vtkMathTextUtilities.h

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/*=========================================================================
 
  Program:   Visualization Toolkit
  Module:    vtkMathTextUtilities.h
 
  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.
 
=========================================================================*/
#ifndef vtkMathTextUtilities_h
#define vtkMathTextUtilities_h
 
#include "vtkObject.h"
#include "vtkRenderingFreeTypeModule.h" // For export macro
#include "vtkTextRenderer.h"            // for metrics
 
class vtkImageData;
class vtkPath;
class vtkTextProperty;
class vtkTextActor;
class vtkViewport;
 
//----------------------------------------------------------------------------
// Singleton cleanup
 
class VTKRENDERINGFREETYPE_EXPORT vtkMathTextUtilitiesCleanup
{
public:
  vtkMathTextUtilitiesCleanup();
  ~vtkMathTextUtilitiesCleanup();
 
private:
  vtkMathTextUtilitiesCleanup(const vtkMathTextUtilitiesCleanup& other) = delete;
  vtkMathTextUtilitiesCleanup& operator=(const vtkMathTextUtilitiesCleanup& rhs) = delete;
};
 
class VTKRENDERINGFREETYPE_EXPORT vtkMathTextUtilities : public vtkObject
{
public:
  vtkTypeMacro(vtkMathTextUtilities, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  virtual bool IsAvailable() { return false; } // Override in subclasses.
 
  static vtkMathTextUtilities* New();
 
  static vtkMathTextUtilities* GetInstance();
 
  static void SetInstance(vtkMathTextUtilities* instance);
 
  virtual bool GetBoundingBox(vtkTextProperty* tprop, const char* str, int dpi, int bbox[4]) = 0;
 
  virtual bool GetMetrics(
    vtkTextProperty* tprop, const char* str, int dpi, vtkTextRenderer::Metrics& metrics) = 0;
 
  virtual bool RenderString(const char* str, vtkImageData* data, vtkTextProperty* tprop, int dpi,
    int textDims[2] = nullptr) = 0;
 
  virtual bool StringToPath(const char* str, vtkPath* path, vtkTextProperty* tprop, int dpi) = 0;
 
  virtual int GetConstrainedFontSize(
    const char* str, vtkTextProperty* tprop, int targetWidth, int targetHeight, int dpi);
 
 
  virtual bool GetScaleToPowerOfTwo() = 0;
  virtual void SetScaleToPowerOfTwo(bool scale) = 0;
 
protected:
  vtkMathTextUtilities();
  ~vtkMathTextUtilities() override;
 
private:
  vtkMathTextUtilities(const vtkMathTextUtilities&) = delete;
  void operator=(const vtkMathTextUtilities&) = delete;
 
 
  static vtkMathTextUtilities* Instance;
  static vtkMathTextUtilitiesCleanup Cleanup;
};
 
#endif