Is there a fire once like method?

Help & Support
1

Is there any internal coding to fire something once within the update function playcanvas uses?

So for instance let’s say I want to set an animation with a isPressed but it fires only once instead of continuously which usually results to a freeze of animation since it keeps firing.

2

Not 100% sure on what you are asking here. In the case of isPressed, you have wasPressed which is only true on the frame that the button is first pressed.

3

Yea I know that wasPressed is a function available to me, what I’m asking is it possible to do something like this more simpler using some sort of javascript code I don’t know about. Otherwise the work arounds I have are fine for example :

var TriggerOnce = pc.createScript('triggerOnce');

TriggerOnce.prototype.initialize = function() {
    this.once = 'Play me once';
    this.keepGoing = 'Play me a lot';
    this.playState = 'none';
};

TriggerOnce.prototype.update = function(dt) {
    
    if(this.app.keyboard.isPressed(pc.KEY_1)){
        
        console.log(this.keepGoing);
        
        if(this.playState != 'played'){
            this.playOnce();  
        }
        
    } else if(this.app.keyboard.wasReleased(pc.KEY_1) && this.playState === 'played'){
        
        this.playState = 'none';
        
    }
};

TriggerOnce.prototype.playOnce = function(){
    
    console.log(this.once);
    this.playState =  'played';
    
};

Fire something once while still firing other things constantly within the ‘isPressed’ function.

Like there is a Trigger Once While True function in the game engine Construct 3 as well as Unreal Engine 4 with Do Once. Was curious if there was something like this for Playcanvas, or some system that is more optimized that I don’t know about within coding paradigms or javascript.

4

There is an event listener function once that registers to an event and only triggers on the first time the event fires. That’s the closest I can think of.

5

This is pretty amazing! This was pretty much what I was looking for, and infact it’s even better! Thanks :slight_smile:

Here is the code:

var TriggerOnce = pc.createScript('triggerOnce');

TriggerOnce.prototype.initialize = function() {
    
    this.playOnce = { };
    pc.events.attach(this.playOnce);
    
    this.playOnce.once('test', function (str) {
        console.log(str);
        this.entity.translate(0,0.2,0);
    },this);
    
};

TriggerOnce.prototype.update = function(dt) {
    
    if(this.app.keyboard.isPressed(pc.KEY_1)){
        
        this.playOnce.fire('test','Play Once');
         
    } else if(this.app.keyboard.wasReleased(pc.KEY_1)){
        
        this.playOnce.once('test', function (str) {
            console.log(str);
            this.entity.translate(0,0.2,0);
        },this);
        
    }
};