WPF C# Moving and stretching a poyline without iterating on each point

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C#

WPF

I have a polyline with a large number of points and would like to move + stretch it without having to do a for cycle on each point. Is there a geometry translate transform which allows me to do it in a faster way?

At the moment, have selected a curve I recalculate ALL POINTS through:

//1. Move + Stretch
if (newWidth != 0 && newHeight != 0)
{
    Xfactor = (double)newWidth / oldWidth;
    Yfactor = (double)newHeight / oldHeight;
    messages.Add("Moving and Stretching");
}
else
//2. Move only
{
    Xfactor = Yfactor = 1;
    messages.Add("Moving only");
}

PolyLineSegment plDepo = new PolyLineSegment();
PolyLineSegment plSelectedLocal = new PolyLineSegment();
plSelectedLocal = GetPolyLineSegmentFromSelectedPath();

for (int iii = 0; iii < plSelectedLocal.Points.Count(); iii++)
{
    //Per each point I calculate the distance X and Y from the center,
    //I normalize and AFTER I move
    Point prevPoint = new Point(plSelectedLocal.Points[iii].X, plSelectedLocal.Points[iii].Y);
    Point newPoint = new Point((prevPoint.X - piSelected.Center.X) * Xfactor + newCenter.X, (prevPoint.Y - piSelected.Center.Y) * Yfactor + newCenter.Y);
    plDepo.Points.Add(newPoint);
}

SelectedPath.Data = GetGeometryFromPolyLineSegment(plDepo);

so as you can see this implies a lot of calculation iterating on each point. What I would like it would be to work on the Geometry of the curve. That is only one transformation in terms of stretch and move so that i can be achieved more quickly.

Additionally I have to say that all transformation have to be made in code behind and that, since I have several shapes I can't use a viewPort for each of them.

thanks Patrick