/// <summary>
/// Erases all ink hit by the contour of an erasing stroke
/// </summary>
/// <param name="eraserShape">Shape of the eraser</param>
/// <param name="eraserPath">a path making the spine of the erasing stroke </param>
public void Erase(IEnumerable <Point> eraserPath, StylusShape eraserShape)
{
// Check the input parameters
if (eraserShape == null)
{
throw new System.ArgumentNullException(SR.Get(SRID.SCEraseShape));
}
if (eraserPath == null)
{
throw new System.ArgumentNullException(SR.Get(SRID.SCErasePath));
}
if (IEnumerablePointHelper.GetCount(eraserPath) == 0)
{
return;
}
ErasingStroke erasingStroke = new ErasingStroke(eraserShape, eraserPath);
for (int i = 0; i < this.Count; i++)
{
Stroke stroke = this[i];
List <StrokeIntersection> intersections = new List <StrokeIntersection>();
erasingStroke.EraseTest(StrokeNodeIterator.GetIterator(stroke, stroke.DrawingAttributes), intersections);
StrokeCollection eraseResult = stroke.Erase(intersections.ToArray());
UpdateStrokeCollection(stroke, eraseResult, ref i);
}
}
/// <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(Array.Empty <StrokeIntersection>());
}
ErasingStroke erasingStroke = new ErasingStroke(shape, path);
List <StrokeIntersection> intersections = new List <StrokeIntersection>();
erasingStroke.EraseTest(StrokeNodeIterator.GetIterator(this, this.DrawingAttributes), intersections);
return(intersections.ToArray());
}