private void Checkpoint()
{
this._canAddPoints = false;
this._currentPoints.Clear();
this.CurvesData.Add(CurveData.BuildFrom(this._currentCurveData));
this._currentCurveData.Points.Clear();
this._curves.Add(new Curve((IEnumerable <Path>)Enumerable.ToList <Path>(this._currentCurve)));
this._currentCurve.Clear();
}
public static CurveData BuildFrom(CurveData data)
{
CurveData curveData = new CurveData();
curveData.StrokeBrush = data.StrokeBrush;
curveData.StrokeThickness = data.StrokeThickness;
curveData.Points.AddRange((IEnumerable <Point>)Enumerable.ToList <Point>(data.Points));
return(curveData);
}
public Curve Undo()
{
Curve curve = (Curve)Enumerable.LastOrDefault <Curve>(this._curves);
if (curve == null)
{
return(null);
}
CurveData curveData = (CurveData)Enumerable.LastOrDefault <CurveData>(this.CurvesData);
if (curveData != null)
{
this.CurvesData.Remove(curveData);
}
this._curves.RemoveAt(this._curves.Count - 1);
this.GraffitiCacheData.RemoveLastCurve();
return(curve);
}