Is there a way of converting plot coords to graph coords?

[Ethan M. <merritt@u.washington.edu>]

Do we have a utility routine somewhere that would convert 
plot coordinates to graph or screen coordinates?

What I want to do is take a mouse-click location,
which is reported in plot coords, and keep track of
where that was on the screen.

The closest I can find is this routine in gnuplot_x11:
 
  /* Convert X-window mouse coords to coordinate system of plot axes */
  static void
  mouse_to_coords(plot_struct *plot, XEvent *event,
                double *x, double *y, double *x2, double *y2)

but it's the wrong direction, and not visible in the core code
anyhow.


-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle WA