sotransform(3)
NAME
SoTransform
SYNOPSIS
#include <Inventor/nodes/SoTransform.h> Inherits SoTransformation. Inherited by SoTransformManip.
Detailed Description
The SoTransform class is the 'all-purpose' transformation node type.
Like SoMatrixTransform, nodes of this type gives the application
programmer maximum flexibility when specifying geometry transformations
in a scene graph. If you want to set and keep the various components of
the transformation matrix in separate entities, this node type is
preferable, though.
The order of operations is: first scaling is done, then rotation, then
translation.
- FILE FORMAT/DEFAULTS:
- Transform {
translation 0 0 0
rotation 0 0 1 0
scaleFactor 1 1 1
scaleOrientation 0 0 1 0
center 0 0 0 - }
- Public Member Functions
- virtual SoType getTypeId (void) const
SoTransform (void)
void pointAt (const SbVec3f &frompoint, const SbVec3f &topoint) void getScaleSpaceMatrix (SbMatrix &mat, SbMatrix &inv) const void getRotationSpaceMatrix (SbMatrix &mat, SbMatrix &inv) const void getTranslationSpaceMatrix (SbMatrix &mat, SbMatrix &inv) const void multLeft (const SbMatrix &mat)
void multRight (const SbMatrix &mat) void combineLeft (SoTransformation *nodeonright) void combineRight (SoTransformation *nodeonleft) void setMatrix (const SbMatrix &mat) void recenter (const SbVec3f &newcenter) virtual void doAction (SoAction *action) virtual void GLRender (SoGLRenderAction *action) virtual void callback (SoCallbackAction *action) virtual void getBoundingBox (SoGetBoundingBoxAction *action) virtual void getMatrix (SoGetMatrixAction *action) virtual void pick (SoPickAction *action) virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action) - Static Public Member Functions
- static SoType getClassTypeId (void) static void initClass (void)
- Public Attributes
- SoSFVec3f translation
SoSFRotation rotation
SoSFVec3f scaleFactor
SoSFRotation scaleOrientation SoSFVec3f center - Protected Member Functions
- virtual const SoFieldData * getFieldData (void) const virtual ~SoTransform ()
- Static Protected Member Functions
- static const SoFieldData ** getFieldDataPtr (void)
Constructor & Destructor Documentation
- SoTransform::SoTransform (void)
- Constructor.
- SoTransform::~SoTransform () [protected, virtual]
- Destructor.
- References SoNode::VRML1.
Member Function Documentation
- SoType SoTransform::getClassTypeId (void) [static]
- This static method returns the SoType object associated with objects of this class.
- Reimplemented from SoTransformation.
- Reimplemented in SoCenterballManip, SoHandleBoxManip, SoJackManip, SoTabBoxManip, SoTrackballManip, SoTransformBoxManip, SoTransformManip, and SoTransformerManip.
- SoType SoTransform::getTypeId (void) const [virtual]
- Returns the type identification of an object derived from a class
inheriting SoBase. This is used for run-time type checking and 'downward' casting. - Usage example:
void foo(SoNode * node)
{if (node->getTypeId() == SoFile::getClassTypeId()) {SoFile * filenode = (SoFile *)node; // safe downward cast, knows the type}
else if (node->getTypeId().isOfType(SoGroup::getClassTypeId())) {SoGroup * group = (SoGroup *)node; // safe downward cast, knows the type}} - For application programmers wanting to extend the library with new
nodes, engines, nodekits, draggers or others: this method needs to be
overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually
accomplished by using the pre-defined macros available through for
instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and
SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on. - For more information on writing Coin extensions, see the class
documentation of the toplevel superclasses for the various class
groups. - Reimplemented from SoTransformation.
- Reimplemented in SoCenterballManip, SoHandleBoxManip, SoJackManip, SoTabBoxManip, SoTrackballManip, SoTransformBoxManip, SoTransformManip, and SoTransformerManip.
- const SoFieldData ** SoTransform::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. - Reimplemented from SoTransformation.
- Reimplemented in SoCenterballManip, SoHandleBoxManip, SoJackManip, SoTabBoxManip, SoTrackballManip, SoTransformBoxManip, SoTransformManip, and SoTransformerManip.
- const SoFieldData * SoTransform::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 SoTransformation.
- Reimplemented in SoCenterballManip, SoHandleBoxManip, SoJackManip, SoTabBoxManip, SoTrackballManip, SoTransformBoxManip, SoTransformManip, and SoTransformerManip.
- void SoTransform::initClass (void) [static]
- Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
- Reimplemented from SoTransformation.
- Reimplemented in SoCenterballManip, SoHandleBoxManip, SoJackManip, SoTabBoxManip, SoTrackballManip, SoTransformBoxManip, SoTransformManip, and SoTransformerManip.
- Referenced by SoNode::initClasses().
- void SoTransform::pointAt (const SbVec3f & frompoint, const SbVec3f &
- topoint)
Sets the transformation to translate to frompoint, with a rotation so that the (0,0,-1) vector is rotated into the vector from frompoint to topoint. - References rotation.
- void SoTransform::getScaleSpaceMatrix (SbMatrix & mat, SbMatrix & inv)
- const
Calculates the matrices to/from scale space. - void SoTransform::getRotationSpaceMatrix (SbMatrix & mat, SbMatrix & inv)
- const
Calculates the matrices to/from rotation space. - void SoTransform::getTranslationSpaceMatrix (SbMatrix & mat, SbMatrix &
- inv) const
Calculates the matrices to/from translation space. - void SoTransform::multLeft (const SbMatrix & mat)
- Premultiplies this transformation by mat.
- void SoTransform::multRight (const SbMatrix & mat)
- Postmultiplies this transformation by mat.
- Referenced by combineLeft().
- void SoTransform::combineLeft (SoTransformation * nodeonright)
- Premultiplies this transformation by the transformation in nodeonright.
- References SoAction::apply(), SoGetMatrixAction::getMatrix(), and
multRight(). - void SoTransform::combineRight (SoTransformation * nodeonleft)
- Postmultiplies this transformation by the transformation in nodeonleft.
- References center, SbMatrix::getTransform(), and SoSFVec3f::getValue().
- void SoTransform::setMatrix (const SbMatrix & mat)
- Sets the fields to create a transformation equal to mat.
- void SoTransform::recenter (const SbVec3f & newcenter)
- Sets the center field to newcenter. This might affect one or more of the other fields.
- void SoTransform::doAction (SoAction * action) [virtual]
- This function performs the typical operation of a node for any action.
- Reimplemented from SoNode.
- Reimplemented in SoTransformManip.
- Referenced by callback(), GLRender(), and pick().
- void SoTransform::GLRender (SoGLRenderAction * action) [virtual]
- Action method for the SoGLRenderAction.
- This is called during rendering traversals. Nodes influencing the
rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method. - Reimplemented from SoNode.
- Reimplemented in SoTransformManip.
- References doAction().
- Referenced by SoTransformManip::callback().
- void SoTransform::callback (SoCallbackAction * action) [virtual]
- Action method for SoCallbackAction.
- Simply updates the state according to how the node behaves for the
render action, so the application programmer can use the
SoCallbackAction for extracting information about the scene graph. - Reimplemented from SoNode.
- Reimplemented in SoTransformManip.
- References doAction().
- void SoTransform::getBoundingBox (SoGetBoundingBoxAction * action)
- [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 SoNode.
- Reimplemented in SoTransformManip.
- References SoSFRotation::getValue(), SoSFVec3f::getValue(), rotation,
scaleFactor, SbMatrix::setTransform(), and translation. - void SoTransform::getMatrix (SoGetMatrixAction * action) [virtual]
- Action method for SoGetMatrixAction.
- Updates action by accumulating with the transformation matrix of this node (if any).
- Reimplemented from SoNode.
- Reimplemented in SoTransformManip.
- void SoTransform::pick (SoPickAction * action) [virtual]
- Action method for SoPickAction.
- Does common processing for SoPickAction action instances.
- Reimplemented from SoNode.
- Reimplemented in SoTransformManip.
- References doAction().
- Referenced by SoTransformManip::handleEvent().
- void SoTransform::getPrimitiveCount (SoGetPrimitiveCountAction * action)
- [virtual]
Action method for the SoGetPrimitiveCountAction. - Calculates the number of triangle, line segment and point primitives
for the node and adds these to the counters of the action. - Nodes influencing how geometry nodes calculates their primitive count
also overrides this method to change the relevant state variables. - Reimplemented from SoNode.
Member Data Documentation
- SoSFVec3f SoTransform::translation
- The translation part of the transformation.
- Referenced by getBoundingBox(), and
SoTabBoxDragger::invalidateSurroundScaleCB(). - SoSFRotation SoTransform::rotation
- The rotation part of the transformation.
- Note that there is one very common mistake that is easy to make when
setting the value of a an SoSFRotation field, and that is to
inadvertently use the wrong SbRotation constructor. This example should
clarify the problem:
mytransformnode->rotation.setValue(0, 0, 1, 1.5707963f); - The programmer clearly tries to set a PI/2 rotation around the Z axis,
but this will fail, as the SbRotation constructor invoked above is the
one that takes as arguments the 4 floats of a quaternion. What the
programmer almost certainly wanted to do was to use the SbRotation
constructor that takes a rotation vector and a rotation angle, which is
invoked like this:
mytransformnode->rotation.setValue(SbVec3f(0, 0, 1), 1.5707963f); - Referenced by getBoundingBox(),
SoTabBoxDragger::invalidateSurroundScaleCB(), and pointAt(). - SoSFVec3f SoTransform::scaleFactor
- The scaling part of the transformation.
- Referenced by getBoundingBox().
- SoSFRotation SoTransform::scaleOrientation
- The orientation the object is set to before scaling.
- SoSFVec3f SoTransform::center
- The center point for the rotation.
- Referenced by combineRight().
Author
- Generated automatically by Doxygen for Coin from the source code.