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chienbleu
chienbleu
Known Participant
May 19, 2023
Answered

AS3: How do I do collision with multiple instances?

  • May 19, 2023
  • 1 reply
  • 2203 views

I know I already asked a few months ago but I wasn't specific enough and had less coding expirience. I don't know how to code in a class so I want to code in a keyframe if that makes sense.

I want to have a thing that can collide with a bunch of squares that I added to stage through code. The only way I know how to do this is by painstakingly dragging each instance to the stage and giving it another name and using multiple hitTestObject but I don't want to do that.

This would be very helpful for things like a catcher game, flappy bird, snake game, etc. What is the best way to do this?

This topic has been closed for replies.
Correct answer kglad

tha tshould work


you only use the hittest when creating a square.  you probably want to start a loop (eg, enterframe) when dragging and perform hittests.

1 reply

kglad
Community Expert
kgladCommunity Expert
Community Expert
May 19, 2023

one way; add the elements to an array and loop through the array using your hittestobject. eg,

 

var a:Array = [];

var sqNum:int = 22;

 

for(var i:int=0;i<sqNum;i++){

createSquareF();

}

 

function createSquareF():void{

var sq:MovieClip = new Square(); // linkage id

// add to stage, position etc

a.push(sq);

}

 

function hitTestF():void{

for(var i:int=a.length-1;i>=0;i--){

if(yourthing.hitTestObject(a[i])){

// do whatever. loop backwards if you are "destroying" a elements and want to remove them from the array.

}

}

}

    chienbleu
    chienbleuAuthor
    Known Participant
    May 20, 2023

    ok, i adjusted it and there is no errors except one saying the paramater must be non-null or a weirder one where  i said the popping value to 1 and "Property 1 not found on builtin.as$0.MethodClosure and there is no default value." however it's not doing anything at all. here's the code

     

    var aaa:Array = [];
    var sqNum:int = 10;
     
    for(var i:int=0;i<sqNum;i++)
    {
    createSquareF();
    }
     
     
    function createSquareF():void
    {
    var squarey:square = new square(); 
    addChild(squarey)
    squarey.x = (Math.random()* 669)
    squarey.y = (Math.random()* 420)
    aaa.push(squarey);
    if (thing.hitTestObject(aaa[i]))
    {
    removeChild(squarey)
    aaa.pop[1]
    }
    }
     
     
     
    function hitTestF():void
    {
    for(var i:int=aaa.length; i>=0;i--)
    {
    if(thing.hitTestObject(aaa[i]))
    {
    trace("ad")
    }
    }
    }
    chienbleu
    chienbleuAuthor
    Known Participant
    May 20, 2023

    actually ignore the pop because i actually just made  thesquare move somewhere else rather than deleting it. there's no errors

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