Handling of multiple callbacks and collisions

Hello again Selim

I find that multiple collisions declarations have been slowing down the overall performance of the animation of my player and movement, so I thought about registering different callbacks for each "screen". I don't think there is no way to unregister a given callback previously declared so that I can remove the previous collisions checking functions. I will file a feature request on the github if you think this is a good idea.

Here is what I was trying to do:

$("#player").collision("#building_map, #building_map > div, #casa_map, #casa_map > div").each(function() {                 
            //parent checks and code
        });

Thanks once again
Pedro

selim

Hi Pedro,

There is a simple way to unregister a callback registered through the registerCallback() function: it the return value is true then the callback will be unregistered and never called again. (if the return value is a number it will be the new refresh rate for this callback).

I'm not exactly sure I understand what you're trying to do but if you want to check different type of collision depending on the situation I would use a variable to hold a value that will help you differentiate between those situations and then check the appropriate collisions. All of this on the same callback. This would look something like that:

var myState = INITIAL_STATE;
 
$.playground().registerCallback(function(){
   if (/* some condition */) {
      myState = NEW_STATE;
   }
 
   switch (myState) {
      case INITIAL_STATE:
         $("#player").collision("#building_map, #building_map div").each(function() {                 
            //do something
         });
         break;
      case NEW_STATE:
         $("#player").collision("#casa_map, #casa_map div").each(function() {                 
            //do something else
         });
         break;
   }
}, 30);

But you could also register a callback for the first state and test each time if the condition is meet to go to the next state, then register a new callback where you will test the new collisions and un-register the current callback. But I think it will make you code less readable.

I see... I'll go for the state check then... Too much vars indeed, but, I think that's what a game is made of :D
Thank you once again Selim :D

Best regards
Pedro

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