//<Snippet9>
private void InitializeHitTester(StylusPointCollection collectedPoints)
{
// Deselect any selected strokes.
foreach (Stroke selectedStroke in selectedStrokes)
{
selectedStroke.DrawingAttributes.Color = inkDA.Color;
}
selectedStrokes.Clear();
if (mode == InkMode.Select)
{
// Remove the previously drawn lasso, if it exists.
if (lassoPath != null)
{
presenter.Strokes.Remove(lassoPath);
lassoPath = null;
}
selectionTester =
presenter.Strokes.GetIncrementalLassoHitTester(80);
selectionTester.SelectionChanged +=
new LassoSelectionChangedEventHandler(selectionTester_SelectionChanged);
selectionTester.AddPoints(collectedPoints);
}
}
public override void Perform()
{
IncrementalStrokeHitTester IncrementalStroke = InkCanvas.Strokes.GetIncrementalStrokeHitTester(EraserShape);
IncrementalLassoHitTester IncrementalLasso = InkCanvas.Strokes.GetIncrementalLassoHitTester(OptionIndex % 100);
switch (OptionIndex % 2)
{
case 0: //AddPoint
{
StrokeCollection strokeCollection = InkCanvas.Strokes;
if (IsRandomPoint == true || strokeCollection == null || strokeCollection.Count == 0)
{
IncrementalStroke.AddPoint(Point);
IncrementalLasso.AddPoint(Point);
}
else
{
//get list of all points on the stroke
foreach (Stroke stoke in strokeCollection)
{
StylusPointCollection.Add(stoke.StylusPoints.Reformat(StylusPointCollection.Description));
}
IncrementalStroke.AddPoint(StylusPointCollection[RandomIndex % StylusPointCollection.Count].ToPoint());
IncrementalLasso.AddPoint(StylusPointCollection[RandomIndex % StylusPointCollection.Count].ToPoint());
}
}
break;
case 1: //AddPoints
{
IncrementalLasso.AddPoints(PointCollection);
IncrementalStroke.AddPoints(PointCollection);
}
break;
}
}
