hitTest method

@override bool hitTest(Offset point)

Implementation

@override
bool hitTest(Offset point) {
  if (startPoint == null) return false;
  const tolerance = 5.0;
  return (point.dy - startPoint!.dy).abs() <= tolerance &&
      ((direction! > 0 && point.dx >= startPoint!.dx) ||
          (direction! < 0 && point.dx <= startPoint!.dx));
}