SoSurroundScale(3)

NAME
SoSurroundScale - The SoSurroundScale class is used to automatically scale geometry to surround other geometry.

SYNOPSIS

#include <Inventor/nodes/SoSurroundScale.h>

Inherits SoTransformation.

  Public Member Functions
virtual SoType getTypeId (void) const
SoSurroundScale (void)
void invalidate (void)
virtual void doAction (SoAction *action)
void setDoingTranslations (const SbBool val)
SbBool isDoingTranslations (void)
Public Member Functions inherited from SoNode
void setOverride (const SbBool state)
SbBool isOverride (void) const
void setNodeType (const NodeType type)
NodeType getNodeType (void) const
virtual SoNode * copy (SbBool copyconnections=FALSE) const
virtual SbBool affectsState (void) const
virtual void GLRenderBelowPath (SoGLRenderAction *action)
virtual void GLRenderInPath (SoGLRenderAction *action)
virtual void GLRenderOffPath (SoGLRenderAction *action)
virtual void handleEvent (SoHandleEventAction *action)
virtual void rayPick (SoRayPickAction *action)
virtual void search (SoSearchAction *action)
virtual void write (SoWriteAction *action)
virtual void audioRender (SoAudioRenderAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
virtual void grabEventsSetup (void)
virtual void grabEventsCleanup (void)
virtual void startNotify (void)
virtual void notify (SoNotList *l)
SbUniqueId getNodeId (void) const
virtual SoChildList * getChildren (void) const
virtual void writeInstance (SoOutput *out)
virtual SoNode * addToCopyDict (void) const
virtual void copyContents (const SoFieldContainer *from, SbBool copyconnections)
virtual SoFieldContainer * copyThroughConnection (void) const
Public Member Functions inherited from SoFieldContainer
void setToDefaults (void)
SbBool hasDefaultValues (void) const
SbBool fieldsAreEqual (const SoFieldContainer *container) const
void copyFieldValues (const SoFieldContainer *container, SbBool copyconnections=FALSE)
SbBool set (const char *const fielddata)
void get (SbString &fielddata)
virtual int getFields (SoFieldList &l) const
virtual int getAllFields (SoFieldList &l) const
virtual SoField * getField (const SbName &name) const
virtual SoField * getEventIn (const SbName &name) const
virtual SoField * getEventOut (const SbName &name) const
SbBool getFieldName (const SoField *const field, SbName &name) const
SbBool enableNotify (const SbBool flag)
SbBool isNotifyEnabled (void) const
SbBool set (const char *fielddata, SoInput *input)
void get (SbString &fielddata, SoOutput *out)
virtual SbBool validateNewFieldValue (SoField *field, void *newval)
virtual void addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)
SbBool getIsBuiltIn (void) const
virtual void getFieldsMemorySize (size_t &managed, size_t &unmanaged) const
void setUserData (void *userdata) const
void * getUserData (void) const
Public Member Functions inherited from SoBase
void ref (void) const
void unref (void) const
void unrefNoDelete (void) const
int32_t getRefCount (void) const
void touch (void)
SbBool isOfType (SoType type) const
Returns TRUE if the type of this object is either of the same type or inherited from type.
virtual SbName getName (void) const
virtual void setName (const SbName &newname)
void addAuditor (void *const auditor, const SoNotRec::Type type)
void removeAuditor (void *const auditor, const SoNotRec::Type type)
const SoAuditorList & getAuditors (void) const
SbBool shouldWrite (void)
void assertAlive (void) const

  Static Public Member Functions
static SoType getClassTypeId (void)
static void initClass (void)
Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
Static Public Member Functions inherited from SoTransformation
static SoType getClassTypeId (void)
static void initClass (void)
Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
Static Public Member Functions inherited from SoNode
static uint32_t getCompatibilityTypes (const SoType &nodetype)
static SoType getClassTypeId (void)
static SoNode * getByName (const SbName &name)
static int getByName (const SbName &name, SoNodeList &l)
static void initClass (void)
Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
static void initClasses (void)
static SbUniqueId getNextNodeId (void)
static int getActionMethodIndex (const SoType type)
static void getBoundingBoxS (SoAction *action, SoNode *node)
static void GLRenderS (SoAction *action, SoNode *node)
static void callbackS (SoAction *action, SoNode *node)
static void getMatrixS (SoAction *action, SoNode *node)
static void handleEventS (SoAction *action, SoNode *node)
static void pickS (SoAction *action, SoNode *node)
static void rayPickS (SoAction *action, SoNode *node)
static void searchS (SoAction *action, SoNode *node)
static void writeS (SoAction *action, SoNode *node)
static void audioRenderS (SoAction *action, SoNode *node)
static void getPrimitiveCountS (SoAction *action, SoNode *node)
Static Public Member Functions inherited from SoFieldContainer
static void initClass (void)
Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
static SoType getClassTypeId (void)
This static method returns the SoType object associated with objects of this class.
static void cleanupClass (void)
static void initCopyDict (void)
static void addCopy (const SoFieldContainer *orig, const SoFieldContainer *copy)
static SoFieldContainer * checkCopy (const SoFieldContainer *orig)
static SoFieldContainer * findCopy (const SoFieldContainer *orig, const SbBool copyconnections)
static void copyDone (void)
Static Public Member Functions inherited from SoBase
static void initClass (void)
Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
static SoType getClassTypeId (void)
This static method returns the SoType object associated with objects of this class.
static void addName (SoBase *const base, const char *const name)
static void removeName (SoBase *const base, const char *const name)
static void incrementCurrentWriteCounter (void)
static void decrementCurrentWriteCounter (void)
static SoBase * getNamedBase (const SbName &name, SoType type)
static int getNamedBases (const SbName &name, SoBaseList &baselist, SoType type)
static SbBool read (SoInput *input, SoBase *&base, SoType expectedtype)
static void setInstancePrefix (const SbString &c)
static void setTraceRefs (SbBool trace)
static SbBool getTraceRefs (void)
static SbBool connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)
static SbBool readRoute (SoInput *input)

  Public Attributes
SoSFInt32 numNodesUpToContainer
SoSFInt32 numNodesUpToReset

  Protected Member Functions
virtual const SoFieldData * getFieldData (void) const
virtual ~SoSurroundScale ()
virtual void callback (SoCallbackAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
virtual void getMatrix (SoGetMatrixAction *action)
virtual void pick (SoPickAction *action)
void updateMySurroundParams (SoAction *action, const SbMatrix &inv)
void setIgnoreInBbox (const SbBool val)
SbBool isIgnoreInBbox (void)
Protected Member Functions inherited from SoTransformation
SoTransformation (void)
virtual ~SoTransformation ()
Protected Member Functions inherited from SoNode
SoNode (void)
virtual ~SoNode ()
virtual SbBool readInstance (SoInput *in, unsigned short flags)
Protected Member Functions inherited from SoFieldContainer
SoFieldContainer (void)
virtual ~SoFieldContainer ()
Protected Member Functions inherited from SoBase
SoBase (void)
virtual ~SoBase ()
virtual void destroy (void)
SbBool hasMultipleWriteRefs (void) const
SbBool writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const
void writeFooter (SoOutput *out) const
virtual const char * getFileFormatName (void) const
virtual SoNotRec createNotRec (void)

  Static Protected Member Functions
static const SoFieldData ** getFieldDataPtr (void)
Static Protected Member Functions inherited from SoTransformation
static const SoFieldData ** getFieldDataPtr (void)
Static Protected Member Functions inherited from SoNode
static const SoFieldData ** getFieldDataPtr (void)
static void setNextActionMethodIndex (int index)
static int getNextActionMethodIndex (void)
static void incNextActionMethodIndex (void)
static void setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask)
Static Protected Member Functions inherited from SoBase
static uint32_t getCurrentWriteCounter (void)
static void staticDataLock (void)
static void staticDataUnlock (void)

  Protected Attributes
SbVec3f cachedScale
SbVec3f cachedInvScale
SbVec3f cachedTranslation
SbBool cacheOK
SbBool doTranslations
Protected Attributes inherited from SoNode
SbUniqueId uniqueId
Protected Attributes inherited from SoFieldContainer
SbBool isBuiltIn

  Additional Inherited Members
Public Types inherited from SoNode
enum NodeType { INVENTOR = 0x0000, VRML1 = 0x0001, VRML2 = 0x0002, INVENTOR_1 = 0x0004, INVENTOR_2_0 = 0x0008, INVENTOR_2_1 = 0x0010, INVENTOR_2_5 = 0x0020, INVENTOR_2_6 = 0x0040, COIN_1_0 = 0x0080, COIN_2_0 = 0x0100, EXTENSION = 0x0200, COIN_2_2 = 0x0400, COIN_2_3 = 0x0800, COIN_2_4 = 0x1000, INVENTOR_5_0 = 0x2000, COIN_2_5 = 0x4000, COIN_3_0 = 0x8000, INVENTOR_6_0 = 0x10000, COIN_4_0 = 0x20000 }
Protected Types inherited from SoBase
enum BaseFlags { IS_ENGINE = 0x01, IS_GROUP = 0x02 }
Static Protected Attributes inherited from SoNode
static SbUniqueId nextUniqueId = 1
static int nextActionMethodIndex = 0

Detailed Description

The SoSurroundScale class is used to automatically scale geometry to surround other geometry. This node calculates a transformation (a translation and a scale) which will, when the node is traversed, be appended to the current model matrix, making a default cube placed directly to the right of this node in the graph surround geometry to the right of the container branch this node is on. The container is specified by the field SoSurroundScale::numNodesUpToContainer.

When calculating the bounding box to be surrounded, the bounding box action will be applied to the container node, and the bounding box calculations will be reset after traversing the node specified by the field SoSurroundScale::numNodesUpToReset.

A way of thinking of the container node is that there exists a path from the root-node to the SoSurroundScale node. This path has a number of nodes in it. numNodesUpToContainer is the number of nodes in the path from the SoSurroundScale node towards the root node. When having counted numNodesUpToContainer from the SoSurroundScale node, you will have reached the container node. The container node is the seed-node that the bounding box is calculated from. All nodes lower than the seed-node will be a part of the bounding box unless they are closer to the SoSurroundScale node than numNodesUpToReset.

To make sure the node(s) that are to be scaled by the SoSurroundScale node aren't a part of the bounding box, the numNodesUpToReset is used. It is also the number of nodes up from the SoSurroundScale node towards the root node. The meaning of numNodesUpToReset is that nodes that are closer to the SoSurroundNode than the node at position numNodesUpToReset are not to be used for bounding box calculations.

Here's a complete, standalone example which sets up an SoTrackballDragger (connected to a cube), and uses an SoSurroundScale node to make it auto-scale to the size of the high cube and translates it an offset to one side of the cube:

#include <Inventor/Qt/SoQt.h>
#include <Inventor/Qt/viewers/SoQtExaminerViewer.h>
#include <Inventor/draggers/SoTrackballDragger.h>
#include <Inventor/nodes/SoAntiSquish.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoCube.h>
#include <Inventor/nodes/SoSurroundScale.h>
#include <Inventor/nodes/SoRotation.h>
#include <Inventor/nodes/SoTranslation.h>
int
main(int argc, char **argv)
{
  QWidget * window = SoQt::init(argv[0]);
  if (window == NULL) exit(1);
  SoSeparator * root = new SoSeparator;
  root->ref();
  SoSeparator * surroundsep = new SoSeparator;
  root->addChild(surroundsep);
  SoTranslation * translation = new SoTranslation;
  translation->translation = SbVec3f(12, 0, 0);
  surroundsep->addChild(translation);
  SoSurroundScale * ss = new SoSurroundScale;
  ss->numNodesUpToReset = 1;
  ss->numNodesUpToContainer = 2;
  surroundsep->addChild(ss);
  SoAntiSquish * antisquish = new SoAntiSquish;
  antisquish->sizing = SoAntiSquish::BIGGEST_DIMENSION;
  surroundsep->addChild(antisquish);
  SoTrackballDragger * dragger = new SoTrackballDragger;
  surroundsep->addChild(dragger);
  SoRotation * rotation = new SoRotation;
  rotation->rotation.connectFrom(& dragger->rotation);
  root->addChild(rotation);
  SoCube * cube = new SoCube;
  cube->height = 10.0f;
  root->addChild(cube);
  SoQtExaminerViewer * viewer = new SoQtExaminerViewer(window);
  viewer->setSceneGraph(root);
  viewer->setViewing(FALSE);
  viewer->setDecoration(FALSE);
  viewer->show();
  SoQt::show(window);
  SoQt::mainLoop();
  delete viewer;
  root->unref();
  return 0;
}

It might be easier to see how the SoSurroundScale node works in the above example by looking at the actual scene graph:

#Inventor V2.1 ascii
Separator {
   Separator {
      Translation {
         translation 12 0 0
      }
      SurroundScale {
         numNodesUpToContainer 2
         numNodesUpToReset 1
      }
      AntiSquish {
         sizing BIGGEST_DIMENSION
      }
      DEF mydragger TrackballDragger {
      }
   }
   Rotation {
      rotation 0 0 1  0 =
      USE mydragger . rotation
   }
   Cube {
      height 10
   }
}

This node is internally used by manipulators to make it possible for them to scale their dragger's geometry to match the scene graph geometry it is modifying, as is demonstrated above (but outside of the context of a manipulator).

It is also generally useful for application programmers who want any particular piece of geometry surround other geometry of unknown or changing extent.

SoSurroundScale nodes in the scene graph are often paired up with SoAntiSquish nodes to get uniform scaling along all three principal axes, as has also been done in the above example.

FILE FORMAT/DEFAULTS:

SurroundScale {
    numNodesUpToContainer 0
    numNodesUpToReset 0
}

See also
    SoAntiSquish

Constructor & Destructor Documentation

  SoSurroundScale::SoSurroundScale (void )
Constructor.

  SoSurroundScale::~SoSurroundScale () [protected], [virtual]
Destructor.

Member Function Documentation

  SoType SoSurroundScale::getClassTypeId (void ) [static]
This static method returns the SoType object associated with objects of this class.

  SoType SoSurroundScale::getTypeId (void ) const [virtual]
Returns the type identification of an object derived from a class inheriting SoBase. This is used for runtime type checking and "downward" casting.

Reimplemented from SoTransformation.

  const SoFieldData ** SoSurroundScale::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.
 Returns the SoFieldData class which holds information about fields in this node.

  const SoFieldData * SoSurroundScale::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.

  void SoSurroundScale::invalidate (void )
Invalidates the cached transformation, forcing a recalculation to be done the next time this node is traversed.

  void SoSurroundScale::doAction (SoAction * action) [virtual]
This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

  void SoSurroundScale::setDoingTranslations (const SbBool val)
Sets whether the translation part of the transformation should be ignored or not. Default behavior is to translate.

  SbBool SoSurroundScale::isDoingTranslations (void )
Returns whether the translation part of the transformation should be ignored or not.

See also
    setDoingTranslations()

  void SoSurroundScale::callback (SoCallbackAction * action) [protected], [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.

  void SoSurroundScale::GLRender (SoGLRenderAction * action) [protected], [virtual]
Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or want to throw geometry primitives at OpenGL override this method.

Reimplemented from SoNode.

  void SoSurroundScale::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 calculate their bounding box also override this method to change the relevant state variables.

Reimplemented from SoNode.

  void SoSurroundScale::getMatrix (SoGetMatrixAction * action) [protected], [virtual]
Action method for SoGetMatrixAction.

Updates action by accumulating with the transformation matrix of this node (if any).

Reimplemented from SoNode.

  void SoSurroundScale::pick (SoPickAction * action) [protected], [virtual]
Action method for SoPickAction.

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

  void SoSurroundScale::updateMySurroundParams (SoAction * action, const SbMatrix & inv) [protected]
Calculates the translation and scale needed to make a default cube surround geometry to the right of the branch this node is on.

  void SoSurroundScale::setIgnoreInBbox (const SbBool val) [protected]
Sets whether bounding box calculations in SoGetBoundingBoxAction should be affected by this node.

Default is to ignore our bounding box calculations.

  SbBool SoSurroundScale::isIgnoreInBbox (void ) [protected]
Returns the value of the flag that decides whether bounding box calculations in SoGetBoundingBoxAction should be affected by this node.

See also
    setIgnoreInBbox()

Member Data Documentation

  SoSFInt32 SoSurroundScale::numNodesUpToContainer
Number of nodes in the path counting from this and "upwards" to the container node.

  SoSFInt32 SoSurroundScale::numNodesUpToReset
Number of nodes in the path counting from this and "upwards" to the node where we will reset the bounding box value.

  SbVec3f SoSurroundScale::cachedScale [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

  SbVec3f SoSurroundScale::cachedInvScale [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

  SbVec3f SoSurroundScale::cachedTranslation [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

  SbBool SoSurroundScale::cacheOK [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

  SbBool SoSurroundScale::doTranslations [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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