[vtk-developers] Taming contrained font size in vtkTextMapper

[Wylie, Brian]

By the way, just as a general observation, I've always considered the
'bar of colors' in the scalar bar actor to be too thick in proportion to
it's length and associated annotation text size. I know it messes up all
the image tests but could the scalar bar be a tad thinner?
 
(How's that for nit-picky :)
 

Brian Wylie - Org 9227 
Sandia National Laboratories 
MS 0822 - Building 880/A1-J 
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________________________________

	From: vtk-developers-bounces+bnwylie=sandia.gov at vtk.org
[mailto:vtk-developers-bounces+bnwylie=sandia.gov at vtk.org] On Behalf Of
John Platt
	Sent: Thursday, July 07, 2005 3:12 PM
	To: vtk-developers at vtk.org
	Subject: [vtk-developers] Taming contrained font size in
vtkTextMapper
	
	

	Hi all,

	 

	The font size used in scalar bar and XY plots 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

	 

	vtkTextMapperEx::vtkTextMapperEx()

	...

	  // No ceiling on the font size is applied on construction.

	  this->FontSizeCeiling = 0;

	 

	void vtkTextMapperEx::PrintSelf(ostream& os, vtkIndent indent)

	...

	  os << indent << "FontSizeCeiling: " << this->FontSizeCeiling
<< "\n";  

	 

	int vtkTextMapperEx::SetConstrainedFontSize()

	 

	before return insert

	 

	  if ( this->FontSizeCeiling && fontSize > this->FontSizeCeiling


	  {

	     fontSize = this->FontSizeCeiling;

	     tprop->SetFontSize( this->FontSizeCeiling );

	  }

	 

	Some further work will be required to expose more of the text
actors but this gets the ball rolling.

	 

	If there are no obvious problems, I would really appreciate it
if this enhancement could be made.

	 

	Many thanks

	 

	John.

	 

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