[vtkusers] vtkXYPlotActor

[Justin Giles]

Can anyone tell me how ViewportToPlotCoordinate is supposed to work?  No
matter what I do I keep getting X = -25.8051 and Y = -0.167051.

What I do when the mouse is clicked is the following:
(plot is my vtkXYPlotActor object, renderer is my vtkRenderer object)
-----------------------
    vtkRenderWindowInteractor* iren =
vtkRenderWindowInteractor::SafeDownCast(obj);
    int event_pos[2];
    iren->GetEventPosition(event_pos); //generates X/Y coordinates based on
viewport where 0,0 is bottom left of window
    plot->SetViewportCoordinate(event_pos[0], event_pos[1]);
    double pos2[3];
     plot->ViewportToPlotCoordinate(renderer, pos2[0], pos2[1]);

//cout always shows -25.8051 and -0.167051
    cout << pos2[0] << " : " << pos2[1] << endl;
-------------------------------

Any thoughts on this?  Am I doing something wrong?  My assumption on how
this should work is that I would get coordinates based on the X/Y axis of
the actual 2D plot.

I've been stuck on this for quite a few days, so any help would be
appreciated.

Thanks,

Justin
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