public override DisplayObject HitTest(Point localPoint)
{
if (!Visible || !Touchable || !HitTestMask(localPoint))
{
return(null);
}
for (int i = _children.Count - 1; i >= 0; --i)
{
// front to back!
DisplayObject child = _children[i];
if (child.IsMask)
{
continue;
}
Matrix2D transformationMatrix = Matrix2D.Create();
transformationMatrix.CopyFromMatrix(child.TransformationMatrix);
transformationMatrix.Invert();
Point transformedPoint = transformationMatrix.TransformPoint(localPoint);
DisplayObject target = child.HitTest(transformedPoint);
if (target != null)
{
return(TouchGroup ? this : target);
}
}
return(null);
}
/// <summary>
/// Checks if a certain point is inside the display object's mask. If there is no mask,
/// this method always returns <code>true</code> (because having no mask is equivalent
/// to having one that's infinitely big).
/// </summary>
public bool HitTestMask(Point localPoint)
{
if (_mask == null)
{
return(true);
}
if (_mask.Stage != null)
{
_sHelperMatrixAlt = GetTransformationMatrix(_mask);
}
else
{
_sHelperMatrixAlt.CopyFromMatrix(_mask.TransformationMatrix);
_sHelperMatrixAlt.Invert();
}
var helperPoint = _sHelperMatrixAlt.TransformPoint(localPoint);
return(_mask.HitTest(helperPoint) != null);
}