I'm using Pmw.Blt.Graph to plot a line graph. I need to mark up this graph with additional data visualized in a way that Graph doesn't seem to be able to draw. (I thought I could use line_create's trace parameter to do it, but trace's behavior currently breaks when you change the axis mins and maxes, which I need to do.)
Some possible directions a solution might go in: is there a way to get draw access to the Tk canvas that Graph draws onto? Or is there a way to overlay another canvas on top of that? In either of these cases I'll also probably need a callback or some other mechanism to notify me when the graph gets redrawn.