y = 0.5 + 0.5 * sin(angle);
return AlignmentDirectional(x * 2 - 1, y * 2 - 1);
}