SoSpotLightDragger.h

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/*=======================================================================
** Author      : SGI (MMM YYYY)
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/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
//
// Description:
//  This is the include file for the SoSpotLightDragger. 
//  This is a composite dragger which allows independent rotation,
//  translation, and beam spread editting of a spot light.
//
//  It is composed of an SoRotateSphericalDragger (for rotation), 
//  an SoDragPointDragger (for translation), and it creates its own projector
//  handles mouse events for doing it's own dragging of the beam angle.
//
//  The beam is editted by behaving like an SoRotateDiscDragger, but the 
//  plane of the disc is re-defined every time a drag is initiated.
//  The plane always passes through the z axis and the selected point.
//  When the rotation angle is determined, however, the beam is not rotated,
//  but scaled so it looks like an opening or closing umbrella. This is done
//  by scaling evenly in x and y, and a different amount in z, so the distance
//  between the selected point and the origin remains constant.
//
// NOTE TO DEVELOPERS:
//     For info about the structure of SoSpotLightDragger:
//     [1] compile: /usr/share/src/Inventor/samples/ivNodeKitStructure
//     [2] type:    ivNodeKitStructure SoSpotLightDragger.
//     [3] The program prints a diagram of the scene graph and a table with 
//         information about each part.
//
//
//  The following parts in this dragger are created at construction time.
//  'ResourceName' corresponds to the name of the default geometry for the
//  part. The dragger's constructor gets the scene graph for 'ResourceName'
//  by querying the global dictionary ( SoDB::getByName("ResourceName"); ).  
//
//  Resource Name:                      Part Name:
//
//  spotLightOverallMaterial          - material
//
//  spotLightTranslatorLineTranslator - 
//                                    - translator.xTranslator.translator
//                                    - translator.yTranslator.translator
//                                    - translator.zTranslator.translator
//  spotLightTranslatorLineTranslatorActive  - 
//                                    - translator.xTranslator.translatorActive
//                                    - translator.yTranslator.translatorActive
//                                    - translator.zTranslator.translatorActive
//
//  spotLightTranslatorPlaneTranslator- 
//                                    - translator.yzTranslator.translator
//                                    - translator.xzTranslator.translator
//                                    - translator.xyTranslator.translator
//  spotLightTranslatorPlaneTranslatorActive  - 
//                                    - translator.yzTranslator.translatorActive
//                                    - translator.xzTranslator.translatorActive
//                                    - translator.xyTranslator.translatorActive
//
//  spotLightRotatorRotator           - rotator.rotator      
//  spotLightRotatorRotatorActive     - rotator.rotatorActive
//  spotLightRotatorFeedback          - rotator.feedback      
//  spotLightRotatorFeedbackActive    - rotator.feedbackActive
//
//  spotLightBeam                     - beam
//  spotLightBeamActive               - beamActive
//
//  NOTE: This is a translation node that 
//        moves the beam origin relative
//        to the rest of the dragger.
//  spotLightBeamPlacement            - beamPlacement
//
 
 
#ifndef  _SO_SPOT_LIGHT_DRAGGER_
#define  _SO_SPOT_LIGHT_DRAGGER_
 
#include <Inventor/SbLinear.h>
#include <Inventor/draggers/SoDragger.h>
#include <Inventor/fields/SoSFVec3f.h>
#include <Inventor/fields/SoSFFloat.h>
#include <Inventor/fields/SoSFRotation.h>
#include <Inventor/sensors/SoSensor.h>
 
class SoFieldSensor;
class SbPlaneProjector;
 
class  SoSpotLightDragger : public SoDragger
{
  SO_KIT_HEADER(SoSpotLightDragger);
 
  // This gives the dragger an overall material.  It is edited by lightManips
  // to make its dragger match the color of the light.  Any materials within 
  // other parts will override this one. 
  SO_KIT_CATALOG_ENTRY_HEADER(material);
 
  // The translator is kept under a separator along with a
  // rotation that is maintained as the inverse to the rotation of the
  // light. This means that using the rotator does not rotate the
  // coordinate system that we translate the base of the dragger in.
  SO_KIT_CATALOG_ENTRY_HEADER(translatorSep);
  SO_KIT_CATALOG_ENTRY_HEADER(translatorRotInv);
  SO_KIT_CATALOG_ENTRY_HEADER(translator);
  SO_KIT_CATALOG_ENTRY_HEADER(rotator);
  // Beneath a separator, the beamPlacement part places the beam's local
  // space relative to the other parts.
  // The beamSwitch is flipped when the beam is dragged. 
  SO_KIT_CATALOG_ENTRY_HEADER(beamSep);
  SO_KIT_CATALOG_ENTRY_HEADER(beamPlacement);
  SO_KIT_CATALOG_ENTRY_HEADER(beamScale);
  SO_KIT_CATALOG_ENTRY_HEADER(beamSwitch);
  SO_KIT_CATALOG_ENTRY_HEADER(beam);
  SO_KIT_CATALOG_ENTRY_HEADER(beamActive);
 
 public:
  SoSpotLightDragger();
 
  SoSFRotation rotation;
  SoSFVec3f    translation;
  SoSFFloat    angle;
 
 private:
  static void initClass(); // Initialize the class. 
  static void exitClass();
 
 private:
 
  SbPlaneProjector    *planeProj;  // used during interaciton with beam
 
  static void startCB( void *, SoDragger * );
  static void motionCB( void *, SoDragger * );
  static void doneCB( void *, SoDragger * );
 
  void        dragStart();
  void        drag();
  void        dragFinish();
 
  SoFieldSensor *rotFieldSensor;
  SoFieldSensor *translFieldSensor;
  SoFieldSensor *angleFieldSensor;
  static void   fieldSensorCB( void *, SoSensor * );
  static void   valueChangedCB( void *, SoDragger * );
 
  // Returns scaleFactor for beamScale part to display beamAngle.
  void setBeamScaleFromAngle(float beamAngle);
 
  // detach/attach any sensors, callbacks, and/or field connections.
  // Also set geometry of childDraggers to be our default instead of their
  // regular default, using our resources.
  // Called by:            start/end of SoBaseKit::readInstance
  // and on new copy by:   start/end of SoBaseKit::copy.
  // Classes that redefine must call setUpConnections(TRUE,TRUE) 
  // at end of constructor.
  // Returns the state of the node when this was called.
  virtual SbBool setUpConnections( SbBool onOff, SbBool doItAlways = FALSE );
 
  virtual void setDefaultOnNonWritingFields();
 
  virtual ~SoSpotLightDragger();
 
 private:
  static const char geomBuffer[];
};    
 
#endif  /* _SO_SPOT_LIGHT_DRAGGER_ */