vtkLabelRenderStrategy.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkLabelRenderStrategy.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 vtkLabelRenderStrategy_h
#define vtkLabelRenderStrategy_h

#include "vtkRenderingLabelModule.h" // For export macro
#include "vtkObject.h"

#include "vtkStdString.h" // For string support
#include "vtkUnicodeString.h" // For unicode string support

class vtkRenderer;
class vtkWindow;
class vtkTextProperty;

class VTKRENDERINGLABEL_EXPORT vtkLabelRenderStrategy : public vtkObject
{
 public:
  void PrintSelf(ostream& os, vtkIndent indent) override;
  vtkTypeMacro(vtkLabelRenderStrategy, vtkObject);

  virtual bool SupportsRotation()
    { return true; }

  virtual bool SupportsBoundedSize()
    { return true; }


  virtual void SetRenderer(vtkRenderer* ren);
  vtkGetObjectMacro(Renderer, vtkRenderer);


  virtual void SetDefaultTextProperty(vtkTextProperty* tprop);
  vtkGetObjectMacro(DefaultTextProperty, vtkTextProperty);

  virtual void ComputeLabelBounds(vtkTextProperty* tprop, vtkStdString label,
                                  double bds[4])
    { this->ComputeLabelBounds(tprop, vtkUnicodeString::from_utf8(label.c_str()),
                               bds); }
  virtual void ComputeLabelBounds(vtkTextProperty* tprop, vtkUnicodeString label,
                                  double bds[4]) = 0;

  virtual void RenderLabel(int x[2], vtkTextProperty* tprop, vtkStdString label)
    { this->RenderLabel(x, tprop, vtkUnicodeString::from_utf8(label)); }
  virtual void RenderLabel(int x[2], vtkTextProperty* tprop, vtkStdString label,
                           int maxWidth)
    { this->RenderLabel(x, tprop, vtkUnicodeString::from_utf8(label), maxWidth); }
  virtual void RenderLabel(int x[2], vtkTextProperty* tprop,
                           vtkUnicodeString label) = 0;
  virtual void RenderLabel(int x[2], vtkTextProperty* tprop,
                           vtkUnicodeString label, int vtkNotUsed(maxWidth))
    { this->RenderLabel(x, tprop, label); }

  virtual void StartFrame() { }

  virtual void EndFrame() { }

  virtual void ReleaseGraphicsResources(vtkWindow *) { }

protected:
  vtkLabelRenderStrategy();
  ~vtkLabelRenderStrategy() override;

  vtkRenderer* Renderer;
  vtkTextProperty* DefaultTextProperty;

private:
  vtkLabelRenderStrategy(const vtkLabelRenderStrategy&) = delete;
  void operator=(const vtkLabelRenderStrategy&) = delete;
};

#endif