Hello, I am new to using PyX and was wondering if it is possible to invert the Y axis so the top left of page is 0,0 and the y value increases as you go towards the bottom of the page?  

I experimented with passing a trafo to the canvas constructor:
trafo.trafo(matrix=((1, 0), (0, -1)), vector=(0, canvasheight))

This seems to work ok for graphics, but then of course all text is upside down.  
I tried applying a similar y flipping transformation to the textattrs to upright it again, but it did not seem to do anything.

Is there any simple solution to this?