pointIsInside method Null safety

  1. @visibleForTesting
bool pointIsInside(
  1. Vector3 point,
  2. Quad quad
)

Returns true iff the point is inside the rectangle given by the Quad, inclusively. Algorithm from https://math.stackexchange.com/a/190373.

Implementation

@visibleForTesting
static bool pointIsInside(Vector3 point, Quad quad) {
  final Vector3 aM = point - quad.point0;
  final Vector3 aB = quad.point1 - quad.point0;
  final Vector3 aD = quad.point3 - quad.point0;

  final double aMAB = aM.dot(aB);
  final double aBAB = aB.dot(aB);
  final double aMAD = aM.dot(aD);
  final double aDAD = aD.dot(aD);

  return 0 <= aMAB && aMAB <= aBAB && 0 <= aMAD && aMAD <= aDAD;
}