[vtkusers] vtkXYPlotActor

[Shakes]

Hi Justin,

This link might help, not for XY Plot class but for picking values from 
the renderer by Mark Wyszomierski.

<http://devsample.org/index.php?option=com_content&task=view&id=48&Itemid=27>

Its got iren->GetEventPosition(event_pos) stuff, uses the Picker class. 
Let me know how u go.... I will probably need to do this later. ;)

HTH
Cheers
Shakes

Justin Giles wrote:
> 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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