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

[Arnaud Gelas]

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