[vtkusers] Chart: coordinate conversions

[nclemeur]

Marcus D. Hanwell-2 wrote:
> 
> I am not clear about which world coordinates you mean - pixel
> coordinates in screen space? The vtkContextMouseEvent object contains
> the item position (Pos), then the Scene and Screen positions, see,
> 
> http://www.vtk.org/doc/nightly/html/classvtkContextMouseEvent.html
> 
> It also contains the last position of each of the above. You can of
> course use the 2D transforms, but in many cases there is no need.
> 

Sorry I should have been more clear, what I was after was not really
coordinates, but I was after the "real value" in the plot (the one of
interest by the end-user). I am not really sure what's the name for that (I
though it was world coordinates). I am actually, displaying the x,y "value"
in the status bar of my wxWidgets application when the mouse is moving. I
don't think these values are available directly in the vtkContextMouseEvent
object (at least I could not find them when breaking in that function). I
guess this similar to what I was posting at:

http://vtk.1045678.n5.nabble.com/vtkChartXY-picking-tp3297279p3298834.html
http://vtk.1045678.n5.nabble.com/vtkChartXY-picking-tp3297279p3298834.html 

I am trying to add a bit of interactivity within my chart window and I am
not really sure that the API allow to do that yet. But I am still in the
process of discovering it (so far I had to modify the vtkChartXY to make
vtkChartXYPrivate protected instead of private, this is not really the way I
want to do it, but I don't think I have access to this data elsewhere).

Cheers

Nicolas



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