SoCenterballDragger(3)

NAME
SoCenterballDragger - The SoCenterballDragger class is a dragger you can rotate and translate.

SYNOPSIS

#include <Inventor/draggers/SoCenterballDragger.h>

Inherits SoDragger.

  Public Member Functions
virtual SoType getTypeId (void) const
virtual const SoNodekitCatalog * getNodekitCatalog (void) const
SoCenterballDragger (void)
virtual void saveStartParameters (void)

  Static Public Member Functions
static SoType getClassTypeId (void)
static const SoNodekitCatalog * getClassNodekitCatalog (void)
static void initClass (void)

  Public Attributes
SoSFRotation rotation
SoSFVec3f center

  Protected Member Functions
virtual const SoFieldData * getFieldData (void) const
virtual ~SoCenterballDragger (void)
void transferCenterDraggerMotion (SoDragger *childdragger)
void setSwitches (SoDragger *activechild)
virtual SbBool setUpConnections (SbBool onoff, SbBool doitalways=FALSE)
virtual void setDefaultOnNonWritingFields (void)
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
virtual void getMatrix (SoGetMatrixAction *action)

  Static Protected Member Functions
static const SoFieldData ** getFieldDataPtr (void)
static const SoNodekitCatalog ** getClassNodekitCatalogPtr (void)
static void fieldSensorCB (void *f, SoSensor *s)
static void valueChangedCB (void *f, SoDragger *d)
static void kidStartCB (void *f, SoDragger *d)
static void kidFinishCB (void *f, SoDragger *d)

  Protected Attributes
SoSFNode XAxis
SoSFNode XAxisSwitch
SoSFNode XCenterChanger
SoSFNode XRotator
SoSFNode YAxis
SoSFNode YAxisSwitch
SoSFNode YCenterChanger
SoSFNode YRotator
SoSFNode ZAxis
SoSFNode ZAxisSwitch
SoSFNode ZCenterChanger
SoSFNode ZRotator
SoSFNode antiSquish
SoSFNode lightModel
SoSFNode rot2X90
SoSFNode rotX90
SoSFNode rotY90
SoSFNode rotator
SoSFNode surroundScale
SoSFNode translateToCenter
SoFieldSensor * rotFieldSensor
SoFieldSensor * centerFieldSensor

  Additional Inherited Members

Detailed Description

The SoCenterballDragger class is a dragger you can rotate and translate. Here's how the dragger looks with its default geometry in the inactive state:

 Screen Shot of Default Dragger

For rotation, click either the ball 'bands' to constrain rotation to happen around the normal vector of the disc, or anywhere else on the (invisible) ball for free-form rotation.

Translation is done by clicking and dragging any of the four arrow markers. Hold SHIFT to constrain translation to a single axis instead of in the plane.

When translating, instead of modifying the translation part of the motion matrix, a center field is updated, and the geometry is moved using an internal transformation node.

Here's a simple usage example, in the form of a scene graph as an iv-file:

#Inventor V2.1 ascii
Separator {
   # The dragger, offset a little bit against the geometry to clip,
   # so as to not mess up the user interface.
   Separator {
      Translation { translation -4 0 0 }
      DEF cbdragger CenterballDragger { }
   }
   # The clipping plane sub-graph.
   TransformSeparator {
      # Connect transformations to those of the dragger.
      Rotation { rotation 0 0 1 0 = USE cbdragger . rotation }
      Translation { translation 0 0 0 = USE cbdragger . center }
      # Use a simple lineset-based indicator to show how the
      # clipping plane is situated in space.
      Coordinate3 {
         point [
          0 2 2, 0 2 -2,
          0 -2 2, 0 -2 -2,
          0 2 -2, 0 -2 -2,
          0 2 2, 0 -2 2
       ]
      }
      LineSet { numVertices [ 2, 2, 2, 2 ] }
      ClipPlane { }
   }
   # Then follows the geometry that gets clipped. For this
   # example, we use a simple sphere.
   Sphere { }
}

 CenterBall Dragger Action Shot

The figure above shows the example scene graph in a viewer with the nearest cross on the centerball dragger selected. Moving the dragger then moves the associated clip plane over the geometry (the sphere in this case).

Constructor & Destructor Documentation

  SoCenterballDragger::SoCenterballDragger (void)
Default constructor, sets up the dragger nodekit catalog with the interaction and feedback geometry.

Nodekit structure (new entries versus parent class marked with arrow prefix):

CLASS SoCenterballDragger
-->"this"
      "callbackList"
      "topSeparator"
         "motionMatrix"
-->      "translateToCenter"
-->      "surroundScale"
-->      "antiSquish"
-->      "lightModel"
         "geomSeparator"
-->         "XAxisSwitch"
-->            "XAxis"
-->         "YAxisSwitch"
-->            "YAxis"
-->         "ZAxisSwitch"
-->            "ZAxis"
-->      "rotator"
-->      "YRotator"
-->      "ZCenterChanger"
-->      "rotX90"
-->      "ZRotator"
-->      "YCenterChanger"
-->      "rotY90"
-->      "XCenterChanger"
-->      "rot2X90"
-->      "XRotator"

(See SoBaseKit::printDiagram() for information about the output formatting.)

Detailed information on catalog parts:

CLASS SoCenterballDragger
PVT   "this",  SoCenterballDragger  ---
      "callbackList",  SoNodeKitListPart [ SoCallback, SoEventCallback ]
PVT   "topSeparator",  SoSeparator  ---
PVT   "motionMatrix",  SoMatrixTransform  ---
      "translateToCenter",  SoMatrixTransform  ---
      "surroundScale",  SoSurroundScale  ---
      "antiSquish",  SoAntiSquish  ---
      "lightModel",  SoLightModel  ---
PVT   "geomSeparator",  SoSeparator  ---
      "rotator",  SoRotateSphericalDragger  ---
      "YRotator",  SoRotateCylindricalDragger  ---
      "ZCenterChanger",  SoTranslate2Dragger  ---
PVT   "rotX90",  SoRotation  ---
      "ZRotator",  SoRotateCylindricalDragger  ---
      "YCenterChanger",  SoTranslate2Dragger  ---
PVT   "rotY90",  SoRotation  ---
      "XCenterChanger",  SoTranslate2Dragger  ---
PVT   "rot2X90",  SoRotation  ---
PVT   "XAxisSwitch",  SoSwitch  ---
      "XAxis",  SoSeparator  ---
PVT   "YAxisSwitch",  SoSwitch  ---
      "YAxis",  SoSeparator  ---
PVT   "ZAxisSwitch",  SoSwitch  ---
      "ZAxis",  SoSeparator  ---
      "XRotator",  SoRotateCylindricalDragger  ---

(See SoBaseKit::printTable() for information about the output formatting.)

  SoCenterballDragger::~SoCenterballDragger (void) [protected], [virtual]
Protected destructor.

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

Member Function Documentation

  SoType SoCenterballDragger::getClassTypeId (void) [static]
This static method returns the SoType object associated with objects of this class.

  SoType SoCenterballDragger::getTypeId (void) const [virtual]
Returns the type identification of an object derived from a class inheriting SoBase. This is used for runtime type checking and 'downward' casting.

Reimplemented from SoDragger.

  const SoFieldData ** SoCenterballDragger::getFieldDataPtr (void) [static], [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.
 Returns the SoFieldData class which holds information about fields in this node.

  const SoFieldData * SoCenterballDragger::getFieldData (void) const [protected], [virtual]
Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoDragger.

  const SoNodekitCatalog * SoCenterballDragger::getClassNodekitCatalog (void) [static]
Returns the nodekit catalog which defines the layout of this class' kit.

  const SoNodekitCatalog * SoCenterballDragger::getNodekitCatalog (void) const [virtual]
Returns the nodekit catalog which defines the layout of this class' kit.

Reimplemented from SoDragger.

  const SoNodekitCatalog ** SoCenterballDragger::getClassNodekitCatalogPtr (void) [static], [protected]
Returns the pointer to the pointer of the nodekit catalog for this class.

  void SoCenterballDragger::initClass (void) [static]
Initializes type system for this dragger class.

Application programmers should usually not have to invoke this method, see documentation of SoInteraction::init().

  void SoCenterballDragger::saveStartParameters (void) [virtual]
This is invoked to save start parameters, to enable draggers to calculate relative motion.

Default method in superclass SoDragger just saves the motion matrix, but subclasses should overload this method if other data needs to be saved.

Reimplemented from SoDragger.

  void SoCenterballDragger::transferCenterDraggerMotion (SoDragger * childdragger) [protected]
Should be called after motion matrix has been updated by a child dragger.

  void SoCenterballDragger::setSwitches (SoDragger * activechild) [protected]
Sets values for the internal SoSwitch parts. If activechild == NULL, all feedback is deactivated.

  SbBool SoCenterballDragger::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 SoCenterballDragger::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.)

This is a virtual method, and the code in it should call SoField::setDefault() with argument TRUE on part fields that should not be written upon scene graph export operations.

This is typically done when:

1.  field value is NULL and part is NULL by default
2.  it is a leaf SoGroup or SoSeparator node with no children
3.  it is a leaf listpart with no children and an SoGroup or SoSeparator container
4.  it is a non-leaf part and it is 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 SoCenterballDragger::fieldSensorCB (void * d, SoSensor * s) [static], [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

  void SoCenterballDragger::valueChangedCB (void * f, SoDragger * d) [static], [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

  void SoCenterballDragger::kidStartCB (void * d, SoDragger * child) [static], [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.
Needed to activate some feedback.

  void SoCenterballDragger::kidFinishCB (void * d, SoDragger * child) [static], [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.
Needed to deactivate some feedback.

  void SoCenterballDragger::getBoundingBox (SoGetBoundingBoxAction * action) [protected], [virtual]
Action method for the SoGetBoundingBoxAction.
Calculates bounding box and center coordinates for node and modifies the values of the action to encompass the bounding box for this node and to shift the center point for the scene more towards the one for this node.
Nodes influencing how geometry nodes calculate their bounding box also override this method to change the relevant state variables.
Reimplemented from SoDragger.

  void SoCenterballDragger::getMatrix (SoGetMatrixAction * action) [protected], [virtual]
Action method for SoGetMatrixAction.
Updates action by accumulating with the transformation matrix of this node (if any).
Reimplemented from SoDragger.

Member Data Documentation

  SoSFRotation SoCenterballDragger::rotation
This field is continuously updated to contain the rotation of the ball.

  SoSFVec3f SoCenterballDragger::center
Continuously updated to contain the current translation from the dragger's internal local origo position.

  SoFieldSensor * SoCenterballDragger::rotFieldSensor [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

  SoFieldSensor * SoCenterballDragger::centerFieldSensor [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Author
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