AS3: How do I do collision with multiple instances?

[chienbleu]

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?

[kglad]

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]

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]

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

[kglad]

your for-loop's initial value is incorrect.

[chienbleu]

what do you mean?

[kglad]

for(var i:int=aaa.length; i>=0;i--)

should be

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

[chienbleu]

still does nothing 😞

[kglad]

do you see any error message(s) when testing?

[chienbleu]

nuh uh

[kglad]

upload your file to a online storage and post here the link 

[chienbleu]

hold i just have to figure out how to do that

[chienbleu]

i just have ot clear some storage

[kglad]

google it. eg, wetransfer, onedrive, etc

[chienbleu]

could i just email it to you

[chienbleu]

oh wait nvm

[kglad]

?

[kglad]

your fla file

[chienbleu]

oh right that doesn't work

[chienbleu]

i emailed it to you (hopefully)

[chienbleu]

hold on

[chienbleu]

https://drive.google.com/file/d/1kLfaeKrv-WswV_FOy2cGqif9znUklQ4Z/view?usp=share_link

[chienbleu]

tha tshould work

[kglad · Accepted solution]

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