SoBaseKit (3)

#include <Inventor/nodekits/SoBaseKit.h>

Inherits SoNode.

Inherited by SoAppearanceKit, SoCameraKit, SoForeignFileKit, SoInteractionKit, SoLightKit, SoNodeVisualize, SoProfilerOverlayKit, SoSceneKit, and SoSeparatorKit.

Public Member Functions

virtual SoType getTypeId (void) const

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting. SoBaseKit (void)

virtual const SoNodekitCatalog * getNodekitCatalog (void) const

virtual SoNode * getPart (const SbName &partname, SbBool makeifneeded)

SbString getPartString (const SoBase *part)

virtual SoNodeKitPath * createPathToPart (const SbName &partname, SbBool makeifneeded, const SoPath *pathtoextend=NULL)

virtual SbBool setPart (const SbName &partname, SoNode *from)

SbBool set (const char *namevaluepairliststring)

SbBool set (const char *partnamestring, const char *parameterstring)

virtual void doAction (SoAction *action)

virtual void callback (SoCallbackAction *action)

virtual void GLRender (SoGLRenderAction *action)

virtual void getBoundingBox (SoGetBoundingBoxAction *action)

virtual void getMatrix (SoGetMatrixAction *action)

virtual void handleEvent (SoHandleEventAction *action)

virtual void rayPick (SoRayPickAction *action)

virtual void search (SoSearchAction *action)

virtual void write (SoWriteAction *action)

virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)

virtual SoChildList * getChildren (void) const

void printDiagram (void)

void printSubDiagram (const SbName &rootname, int level)

void printTable (void)

virtual void addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)

SbBool forceChildDrivenWriteRefs (SoOutput *out)

Static Public Member Functions

static SoType getClassTypeId (void)

static void initClass (void)

static const SoNodekitCatalog * getClassNodekitCatalog (void)

static SbBool isSearchingChildren (void)

static void setSearchingChildren (const SbBool newval)

Protected Member Functions

virtual const SoFieldData * getFieldData (void) const

virtual ~SoBaseKit ()

virtual SoNode * addToCopyDict (void) const

virtual void copyContents (const SoFieldContainer *fromfc, SbBool copyconnections)

SoGroup * getContainerNode (const SbName &listname, SbBool makeifneeded=TRUE)

virtual SoNode * getAnyPart (const SbName &partname, SbBool makeifneeded, SbBool leafcheck=FALSE, SbBool publiccheck=FALSE)

virtual SoNodeKitPath * createPathToAnyPart (const SbName &partname, SbBool makeifneeded, SbBool leafcheck=FALSE, SbBool publiccheck=FALSE, const SoPath *pathtoextend=NULL)

virtual SbBool setAnyPart (const SbName &partname, SoNode *from, SbBool anypart=TRUE)

void createNodekitPartsList (void)

void createFieldList (void)

virtual void createDefaultParts (void)

const SoNodekitParts * getNodekitPartsList (void) const

const SbList< SoSFNode * > & getCatalogInstances (void) const

void catalogError (void)

virtual SbBool setUpConnections (SbBool onoff, SbBool doitalways=FALSE)

virtual SbBool readInstance (SoInput *in, unsigned short flags)

virtual void setDefaultOnNonWritingFields (void)

void countMyFields (SoOutput *out)

virtual SbBool setPart (const int partNum, SoNode *node)

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

static const SoNodekitCatalog ** getClassNodekitCatalogPtr (void)

Protected Attributes

SoSFNode callbackList

SoChildList * children

SbBool connectionsSetUp

Additional Inherited Members

The SoBaseKit class is the toplevel superclass for nodekits.

Node kits are collections of nodes and other node kits (from here on node kits which are part of some other node kit, will only be referred to as nodes or parts, see catalogs and parts), organized in a way that is convenient for its use. A node kit inherits SoNode and can thus be inserted into a scenegraph as any other node.

The organizing of the nodes and node kits of some node kit, is done through catalogs. A node kit's catalog describes the nodes that can be members of the node kit. These members are called parts. Thus a node kit has a catalog describing the parts that it offers to the user.

Each part in the catalog has some values saying something about the part itself and about the role the part plays in the scenegraph. Those values are:

Name

The name of the part.

Type

The part's node type.

Default Type

If the part's type is an abstract superclass, this value will hold the default subclass used by this part.

Created by Default?

Holds TRUE if the part should be instantiated when the node kit is instantiated, otherwise the part is kept empty until it is set by some of the means applicable.

Parent Name

The name of the part that is this part's parent.

Right Sibling

The name of the part that is the part immediately to the right of this part in the node kit scenegraph.

Is it a List?

Holds TRUE if the part is a list, otherwise it is FALSE. See SoNodeKitListPart for more info on node kit lists.

List Cointainer Type

The type of group node used to hold the items if the part is a list.

List Element Type

The types of nodes that is allowed to be held by this part if the part is a list.

Is It Public?

Holds TRUE if the part should be publically available, otherwise it holds FALSE.

Node kits use lazy instantiation when it creates it's parts. This means that the nodes making up the parts of the nodekit only are created when they are needed. If the 'Created by Default?' holds TRUE, then the part is created when the node kit itself is instantiated. If not, parts are created when they are requested through SoBaseKit::getPart() or the SO_GET_PART() macro, or created with SoBaseKit::set(). Also, if a part is set with SoBaseKit::setPart() or the SO_SET_PART() macro, any previously uncreated parts above the set part in the hierarchy, is created automatically.

The advantages of using node kits to represent a scenegraph are many.

• Since a node kit collects nodes into a single unit, it becomes an extra abstraction layer for the application programmer. Such a layer can represent a model of a human being as one unit where subunits as arms, legs, textures, etc are contained within. Thus we can instantiate a model of a human by creating an instance of the node kit, instead of having to create a possibly large amount of nodes needed for such a model.

• A part of the node kit doesn't have one specific setup. A shape part can e.g. be swapped with any other shape, since they are of the same type. If the node kit of a human has a part called 'head' which is of type SoShape, it might default to a sphere. But if the programmer thinks that a cube might fit better, one can set the 'head' part to a cube instead, or maybe a face set representing a complex model of a head.

• Node kits can have as simple or as complex catalogs as needed. The nodes included in the node kit can, if needed, represent the whole range of Inventor features. One part can as easily be of a node kit type, making it possible to create hierarchies of node kits. Having a node kit of a human, it might be feasible to have sub node kits describing the different body parts.

• Node kits are an efficient way of creating scenegraphs. If some part of it isn't needed at the moment of node kit instantiation, they aren't created. Thus parts are only created when needed, either by the application or some other part.

• The application code becomes smaller and easier to read, as the node kits provides simple routines for creating and setting parts.

• New node kits can be created through subclassing to obtain simple setups of scenegraphs best fitted to the application.

The usage of a node kit is straightforward. Below follows a code example showing some simple SoShapeKit usage.

#include <Inventor/Qt/SoQt.h>
#include <Inventor/Qt/viewers/SoQtExaminerViewer.h>
#include <Inventor/nodekits/SoShapeKit.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoCube.h>

int
main(int argc, char ** argv)
{
  QWidget * window = SoQt::init(argv[0]);

  SoQtExaminerViewer * viewer = new SoQtExaminerViewer(window);

  // Instantiating a shape kit, by default creating a simple sphere.
  SoShapeKit * shapekit = new SoShapeKit;
  // Swapping the sphere with a cube.
  shapekit->setPart("shape", new SoCube);
  // Setting the cube to be rendered in the color red. The shape kit
  // has a SoAppearanceKit as one of it's parts. The "material" part
  // used to set the color of the shape, really belongs the
  // appearance kit. If the SoShapeKit::set() is used, it will
  // check if some of its sub kits has a part with the name given,
  // and delegate the setting to the correct kit.
  shapekit->set("material", "diffuseColor 1 0 0");

  SoSeparator * newroot = new SoSeparator;
  newroot->ref();

  newroot->addChild(shapekit);

  viewer->setSceneGraph(newroot);

  viewer->show();
  SoQt::show(window);

  SoQt::mainLoop();
  delete viewer;

  newroot->unref();
  return 0;
}

The above code snippet will produce a viewer with a side view to the scene shown below:

Notice that the code needed for creating this simple shape using a shape kit, amounts to this:

SoShapeKit * shapekit = new SoShapeKit;

shapekit->setPart("shape", new SoCube);
shapekit->set("material", "diffuseColor 1 0 0");

..while doing it without shape kits amounts to this:

SoSeparator * root = new SoSeparator;
SoMaterial * material = new SoMaterial;
material->diffuseColor.setValue(1,0,0);
root->addChild(material);
root->addChild(new SoCube);

..so even for this miniscule mock-up example, you save on code verbosity and complexity.

For extending the Coin library with your own classes, we strongly recommend that you make yourself acquainted with the excellent «The Inventor Toolmaker» book (ISBN 0-201-62493-1), which describes the tasks involved in detail. This book was written by the original SGI Inventor designers and explains many of the underlying design ideas, aswell as having lots of hands-on examples on how to extend the Coin toolkit in ways that are true to the fundamental design ideas. («The Inventor Toolmaker» is also available at SGI's online library, at no cost. See Download The Inventor Toolmaker.) Reading the sourcecode of the built-in classes in Coin should also provide very helpful.

Following is a complete example of a node kit extension. The node kit is a kit which automatically scales a shape so it will be the same size in screen-pixels, no matter which distance it is from the camera. This is useful for marker graphics. The shape defaults to a cube, but can be set by the programmer to any shape or scene sub-graph.

The header file:

// Copyright (C) Kongsberg Oil & Gas Technologies. All rights reserved.

#ifndef COIN_SHAPESCALE_H
#define COIN_SHAPESCALE_H
#include <Inventor/nodekits/SoSubKit.h>
#include <Inventor/nodekits/SoBaseKit.h>
#include <Inventor/fields/SoSFFloat.h>

class SbViewport;
class SoState;
class SbColor;
class SbVec2s;

class ShapeScale : public SoBaseKit {
  typedef SoBaseKit inherited;

  SO_KIT_HEADER(ShapeScale);

  SO_KIT_CATALOG_ENTRY_HEADER(topSeparator);
  SO_KIT_CATALOG_ENTRY_HEADER(scale);
  SO_KIT_CATALOG_ENTRY_HEADER(shape);

 public:
  ShapeScale(void);
  static void initClass(void);

  SoSFFloat active;
  SoSFFloat projectedSize;

 protected:
  virtual void GLRender(SoGLRenderAction * action);
  virtual ~ShapeScale();
};

#endif // ! SHAPESCALE_H

The source code for the example:

// Copyright (C) Kongsberg Oil & Gas Technologies. All rights reserved.

//  The ShapeScale class is used for scaling a shape based on
//  projected size.
//
//  This nodekit can be inserted in your scene graph to add for
//  instance 3D markers that will be of a constant projected size.
//
//  The marker shape is stored in the "shape" part. Any kind of node
//  can be used, even group nodes with several shapes, but the
//  marker shape should be approximately of unit size, and with a
//  center position in (0, 0, 0).


//  SoSFFloat ShapeScale::active
//  Turns the scaling on/off. Default value is TRUE.


//  SoSFFloat ShapeScale::projectedSize
//  The requested projected size of the shape. Default value is 5.0.

#include "ShapeScale.h"

#include <Inventor/actions/SoGLRenderAction.h>
#include <Inventor/nodes/SoShape.h>
#include <Inventor/nodes/SoScale.h>
#include <Inventor/nodes/SoCube.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/elements/SoViewVolumeElement.h>
#include <Inventor/elements/SoViewportRegionElement.h>
#include <Inventor/elements/SoModelMatrixElement.h>

SO_KIT_SOURCE(ShapeScale);


//  Constructor.
ShapeScale::ShapeScale(void)
{
  SO_KIT_CONSTRUCTOR(ShapeScale);

  SO_KIT_ADD_FIELD(active, (TRUE));
  SO_KIT_ADD_FIELD(projectedSize, (5.0f));

  SO_KIT_ADD_CATALOG_ENTRY(topSeparator, SoSeparator, FALSE, this, \x0, FALSE);
  SO_KIT_ADD_CATALOG_ABSTRACT_ENTRY(shape, SoNode, SoCube, TRUE, topSeparator, \x0, TRUE);
  SO_KIT_ADD_CATALOG_ENTRY(scale, SoScale, FALSE, topSeparator, shape, FALSE);

  SO_KIT_INIT_INSTANCE();
}


// Destructor.
ShapeScale::~ShapeScale()
{
}

// Initializes this class. Call before using it.

void
ShapeScale::initClass(void)
{
  SO_KIT_INIT_CLASS(ShapeScale, SoBaseKit, "BaseKit");
}

static void
update_scale(SoScale * scale, const SbVec3f & v)
{
  // only write to field when scaling has changed.
  if (scale->scaleFactor.getValue() != v) {
    scale->scaleFactor = v;
  }
}

// Overridden to (re)initialize scaling before rendering marker.
void
ShapeScale::GLRender(SoGLRenderAction * action)
{
  SoState * state = action->getState();

  SoScale * scale = (SoScale*) this->getAnyPart(SbName("scale"), TRUE);
  if (!this->active.getValue()) {
    update_scale(scale, SbVec3f(1.0f, 1.0f, 1.0f));
  }
  else {
    const SbViewportRegion & vp = SoViewportRegionElement::get(state);
    const SbViewVolume & vv = SoViewVolumeElement::get(state);
    SbVec3f center(0.0f, 0.0f, 0.0f);
    float nsize = this->projectedSize.getValue() / float(vp.getViewportSizePixels()[1]);
    SoModelMatrixElement::get(state).multVecMatrix(center, center); // transform to WCS
    float scalefactor = vv.getWorldToScreenScale(center, nsize);
    update_scale(scale, SbVec3f(scalefactor, scalefactor, scalefactor));
  }
  inherited::GLRender(action);
}

And a complete example showing how one can use this node kit:

// Copyright (C) Kongsberg Oil & Gas Technologies. All rights reserved.

#include <Inventor/Qt/SoQt.h>
#include <Inventor/Qt/viewers/SoQtExaminerViewer.h>
#include <Inventor/SoInput.h>
#include <Inventor/SoOutput.h>
#include <Inventor/SoPickedPoint.h>
#include <Inventor/actions/SoRayPickAction.h>
#include <Inventor/events/SoMouseButtonEvent.h>
#include <Inventor/nodes/SoBaseColor.h>
#include <Inventor/nodes/SoCube.h>
#include <Inventor/nodes/SoEventCallback.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoSwitch.h>
#include <Inventor/nodes/SoTranslation.h>
#include <assert.h>
#include <stdlib.h>
#include <time.h>

#include "ShapeScale.h"

// Returns random value between 0.0f and 1.0f.
static float
normalized_rand(void)
{
  return float(rand())/float(RAND_MAX);
}

static SoSeparator *
construct_new_marker(const SbVec3f & v)
{
  SoSeparator * markerroot = new SoSeparator;

  SoTranslation * t = new SoTranslation;
  t->translation = v;
  markerroot->addChild(t);

  ShapeScale * kit = new ShapeScale;
  kit->active = TRUE;
  kit->projectedSize = 5.0f;

  // create the marker
  SoSeparator * markersep = new SoSeparator;

  SoBaseColor * mat = new SoBaseColor;
  mat->rgb.setValue(normalized_rand(), normalized_rand(), normalized_rand());
  markersep->addChild(mat);

  // marker shape should be unit size, with center in (0.0f, 0.0f, 0.0f)
  SoCube * cube = new SoCube;
  cube->width = 1.0f;
  cube->height = 1.0f;
  cube->depth = 1.0f;

  markersep->addChild(cube);
  kit->setPart("shape", markersep);
  markerroot->addChild(kit);

  return markerroot;
}

static void
event_cb(void * ud, SoEventCallback * n)
{
  const SoMouseButtonEvent * mbe = (SoMouseButtonEvent *)n->getEvent();

  if (mbe->getButton() == SoMouseButtonEvent::BUTTON1 &&
    mbe->getState() == SoButtonEvent::DOWN) {

    SoQtExaminerViewer * viewer = (SoQtExaminerViewer *)ud;

    SoRayPickAction rp(viewer->getViewportRegion());
    rp.setPoint(mbe->getPosition());
    rp.apply(viewer->getSceneManager()->getSceneGraph());

    SoPickedPoint * point = rp.getPickedPoint();
    if (point == NULL) {
      (void)fprintf(stderr, "\n** miss! **\n\n");
      return;
    }

    n->setHandled();

    const SoPath * p = rp.getCurPath();

    for (int i = 0; i < p->getLength(); i++) {
      SoNode * n = p->getNodeFromTail(i);
      if (n->isOfType(SoGroup::getClassTypeId())) {
        SoGroup * g = (SoGroup *)n;
        g->addChild(construct_new_marker(point->getPoint()));
        break;
      }
    }
  }
}

void
show_instructions(void)
{
  (void)fprintf(stdout,
    "\nThis example program demonstrates the use of the ShapeScale nodekit.\n"
    "\nQuick instructions:\n\n"
    "  * place the marker by clicking on a shape with the left mouse button\n"
    "  * hit ESC to toggle back and forth to view mode\n"
    "  * zoom back and forth to see how the markers stay the same size\n\n");
}

int
main(int argc, char ** argv)
{
  if (argc != 2) {
    (void) fprintf(stderr,"\nSpecify an Inventor file as argument.\n");
    return -1;
  }

  QWidget * window = SoQt::init(argv[0]);
  ShapeScale::initClass(); // init our extension nodekit

  SoQtExaminerViewer * ex1 = new SoQtExaminerViewer(window);

  SoInput input;
  SbBool ok = input.openFile(argv[1]);
  if (!ok) {
    (void) fprintf(stderr, "Unable to open file: %s\n", argv[1]);
    return -1;
  }

  SoSeparator * root = SoDB::readAll(&input);

  if (root == NULL) {
    (void) fprintf(stderr, "Unable to read file: %s\n", argv[1]);
    return -1;
  }

  show_instructions();

  SoSeparator * newroot = new SoSeparator;
  newroot->ref();

  newroot->addChild(root);

  // create event callback and marker nodes
  SoSeparator * sep = new SoSeparator;
  newroot->addChild(sep);

  SoEventCallback * ecb = new SoEventCallback;
  ecb->addEventCallback(SoMouseButtonEvent::getClassTypeId(), event_cb, ex1);
  sep->addChild(ecb);

  ex1->setSceneGraph(newroot);
  ex1->setTransparencyType(SoGLRenderAction::SORTED_OBJECT_BLEND);
  ex1->setViewing(FALSE);

  ex1->show();
  SoQt::show(window);

  SoQt::mainLoop();
  delete ex1;

  newroot->unref();
  return 0;
}

SoBaseKit::SoBaseKit (void)

Constructor.

This is the top-level superclass of all node kit and dragger classes. The catalog structure of SoBaseKit is as follows:

CLASS SoBaseKit
-->"this"
-->   "callbackList"

(See SoBaseKit::printDiagram() for information about the output formatting.)

Detailed information on catalog parts:

CLASS SoBaseKit
PVT   "this",  SoBaseKit  ---
      "callbackList",  SoNodeKitListPart [ SoCallback, SoEventCallback ]

(See SoBaseKit::printTable() for information about the output formatting.)

As can be seen from the catalog, all node kits can have a callback node in front of all other nodes in the kit. This is handy for catching events that should go to application processing.

SoBaseKit::~SoBaseKit ()\fC [protected]\fP, \fC [virtual]\fP

Destructor.

\fBSoType\fP SoBaseKit::getTypeId (void) const\fC [virtual]\fP

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
  }
}

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.

Implements SoBase.

Reimplemented in SoDragger, SoTrackballDragger, SoInteractionKit, SoSTLFileKit, SoRotateSphericalDragger, SoSpotLightDragger, SoTransformerDragger, SoHandleBoxDragger, SoScale2UniformDragger, SoTabPlaneDragger, SoTranslate1Dragger, SoTranslate2Dragger, SoForeignFileKit, SoCenterballDragger, SoDirectionalLightDragger, SoJackDragger, SoRotateCylindricalDragger, SoRotateDiscDragger, SoScale1Dragger, SoScale2Dragger, SoScaleUniformDragger, SoTransformBoxDragger, SoDragPointDragger, SoPointLightDragger, SoTabBoxDragger, SoSeparatorKit, SoAppearanceKit, SoCameraKit, SoLightKit, SoSceneKit, SoShapeKit, and SoWrapperKit.

const \fBSoFieldData\fP * SoBaseKit::getFieldData (void) const\fC [protected]\fP, \fC [virtual]\fP

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoFieldContainer.

Reimplemented in SoDragger, SoTrackballDragger, SoInteractionKit, SoSTLFileKit, SoRotateSphericalDragger, SoSpotLightDragger, SoTransformerDragger, SoHandleBoxDragger, SoScale2UniformDragger, SoTabPlaneDragger, SoTranslate1Dragger, SoTranslate2Dragger, SoForeignFileKit, SoCenterballDragger, SoDirectionalLightDragger, SoJackDragger, SoRotateCylindricalDragger, SoRotateDiscDragger, SoScale1Dragger, SoScale2Dragger, SoScaleUniformDragger, SoTransformBoxDragger, SoDragPointDragger, SoPointLightDragger, SoTabBoxDragger, SoSeparatorKit, SoAppearanceKit, SoCameraKit, SoLightKit, SoSceneKit, SoShapeKit, and SoWrapperKit.

const \fBSoNodekitCatalog\fP * SoBaseKit::getClassNodekitCatalog (void)\fC [static]\fP

Returns the nodekit catalog which defines the layout of this class' kit.

const \fBSoNodekitCatalog\fP * SoBaseKit::getNodekitCatalog (void) const\fC [virtual]\fP

Returns the nodekit catalog which defines the layout of this class' kit.

Reimplemented in SoDragger, SoTrackballDragger, SoInteractionKit, SoSTLFileKit, SoRotateSphericalDragger, SoSpotLightDragger, SoTransformerDragger, SoHandleBoxDragger, SoScale2UniformDragger, SoTabPlaneDragger, SoTranslate1Dragger, SoTranslate2Dragger, SoForeignFileKit, SoCenterballDragger, SoDirectionalLightDragger, SoJackDragger, SoRotateCylindricalDragger, SoRotateDiscDragger, SoScale1Dragger, SoScale2Dragger, SoScaleUniformDragger, SoTransformBoxDragger, SoDragPointDragger, SoPointLightDragger, SoTabBoxDragger, SoSeparatorKit, SoAppearanceKit, SoCameraKit, SoLightKit, SoSceneKit, SoShapeKit, and SoWrapperKit.

\fBSoNode\fP * SoBaseKit::getPart (const \fBSbName\fP &partname, SbBoolmakeifneeded)\fC [virtual]\fP

Returns a pointer to the node part with partname.

This method calls SoBaseKit::getAnyPart() with leafcheck and publiccheck both set to TRUE.

See the documentation of SoBaseKit::getAnyPart() for information on how to use partname and makeifneeded, and what you can expect to get returned from this method.

\fBSbString\fP SoBaseKit::getPartString (const \fBSoBase\fP *part)

Returns the full path name to a catalog part, given the part's current item pointer.

\fBSoNodeKitPath\fP * SoBaseKit::createPathToPart (const \fBSbName\fP &partname, SbBoolmakeifneeded, const \fBSoPath\fP *pathtoextend = \fCNULL\fP)\fC [virtual]\fP

Calls SoBaseKit::createPathToAnyPart() with leafcheck TRUE, and publiccheck TRUE (and other arguments as given to this function).

See SoBaseKit::createPathToAnyPart() for documentation.

SbBool SoBaseKit::setPart (const \fBSbName\fP &partname, \fBSoNode\fP *from)\fC [virtual]\fP

Sets the catalog part given by partname to the from node pointer.

Reimplemented in SoInteractionKit.

SbBool SoBaseKit::set (const char *namevaluepairliststring)

Sets nodekit part field values. The input argument string is of the format:

partname {
  fieldname fieldval
  fieldname fieldval
  [...]
}
partname {
  fieldname fieldval
  fieldname fieldval
  [...]
}
[...]

(Whitespace layout is ignored, as always for Inventor format input strings.)

Here's an example, changing several values of the camera part of an SoCameraKit instance:

kit->set("camera { heightAngle 0.3927  nearDistance 1.1  farDistance 999.9 }");

SbBool SoBaseKit::set (const char *partnamestring, const char *parameterstring)

This just overloads the other SoBaseKit::set() method, and provides a way to set a part value by using a separate input argument for the name of the part and the name of the field (i.e. parameter) settings.

void SoBaseKit::doAction (\fBSoAction\fP *action)\fC [virtual]\fP

This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

void SoBaseKit::callback (\fBSoCallbackAction\fP *action)\fC [virtual]\fP

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 SoDragger.

void SoBaseKit::GLRender (\fBSoGLRenderAction\fP *action)\fC [virtual]\fP

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 SoTabPlaneDragger, and SoDragger.

void SoBaseKit::getBoundingBox (\fBSoGetBoundingBoxAction\fP *action)\fC [virtual]\fP

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 SoDragger, and SoCenterballDragger.

void SoBaseKit::getMatrix (\fBSoGetMatrixAction\fP *action)\fC [virtual]\fP

Action method for SoGetMatrixAction.

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

Reimplemented from SoNode.

Reimplemented in SoCenterballDragger, and SoDragger.

void SoBaseKit::handleEvent (\fBSoHandleEventAction\fP *action)\fC [virtual]\fP

Action method for SoHandleEventAction.

Inspects the event data from action, and processes it if it is something which this node should react to.

Nodes influencing relevant state variables for how event handling is done also overrides this method.

Reimplemented from SoNode.

Reimplemented in SoDragger.

void SoBaseKit::rayPick (\fBSoRayPickAction\fP *action)\fC [virtual]\fP

Action method for SoRayPickAction.

Checks the ray specification of the action and tests for intersection with the data of the node.

Nodes influencing relevant state variables for how picking is done also overrides this method.

Reimplemented from SoNode.

Reimplemented in SoDragger.

void SoBaseKit::search (\fBSoSearchAction\fP *action)\fC [virtual]\fP

Action method for SoSearchAction.

Compares the search criteria from the action to see if this node is a match. Searching is done by matching up all criteria set up in the SoSearchAction -- if any of the requested criteria is a miss, the search is not deemed successful for the node.

See also:

SoSearchAction

Reimplemented from SoNode.

Reimplemented in SoDragger.

void SoBaseKit::write (\fBSoWriteAction\fP *action)\fC [virtual]\fP

Action method for SoWriteAction.

Writes out a node object, and any connected nodes, engines etc, if necessary.

Reimplemented from SoNode.

Reimplemented in SoDragger.

void SoBaseKit::getPrimitiveCount (\fBSoGetPrimitiveCountAction\fP *action)\fC [virtual]\fP

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.

Reimplemented in SoDragger.

\fBSoChildList\fP * SoBaseKit::getChildren (void) const\fC [virtual]\fP

Returns list of children for this node.

Reimplemented from SoNode.

void SoBaseKit::printDiagram (void)

Print out the full nodekit catalog structure. Just invokes SoBaseKit::printSubDiagram() on the catalog root. Useful for debugging.

Example output:

CLASS SoWrapperKit
-->"this"
      "callbackList"
      "topSeparator"
         "pickStyle"
         "appearance"
         "units"
         "transform"
         "texture2Transform"
         "childList"
-->      "localTransform"
-->      "contents"

The arrows denote new entries in the catalog for the particular class versus it's superclass. (Apart from the root entry, of course.)

For a more detailed catalog dump, see SoBaseKit::printTable().

void SoBaseKit::printSubDiagram (const \fBSbName\fP &rootname, intlevel)

Print out the nodekit catalog structure from rootname and downwards in the catalog tree, with indentation starting at level.

See also:

printDiagram()

void SoBaseKit::printTable (void)

Write the complete nodekit catalog in table form.

Example output:

CLASS SoWrapperKit
PVT   "this",  SoWrapperKit  ---
      "callbackList",  SoNodeKitListPart [ SoCallback, SoEventCallback ]
PVT   "topSeparator",  SoSeparator  ---
      "pickStyle",  SoPickStyle  ---
      "appearance",  SoAppearanceKit  ---
      "units",  SoUnits  ---
      "transform",  SoTransform  ---
      "texture2Transform",  SoTexture2Transform  ---
      "childList",  SoNodeKitListPart [ SoShapeKit, SoSeparatorKit ]
      "localTransform",  SoTransform  ---
      "contents",  SoSeparator  ---

PVT denotes that it's a private entry in the catalog, then follows the part name and the part type. If the part is a list, the allowed node types for the list is given in square brackets, and if not there's a triple hyphen. If the part type is abstract, the default part type will be listed last (not shown in the example output above).

void SoBaseKit::addWriteReference (\fBSoOutput\fP *out, SbBoolisfromfield = \fCFALSE\fP)\fC [virtual]\fP

This method is used during the first write pass of a write action to count the number of references to this object in the scene graph.

Reimplemented from SoFieldContainer.

SbBool SoBaseKit::forceChildDrivenWriteRefs (\fBSoOutput\fP *out)

Returns TRUE if kit should write. This happens if shouldWrite() returns TRUE, or if any of the children (recursively) should write.

SbBool SoBaseKit::isSearchingChildren (void)\fC [static]\fP

Returns the value of the flag indicating whether or not the kit parts are searched during SoSearchAction traversal.

See also:

SoBaseKit::setSearchingChildren()

void SoBaseKit::setSearchingChildren (const SbBoolnewval)\fC [static]\fP

Set whether or not the kit parts should be searched during SoSearchAction traversal. The default value is FALSE.

const \fBSoNodekitCatalog\fP ** SoBaseKit::getClassNodekitCatalogPtr (void)\fC [static]\fP, \fC [protected]\fP

Returns the pointer to the pointer of the nodekit catalog for this class.

\fBSoNode\fP * SoBaseKit::addToCopyDict (void) const\fC [protected]\fP, \fC [virtual]\fP

Add a copy of this node and (recursively) all children to the copy dictionary of SoFieldContainer if this has not already been done.

Used internally during copy operations.

Reimplemented from SoNode.

void SoBaseKit::copyContents (const \fBSoFieldContainer\fP *from, SbBoolcopyconnections)\fC [protected]\fP, \fC [virtual]\fP

Makes a deep copy of all data of from into this instance, except external scenegraph references if copyconnections is FALSE.

This is the method that should be overridden by extension node / engine / dragger / whatever subclasses which needs to account for internal data that are not handled automatically.

For copying nodes from application code, you should not invoke this function directly, but rather call the SoNode::copy() function:

SoNode * mynewnode = templatenode->copy();

The same also goes for engines.

Make sure that when you override the copyContents() method in your extension class that you also make it call upwards to it's parent superclass in the inheritance hierarchy, as copyContents() in for instance SoNode and SoFieldContainer does important work. It should go something like this:

void
MyCoinExtensionNode::copyContents(const SoFieldContainer * from,
                                  SbBool copyconnections)
{
  // let parent superclasses do their thing (copy fields, copy
  // instance name, etc etc)
  SoNode::copyContents(from, copyconnections);

  // [..then copy internal data..]
}

Reimplemented from SoNode.

Reimplemented in SoInteractionKit, SoRotateSphericalDragger, and SoRotateCylindricalDragger.

\fBSoGroup\fP * SoBaseKit::getContainerNode (const \fBSbName\fP &listname, SbBoolmakeifneeded = \fCTRUE\fP)\fC [protected]\fP

Returns a pointer to the group node above an SoNodeKitListPart in the catalog given by listname.

If the list part (and its container) was not yet constructed, they will be so if makeifneeded is TRUE (otherwise, NULL will be returned).

\fBSoNode\fP * SoBaseKit::getAnyPart (const \fBSbName\fP &partname, SbBoolmakeifneeded, SbBoolleafcheck = \fCFALSE\fP, SbBoolpubliccheck = \fCFALSE\fP)\fC [protected]\fP, \fC [virtual]\fP

Returns catalog part of the given partname.

If the partname part is not in the nodekit's catalog, return NULL.

If the part is specified in the catalog, but has not yet been made, the function will either construct the part (if makeifneeded is TRUE) or just return NULL (if makeifneeded is FALSE).

If leafcheck is TRUE, a pointer to the part will only be returned if it's a leaf in the catalog (otherwise NULL is returned).

If publiccheck is TRUE, a pointer to the part will only be returned if it's a public catalog part (otherwise NULL is returned).

The partname input argument should be given as a 'path' of catalog part names down to the wanted leaf part. The syntax for specifiying partname 'paths' is as follows (given in Backus-Naur Form (BNF)):

BNF:

partname = singlename | compoundname
compoundname = singlename | compoundname.singlename
singlename = singlepartname | singlelistelementname
singlelistelementname = singlelistname[idx]

singlepartname is name of a part ("ordinary", nodekit or list)
singlelistname is name of a part which is a list
idx is an integer value

\fBSoNodeKitPath\fP * SoBaseKit::createPathToAnyPart (const \fBSbName\fP &partname, SbBoolmakeifneeded, SbBoolleafcheck = \fCFALSE\fP, SbBoolpubliccheck = \fCFALSE\fP, const \fBSoPath\fP *pathtoextend = \fCNULL\fP)\fC [protected]\fP, \fC [virtual]\fP

Return path with nested SoNodeKit instances down in the catalog hierarchy given by partname.

If the trailing part has not been made and makeifneeded is TRUE, make an instance of the part type and insert into the catalog, as done in setAnyPart().

If leafcheck is TRUE, ignore non-leaf catalog node entries. If publiccheck is TRUE, ignore private catalog entries.

pathtoextend is a path through the nodekit instance catalog hierarchy, where we should pick up and continue to create the path from where pathtoextend terminates. If pathtoextend is NULL, we simply start at the 'this' toplevel node.

Returns NULL on failure, for any of the possible reasons described above (part ends in non-leaf or private catalog entry, part is not syntactically valid or refers to non-existing catalog entries).

SbBool SoBaseKit::setAnyPart (const \fBSbName\fP &partname, \fBSoNode\fP *from, SbBoolanypart = \fCTRUE\fP)\fC [protected]\fP, \fC [virtual]\fP

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoBaseKit::createNodekitPartsList (void)\fC [protected]\fP

Not part of the Coin API.

It is supposed to create the SoNodekitParts class instance. Since this class can only be used by SoBaseKit (all members are private, with SoBaseKit as friend), we decided to not support this class, and solve the problem of recording which parts are created in an alternative way.

void SoBaseKit::createFieldList (void)\fC [protected]\fP

Replaces the createNodekitPartsList() method.

Sets up the list of SoSFNode fields with node pointers to the instances in our catalog.

void SoBaseKit::createDefaultParts (void)\fC [protected]\fP, \fC [virtual]\fP

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

const SoNodekitParts * SoBaseKit::getNodekitPartsList (void) const\fC [protected]\fP

In Open Inventor, this method returns a pointer to a private class. It will always return NULL in Coin.

See also:

createNodekitPartsList()

const \fBSbList\fP< \fBSoSFNode\fP * > & SoBaseKit::getCatalogInstances (void) const\fC [protected]\fP

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoBaseKit::catalogError (void)\fC [protected]\fP

Obsoleted from the API in Coin.

SbBool SoBaseKit::setUpConnections (SbBoolonoff, SbBooldoitalways = \fCFALSE\fP)\fC [protected]\fP, \fC [virtual]\fP

Sets up all internal connections for instances of this class.

(This method will usually not be of interest to the application programmer, unless you want to extend the library with new custom nodekits or dragger classes. If so, see the SoBaseKit class documentation.)

Reimplemented in SoTransformerDragger, SoHandleBoxDragger, SoInteractionKit, SoDragPointDragger, SoTransformBoxDragger, SoTrackballDragger, SoCenterballDragger, SoTabPlaneDragger, SoTabBoxDragger, SoSpotLightDragger, SoSeparatorKit, SoTranslate2Dragger, SoRotateSphericalDragger, SoRotateCylindricalDragger, SoTranslate1Dragger, SoDirectionalLightDragger, SoJackDragger, SoScale2UniformDragger, SoRotateDiscDragger, SoScale1Dragger, SoScale2Dragger, SoScaleUniformDragger, and SoPointLightDragger.

SbBool SoBaseKit::readInstance (\fBSoInput\fP *in, unsigned shortflags)\fC [protected]\fP, \fC [virtual]\fP

This method is mainly intended for internal use during file import operations.

It reads a definition of an instance from the input stream in. The input stream state points to the start of a serialized / persistant representation of an instance of this class type.

TRUE or FALSE is returned, depending on if the instantiation and configuration of the new object of this class type went ok or not. The import process should be robust and handle corrupted input streams by returning FALSE.

flags is used internally during binary import when reading user extension nodes, group nodes or engines.

Reimplemented from SoNode.

Reimplemented in SoInteractionKit.

void SoBaseKit::setDefaultOnNonWritingFields (void)\fC [protected]\fP, \fC [virtual]\fP

(Be aware that this method is unlikely to be of interest to the application programmer who does not want to extend the library with new custom nodekits or draggers. If you indeed are writing extensions, see the information in the SoBaseKit class documentation.)

This is a virtual method, and the code in it should call SoField::setDefault() with argument TRUE on part fields that should not be written upon scenegraph export operations.

This is typically done when:

1.

field value is NULL and part is NULL by default

2.

it is a leaf SoGroup or SoSeparator node with no children

3.

it is a leaf listpart with no children and an SoGroup or SoSeparator container

4.

it is a non-leaf part and it's of SoGroup type and all fields are at their default values

Subclasses should usually override this to do additional settings for new member fields. From the subclass, do remember to call 'upwards' to your superclass' setDefaultOnNonWritingFields() method.

Reimplemented in SoTransformerDragger, SoDragger, SoHandleBoxDragger, SoInteractionKit, SoDragPointDragger, SoTransformBoxDragger, SoTrackballDragger, SoCenterballDragger, SoTabPlaneDragger, SoTabBoxDragger, SoSpotLightDragger, SoSeparatorKit, SoDirectionalLightDragger, SoShapeKit, SoJackDragger, and SoPointLightDragger.

void SoBaseKit::countMyFields (\fBSoOutput\fP *out)\fC [protected]\fP

Reference count the write connections to nodes in the catalog.

SbBool SoBaseKit::setPart (const intpartnum, \fBSoNode\fP *node)\fC [protected]\fP, \fC [virtual]\fP

Sets parts, updates nodekit scene graph, and makes sure graph is valid with respect to right siblings and parent. This method is virtual to enable subclasses to detect when a part changes value.

This method is not part of the original SGI Open Inventor API, but is an extension specific to Coin.

Reimplemented in SoInteractionKit.

\fBSoChildList\fP * SoBaseKit::children\fC [protected]\fP

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

SbBool SoBaseKit::connectionsSetUp\fC [protected]\fP

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

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