| SoVRMLTimeSensor(3) | Library Functions Manual | SoVRMLTimeSensor(3) |
NAME¶
SoVRMLTimeSensor - The SoVRMLTimeSensor class is a multi-purpose time event generator.
SYNOPSIS¶
#include <Inventor/VRMLnodes/SoVRMLTimeSensor.h>
Inherits SoNodeEngine.
Public Member Functions¶
virtual SoType getTypeId (void)
const
virtual const SoEngineOutputData * getOutputData
(void) const
SoVRMLTimeSensor (void)
virtual void notify (SoNotList *list)
virtual void handleEvent (SoHandleEventAction
*action)
virtual void write (SoWriteAction *action)
Public Member Functions inherited from SoNodeEngine
void evaluateWrapper (void)
virtual int getOutputs (SoEngineOutputList &l)
const
SoEngineOutput * getOutput (const SbName
&outputname) const
SbBool getOutputName (const SoEngineOutput *output,
SbName &outputname) const
SbBool isNotifying (void) const
virtual void writeInstance (SoOutput *out)
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 doAction (SoAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void GLRenderBelowPath (SoGLRenderAction
*action)
virtual void GLRenderInPath (SoGLRenderAction
*action)
virtual void GLRenderOffPath (SoGLRenderAction
*action)
virtual void callback (SoCallbackAction *action)
virtual void getBoundingBox
(SoGetBoundingBoxAction *action)
virtual void getMatrix (SoGetMatrixAction *action)
virtual void pick (SoPickAction *action)
virtual void rayPick (SoRayPickAction *action)
virtual void search (SoSearchAction *action)
virtual void audioRender (SoAudioRenderAction
*action)
virtual void getPrimitiveCount
(SoGetPrimitiveCountAction *action)
virtual void grabEventsSetup (void)
virtual void grabEventsCleanup (void)
virtual void startNotify (void)
uint32_t getNodeId (void) const
virtual SoChildList * getChildren (void)
const
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
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 * createInstance (void)
static void initClass (void)
Static Public Member Functions inherited from SoNodeEngine
static void initClass (void)
static SoType getClassTypeId (void)
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)
static void initClasses (void)
static uint32_t 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)
static SoType getClassTypeId (void)
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)
static SoType getClassTypeId (void)
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¶
SoSFTime cycleInterval
SoSFBool enabled
SoSFBool loop
SoSFTime startTime
SoSFTime stopTime
SoEngineOutput cycleTime
SoEngineOutput fraction_changed
SoEngineOutput isActive
SoEngineOutput time
Protected Member Functions¶
virtual const SoFieldData *
getFieldData (void) const
virtual ~SoVRMLTimeSensor ()
virtual void inputChanged (SoField
*whichInput)
Protected Member Functions inherited from SoNodeEngine
SoNodeEngine (void)
virtual ~SoNodeEngine (void)
virtual SbBool readInstance (SoInput *in,
unsigned short flags)
void writeOutputTypes (SoOutput *out)
Protected Member Functions inherited from SoNode
SoNode (void)
virtual ~SoNode ()
Protected Member Functions inherited from SoFieldContainer
SoFieldContainer (void)
virtual ~SoFieldContainer ()
Protected Member Functions inherited from SoBase
SoBase (void)
virtual ~SoBase ()
SbBool hasMultipleWriteRefs (void) const
SbBool writeHeader (SoOutput *out, SbBool isgroup,
SbBool isengine) const
void writeFooter (SoOutput *out) const
virtual const char * getFileFormatName (void)
const
Static Protected Member Functions¶
static const SoFieldData **
getFieldDataPtr (void)
static const SoEngineOutputData **
getOutputDataPtr (void)
Static Protected Member Functions inherited from
SoNodeEngine
static const SoFieldData ** getFieldDataPtr
(void)
static const SoEngineOutputData **
getOutputDataPtr (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)
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 }
Protected Types inherited from SoBase
enum BaseFlags { IS_ENGINE = 0x01, IS_GROUP = 0x02 }
Protected Attributes inherited from SoNode
uint32_t uniqueId
Protected Attributes inherited from SoFieldContainer
SbBool isBuiltIn
Static Protected Attributes inherited from SoNode
static uint32_t nextUniqueId = 1
static int nextActionMethodIndex = 0
Detailed Description¶
The SoVRMLTimeSensor class is a multi-purpose time event generator.
The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the Consortium:
TimeSensor {
exposedField SFTime cycleInterval 1 # (0,inf)
exposedField SFBool enabled TRUE
exposedField SFBool loop FALSE
exposedField SFTime startTime 0 # (-inf,inf)
exposedField SFTime stopTime 0 # (-inf,inf)
eventOut SFTime cycleTime
eventOut SFFloat fraction_changed # [0, 1]
eventOut SFBool isActive
eventOut SFTime time
}
TimeSensor nodes generate events as time passes. TimeSensor nodes can be used for many purposes including:
- driving continuous simulations and animations;
- controlling periodic activities (e.g., one per minute);
- initiating single occurrence events such as an alarm clock.
The TimeSensor node contains two discrete eventOuts:
isActive and cycleTime. The isActive eventOut sends
TRUE when the TimeSensor node begins running, and FALSE when it stops
running. The cycleTime eventOut sends a time event at
startTime and at the beginning of each new cycle (useful for
synchronization with other time-based objects). The remaining eventOuts
generate continuous events. The fraction_changed eventOut, an SFFloat
in the closed interval [0,1], sends the completed fraction of the current
cycle. The time eventOut sends the absolute time for a given
simulation tick.
If the enabled exposedField is TRUE, the TimeSensor node is enabled and may be running. If a set_enabled FALSE event is received while the TimeSensor node is running, the sensor performs the following actions:
- evaluates and sends all relevant outputs;
- sends a FALSE value for isActive;
- disables itself.
Events on the exposedFields of the TimeSensor node (e.g., set_startTime) are processed and their corresponding eventOuts (e.g., startTime_changed) are sent regardless of the state of the enabled field. The remaining discussion assumes enabled is TRUE.
The e\ loop, startTime, and stopTime exposedFields
and the isActive eventOut and their effects on the TimeSensor node are
discussed in detail in 4.6.9, Time-dependent nodes
(http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.6.9).
The 'cycle' of a TimeSensor node lasts for cycleInterval seconds. The value
of cycleInterval shall be greater than zero.
A cycleTime eventOut can be used for synchronization purposes such as sound with animation. The value of a cycleTime eventOut will be equal to the time at the beginning of the current cycle. A cycleTime eventOut is generated at the beginning of every cycle, including the cycle starting at startTime. The first cycleTime eventOut for a TimeSensor node can be used as an alarm (single pulse at a specified time).
When a TimeSensor node becomes active, it generates an isActive = TRUE event and begins generating time, fraction_changed, and cycleTime events which may be routed to other nodes to drive animation or simulated behaviours. The behaviour at read time is described below. The time event sends the absolute time for a given tick of the TimeSensor node (time fields and events represent the number of seconds since midnight GMT January 1, 1970).
fraction_changed events output a floating point value in the closed interval [0, 1]. At startTime the value of fraction_changed is 0. After startTime, the value of fraction_changed in any cycle will progress through the range (0.0, 1.0]. At startTime + N cycleInterval, for N = 1, 2, ..., that is, at the end of every cycle, the value of fraction_changed is 1.
Let now represent the time at the current simulation tick. Then the time and fraction_changed eventOuts can then be computed as:
time = now temp = (now - startTime) / cycleInterval f = fractionalPart(temp) if (f == 0.0 && now > startTime) fraction_changed = 1.0 else fraction_changed = f
where fractionalPart(x) is a function that returns the fractional part, (that is, the digits to the right of the decimal point), of a nonnegative floating point number.
A TimeSensor node can be set up to be active at read time by specifying loop TRUE (not the default) and stopTime less than or equal to startTime (satisfied by the default values). The time events output absolute times for each tick of the TimeSensor node simulation. The time events shall start at the first simulation tick greater than or equal to startTime. time events end at stopTime, or at startTime + N cycleInterval for some positive integer value of N, or loop forever depending on the values of the other fields. An active TimeSensor node shall stop at the first simulation tick when now >= stopTime > startTime.
No guarantees are made with respect to how often a TimeSensor node generates time events, but a TimeSensor node shall generate events at least at every simulation tick. TimeSensor nodes are guaranteed to generate final time and fraction_changed events. If loop is FALSE at the end of the Nth cycleInterval and was TRUE at startTime + M cycleInterval for all 0 < M < N, the final time event will be generated with a value of (startTime + N cycleInterval) or stopTime (if stopTime > startTime), whichever value is less. If loop is TRUE at the completion of every cycle, the final event is generated as evaluated at stopTime (if stopTime > startTime) or never.
An active TimeSensor node ignores set_cycleInterval and set_startTime events. An active TimeSensor node also ignores set_stopTime events for set_stopTime less than or equal to startTime. For example, if a set_startTime event is received while a TimeSensor node is active, that set_startTime event is ignored (the startTime field is not changed, and a startTime_changed eventOut is not generated). If an active TimeSensor node receives a set_stopTime event that is less than the current time, and greater than startTime, it behaves as if the stopTime requested is the current time and sends the final events based on the current time (note that stopTime is set as specified in the eventIn).
A TimeSensor read from a VRML file shall generate isActive TRUE, time and fraction_changed events if the sensor is enabled and all conditions for a TimeSensor to be active are met.
Constructor & Destructor Documentation¶
SoVRMLTimeSensor::SoVRMLTimeSensor (void)¶
Constructor.
SoVRMLTimeSensor::~SoVRMLTimeSensor () [protected], [virtual]¶
Destructor.
Member Function Documentation¶
SoType SoVRMLTimeSensor::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 * SoVRMLTimeSensor::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 SoFieldContainer.
const SoEngineOutputData * SoVRMLTimeSensor::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 SoNodeEngine.
void SoVRMLTimeSensor::notify (SoNotList * l) [virtual]¶
Notifies all auditors for this instance when changes are made.
Reimplemented from SoNodeEngine.
void SoVRMLTimeSensor::handleEvent (SoHandleEventAction * action) [virtual]¶
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.
void SoVRMLTimeSensor::write (SoWriteAction * action) [virtual]¶
Action method for SoWriteAction.
Writes out a node object, and any connected nodes, engines etc, if necessary.
Reimplemented from SoNode.
void SoVRMLTimeSensor::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 The Right Thing when a specific field is changed.
Reimplemented from SoNodeEngine.
Member Data Documentation¶
SoSFTime SoVRMLTimeSensor::cycleInterval¶
The cycle interval. Default value is 1. Must be > 0.
SoSFBool SoVRMLTimeSensor::enabled¶
Used to enable/disable timer. Default value is TRUE.
SoSFBool SoVRMLTimeSensor::loop¶
TRUE if timer should loop. Default value is FALSE.
SoSFTime SoVRMLTimeSensor::startTime¶
The timer start time. Default value is 0.0.
SoSFTime SoVRMLTimeSensor::stopTime¶
The timer stop time. Default value is 0.0.
SoEngineOutput SoVRMLTimeSensor::cycleTime¶
An eventOut that is sent when a new cycle is started.
SoEngineOutput SoVRMLTimeSensor::fraction_changed¶
An eventOut that is sent for each tick, containing a number between 0 and 1.
SoEngineOutput SoVRMLTimeSensor::isActive¶
An eventOut that is sent when the timer is enabled/disabled.
SoEngineOutput SoVRMLTimeSensor::time¶
An eventOut that is sent for each tick, containing the current time.
Author¶
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