/// <summary>
/// Returns a Bezier smoothed version of the StylusPoints
/// </summary>
/// <returns></returns>
public StylusPointCollection GetBezierStylusPoints()
{
// Since we can't compute Bezier for single point stroke, we should return.
if (_stylusPoints.Count < 2)
{
return(_stylusPoints);
}
// Construct the Bezier approximation
Bezier bezier = new Bezier();
if (!bezier.ConstructBezierState(_stylusPoints,
DrawingAttributes.FittingError))
{
//construction failed, return a clone of the original points
return(_stylusPoints.Clone());
}
double tolerance = 0.5;
StylusShape stylusShape = this.DrawingAttributes.StylusShape;
if (null != stylusShape)
{
Rect shapeBoundingBox = stylusShape.BoundingBox;
double min = Math.Min(shapeBoundingBox.Width, shapeBoundingBox.Height);
tolerance = Math.Log10(min + min);
tolerance *= (StrokeCollectionSerializer.AvalonToHimetricMultiplier / 2);
if (tolerance < 0.5)
{
//don't allow tolerance to drop below .5 or we
//can wind up with an huge amount of bezier points
tolerance = 0.5;
}
}
List <Point> bezierPoints = bezier.Flatten(tolerance);
return(GetInterpolatedStylusPoints(bezierPoints));
}