/// <summary>Hit tests all segments within a contour generated with shape and path</summary>
/// <param name="shape"></param>
/// <param name="path"></param>
/// <returns>StrokeIntersection array for these segments</returns>
internal StrokeIntersection[] EraseTest(IEnumerable<Point> path, StylusShape shape)
{
System.Diagnostics.Debug.Assert(shape != null);
System.Diagnostics.Debug.Assert(path != null);
if (IEnumerablePointHelper.GetCount(path) == 0)
{
return new StrokeIntersection[0];
}
ErasingStroke erasingStroke = new ErasingStroke(shape, path);
List<StrokeIntersection> intersections = new List<StrokeIntersection>();
erasingStroke.EraseTest(StrokeNodeIterator.GetIterator(this, this.DrawingAttributes), intersections);
return intersections.ToArray();
}
/// <summary>
/// C-tor
/// </summary>
/// <param name="strokes">strokes to hit-test for erasing</param>
/// <param name="eraserShape">erasing shape</param>
internal IncrementalStrokeHitTester(StrokeCollection strokes, StylusShape eraserShape)
: base(strokes)
{
System.Diagnostics.Debug.Assert(eraserShape != null);
// Create an ErasingStroke objects that implements the actual hit-testing
_erasingStroke = new ErasingStroke(eraserShape);
}
/// <summary>
///
/// </summary>
/// <param name="path"></param>
/// <param name="stylusShape"></param>
/// <returns></returns>
public bool HitTest(IEnumerable<Point> path, StylusShape stylusShape)
{
// Check the input parameters
if (path == null)
{
throw new System.ArgumentNullException("path");
}
if (stylusShape == null)
{
throw new System.ArgumentNullException("stylusShape");
}
if (IEnumerablePointHelper.GetCount(path) == 0)
{
return false;
}
ErasingStroke erasingStroke = new ErasingStroke(stylusShape);
erasingStroke.MoveTo(path);
Rect erasingBounds = erasingStroke.Bounds;
if (erasingBounds.IsEmpty)
{
return false;
}
if (erasingBounds.IntersectsWith(this.GetBounds()))
{
return erasingStroke.HitTest(StrokeNodeIterator.GetIterator(this, this.DrawingAttributes));
}
return false;
}