[vtk-developers] New scaling mode for vtkTextActor

[Will Schroeder]

I recommend that you use "MaximumFontSize" or "MaximumSize" instead of
FontSizeCeiling. It's more consistent with existing VTK.
W

On Thu, May 15, 2008 at 3:56 AM, John Platt <jcplatt at dsl.pipex.com> wrote:

> Hi Ken,
>
> Another scaling mode which would be very useful...
>
> The font size used in scalar bar and XY plot titles often becomes
> excessive when only a small number of characters are involved. A simple
> way to mitigate this is to set a font size ceiling on the vtkTextMapper
> constrained font size methods.
>
> Typical use for vtkXYPlotActor, for example, would be
> myXYPlotActor->GetXAxisActor2D()->GetTitleMapper()->SetFontSizeCeiling(1
> 2);
>
> The required changes are
>
> vtkTextMapper.h
> ===============
>
>  // Description:
>  // Set a ceiling on the font size determined by the constrained font
> size
>  // methods. No ceiling is applied for a zero size (the default).
>  vtkSetClampMacro(FontSizeCeiling, int, 0, 100);
>  vtkGetMacro(FontSizeCeiling, int);
>
> protected:
>  int FontSizeCeiling;
>
> vtkTextMapper.cxx
> =================
>
> vtkTextMapper::vtkTextMapper()
> .
>  // No ceiling on the font size is applied on construction.
>  this->FontSizeCeiling = 0;
>
>
> void vtkTextMapper::PrintSelf(ostream& os, vtkIndent indent)
> .
>  os << indent << "FontSizeCeiling: " << this->FontSizeCeiling << "\n";
>
>
> int vtkTextMapper::SetConstrainedFontSize()
>
>  before return insert
>
>  if ( this->FontSizeCeiling && fontSize > this->FontSizeCeiling )
>  {
>     fontSize = this->FontSizeCeiling;
>     tprop->SetFontSize( this->FontSizeCeiling );
>  }
>
> Some further work would be required to expose more of the text actors
> but this gets the ball rolling. It would be very much appreciated if
> some functionality along these lines could be implemented.
>
> Many thanks,
>
> John.
>
>
> -----Original Message-----
> From: vtk-developers-bounces at vtk.org
> [mailto:vtk-developers-bounces at vtk.org] On Behalf Of Moreland, Kenneth
> Sent: 14 May 2008 23:52
> To: vtk-developpers
> Subject: [vtk-developers] New scaling mode for vtkTextActor
>
> Hi folks,
>
> I've been working on ParaView bug #6096
> (http://www.paraview.org/Bug/view.php?id=6096) and as part of the
> solution I would like to implement a new scaling mode to vtkTextActor.
> Right now, vtkTextActor can either used a fixed font or can scale the
> text to fit within the bounds of the prop.  I propose implementing a
> third mode that will scale the font based on the size of the viewport in
> which the prop is placed.
>
> As part of this changed, I would like to deprecate the Set/GetScaledText
> methods and replace them with a Set/GetTextScaleMode to capture the
> tri-scaling state.  Are there any objections?
>
> -Ken
>
>   ****      Kenneth Moreland
>    ***      Sandia National Laboratories
> ***********
> *** *** ***  email: kmorel at sandia.gov
> **  ***  **  phone: (505) 844-8919
>    ***      fax:   (505) 845-0833
>
>
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-- 
William J. Schroeder, PhD
Kitware, Inc.
28 Corporate Drive
Clifton Park, NY 12065
will.schroeder at kitware.com
http://www.kitware.com
518-371-3971 (phone and fax)
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