Inventor/Qt/viewers/SoQtViewer.h

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/*=======================================================================
** Author      : Alain Dumesny (MMM yyyy)
**=======================================================================*/


#ifndef _SO_QT_VIEWER_
#define _SO_QT_VIEWER_

#include <Inventor/Qt/OivQtCompat.h>
#include <Inventor/Qt/SoQtRenderArea.h>

#include <QPixmap>

#include <Inventor/SoType.h>
#include <Inventor/misc/SoCallbackList.h>
#include <Inventor/SbElapsedTime.h>
#include <Inventor/events/SoKeyboardEvent.h> 
#include <Inventor/Gui/viewers/SoGuiViewer.h>

#include <Inventor/components/stereo/SoStereoViewer.h>

// classes
class SoNode;
class SoDirectionalLight;
class SoGroup;
class SoRotation;
class SoCamera;
class SoDrawStyle;
class SoLightModel;
class SoFieldSensor;
//class SoQtClipboard;
class SoQtViewer;
class SoGetBoundingBoxAction;
class SbPList;
class SoSeparator;
class SoSwitch;
class SoComplexity;
class SoPackedColor;
class SoMaterialBinding;
class SoSFTime;
class SoQtInputFocus;
class SoAlarmSensor;
class SoNodeSensor;
class SoGetPrimitiveCountAction;
class SoStereoViewer;
class SoBaseStereo;
class ScRayPickAction;

typedef void SoQtViewerCB( void* userData, SoQtViewer* viewer );

typedef void SoQtViewerCameraTypeChangeCB( void* userData, SoCamera* camera, SoQtViewer* viewer );

typedef void SoQtViewerFPSCB( float fps, void* userData, SoQtViewer* viewer );

typedef void SoQtViewerDecimationPercentageCB( float percentage, void* userData, SoQtViewer* viewer );

//
//  Class: SoQtViewer
//
//      The Viewer component is the abstract base class for all viewers.
//  It is subclassed from renderArea, adding viewing semantics to Inventor
//  rendering.
//

class  SoQtViewer : public SoQtRenderArea, public SoStereoViewer
{

  Q_OBJECT

    public:

    enum Type
    {
    BROWSER,
    EDITOR
  };


    enum DrawStyle
    {
    VIEW_AS_IS,
    VIEW_HIDDEN_LINE,
    VIEW_NO_TEXTURE,
    VIEW_LOW_COMPLEXITY,
    VIEW_LINE,
    VIEW_POINT,
    VIEW_BBOX,
    VIEW_LOW_RES_LINE,
    VIEW_LOW_RES_POINT,
    VIEW_SAME_AS_STILL
  };

    enum DrawType
    {
    STILL,
    INTERACTIVE
  };

    enum BufferType
    {
    BUFFER_SINGLE,
    BUFFER_DOUBLE,
    BUFFER_INTERACTIVE
  };

    enum DecimationStrategy
    {
    NORMAL,
    FIXED_NUM_TRIANGLES,
    FRAMES_PER_SECOND,
    FIXED_PERCENTAGE
  };

    enum CursorStyle
    {
    CLASSIC,
    XOR,
    SHADOW
  };

  virtual void setSceneGraph( SoNode* newScene );

  virtual SoNode* getSceneGraph();

#ifndef HIDDEN_FROM_DOC
  void saveSceneGraph( const char* fileName ) ;
#endif //HIDDEN_FROM_DOC

  virtual void setCamera( SoCamera* cam );

  SoCamera* getCamera() { return m_guiViewer->getCamera(); }

  virtual void setCameraType( SoType type );

  SoType getCameraType() { return m_guiViewer->getCameraType(); }

  virtual void setPreserveCameraHeightAngle( SbBool flag )
    { m_guiViewer->setPreserveCameraHeightAngle( flag ); }

  virtual SbBool isCameraHeightAnglePreserved() const { return m_guiViewer->isCameraHeightAnglePreserved(); }

  virtual void enableSeekWithOrtho( SbBool flag ) { m_guiViewer->enableSeekWithOrtho( flag ); }

  virtual SbBool isSeekWithOrthoEnabled() const { return m_guiViewer->isSeekWithOrthoEnabled(); }

  virtual void viewAll();

  virtual void saveHomePosition();

  virtual void resetToHomePosition();

  void setCameraTypeChangeCallback( SoQtViewerCameraTypeChangeCB* callback,
                                    void* userdata );

  virtual void setHeadlight( SbBool onOrOff );

  SbBool isHeadlight() { return m_guiViewer->isHeadlight(); }

  SoDirectionalLight* getHeadlight() { return m_guiViewer->getHeadlight(); }

  virtual void setDrawStyle( SoQtViewer::DrawType type,
                             SoQtViewer::DrawStyle style );
  SoQtViewer::DrawStyle getDrawStyle( SoQtViewer::DrawType type );

  virtual void setBufferingType( SoQtViewer::BufferType type );

  SoQtViewer::BufferType getBufferingType()
  { return (SoQtViewer::BufferType)m_guiViewer->getBufferingType(); }

  virtual void setViewing( SbBool onOrOff );

  SbBool isViewing() const { return m_guiViewer->isViewing(); }

  virtual void setCursorEnabled( SbBool onOrOff );

  SbBool isCursorEnabled() const { return m_guiViewer->isCursorEnabled(); }

  void setAutoClipping( SbBool onOrOff );

  SbBool isAutoClipping() const { return m_guiViewer->isAutoClipping(); }

  virtual void setStereoViewing( SbBool onOrOff );

  virtual SbBool isStereoViewing();

  void setStereoOffset( float dist );

  float getStereoOffset();

  void setDetailSeek( SbBool onOrOff ) { m_guiViewer->setDetailSeek( onOrOff ); }

  SbBool isDetailSeek() { return m_guiViewer->isDetailSeek(); }

  void setSeekTime( float seconds ) { m_guiViewer->setSeekTime( seconds ); }

  float getSeekTime() { return m_guiViewer->getSeekTime(); }

  void addStartCallback( SoQtViewerCB* f, void* userData = NULL )
    { m_guiViewer->addStartCallback( (SoGuiViewerCB*)f, userData ); }

  void addFinishCallback( SoQtViewerCB* f, void* userData = NULL )
    { m_guiViewer->addFinishCallback( (SoGuiViewerCB*)f, userData ); }

  void removeStartCallback( SoQtViewerCB* f, void* userData = NULL )
    { m_guiViewer->removeStartCallback( (SoGuiViewerCB*)f, userData ); }

  void removeFinishCallback( SoQtViewerCB* f, void* userData = NULL )
    { m_guiViewer->removeFinishCallback( (SoGuiViewerCB*)f, userData ); }

  virtual void recomputeSceneSize();

  // --- Large Model Viewing additions:

  void setDecimationStrategy( SoQtViewer::DecimationStrategy strategy );

  SoQtViewer::DecimationStrategy getDecimationStrategy()
  { return (SoQtViewer::DecimationStrategy)m_guiViewer->getDecimationStrategy(); }

  void setGoalNumberOfTriangles( int32_t goal );

  int32_t getGoalNumberOfTriangles() { return m_guiViewer->getGoalNumberOfTriangles(); }

  void setGoalFramesPerSecond( float goal );

  float getGoalFramesPerSecond() { return m_guiViewer->getGoalFramesPerSecond(); }

  void setFixedPercentage( float percent );

  float getFixedPercentage() { return m_guiViewer->getFixedPercentage(); }

  void enableFullRenderingWhenStill( SbBool onOff );

  SbBool isFullRenderingWhenStill() { return m_guiViewer->isFullRenderingWhenStill(); }

  SbBool isStillNow() { return m_guiViewer->isStillNow(); }

  void setFramesPerSecondCallback( SoQtViewerFPSCB* callback, void* userData = NULL );

  void setNumSamples( int numFrames );
  int getNumSamples() { return m_guiViewer->getNumSamples(); }

  void setDecimationPercentageCallback( SoQtViewerDecimationPercentageCB *callback, void* userData = NULL );

  float getCurrentDecimationPercentage();

  // Implementing methods from the pure virtual class from SoStereoViewer

  virtual SoCamera* getViewerCamera();

  virtual SbBool isViewerDoubleBuffer();

  virtual void actualRendering();

  virtual const SbVec2s& getSize();

  virtual const SbVec2s& getTopLeft() ;

  virtual const SbVec2s& getBottomRight() ;

  void setStereoViewType( SoBaseStereo* stereo );

  SoBaseStereo* getStereoViewType();

  void reverseStereoView( SbBool reverse );

  SbBool isStereoViewReversed();

  virtual void setStereoAbsoluteAdjustments( SbBool absolute );

  virtual SbBool isStereoAbsoluteAdjustments() const { return m_guiViewer->isStereoAbsoluteAdjustments(); }

  virtual void setStereoBalance( float balance, SbBool nearFrac = false );

  virtual float getStereoBalance();

  virtual SbBool isStereoBalanceNearFrac();

  virtual void setStereoActive( SbBool activate ) ;

  virtual SbBool isStereoActive() ;

  void setViewport( short left, short bottom, short width, short height );

  void getViewport( short& left, short& bottom, short& width, short& height );

  SoSeparator* getSceneRoot() { return m_guiViewer->getSceneRoot(); }

  virtual void setCursorStyle( SoQtViewer::CursorStyle style );

  SoQtViewer::CursorStyle getCursorStyle()
  { return (SoQtViewer::CursorStyle)m_guiViewer->getCursorStyle(); }

  void setAutoClipTolerance ( float tolerance ) { m_guiViewer->setAutoClipTolerance( tolerance ); }

  float getAutoClipTolerance () const { return m_guiViewer->getAutoClipTolerance(); }

  virtual void setCameraSceneGraph(SoNode *cameraSceneGraph);

  SoNode* getCameraSceneGraph();

  void enableMouseWheelDolly(SbBool onOff) { m_guiViewer->enableMouseWheelDolly( onOff ); }

  virtual void setSeekMode( SbBool onOrOff );

  SbBool isSeekMode() { return m_guiViewer->isSeekMode(); }

  virtual void toggleCameraType();

  void  setPickRadius( float radius );

  float getPickRadius() const;

#if 1             SoDEPRECATED
  virtual void adjustClippingPlanes();

#endif 
  SbBool getDepthValue(int x, int y, float &depth)
  {
    return m_guiViewer->getDepthValue(x, y, depth);
  }

private:

  SoGuiViewer* getGuiViewer() const;

  virtual ~SoQtViewer();

  // redefine this routine to also correctly set the buffering type
  // on the viewer.
  virtual void setNormalVisual( QSurfaceFormat vi );

  SbBool isInteractive() const;

  void saveSceneGraph( const SbString& fileName );

  // These members are public only for retro compatibility purposes.
  // They should not be called directly. Use their accessors instead.
  SoCamera* camera;
  SbBool createdCursors, viewingFlag;
  CursorStyle cursorStyle;
  SoSeparator* sceneRoot;
  float sceneSize;
  SoBaseStereo* stereoViewType;
  SbBool m_seekWithOrtho, m_preserveHeightAngle, cursorEnabledFlag, seekDistAsPercentage, computeSeekVariables;
  float m_previousHeightAngle, viewerSpeed, seekDistance;
  SoQtViewer::Type type;
  SoNode* sceneGraph;
  SbVec3f seekPoint, seekNormal, oldCamPosition, newCamPosition;
  SbRotation oldCamOrientation, newCamOrientation;

  void setCurrentDrawStyle(SoQtViewer::DrawStyle style);

  virtual void defineDefaultCursor( const QCursor& cursor );

  virtual void defineFlyCursor( const QCursor& cursor );

  virtual void defineRotationCursor( const QCursor& cursor );

  virtual void defineSeekCursor( const QCursor& cursor );

  virtual void defineTranslationCursor( const QCursor& cursor );

  virtual void defineUpCursor( const QCursor& cursor );

  virtual void defineViewingCursor( const QCursor& cursor );

  virtual void defineWalkCursor( const QCursor& cursor );

  virtual void defineZoomCursor( const QCursor& cursor );

  virtual SoGLContext* getViewerContext() { return getNormalSoContext(); }
  virtual SoSceneManager* getViewerSceneManager() { return getSceneManager(); }

 private:

  // Constructor/Destructor
  SoQtViewer( QWidget* parent,
              const char* name,
              SbBool buildInsideParent,
              SoQtViewer::Type type,
              SbBool buildNow,
              SbBool sync = true );

  SoQtViewer( QWidget* parent,
              const char* name,
              SbBool buildInsideParent,
              SoQtViewer::Type type,
              SbBool buildNow,
              SbBool sync,
              SoGuiViewer* guiViewer );

  // global vars
  SbBool altSwitchBack; // flag to return to PICK after an Alt release

  // Previously declared in subclasses (before v2.6)
  // Note that each subclass viewer uses a subset of these standard
  // cursor names.  Note that the Fly and Walk viewers used slightly
  // different names (that were too generic) for their specific cursors
  // (the last two in the list) prior to v2.6.
  QCursor normalCursor, dollyCursor, panCursor, rollCursor, seekCursor,
    spinCursor, upCursor, flyCursor, walkCursor;

  // Load cursor definitions from resource file.
  // previously declared in subclasses (before v2.6).
  // Subclasses may override, but are not required to do so
  // unless they need more or different cursor definitions.
  virtual void defineCursors();

  // Subclasses should (and do) override this method! (new in v2.6)
  // (The setCursorStyle method calls this to force a dynamic change)
  virtual void updateCursor() {};

  // Subclasses can call this routine to handle a common set of events. A Boolean
  // is returned to specify whether the event was handled by the base class.
  // Currently handled events and functions are :
  // 'Esc' key - toggles viewing on/off
  // When viewing OFF - send all events down the scene graph
  // When camera == NULL - Discard all viewing events
  // 'home' Key - calls resetToHomePosition()
  // 's' Key - toggles seek on/off
  // Arrow Keys - moves the camera up/down/right/left in the viewing plane
  SbBool processCommonEvents( QEvent* xe );

  // Invokes the start and finish viewing callbacks. Subclasses NEED to call
  // those routines when they start and finish doing interactive viewing
  // operations so that correct interactive drawing style and buffering
  // types, as well as application callbacks, gets set and called properly.
  //
  // Those routines simply increment and decrement a counter. When the counter
  // changes from 0->1 the start viewing callbacks are called. When the counter
  // changes back from 1->0 the finish viewing callbacks are called.
  // The counter approach enables different parts of a viewer to call those
  // routines withough having to know about each others (which is not
  //
  void interactiveCountInc();
  void interactiveCountDec();
  int getInteractiveCount() { return m_guiViewer->getInteractiveCount(); }

  //
  // This routine is used by subclasses to initiate the seek animation. Given a
  // screen mouse location, this routine will return the picked point
  // and the normal at that point. It will also schedule the sensor to animate
  // if necessary. The routine retuns TRUE if something got picked...
  //
  // Note: if detailSeek is on, the point and normal correspond to the exact
  // 3D location under the cursor.
  // if detailSeek if off, the object bbox center and the camera
  // orientation are instead returned.
  SbBool seekToPoint( const SbVec2s &mouseLocation );

  //
  // Subclasses CAN redefine this to interpolate camera position/orientation
  // while the seek animation is going on (called by animation sensor).
  // The parameter t is a [0,1] value corresponding to the animation percentage
  // completion. (i.e. a value of 0.25 means that animation is only 1/4 of the way
  // through).
  //
  virtual void interpolateSeekAnimation( float t );
  virtual void computeSeekFinalOrientation();

  // redefine this routine to adjust the camera clipping planes just
  // before doing a redraw. The sensor will be unschedule after the camera
  // is changed in the base class to prevent a second redraw from occuring.
  virtual void actualRedraw();

  // This is called during a paste.
  // Subclasses may wish to redefine this in a way that
  // keeps their viewing paradigm intact.
  virtual void changeCameraValues( SoCamera* newCamera );

  //

  // Convenience routines which subclasses can use when drawing viewer
  // feedback which may be common across multiple viewers. There is for
  // example a convenience routine which sets an orthographics projection
  // and a method to draw common feedback like the roll anchor (used by
  // a couple of viewers).
  //
  // All drawing routines assume that the window and projection is
  // already set by the caller.
  //
  // set an ortho projection of the glx window size - this also turns
  // zbuffering off and lighting off (if necessary).
  static void setFeedbackOrthoProjection( const SbVec2s& glxSize );

  // restores the zbuffer and lighting state that was changed when
  // setFeedbackOrthoProjection() was last called.
  static void restoreGLStateAfterFeedback();

  // draws a simple 2 colored cross at given position
  static void drawViewerCrossFeedback( SbVec2s loc );

  // draws the anchor feedback given center of rotation and mouse location
  static void drawViewerRollFeedback( SbVec2s center, SbVec2s loc );

  virtual void widgetChanged( QWidget* w );

  // redefine this for a better default draw style (need to wait for context)
  virtual void afterRealizeHook();

  // auto clipping routines
  virtual void adjustCameraClippingPlanes();

  // Override redraw() in order to calculate render time including
  // frame buffer switch
  virtual void redraw();

  // Subclasses may override this function to change way that
  // viewer tries to calculate decimation percentage for
  // DecimationStrategy FRAMES_PER_SECOND.
  // Given goal frames per second, timeTaken in last render,
  // and last decimation value used, this function should return
  // decimation percentage value to use in next render.
  virtual float decimationForFramesPerSecond( float fps,
                                              double timeTaken,
                                              float decimation );

  // Subclasses may override this function to change way that
  // viewer tries to calculate decimation percentage for
  // DecimationStrategy FIXED_NUM_TRIANGLES.
  // Given goal number of triangles to reach, this function
  // should return decimation percentage value to use.
  virtual float decimationForNumTriangles( uint32_t numTris );

  // Return a pointer to the QtWidget for stereo
  void* getViewer() {return (void*)this;}

 protected Q_SLOTS:
  void processCommonEnterEvents( unsigned int state );

 private:

#if !defined(_WIN32) && !defined(__APPLE__)
  unsigned int m_zoomBoxPixel;
#endif // UNIX

  void constructorCommon( SoQtViewer::Type t, SbBool buildNow );
  void constructorCommon2( SoQtViewer::Type t, SbBool buildNow );

  SoGuiViewer* m_guiViewer; // Implementation class for SoXxViewer

  // current state vars
  SoQtInputFocus* inputFocus;
  SbBool m_firstRealize;

  // set the zbuffer on current window to correct state
  void setZbufferState();
  SbBool isZbufferOff();
  void arrowKeyPressed( int rawKey );

  // Decimation strategy additions:
  static SoGLRenderAction::AbortCode renderAbortCB( void* data );
  SoAlarmSensor* stillSensor;
  static void alarmCB( void* thisp, SoSensor* ) { ((SoQtViewer*)thisp)->stillSensorCalled(); }
  void stillSensorCalled();

  // PoViews
  static SbBool viewingEventCB( SoQtViewer* viewer, QEvent* anyEvent );

  // Seek animation
  static void seekAnimationSensorCB( void* p, SoSensor* sensor );

  SoNode* m_cameraSceneGraph;  //SUPPR

  // Used to compute the value returned by getSize method
  SbVec2s m_size;
};

#endif /* _SO_QT_VIEWER_ */

---

Open Inventor Toolkit reference manual, generated on 15 Mar 2023
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