hiding far labels

[Murat Aydın]

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Hi,

 

I am trying this example :

http://public.kitware.com/cgi-bin/viewcvs.cgi/*checkout*/Rendering/Testing/Cxx/TestLabelPlacerCoincidentPoints.cxx?root=VTK&content-type=text/plain

 

How can i hide far labels ? There are many labels and its hard to understand which label belongs to which object.

 

Whats MaximumLabelFraction of vtkLabelPlacer?

 

Another question is how can i display labels vertical. i set LabelGravity to 

[Jeff Baumes]

2009/11/9 Murat Aydın <murat.aydin@...>

Hi,

 

I am trying this example :

http://public.kitware.com/cgi-bin/viewcvs.cgi/*checkout*/Rendering/Testing/Cxx/TestLabelPlacerCoincidentPoints.cxx?root=VTK&content-type=text/plain

 

How can i hide far labels ? There are many labels and its hard to understand which label belongs to which object.

You can hide labels that are behind other objects with UseDepthBufferOn(). There is no explicit way to turn off far labels, except that the labeler should automatically try to place labels close to the camera first, so far labels should be less frequent.

 

 

Whats MaximumLabelFraction of vtkLabelPlacer?

Maximum amount of screen space labels can take up before placement stops. I've checked in a documentation fix.

 

 

Another question is how can i display labels vertical. i set LabelGravity to 

   VerticalBottomBit , VerticalBaselineBit

  but labels are not displayed vertical.

These flags just adjust the where the text is vertically aligned, not the rotation. The default text rendering strategy (freetype) does not support nicely rotated text. To get rotated text labels, you would need:

1. Compile VTK with VTK_USE_QT.

2. Use vtkLabelPlacementMapper instead of vtkLabelPlacer (it has similar API but a few more features).

3. Set the label rendering strategy to an instance of vtkQtLabelRenderStrategy.

4. Set the orientation of the text property in vtkPointSetToLabelHierarchy to the angle you desire (e.g. 90.0).

Most of this code to do this is in

Views/Testing/Cxx/TestQtLabelStrategy.cxx

Jeff

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[Murat Aydın]

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Hi,

 

Thanks for your help. I dont have vtkLabelPlacementMapper class in vtk 5.4.2. I am using vtkLabelPlacer and i couldnt find something similar to

UseDepthBufferOn in vtkLabelPlacer. When i compile with vtk_use_qt, i cant wrap some classes and methods (i am use .net wrapper for vtk).

 

Kind Regards,

 

murat

 

 

----- Original Message -----

From: jeff.baumes@...

To: murat.aydin@...

Cc: vtkusers@...

Sent: Tuesday, November 10, 2009 3:58 PM

Subject: Re: [vtkusers] hiding far labels

2009/11/9 Murat Aydın <murat.aydin@...>

Hi,

 

I am trying this example :

http://public.kitware.com/cgi-bin/viewcvs.cgi/*checkout*/Rendering/Testing/Cxx/TestLabelPlacerCoincidentPoints.cxx?root=VTK&content-type=text/plain

 

How can i hide far labels ? There are many labels and its hard to understand which label belongs to which object.

You can hide labels that are behind other objects with UseDepthBufferOn(). There is no explicit way to turn off far labels, except that the labeler should automatically try to place labels close to the camera first, so far labels should be less frequent.

 

 

Whats MaximumLabelFraction of vtkLabelPlacer?

Maximum amount of screen space labels can take up before placement stops. I've checked in a documentation fix.

 

 

Another question is how can i display labels vertical. i set LabelGravity to 

   VerticalBottomBit , VerticalBaselineBit

  but labels are not displayed vertical.

These flags just adjust the where the text is vertically aligned, not the rotation. The default text rendering strategy (freetype) does not support nicely rotated text. To get rotated text labels, you would need:

1. Compile VTK with VTK_USE_QT.

2. Use vtkLabelPlacementMapper instead of vtkLabelPlacer (it has similar API but a few more features).

3. Set the label rendering strategy to an instance of vtkQtLabelRenderStrategy.

4. Set the orientation of the text property in vtkPointSetToLabelHierarchy to the angle you desire (e.g. 90.0).

Most of this code to do this is in

Views/Testing/Cxx/TestQtLabelStrategy.cxx

Jeff

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["Björn Zehner"]

Dear friends of VTK,
 
I want to interpolate the point attributes between different data sets (with the same topology of course) and I tried to use the vtkInterpolateDataSetAttributes filter for this. Generally it seems to work, but the output data set always only has one of the scalar values interpolated (the first one). The rest seems to be missing. I also tried to use the following line:

SetInputArrayToProcess(0, 0, 0, vtkDataObject::FIELD_ASSOCIATION_POINTS, "SomeName")

But it then still just interpolates the first DataArray. What do I need to do to get all scalars interpolated? Some hint would be appreciated.
Kind regards,
Björn Zehner

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Tel: ++49 [phone]
Fax: ++49 [phone]


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