SoSurroundScale - transformation node that adjusts the current matrix so a default cube will surround other objects

SoBase > SoFieldContainer > SoNode > SoTransformation > SoSurroundScale

#include <Inventor/nodes/SoSurroundScale.h> Fields from class SoSurroundScale: c } c } numNodesUpToContainer

c } c } numNodesUpToReset Methods from class SoSurroundScale: c } c } SoSurroundScale()

c } c } invalidate()

c } c } getClassTypeId() Methods from class SoNode: c } c } setOverride(SbBool state)

c } c } isOverride() const

c } c } copy(SbBool copyConnections = FALSE) const

c } c } affectsState() const

c } c } getByName(const SbName &name)

c } c } getByName(const SbName &name, SoNodeList &list) Methods from class SoFieldContainer: c } c } setToDefaults()

c } c } hasDefaultValues() const

c } c } fieldsAreEqual(const SoFieldContainer *fc) const

c } c } copyFieldValues(const SoFieldContainer *fc, SbBool copyConnections = FALSE)

c } c } set(const char *fieldDataString)

c } c } get(SbString &fieldDataString)

c } c } getFields(SoFieldList &resultList) const

c } c } getField(const SbName &fieldName) const

c } c } getFieldName(const SoField *field, SbName &fieldName) const

c } c } isNotifyEnabled() const

c } c } enableNotify(SbBool flag) Methods from class SoBase: c } c } ref()

c } c } unref() const

c } c } unrefNoDelete() const

c } c } touch()

c } c } getTypeId() const

c } c } isOfType(SoType type) const

c } c } setName(const SbName &name)

c } c } getName() const

When traversed by an action, this node appends a transformation to the current transformation matrix so that a default size cube will surround the objects specified by its fields. Transform manipulators, such as SoHandleBoxManip, use these nodes to make themselves surround other objects. This node only recalculates after the invalidate() method has been called. Otherwise it uses a saved scale and translation. When calculating what to surround, the SoSurroundScale looks at the current path in the action and at its own field values. Then SoSurroundScale applies an SoGetBoundingBoxAction to the node that is numNodesUpToContainer nodes above it on the path. SoSurroundScale also tells the action to reset the bounding box upon traversal of the node located numNodesUpToReset nodes above it in the path. The SoSurroundScale then appends a translation and scale to the current transformation so that a default size SoCube will translate and scale to fit this bounding box. For example, when an SoHandleBoxManip wants to surround the objects it is going to move, the scene graph will look something like this:

                 RootNode
       -------------------------
       |                        |
     handleBoxManip        movingStuff
       |
     handleBoxDragger
       |
     separator
      -----------------------------------
      |            |                     |
    motionMatrix  surroundScale      cubeGeom

numNodesUpToContainer = 4; numNodesUpToReset = 3;

The SoBoundingBoxAction will then be applied to RootNode, with a reset after traversing the SoHandleBoxManip. So the SoSurroundScale will surround the objects below separator, and to the right of handleBoxManip, producing the desired effect.

c } c } numNodesUpToContainer

When traversed by an action, if surroundScale needs to calculate a new box, surroundScale looks at the current path in the action. It travels up this path a distance of numNodesUpToContainer and applies an SoGetBoundingBoxAction to the node that it finds there. c } c } numNodesUpToReset

Before applying the SoGetBoundingBoxAction (see the numNodesUpToContainer field aove) the surroundScale node travels up the path a distance of numNodesUpToReset and tells the action to reset the bounding box upon traversal of that node.

c } c } SoSurroundScale()

Creates a surround scale node with default settings. c } c } invalidate()

If you call this, then next time an action is applied the node will re-calculate it's cached translation and scale values. c } c } getClassTypeId()

Returns type identifier for this class.

SoGLRenderAction, SoCallbackAction, SoGetBoundingBoxAction, SoRayPickAction

Accumulates scaling and translation transformations into the current transformation. SoGetMatrixAction

Returns the matrix corresponding to the scaling and translation.

SurroundScale {
numNodesUpToContainer	0
numNodesUpToReset	0
}

SoTransformation, SoTransformManip, SoCenterballDragger, SoCenterballManip, SoHandleBoxDragger, SoHandleBoxManip, SoJackDragger, SoJackManip, SoTabBoxDragger, SoTabBoxManip, SoTrackballDragger, SoTrackballManip, SoTransformBoxDragger, SoTransformBoxManip