Ubuntu Manpage: SoTransformManip — base class for all transform Nodes with built-in 3D user interfaces

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Provided by: inventor-doc_2.1.5-10-18_all

NAME

       SoTransformManip — base class for all transform Nodes with built-in 3D user interfaces

INHERITS FROM

       SoBase > SoFieldContainer > SoNode > SoTransformation > SoTransform > SoTransformManip

SYNOPSIS

       #include <Inventor/manips/SoTransformManip.h>

          Fields from class SoTransform:

     SoSFVec3f           translation
     SoSFRotation        rotation
     SoSFVec3f           scaleFactor
     SoSFRotation        scaleOrientation
     SoSFVec3f           center

          Methods from class SoTransformManip:

                         SoTransformManip()
     SoDragger *         getDragger()
     SbBool              replaceNode(SoPath *p )
     SbBool              replaceManip(SoPath *p, SoTransform *newOne ) const
     static SoType       getClassTypeId()

          Methods from class SoTransform:

     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)

          Methods from class SoNode:

     void                setOverride(SbBool state)
     SbBool              isOverride() const
     SoNode *            copy(SbBool copyConnections = FALSE) const
     virtual SbBool      affectsState() const
     static SoNode *     getByName(const SbName &name)
     static int          getByName(const SbName &name, SoNodeList &list)

          Methods from class SoFieldContainer:

     void                setToDefaults()
     SbBool              hasDefaultValues() const
     SbBool              fieldsAreEqual(const SoFieldContainer *fc) const
     void                copyFieldValues(const SoFieldContainer *fc, SbBool copyConnections = FALSE)
     SbBool              set(const char *fieldDataString)
     void                get(SbString &fieldDataString)
     virtual int         getFields(SoFieldList &resultList) const
     virtual SoField *   getField(const SbName &fieldName) const
     SbBool              getFieldName(const SoField *field, SbName &fieldName) const
     SbBool              isNotifyEnabled() const
     SbBool              enableNotify(SbBool flag)

          Methods from class SoBase:

     void                ref()
     void                unref() const
     void                unrefNoDelete() const
     void                touch()
     virtual SoType      getTypeId() const
     SbBool              isOfType(SoType type) const
     virtual void        setName(const SbName &name)
     virtual SbName      getName() const

DESCRIPTION

SoTransformManip is the base class for all SoTransform nodes that have a built-in 3D user interface.
Since it is derived from SoTransform, any changes to its fields result in the rotation, scaling, and/or
translation of nodes that follow it in the scene graph.

Typically, you will want to replace a regular SoTransform with an SoTransformManip (as when the user
selects an object to be moved), or vice versa (as when the object is deselected, and the motion interface
should go away). Use the replaceNode() method to insert a manipulator into a scene graph, and the
replaceManip() method to remove it when done.

Every subclass of SoTransformManip utilizes a dragger of some sort to provide a 3D interface. (This class
does not have dragger; but all the subclasses do.) However a manipulator differs from a dragger; it
influences other objects in the scene because, as an SoTransform, it alters the state. The fields values
and movement of a dragger, on the other hand, affect only the dragger itself.

Each SoTransformManip subclass utilizes its dragger by adding it as a hidden child. When an action is
applied to the manipulator, such as rendering or handling events, the manipulator first traverses the
dragger, and then the manipulator adds its transformation matrix to the state. When you click-drag-
release over the manipulator, it passes these events down to the dragger, which moves as a result ("I
can't help it, I'm a dragger!").

The manipulator maintains consistency between the fields of the dragger and its own fields. Let's say you
use the mouse to rotate the dragger. Callbacks insure that the rotation field of the manipulator will
change by the same amount, resulting in the rotation of nodes which follow in the scene graph. Similarly,
if you set any of the SoTransformManip fields the manipulator will move the dragger accordingly. You can
use this feature to impose contraints on a manipulator: If the user moves the manipulator so that a field
value becomes too large, you can set the field back to your desired maximum, and the whole thing will
move back to where you specified.

Since each SoTransformManip uses a dragger to provide its interface, you will generally be told to look
at the dragger's reference page for details of how it moves and what the different parts are for. The
interface for the dragger and the manipulator will always be exactly the same. Usually, a
SoTransformManip will surround the objects that it influences (i.e., those that move along with it). This
is because the manipulator turns on the surroundScale part of its dragger; so the dragger geometry
expands to envelope the other objects (see the reference page for SoSurroundScale).

Because the dragger is a hidden child, you can see the dragger on screen and interact with it, but the
dragger does not show up when you write the manipulator to file. Also, any SoPath will end at the
manipulator. (See the Actions section of this reference page for a complete description of when the
dragger is traversed).

If you want to get a pointer to the dragger you can get it from the manipulator using the getDragger()
method. You will need to do this if you want to change the geometry of a manipulator, since the geometry
actually belongs to the dragger.

METHODS

SoTransformManip()
Constructor.

SoDragger * getDragger()
Returns a pointer to the dragger being used by this manipulator. Given this pointer, you can customize
the dragger just like you would any other dragger. You can change geometry using the setPart() method,
or add callbacks using the methods found in the SoDragger reference page.

SbBool replaceNode(SoPath *p )
Replaces the tail of the path with this manipulator. The tail of the path must be an SoTransform node
(or subclass thereof). If the path has a nodekit, this will try to use setPart() to insert the
manipulator. Otherwise, the manipulator requires that the next to last node in the path chain be a
group.

The field values from the transform node will be copied to this manipulator, and the transform will be
replaced.

The manipulator will not call ref() on the node it is replacing. The old node will disappear if it has
no references other than from the input path p and its parent, since this manipulator will be
replacing it in both of those places. Nor will the manipulator make any changes to field connections
of the old node. The calling process is thus responsible for keeping track of its own nodes and field
connections.

SbBool replaceManip(SoPath *p, SoTransform *newOne ) const
Replaces the tail of the path, which must be this manipulator, with the given SoTransform node. If the
path has a nodekit, this will try to use setPart() to insert the new node. Otherwise, the manipulator
requires that the next to last node in the path chain be a group.

The field values from the manipulator will be copied to the transform node, and the manipulator will
be replaced.

The manipulator will not call ref() or unref() on the node which is replacing it, nor will it make
any changes to field connections. The calling process is thus responsible for keeping track of its own
nodes and field connections.

static SoType getClassTypeId()
Returns type identifier for this class.

ACTION BEHAVIOR

       SoGLRenderAction,  SoCallbackAction,  SoGetBoundingBoxAction,   SoGetMatrixAction,   SoHandleEventAction,
       SoRayPickAction
          First,  traverses  the  dragger  the way an SoGroup would. All draggers place themselves in space, but
          leave the current transformation unchanged when finished.  Then  the  SoTransformManip  accumulates  a
          transformation into the current transformation just like its base class, SoTransform.

     SoSearchAction
          Searches just like an SoTransform. Does not search the dragger, which is a hidden child.

     SoWriteAction
          Writes  out  just  like  an  SoTransform.  Does not write the dragger, which is a hidden child. If you
          really need to write valuable information about the dragger, such  as  customized  geometry,  you  can
          retrieve the dragger with the getDragger() method and then write it out separately.

FILE FORMAT/DEFAULTS

       TransformManip {
          translation       0 0 0
          rotation          0 0 1  0
          scaleFactor       1 1 1
          scaleOrientation  0 0 1  0
          center            0 0 0
     }