Don Xml's Grok This

I’m trying to convert some more complex SVG Paths to the equivalent XAML PathSegement elements, and have run into another major stumbling block that I can’t seem to find an easy way around.  In SVG, when describing a path, we can mix relative and absolute positioning when defining the path data.  All the XAML PathSegment examples I’ve found only use Absolute coordinates for their points.  I would think that there is some way to switch to relative coordinates in the PathSegment, but haven’t figured out a way to do this.

In SVG the data attribute of the path element would be something like this: d="M 0,40 c 10,25 0,50 100,100z".  This basically says start at coordinate 0,40, create a bezier segment using the following 4 points, the starting position (0,40),  Point1 is (10,25) relative to the starting position, Point 2 is (0,50) relative to the starting position, and the ending position (aka Point 3) is (100,100) relative to the starting position.  The z just closes the path.

Now in XAML I’d like to do the same:

        <PathGeometry>
          <PathGeometry.Figures>
            <PathFigureCollection>
              <PathFigure>
                <PathFigure.Segments>
                  <PathSegmentCollection>
                    <StartSegment Point="0,40"/>
                    <BezierSegment Point1="10,25" Point2="0,50" Point3="100,100"/>
                    <CloseSegment />
                  </PathSegmentCollection>
                </PathFigure.Segments>
              </PathFigure>
            </PathFigureCollection>
          </PathGeometry.Figures>
        </PathGeometry>

But this example is in Absolute Positioning.  Point1 is coordinate (10,25) instead of the desired coordinate of (10,65).  I could just do that math to translate the points, but I would think that there is some declarative way to get the BezierSegment to switch to relative positioning.

DonXML