[vtkusers] Resizing vtkSliderRepresentation2D

[Eric E. Monson]

Okay, I was able to finally get this to work. Instead of calling Render on the slider widget, it updates properly if I call

sliderRep.Modified()

after I change those point coordinates and before I call Render() on the render window.

I'm not sure exactly how this can help in your situation, Imran...

-Eric

On May 21, 2010, at 1:16 PM, Eric E. Monson wrote:

> The other place where I run into trouble with this issue is when I try to change the size/placement of the widget. I make calls like this (sliderRep is an instance of vtkSliderRepresentation2D, python code):
> 
> sliderRep.GetPoint1Coordinate().SetCoordinateSystemToNormalizedDisplay()
> sliderRep.GetPoint1Coordinate().SetValue(0.1 ,0.07)
> sliderRep.GetPoint2Coordinate().SetCoordinateSystemToNormalizedDisplay()
> sliderRep.GetPoint2Coordinate().SetValue(0.9, 0.07)
> 
> but even after trying the naive methods of re-rendering the widget and window:
> 
> sliderWidget.Render()
> renderWindow.Render()
> 
> the position of the slider isn't updated until I interact with the window.
> 
> -Eric
> 
> On May 21, 2010, at 12:41 PM, imran khan wrote:
> 
>> Karthik:
>> 
>> The issue is that the widget maintains its absolute size when the window is resized. It sizes up correctly when
>> a mouse interaction happens within the rendered area. So what my hack is doing is mimicking a middle button
>> press which indirectly resizes the widgets correctly.
>> 
>> It is not clear what changing the Point1Coordinate and a Point2Coordinate in normalized coordinates would do. As
>> I want to maintain the same normalized locations when the window resizes.
>> 
>> Imran
>> 
>> On Fri, May 21, 2010 at 12:08 PM, Karthik Krishnan <karthik.krishnan at kitware.com> wrote:
>> I'm not sure what that code snippet does, but this is totally not the right way to resize any widget. 
>> 
>> The slider representation has a Point1Coordinate and a Point2Coordinate. These define the end points of the slider (in normlized coordinates [-1, 1]). These iVars just aren't exposed. Modify the code yourself (or derive from vtkSliderRepresentation2D) and expose them so as to resize the widget.
>> 
>> Thanks
>> --
>> karthik
>> 
>> 
>> 
>> 
> 
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