隐藏绘制的点

我有一个函数在我的类Drawing称为drawPoly(...)，这个函数绘制点并连接它们。我想要的是，如何将它们隐藏在画布中?我有8个实例我的班级绘图。如果可能的话，我不想删除整个Canvas，只是隐藏绘制的点。

private double t = 0;     // x Startpostion für Graph
private double xOld = 0;  // x Startpostion für Graph
private double yOld = 100;
System.Windows.Shapes.Path path;    
public GeometryGroup pointGroupDrawing = new GeometryGroup();
...
public void drawPoly(double value, Brush colorBrush, int thickness)
{
    // is for the x-Axis /time
    t++;
    // get old value and generate new point 
    Point pOne = new Point(xOld, yOld);
    Point pTwo = new Point(t, value);
    // connect old point wit new point
    GeometryGroup lineGroup = new GeometryGroup();
    LineGeometry connectorGeometry = new LineGeometry();
    connectorGeometry.StartPoint = pOne;
    connectorGeometry.EndPoint = pTwo;
    lineGroup.Children.Add(connectorGeometry);
    path = new System.Windows.Shapes.Path();
    path.Data = lineGroup;
    path.StrokeThickness = thickness;
    path.Stroke = path.Fill = colorBrush;
    // collect point for redrawing later ?
    pointGroupDrawing.Children.Add(connectorGeometry);
    // replace old point with new
    xOld = t;
    yOld = value;
    coordinateSystem.Children.Add(path);        
}

我可以用这个pointGroupDrawing.Children.Add(connectorGeometry);来隐藏旧点吗?