protected virtual void AddPointsToStroke(Contact contact)
{
Stroke stroke = (Stroke)contact.GetUserData(key);
if (stroke == null)
StartStroke(contact);
else
{
StylusPointCollection stylusPoints = stroke.StylusPoints;
if (stylusPoints != null)
{
Point position = contact.GetPosition(this);
stylusPoints.Add(new StylusPoint(position.X, position.Y, 0.5f));
}
}
}
private void EraseStroke(Contact contact)
{
Point position = contact.GetPosition(this);
foreach (Stroke stroke in inkCanvas.Strokes.HitTest(new[] {position}, EraserShape))
{
InkCanvasStrokeErasingEventArgs e = new InkCanvasStrokeErasingEventArgs(stroke);
OnStrokeErasing(e);
if (!e.Cancel)
{
inkCanvas.Strokes.Remove(stroke);
RoutedEventArgs e2 = new RoutedEventArgs(StrokeErasedEvent, this);
RaiseEvent(e2);
}
}
}
protected virtual void StartStroke(Contact contact)
{
StylusPointCollection stylusPoints = new StylusPointCollection();
Point position = contact.GetPosition(this);
stylusPoints.Add(new StylusPoint(position.X, position.Y, 0.5f));
Stroke stroke = new Stroke(stylusPoints, DefaultDrawingAttributes);
inkCanvas.Strokes.Add(stroke);
contact.SetUserData(key, stroke);
}
private void ErasePoint(Contact contact)
{
Point position = contact.GetPosition(this);
Point[] points = new[] { position };
foreach (Stroke stroke in inkCanvas.Strokes.HitTest(points, EraserShape))
{
InkCanvasStrokeErasingEventArgs e = new InkCanvasStrokeErasingEventArgs(stroke);
OnStrokeErasing(e);
if (!e.Cancel)
{
StrokeCollection eraseResult = stroke.GetEraseResult(points, EraserShape);
inkCanvas.Strokes.Replace(stroke, eraseResult);
RoutedEventArgs e2 = new RoutedEventArgs(StrokeErasedEvent, this);
RaiseEvent(e2);
}
}
}