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/*=========================================================================
Program: Visualization Toolkit
Module: vtkMathTextUtilities.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkMathTextUtilities.h"
#include "vtkFreeTypeUtilities.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkTextProperty.h"
#include "vtkTextActor.h"
#include "vtkViewport.h"
#include "vtkWindow.h"
#ifdef VTK_DEBUG_LEAKS
#include "vtkDebugLeaks.h"
#endif
#include <algorithm>
//----------------------------------------------------------------------------
// The singleton, and the singleton cleanup
vtkMathTextUtilities* vtkMathTextUtilities::Instance = NULL;
vtkMathTextUtilitiesCleanup vtkMathTextUtilities::Cleanup;
//----------------------------------------------------------------------------
// Create the singleton cleanup
// Register our singleton cleanup callback against the FTLibrary so that
// it might be called before the FTLibrary singleton is destroyed.
vtkMathTextUtilitiesCleanup::vtkMathTextUtilitiesCleanup()
{
}
//----------------------------------------------------------------------------
// Delete the singleton cleanup
vtkMathTextUtilitiesCleanup::~vtkMathTextUtilitiesCleanup()
{
vtkMathTextUtilities::SetInstance(NULL);
}
//----------------------------------------------------------------------------
vtkMathTextUtilities* vtkMathTextUtilities::GetInstance()
{
if (!vtkMathTextUtilities::Instance)
{
vtkMathTextUtilities::Instance = static_cast<vtkMathTextUtilities *>(
vtkObjectFactory::CreateInstance("vtkMathTextUtilities"));
// Clean up any leaked references from vtkDebugLeaks if needed
#ifdef VTK_DEBUG_LEAKS
if (!vtkMathTextUtilities::Instance)
{
vtkDebugLeaks::DestructClass("vtkMathTextUtilities");
}
#endif
}
return vtkMathTextUtilities::Instance;
}
//----------------------------------------------------------------------------
void vtkMathTextUtilities::SetInstance(vtkMathTextUtilities* instance)
{
if (vtkMathTextUtilities::Instance == instance)
{
return;
}
if (vtkMathTextUtilities::Instance)
{
vtkMathTextUtilities::Instance->Delete();
}
vtkMathTextUtilities::Instance = instance;
// User will call ->Delete() after setting instance
if (instance)
{
instance->Register(NULL);
}
}
//----------------------------------------------------------------------------
int vtkMathTextUtilities::GetConstrainedFontSize(const char *str,
vtkTextProperty *tprop,
int targetWidth,
int targetHeight,
int dpi)
{
if (str == NULL || str[0] == '\0' || targetWidth == 0 || targetHeight == 0 ||
tprop == NULL)
{
return 0;
}
// Use the current font size as a first guess
int bbox[4];
double fontSize = tprop->GetFontSize();
if (!this->GetBoundingBox(tprop, str, dpi, bbox))
{
return -1;
}
int width = bbox[1] - bbox[0];
int height = bbox[3] - bbox[2];
// Bad assumption but better than nothing -- assume the bbox grows linearly
// with the font size:
if (width != 0 && height != 0)
{
fontSize *= std::min(
static_cast<double>(targetWidth) / static_cast<double>(width),
static_cast<double>(targetHeight) / static_cast<double>(height));
tprop->SetFontSize(static_cast<int>(fontSize));
if (!this->GetBoundingBox(tprop, str, dpi, bbox))
{
return -1;
}
width = bbox[1] - bbox[0];
height = bbox[3] - bbox[2];
}
// Now just step up/down until the bbox matches the target.
while ((width < targetWidth || height < targetHeight) && fontSize < 200)
{
fontSize += 1.;
tprop->SetFontSize(fontSize);
if (!this->GetBoundingBox(tprop, str, dpi, bbox))
{
return -1;
}
width = bbox[1] - bbox[0];
height = bbox[3] - bbox[2];
}
while ((width > targetWidth || height > targetHeight) && fontSize > 0)
{
fontSize -= 1.;
tprop->SetFontSize(fontSize);
if (!this->GetBoundingBox(tprop, str, dpi, bbox))
{
return -1;
}
width = bbox[1] - bbox[0];
height = bbox[3] - bbox[2];
}
return fontSize;
}
//----------------------------------------------------------------------------
vtkMathTextUtilities* vtkMathTextUtilities::New()
{
vtkMathTextUtilities* ret = vtkMathTextUtilities::GetInstance();
if (ret)
{
ret->Register(NULL);
}
return ret;
}
//----------------------------------------------------------------------------
vtkMathTextUtilities::vtkMathTextUtilities()
{
}
//----------------------------------------------------------------------------
vtkMathTextUtilities::~vtkMathTextUtilities()
{
}
//----------------------------------------------------------------------------
void vtkMathTextUtilities::PrintSelf(ostream &os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Instance: " << this->Instance << endl;
}
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