SliceScaleBar.h

//
// SliceScaleBar utility class
//
// Mike Heck, VSG Inc, December 2011
//

//
// This class is part of the Open Inventor Medical utility library.
//
// The medical utility classes are provided as a prebuilt library named
// "fei_inventor_medical", that can be used directly in an Open Inventor
// application. The classes in the prebuilt library are documented and
// supported by Thermo Fisher Scientific. These classes are also provided as source code.
//
// Please see $OIVHOME/include/Medical/InventorMedical.h for the full text.
//
 
#ifndef _SLICE_SCALE_BAR_H
#define _SLICE_SCALE_BAR_H
 
#include <Inventor/nodes/SoAnnotation.h>
 
#include <Inventor/fields/SoSFEnum.h>
#include <Inventor/fields/SoSFFloat.h>
#include <Inventor/fields/SoSFInt32.h>
#include <Inventor/fields/SoSFNode.h>
#include <Inventor/fields/SoSFString.h>
#include <Inventor/fields/SoSFVec2f.h>
 
class SoAction;
class SoDrawStyle;
class SoFont;
class SoLineSet;
class SoMaterial;
class SoSeparator;
class SoText2;
class SoTranslation;
class SoVertexProperty;
class SoNodeSensor;

 
class INVENTORMEDICAL_API SliceScaleBar : public SoAnnotation {
 
  SO_NODE_HEADER(SliceScaleBar);
 
public:

  SoSFVec2f position;

  SoSFFloat length;

  SoSFInt32 numTickIntervals;

  SoSFNode trackedCamera;

  SoSFEnum orientation;

  SoSFEnum alignment;

  SoSFString label;

  enum Orientation {
    HORIZONTAL = 0,
    VERTICAL = 1
  };

  enum Alignment {
    LEFT = 0,
    BOTTOM = 0,
    CENTER = 1,
    RIGHT = 2,
    TOP = 2
  };

  SliceScaleBar();

  static void   initClass();

  static void   exitClass();
 
private:
  virtual ~SliceScaleBar();

  void buildSceneGraph();

  void computeEndPoints( SbVec3f& p0, SbVec3f& p1 );
 
  SoRef<SoSeparator>      m_lineSep;
  SoRef<SoLineSet>        m_axisLineSet;
  SoRef<SoVertexProperty> m_vertProp;
 
  SoRef<SoSeparator>      m_textSep;
  SoRef<SoTranslation>    m_labelPos;
  SoRef<SoFont>           m_labelFont;
  SoRef<SoText2>          m_labelText;
 
  // TODO: Add title and labels
  //SoRef<SoFont>           m_fontNode;
 
  bool  m_fieldsChanged; // Set when fields have changed
  float m_ndcLength;     // Same as length field if not tracked
  SbVec3f m_p0;          // Current end-points in NDC
  SbVec3f m_p1;          //   (they depend on orientation and alignment)
 
  int       m_tickLenPix;  // Target tick line length in pixels
  float     m_tickLenNdc;  // Tick line length in NDC (depends on viewport)
  SbVec2i32 m_winSizePix;  // Window size in pixels
  SbVec2f   m_pixelPerNdc; // Converts 1 ndc unit to pixels (but not a coordinate)
 
  SoNodeSensor* m_sensor; // Monitors changes to our fields
  static void sensorCB( void* data, SoSensor* sensor ); 
  
  static void staticCB( void* data, SoAction* action ); // Called during traversal
  void renderCB( SoAction* action );
 
  void resetLines();                        // Remove all lines
  void addLine( SbVec3f& p0, SbVec3f& p1 ); // Add a new line (e.g. tick)
 
  void updateAxis(); // Recreate/reposition axis geometry
};
 
#endif