Inventor/SbViewportRegion.h

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/*=======================================================================
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/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/


#ifndef  _SB_VIEWPORT_REGION_
#define  _SB_VIEWPORT_REGION_

//
//  Class: SbViewportRegion
//
//  Class that represents the active viewport region in a display
//  window. It contains the screen-space size of the window as well as
//  the origin and size of the viewport within the window. By default,
//  the viewport is the same as the full window. Methods allow the
//  viewport to be set either in terms of screen space pixels or as
//  normalized coordinates, where (0,0) is the lower-left corner of
//  the window and (1,1) is the upper-right corner.
//

#include <Inventor/SbLinear.h>

class  SbViewportRegion {

 public:
  SbViewportRegion();
  
  SbViewportRegion(short width, short height, float newScale = 1.0);

  SbViewportRegion(SbVec2s   winSize, float newScale = 1.0);

  SbViewportRegion(SbVec2i32 winSize, float newScale = 1.0);
  
  SbViewportRegion(const SbViewportRegion &vpReg);
  
  void setWindowSize(short width, short height)
    { setWindowSize(SbVec2i32(width, height)); }

  void setWindowSize(SbVec2s winSize);

  void setWindowSize(SbVec2i32 winSize);
  
  void setViewport(float left, float bottom, float width, float height)
    { setViewport(SbVec2f(left, bottom), SbVec2f(width, height)); }
  
  void setViewport(SbVec2f origin, SbVec2f size);
  
  void setViewportPixels(short left, short bottom, short width, short height)
    { setViewportPixels(SbVec2i32(left, bottom), SbVec2i32(width, height)); }

  void setViewportPixels(SbVec2s origin, SbVec2s size);

  void setViewportPixels(SbVec2i32 origin, SbVec2i32 size);
  
  const SbVec2s &getWindowSize() const;
 
  const SbVec2i32 &getWindowSize_i32() const;

  const SbVec2f &getViewportOrigin() const
    { return vpOrigin; }

  const SbVec2s &getViewportOriginPixels() const;

  const SbVec2i32 &getViewportOriginPixels_i32() const;

  const SbVec2f &getViewportSize() const
    { return vpSize; }
  
  const SbVec2s &getViewportSizePixels() const;

  const SbVec2i32 &getViewportSizePixels_i32() const;

  float getViewportAspectRatio() const;

  void scaleWidth(float ratio);

  void scaleHeight(float ratio);
  
  void setPixelsPerInch(float ppi)
    { pixelsPerInch = ppi; }

  float getPixelsPerInch() const
    { return pixelsPerInch; }
  
  float getPixelsPerPoint() const
    { return (pixelsPerInch / s_historicalPixelPerInch); }

  SbVec2f normalize( const SbVec2s& position ) const;

   friend int operator ==(const SbViewportRegion &reg1,
                         const SbViewportRegion &reg2);

   friend int operator !=( const SbViewportRegion &reg1, const SbViewportRegion &reg2 )
  {
    return !operator==( reg1, reg2 );
  }

 private:

  SbViewportRegion(SbVec2s viewSize, SbVec2s winSize, float newScale = 1.0);

  void setViewportScale(float vpScale)
    { viewportScale = vpScale; }

  float getViewportScale() const
    {return viewportScale; }
 
  static const float s_historicalPixelPerInch;
  static float s_defaultPixelsPerInch;
  static void setDefaultPixelsPerInch(float ppi)
    { s_defaultPixelsPerInch = ppi; }
  
 private:
  SbVec2i32 windowSize_i32;  // Window size in pixels
  SbVec2s   windowSize;      // Window size in pixels
  SbVec2f   vpOrigin;        // Viewport origin, normalized
  SbVec2s   vpOriginPix;     // Viewport origin in pixels
  SbVec2i32 vpOriginPix_i32; // Viewport origin in pixels
  SbVec2f   vpSize;          // Viewport size, normalized
  SbVec2s   vpSizePix;       // Viewport size in pixels
  SbVec2i32 vpSizePix_i32;   // Viewport size in pixels
  SbBool    vpSet;           // TRUE if viewport was set explicitly
  float     pixelsPerInch;   // Number of pixels per inch
  float     viewportScale;   // Viewport scale (used for remote rendering)
  
  // Sets viewport to be full window
  void setFullViewport();
  
  // Adjusts viewport pixel size based on new window size or new viewport
  void adjustViewport();
};
 
class  SoGetView {
 public:
  SoGetView();
  virtual ~SoGetView() {};

  virtual SbBool getViewportIsEnabled() const;

  virtual const SbVec2f getViewportOrigin() const;

  virtual const SbVec2f getViewportSize() const;
};

#endif /* _SB_VIEWPORT_REGION_ */

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Open Inventor Toolkit reference manual, generated on 15 Mar 2023
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