[vtkusers] How to remove points/handle from one vtkDistanceWidget or vtkAngleWidget?

[Arnaud GELAS]

Hi Karthik,

Thanks for looking at it!

I have been trying it (by modifying the example from the wiki), but it's 
still not clear to me what has changed in the behaviour of the window? 
and how to "reinitialize the widget"?
I guess I may have made mistakes in the code. Can you have a look and 
tell me what I am doing wrong, please?

Thanks,
Arnaud


On 07/19/2010 02:44 PM, Karthik Krishnan wrote:
> Arnaud:
>
> I just pushed a bunch of changes. The class vtkDistanceWidget, 
> vtkAngleWidget and vtkBiDimensionalWidget all now have the following 
> two methods :
>
>   // Description:
>   // Set the state of the widget to "defined" (in case its widget and its
>   // representation were initialized programmatically). This must 
> generally
>   // be followed by a Render() for things to visually take effect.
>   virtual void WidgetIsDefined();
>
>   // Description:
>   // Has the widget been defined completely yet ? ie. Have the end 
> points been
>   // laid and is it in Manipulate mode ?
>   virtual int IsWidgetDefined();
>
>
> So what you can do is :
>
>  representation->SetPoint1WorldPosition(...)
>  representation->SetPoint2WorldPosition(...)
>  distanceWidget->SetRepresentation(representation);
>  distanceWidget->EnabledOn();
>  distanceWidget->WidgetIsDefined();
>  distanceWidget->Render();
>
> Internally, the WidgetIsDefined() call, sets the widget state to 
> "manipulate", releases any focus that it may have grabbed during the 
> define phase, builds the representation and shows/hides the handles 
> properly.
>
> The same is the case for the other 2 widgets....
>
> If I can slowly add it to a good number of widgets (several widgets 
> have a "define" phase during which their query is invalid), then I'd 
> like to make this a default no-op method in the base class, 
> vtkAbstractWidget, so that subclasses can implement it in whatever way 
> they choose to.
>
> Please let me know if you have any issues.
>
> Thanks
> --
> karthik
>
>
> On Fri, Jul 16, 2010 at 12:38 AM, Karthik Krishnan 
> <karthik.krishnan at kitware.com <mailto:karthik.krishnan at kitware.com>> 
> wrote:
>
>     Yes. That's missing and its an often needed feature. I'll add this
>     functionality in tomorrow Arnaud.
>
>     Thanks
>     --
>     karthik
>
>
>     On Thu, Jul 15, 2010 at 7:37 PM, Arnaud GELAS
>     <arnaud_gelas at hms.harvard.edu
>     <mailto:arnaud_gelas at hms.harvard.edu>> wrote:
>
>         Actually I am more interested in being able to reinitialize
>         these widgets.
>         For instance, when you want to measure different objects that
>         are far apart, and I guess it would be faster to reinitialize
>         the widget than to drag these points to another part of my
>         image (quite far from here).
>
>         How should I proceed?
>
>         Thanks,
>         Arnaud
>
>
>         On 07/15/2010 09:56 AM, Karthik Krishnan wrote:
>>         How can the widget exist in a valid state without its end
>>         points ? Do you mean you want to re-define the widget from
>>         start in response to a key press ?
>>
>>         Please let us know.
>>
>>         Thanks
>>         --
>>         karthik
>>
>>         On Thu, Jul 15, 2010 at 7:21 PM, Arnaud GELAS
>>         <arnaud_gelas at hms.harvard.edu
>>         <mailto:arnaud_gelas at hms.harvard.edu>> wrote:
>>
>>             Hi all,
>>
>>             I would like to be able to
>>              * delete points/handles from these widgets with a key
>>              * reinitialize these widgets without any points/handle
>>             on the screen.
>>
>>             I could not figure out how to proceed?
>>             Is it possible with the existing code?
>>
>>             Thanks,
>>
>>             Best Regards,
>>             Arnaud
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>
>
>

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