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SoTrackballDragger Class Reference

The SoTrackballDragger provides the end-user with rotation and scaling interaction possibilities. More...

#include <Inventor/draggers/SoTrackballDragger.h>

Inheritance diagram for SoTrackballDragger::

List of all members.

Public Methods
	SoTrackballDragger (void)
SbBool	isAnimationEnabled (void)
void	setAnimationEnabled (SbBool newval)
Static Public Methods
void	initClass (void)
Public Attributes
SoSFRotation	rotation
SoSFVec3f	scaleFactor
Protected Methods
	~SoTrackballDragger ()
virtual SbBool	setUpConnections (SbBool onoff, SbBool doitalways=FALSE)
virtual void	setDefaultOnNonWritingFields (void)
void	dragStart (void)
void	drag (void)
void	dragFinish (void)
void	setAllPartsActive (SbBool onoroff)
Static Protected Methods
void	startCB (void *f, SoDragger *d)
void	motionCB (void *f, SoDragger *d)
void	finishCB (void *f, SoDragger *d)
void	metaKeyChangeCB (void *f, SoDragger *d)
void	fieldSensorCB (void *f, SoSensor *s)
void	valueChangedCB (void *f, SoDragger *d)
Protected Attributes
SoFieldSensor *	rotFieldSensor
SoFieldSensor *	scaleFieldSensor

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Detailed Description

The SoTrackballDragger provides the end-user with rotation and scaling interaction possibilities.

The dragger has three "bands" around a transparent sphere, which when clicked and dragged will rotate around the three principal axes. In addition, the user can define his own rotation axis by holding down a SHIFT key while clicking with the left mouse button and dragging. A new, distinctively colored axis and dragger band will be then be added.

Free-form rotation on the sphere can be done by clicking and dragging outside the pre-defined "rotation bands".

Scale operations are made available by holding down a CTRL key when clicking when the left mouse button. The dragger is then in scaling mode, and dragging while holding down the mouse button will uniformly scale the trackball sphere.

For the application programmer's convenience, the Coin library also provides a manipulator class called SoTrackballManip, which wraps the SoTrackballDragger into the necessary mechanisms for making direct insertion of this dragger into a scenegraph possible with very little effort.

See also:

SoTrackballManip

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Constructor & Destructor Documentation

SoTrackballDragger::SoTrackballDragger (  void )

Default constructor, sets up the dragger nodekit catalog with the interaction and feedback geometry.

SoTrackballDragger::~SoTrackballDragger (  )  [protected]

Protected destructor. (Dragger classes are derived from SoBase, so they are reference counted and automatically destroyed when their reference count goes to 0.)

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Member Function Documentation

void SoTrackballDragger::initClass (  void )  [static]

Initializes type system for this dragger class. Application programmers should usually not have to invoke this method, see documentation of SoInteraction::initClass(). Reimplemented from SoDragger.

SbBool SoTrackballDragger::isAnimationEnabled (  void )

Whether or not the trackball will start a spin animation after a quick drag-and-release. Note: this feature is not supported yet in the Coin library, so even though if TRUE is returned, spin animations will not be possible to trigger.

void SoTrackballDragger::setAnimationEnabled (  SbBool newval )

Set a flag which will decide whether or not the trackball will start a spin animation after a quick drag-and-release. Note: this feature is not supported yet in the Coin library.

SbBool SoTrackballDragger::setUpConnections (  SbBool onoff, SbBool doitalways = FALSE )  [protected, virtual]

Sets up all internal connections for instances of this class. (This method will usually not be of interest to the application programmer, unless you want to extend the library with new custom nodekits or dragger classes. If so, see the SoBaseKit class documentation.) Reimplemented from SoInteractionKit.

void SoTrackballDragger::setDefaultOnNonWritingFields (  void )  [protected, virtual]

(Be aware that this method is unlikely to be of interest to the application programmer who does not want to extend the library with new custom nodekits or draggers. If you indeed are writing extensions, see the information in the SoBaseKit class documentation.) A virtual method that should call SoField::setDefault() with argument TRUE on part fields that should not be written upon scenegraph export operations. This is typically done when: field value is NULL and part is NULL by default it is a leaf SoGroup or SoSeparator node with no children it is a leaf listpart with no children and a SoGroup or SoSeparator container it is a non-leaf part and it's of SoGroup type and all fields are at their default values Subclasses should usually override this to do additional settings for new member fields. From the subclass, do remember to call "upwards" to your superclass' setDefaultOnNonWritingFields() method. Reimplemented from SoDragger.

void SoTrackballDragger::dragStart (  void )  [protected]

For internal use only.

void SoTrackballDragger::drag (  void )  [protected]

For internal use only.

void SoTrackballDragger::dragFinish (  void )  [protected]

For internal use only.

void SoTrackballDragger::setAllPartsActive (  SbBool onoroff )  [protected]

If the input argument is TRUE, all the geometry parts of the dragger will become highligthed, as when active. Used internally during scaling operations and free-form rotations.

void SoTrackballDragger::startCB (  void * f, SoDragger * d )  [static, protected]

For internal use only.

void SoTrackballDragger::motionCB (  void * f, SoDragger * d )  [static, protected]

For internal use only.

void SoTrackballDragger::finishCB (  void * f, SoDragger * d )  [static, protected]

For internal use only.

void SoTrackballDragger::metaKeyChangeCB (  void * f, SoDragger * d )  [static, protected]

For internal use only.

void SoTrackballDragger::fieldSensorCB (  void * d, SoSensor * s )  [static, protected]

For internal use only. Reimplemented from SoInteractionKit.

void SoTrackballDragger::valueChangedCB (  void * f, SoDragger * d )  [static, protected]

For internal use only.

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Member Data Documentation

SoSFRotation SoTrackballDragger::rotation

This field is continuously updated to contain the rotation of the dragger's trackball.

SoSFVec3f SoTrackballDragger::scaleFactor

Continuously updated to contain the current vector of scaling along the X, Y and Z axes. The three components will always be equal, as this dragger only supports uniform scale operations.

SoFieldSensor * SoTrackballDragger::rotFieldSensor [protected]

For internal use only.

SoFieldSensor * SoTrackballDragger::scaleFieldSensor [protected]

For internal use only.

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The documentation for this class was generated from the following files:

• SoTrackballDragger.cpp
• SoTrackballDragger.h

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