NAME

       SoGate -

       The SoGate class is used to selectively copy values from input to output.

       This engine will forward values from the SoGate::input field to the SoGate::output field
       when the SoGate::enable field is TRUE.

SYNOPSIS

       #include <Inventor/engines/SoGate.h>

       Inherits SoEngine.

   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.
       virtual const SoFieldData * getFieldData (void) const
       virtual const SoEngineOutputData * getOutputData (void) const
       SoGate (SoType type)

   Static Public Member Functions
       static SoType getClassTypeId (void)
       static void * createInstance (void)
       static void initClass (void)

   Public Attributes
       SoSFBool enable
       SoSFTrigger trigger
       SoMField * input
       SoEngineOutput * output

   Protected Member Functions
       virtual void inputChanged (SoField *which)

   Static Protected Member Functions
       static const SoFieldData ** getInputDataPtr (void)
       static const SoEngineOutputData ** getOutputDataPtr (void)

   Additional Inherited Members

Detailed Description

       The SoGate class is used to selectively copy values from input to output.

       This engine will forward values from the SoGate::input field to the SoGate::output field
       when the SoGate::enable field is TRUE.

       Note that this engine's output field deviates a little from the 'standard' output
       mechanism of the majority of engine classes: the SoGate::output is not a permanent
       SoEngineOutput instance, but a pointer to a SoEngineOutput instance. The reason for this
       is that it is necessary to allocate the output field dynamically to make it match what the
       SoGate::input is connected to since the type of the SoGate::output always should be the
       same as the type of the SoGate::input.

       The file format for this field is a bit special. Note the leading type specification,
       which is not necessary for most other field types:

       Gate {
         type <multivaluefieldtype>
         [...fields...]
       }

Constructor & Destructor Documentation

   SoGate::SoGate (SoTypetype)
       Constructor. The type of the input/output is specified in type.

Member Function Documentation

   virtual SoType SoGate::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.

   virtual const SoFieldData* SoGate::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.

   virtual const SoEngineOutputData* SoGate::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 SoGate::inputChanged (SoField *which) [protected],  [virtual]
       Called when an input is changed. The default method does nothing, but subclasses may
       override this method to do The Right Thing when a specific field is changed.

       Reimplemented from SoEngine.

Member Data Documentation

   SoSFBool SoGate::enable
       Set whether or not to forward from input to output field.

   SoSFTrigger SoGate::trigger
       Copy the current values of the input field once to the output field.

   SoMField * SoGate::input
       The multivalue input field which we will forward to the output when SoGate::enable is
       TRUE.

   SoEngineOutput * SoGate::output
       (SoMField) This is the field output containing the values of SoGate::input.

       The type of the field will of course match the type of the input field.

Author

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