Cocos2d-x study notes (11.7) Repeat RepeatForever

1. member variables

Repeat：

    unsigned int _times; // the Create parameters 
    unsigned int _Total; // number of executed
     float _nextDt; // startWithTarget calculation, the current time all action executed proportion of the total time, schedule the next turn Repeat needed　
     BOOL _actionInstant; // create instantaneous determination of whether Action 
    FiniteTimeAction * _innerAction; // create parameters

RepeatForever：

    ActionInterval * _innerAction; // the Create parameters

2. create

Repeat::create(FiniteTimeAction *action, unsigned int times)
RepeatForever::create(ActionInterval *action)

Repeat：

After two members of the variable assignment parameter to determine whether the action is instantaneous action:

ActionInterval :: initWithDuration (d) // when the operation frequency and a long operation * 
_actionInstant of dynamic_cast = <ActionInstant *> (Action)? To true : to false ; 
_Total = 0;

RepeatForever: action parameter set variables.

3. start with target

Repeat：

    = _Total 0 ; 
    _nextDt = _innerAction-> getDuration () / _duration; // a proportion of total time action 
    ActionInterval :: startWithTarget (target); 
    _innerAction -> startWithTarget (target);

RepeatForever：

    ActionInterval::startWithTarget(target);
    _innerAction->startWithTarget(target);

4. update

RepeatForever no update method. Each frame, RepeatForever step method calls the action step.

Repeat:

Briefly, if the current progress is not progress to the next Repeat the trigger, continue this unfinished update. To trigger the next Repeat progress, first to complete the implementation of this Repeat, Repeat next action is to initialize and calculated to trigger progress at the next Repeat. If the total number of times, stop the current action, otherwise perform the action update.

void Repeat :: Update ( float dt) 
{ 
    IF (dt> = _nextDt) // current progress to reach the next Repeat trigger progress 
    {
         the while (dt> = _nextDt && _Total <_times) // arrive at times Repeat trigger progress and the number of executions not required to enter circulation 
        {
             IF ((sendUpdateEventToScript (! 1.0f , _innerAction))) 
                _innerAction -> Update ( 1.0f ); // execute Action 
            _Total ++; // perform well, the number of +1 

            _innerAction -> STOP () ; 
            _innerAction -> startWithTarget (_target); //Reinitialize Action 
            _nextDt = _innerAction-> getDuration () / * _ DURATION (_Total + . 1 ); // Set to trigger a new schedule of Repeat 
        } 

// ...
 
        IF (! _ActionInstant) // can not be instantaneous action 
        {
             IF (_Total _times ==) // reaching the total number of restrictions 
            {
 
                _innerAction-> STOP (); 
            } 
            the else 
            { 
                IF ((sendUpdateEventToScript (dt - (_nextDt - _innerAction-> getDuration () /! _duration), _innerAction))) 
                    _innerAction -> Update (dt - (_nextDt - _innerAction-> getDuration () /_duration)); // execute 
            } 
        } 
    } 
    the else  // not progress to the next trigger once Repeat to continue to implement this Repeat of Action 
    {
         IF ((sendUpdateEventToScript (fmodf (dt * _times,! 1.0f ))), _innerAction) 
            _innerAction -> Update (the fmodf (dt * _times, 1.0f )); // parameters for the current Repeat progress 
    } 
}