[vtkusers] vtkChart - difficulty changing title colour and font size

[John Platt]

Hi Arnaud,

Unfortunately this has no effect either. I looked into the code and 
vtkOpenGLContextDevice2D::DrawString()

searches a cache for previously rendered strings (I think). The key for the search is composed of an Id created by 

vtkFreeTypeTools::MapTextPropertyToId()

plus the string. The Id does not use the text colour (just family, bold, italic & angle). So it keeps finding the old string.

Thanks for your help.

John.

  ----- Original Message ----- 
  From: Arnaud BARRE 
  To: John Platt 
  Cc: vtkusers 
  Sent: Tuesday, December 18, 2012 9:46 PM
  Subject: Re: [vtkusers] vtkChart - difficulty changing title colour and font size


  Hi John,



  You may need to set the chart as modified: myChart->Modified();


  It this doesn't work, could you write a minimal example to able to replicate your problem?


  Arnaud




  On Tue, Dec 18, 2012 at 10:12 PM, John Platt <jcplatt at dsl.pipex.com> wrote:

    Hi Arnaud,

    Thanks for your suggestion but it does not change the behaviour.
    Here is my code for changing the chart title colour ...

        vtkTextProperty* txtProp = myChart->GetTitleProperties();
        txtProp->SetColor( r, g, b );
        myChart->GetScene()->SetDirty( true );

    Thanks for your help.

    John.

    ----- Original Message ----- 
      From: Arnaud BARRE 
      To: John Platt 
      Sent: Tuesday, December 18, 2012 6:19 PM
      Subject: Re: [vtkusers] vtkChart - difficulty changing title colour and font size


      How do you modify these properties? You can use the method vtkScene::SetDirty. For example chart->GetScene()->SetDirty(true); This should update your modifications in the next rendering.


      Arnaud




      On Tue, Dec 18, 2012 at 7:07 PM, John Platt <jcplatt at dsl.pipex.com> wrote:

        Hi,

        I'm having trouble changing the text colour and font size of the chart & axes titles. They will change when bold or italic is toggled and also after a lot of zooming in the chart. Maybe there is some issue with caching. Has anybody else had problems?

        VTK 5.8.0,  Qt 4.6.2, Win XP, VS 2008

        Thanks,

        John.

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