NAME
SoCenterballDragger -
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:
SYNOPSIS
#include <Inventor/draggers/SoCenterballDragger.h>
Inherits SoDragger.
Public Member Functions
SoCenterballDragger (void)
virtual void saveStartParameters (void)
Static Public Member Functions
static void initClass (void)
Public Attributes
SoSFRotation rotation
SoSFVec3f center
Protected Member Functions
virtual ~SoCenterballDragger (void)
void transferCenterDraggerMotion (SoDragger *childdragger)
void setSwitches (SoDragger *activechild)
virtual SbBool setUpConnections (SbBool onoff, SbBool doitalways=0)
virtual void setDefaultOnNonWritingFields (void)
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
virtual void getMatrix (SoGetMatrixAction *action)
Static Protected Member Functions
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
SoFieldSensor * rotFieldSensor
SoFieldSensor * centerFieldSensor
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:
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 { }
}
.fi
Constructor & Destructor Documentation
SoCenterballDragger::SoCenterballDragger (void) Default constructor, sets
up the dragger nodekit catalog with the interaction and feedback
geometry.
Node kit 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"
.fi
(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 ---
.fi
(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
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().
Reimplemented from SoDragger.
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 = 0) [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 scenegraph 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’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 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.
Reimplemented from SoInteractionKit.
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::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 calculates their bounding box also
overrides 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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