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NAME SoSurroundScale SoSurroundScale "" { transformation node that adjusts the current matrix so a default cube will surround other objects }
INCLUDE nodes/SoSurroundScale.h
DESC {
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 \cSoHandleBoxManip\.,
use these nodes to make themselves surround other objects.
\p
This node only recalculates after the
\m\+invalidate()\.\-SoSurroundScaleInvalidate()\.\. method has been
called. Otherwise it uses a saved scale and translation.
\p
When calculating what to surround, the \cSoSurroundScale\.
looks at the current path in
the action and at its own field values.
Then \cSoSurroundScale\. applies an \cSoGetBoundingBoxAction\.
to the node that is
\vnumNodesUpToContainer\. nodes above it on the path.
\cSoSurroundScale\. also tells the action to reset
the bounding box upon traversal of the
node located \vnumNodesUpToReset\. nodes above it in the path.
The \cSoSurroundScale\. then appends a translation and scale
to the current transformation
so that a default size \cSoCube\. will translate and scale to fit this
bounding box.
\p
For example, when an \cSoHandleBoxManip\. wants to surround the objects it
is going to move, the scene graph will look something like this:
\b\k\*(Cr
RootNode
-------------------------
| |
handleBoxManip movingStuff
|
handleBoxDragger
|
separator
-----------------------------------
| | |
motionMatrix surroundScale cubeGeom
\.\.
The \cSoHandleBoxDragger\. wants to transform the \ecubeGeom\. so that it
surrounds the \emovingStuff\.. So it sets the \esurroundScale\. fields to:
\b
\vnumNodesUpToContainer\. = 4;
\vnumNodesUpToReset\. = 3;
\.
The \cSoBoundingBoxAction\. will then be applied to \eRootNode\.,
with a reset after traversing the \cSoHandleBoxManip\..
So the \cSoSurroundScale\. will surround the objects below \eseparator\., and
to the right of \ehandleBoxManip\., producing the desired effect.
}
FIELD 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 \vnumNodesUpToContainer\.
and applies an \cSoGetBoundingBoxAction\. to the node that it finds
there.
}
FIELD numNodesUpToReset {
Before applying the \cSoGetBoundingBoxAction\. (see the
\vnumNodesUpToContainer\. field aove) the surroundScale node
travels up the path a distance of \vnumNodesUpToReset\.
and tells the action to reset
the bounding box upon traversal of that node.
}
METHOD "" SoSurroundScale() {
Creates a surround scale node with default settings.
}
METHOD "" void invalidate() {
If you call this, then next time an action is applied the node will re-calculate
it's cached translation and scale values.
}
METHOD "" static SoType getClassTypeId() {
Returns type identifier for this class.
}
ACTION SoGLRenderAction, SoCallbackAction,
SoGetBoundingBoxAction, SoRayPickAction {
Accumulates scaling and translation transformations into
the current transformation.
}
ACTION SoGetMatrixAction {
Returns the matrix corresponding to the scaling and translation.
}
ALSO { SoTransformation, SoTransformManip,
SoCenterballDragger, SoCenterballManip,
SoHandleBoxDragger, SoHandleBoxManip,
SoJackDragger, SoJackManip,
SoTabBoxDragger, SoTabBoxManip,
SoTrackballDragger, SoTrackballManip,
SoTransformBoxDragger, SoTransformBoxManip
}
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