SoCounter(3) The SoCounter class is an integer counter engine.

SYNOPSIS


#include <Inventor/engines/SoCounter.h>

Inherits SoEngine.

Public Member Functions


virtual SoType getTypeId (void) const

virtual const SoFieldData * getFieldData (void) const

virtual const SoEngineOutputData * getOutputData (void) const

SoCounter (void)

Static Public Member Functions


static SoType getClassTypeId (void)

static void * createInstance (void)

static void initClass (void)

Public Attributes


SoSFShort min

SoSFShort max

SoSFShort step

SoSFTrigger trigger

SoSFShort reset

SoEngineOutput output

SoEngineOutput syncOut

Protected Member Functions


virtual ~SoCounter (void)

Static Protected Member Functions


static const SoFieldData ** getInputDataPtr (void)

static const SoEngineOutputData ** getOutputDataPtr (void)

Detailed Description

The SoCounter class is an integer counter engine.

The engine counts from its min value to its max value, adding the value of step each time trigger is touched.

SoCounter provides a convenient way of keeping track of the number of times some event in your application is triggered.

Constructor & Destructor Documentation

SoCounter::SoCounter (void)

Default constructor.

SoCounter::~SoCounter (void) [protected], [virtual]

Destructor.

Protected, as engines are not supposed to be explicitly deleted, but rather take care of their own destiny by monitoring their reference count.

Member Function Documentation

SoType SoCounter::getClassTypeId (void) [static]

This static method returns the SoType object associated with objects of this class.

Reimplemented from SoEngine.

SoType SoCounter::getTypeId (void) const [virtual]

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.

const SoFieldData ** SoCounter::getInputDataPtr (void) [static], [protected]

Returns the SoFieldData class which holds information about inputs in this engine.

Reimplemented from SoEngine.

const SoEngineOutputData ** SoCounter::getOutputDataPtr (void) [static], [protected]

Returns the SoEngineOutputData class which holds information about the outputs in this engine.

Reimplemented from SoEngine.

const SoFieldData * SoCounter::getFieldData (void) const [virtual]

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

Reimplemented from SoFieldContainer.

const SoEngineOutputData * SoCounter::getOutputData (void) const [virtual]

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

Implements SoEngine.

void SoCounter::initClass (void) [static]

Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

Reimplemented from SoEngine.

Member Data Documentation

SoSFShort SoCounter::min

Minimum value for counter.

SoSFShort SoCounter::max

Maximum value for counter.

SoSFShort SoCounter::step

Counter step value.

SoSFTrigger SoCounter::trigger

Increment counter (using step).

SoSFShort SoCounter::reset

Reset counter to this value. The value will be clamped between min and max, and step will be accounted for.

SoEngineOutput SoCounter::output

(SoSFShort) Output which contains the current counter value.

SoEngineOutput SoCounter::syncOut

(SoSFTrigger) Triggers every time counter restarts at SoCounter::min.

Author

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