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Editorial Team
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Editorial Team
Asked: June 14, 20262026-06-14T17:16:19+00:00 2026-06-14T17:16:19+00:00

I’d like to create a map with an array… I saw a lot of

  • 0

I’d like to create a map with an array… I saw a lot of tutorials about platform game creatio on flash, but no one with the map moving.

So, I try to do it by myself.
Before moving my map, I’ve to create it, and THAT’s my problem !
So, I let you have a see on three layers code and make your opinion on.

Flash announce me an error #1009, he can’t access to a property or method of null object reference and I don’t see once ?

at Sansnom_fla::MainTimeline/createMap()
at Sansnom_fla::MainTimeline/frame1()

Layer 1

var grid:MovieClip = new MovieClip();   

// liste d'affichage
addChild(grid)                      

createMap()

Layer 2

function createMap():void{
    for (var i:int=0; i<20; i++){                               
        for (var j:int=0; j<15; j++){                           

            var T:int = 32
            var dT:int = T*.5
            var f:int = map[j][i]

            if(f>0) {
                var t:block = new block()
                t.x= i*T;       
                t.y= j*T;       
                t.gotoAndStop(f)        
                grid.addChild(t)
            }
        }
    }
}

Layer 3

 var map:Array = [
                     [1,1,1,1,1,1,10,0,0,11,1,1,1,1,1,1,1,1,1,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,1],
                     [1,0,0,0,0,0,6,1,0,0,4,4,4,4,0,0,6,1,0,1],
                     [1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,1,6,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,6,0,0,1,0,0,1,0,0,1,0,0,1,2,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,1,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,1,3,1],
                     [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
                     ]

var stock:Array = [
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
                 ]

Thanks a lot !
Ps : As you could learn, block is a movieClip where once frame is a particular block.

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  1. Editorial Team
    Editorial Team
    2026-06-14T17:16:20+00:00Added an answer on June 14, 2026 at 5:16 pm

    Why are you splitting code between layers? Don’t do that. Also you are calling map in layer 2 before it even exists yet (it isn’t created until layer 3’s code is run) so my recommendation is to stick it all into 1 layer, on 1 frame.

    Then adjust your code order like so:

    var map:Array = [
                     [1,1,1,1,1,1,10,0,0,11,1,1,1,1,1,1,1,1,1,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,1],
                     [1,0,0,0,0,0,6,1,0,0,4,4,4,4,0,0,6,1,0,1],
                     [1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,1,6,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,6,0,0,1,0,0,1,0,0,1,0,0,1,2,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
                     [1,1,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,1,3,1],
                     [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
                     ];
    
    var stock:Array = [
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
                 ];
    
    function createMap():void{
        for (var i:int=0; i<20; i++){                               
            for (var j:int=0; j<15; j++){                           
    
                var T:int = 32
                var dT:int = T*.5
                var f:int = map[j][i]
    
                if(f>0) {
                    var t:block = new block()
                    t.x= i*T;       
                    t.y= j*T;       
                    t.gotoAndStop(f)        
                    grid.addChild(t)
                }
            }
        }
    }
    
    var grid:MovieClip = new MovieClip();   
    
    // liste d'affichage
    addChild(grid);
    
    createMap();
    

    Also don’t forget the ; character, you have a habit of missing them out. Anyway, hope this helps!

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