[vtkusers] From world coordinates to vtkBorderWidget's coordinate???

[Waldo Valenzuela]

Hi Arnaud,

Do you want to draw a 2D rectangle over a 3D scene, parallel to the viewer?

On 11 Apr 2014, at 15:28, Arnaud Gelas <arnaudgelas at gmail.com> wrote:

> Note that I first naively try to set Position and Position2 in world coordinate, but it does not work as well (as it was done in the following broken wiki example: http://cmake.org/Wiki/VTK/Examples/Broken/Cxx/Widgets/BorderWorldCoords )
> 
> 
> On Fri, Apr 11, 2014 at 3:13 PM, Arnaud Gelas <arnaudgelas at gmail.com> wrote:
> Hi all,
> 
> I have world coordinates for both corners of a rectangle and I would like to draw the corresponding rectangle using vtkBorderWidget / vtkBorderRepresentation.
> 
> Assuming the 2 locations are:
>         * double lowerLeftCorner[3], upperRightCorner[3];
> 
> How would you set it to Position and Position2, by the means of PositionCoordinate and Position2Coordinate?
> 
> I have tried the following:
> 
>         vtkSmartPointer< vtkCoordinate > temp = vtkSmartPointer< vtkCoordinate >::New();
>         temp->SetCoordinateSystemToWorld();
>         temp->SetValue( lowerLeftCorner[0], lowerLeftCorner[1], lowerLeftCorner[2] );
> 
>         double* left = temp->GetComputedDoubleDisplayValue( renderer );
> 
>         renderer->DisplayToNormalizedDisplay( left[0], left[1] );
>         renderer->NormalizedDisplayToViewport( left[0], left[1] );
>         renderer->ViewportToNormalizedViewPort( left[0], left[1] );
> 
>         borderRepresentation->GetPositionCoordinate()->SetValue( left[0], left[1] );
> 
> I have tried doing the same for upperRightCorner, or making it relative as it is done inside vtkBorderRepresentation, i.e.
> 
>         borderRepresentation->GetPositionCoordinate()->SetValue( right[0], right[1] );
> 
> or
>         borderRepresentation->GetPositionCoordinate()->SetValue( right[0] - left[0], right[1] - left[1] );
> 
> 
> It does not appear right on the screen afterwards… I am definitively missing something here…
> 
> What is the correct way to proceed?
> 
> 
> I would really appreciate if anyone could enlighten me here!!!
> 
> Best,
> Arnaud
> 
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