xaml - How to get correct position of DrawingImage in WPF -

i have code:

<canvas>     <image canvas.left="0" canvas.top="0">         <image.source>             <drawingimage>                 <drawingimage.drawing>                     <geometrydrawing>                         <geometrydrawing.pen>                             <pen brush="black" thickness="1" />                         </geometrydrawing.pen>                         <geometrydrawing.geometry>                             <linegeometry startpoint="50,50" endpoint="100,50">                             </linegeometry>                         </geometrydrawing.geometry>                     </geometrydrawing>                 </drawingimage.drawing>             </drawingimage>         </image.source>     </image> </canvas> 

i hope can line start 50,50 100,50, starts 0,0 50,0 seems startpoint in geometrydrawing makes no sense? know solution? don't want modify canvas.left , canvas.top.

apparently drawingimage adjusted bounds of drawn geometry. around that, may replace linegeometry pathgeometry contains point (0,0), not draw it:

<geometrydrawing.geometry>     <pathgeometry>         <pathfigure startpoint="0,0">             <linesegment point="50,50" isstroked="false"/>             <linesegment point="100,50"/>         </pathfigure>     </pathgeometry> </geometrydrawing.geometry> 

note startpoint="0,0" default value. it's here clarity.