hitTestInput method
Evaluates this display object to see if the coordinates localX
and
localY
are inside this display object.
If the coordinates are inside, this display object is returned; null otherwise.
localX
and localY
are relative to to the origin (0,0) of this
display object (local coordinates).
Implementation
@override
DisplayObject? hitTestInput(num localX, num localY) {
if (hitTestState == null) return null;
final matrix = hitTestState!.transformationMatrix;
final deltaX = localX - matrix.tx;
final deltaY = localY - matrix.ty;
final childX = (matrix.d * deltaX - matrix.c * deltaY) / matrix.det;
final childY = (matrix.a * deltaY - matrix.b * deltaX) / matrix.det;
return hitTestState!.hitTestInput(childX, childY) != null ? this : null;
}