Creating a tile map with nested arrays

Question

I'm getting crazy with arrays so I need your help:

I created a couple of nested arrays:

private var mainArray:Array=[arrayOne,arrayTwo,arrayThree];
private var arrayOne=[item1,item2,item3];
private var arrayTwo=[item4,item5,item6];
private var arrayThree=[item7,item8,item9];

First, when I try for example: trace(mainArray[2][0]) Flash Builder's output is: undefined or null (instead of item7).

Second, I'm not able to find any row/col position (obviously...because every object seems to be undefined):

private function findPosition(row:int,col:int)
{
    for(var row:int=0;row<=mainArray.length;row++)
    {
      for(var col:int=0;col<=mainArray[row].length;col++
      {
           trace(row,col,mainArray[row][col]);
      }
    }
}

It always throws me some type of error (I tryied many self-made solutions and google searches).

I need to find every row/col position and place artworks according to it, I'm creating a tile map, and this may be the simplest way for me(beginner).

Thanks for every possible solution.

Just for the sake of terminology, you're referring to 2-dimensional arrays. — mihai
– mihai, Commented Jul 23, 2014 at 17:16

Karmacon · Accepted Answer · 2014-07-21 23:53:19Z

2

You're trying to populate the mainArray before the other Arrays have been created. Move line 1 down to line 4.

private var arrayOne:Array = [item1,item2,item3];
private var arrayTwo:Array = [item4,item5,item6];
private var arrayThree:Array = [item7,item8,item9];
private var mainArray:Array = [arrayOne,arrayTwo,arrayThree];

answered Jul 21, 2014 at 23:53

Karmacon

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6 Comments

Gio31290 Over a year ago

I tryied to move mainArray down, the output is always 'null', but I think the problem was another: My 'items' were Bitmaps. So I change them to String and it seems to work now. I thought arrays could contain bitmaps.

Karmacon Over a year ago

Arrays can contain anything. If you were getting null, you were most likely instantiating your bitmaps incorrectly.

Gio31290 Over a year ago

[Embed(source="../folder/image.png")] public static const Image:Class; var tile:Bitmap=new Image() as Bitmap; This is the way I create my instance. But now my problem is that I can't figure out how to show a determined tile according to position.

Karmacon Over a year ago

When do you instantiate your items? Perhaps it's the same issue as above, that you need to create the items before adding them into the Array. I would need to see more of your code.

Gio31290 Over a year ago

I used a for loop to find the position and 'trace('tile placed');'. It seems to work as I see 12 'tile placed' in the output (my tiles are 12). I only don't understand how can I assign a different position to every single tile, looping through the array.

|

mihai · Accepted Answer · 2014-07-23 17:21:24Z

0

you can create a 2-dimensional array all inline

private var mainArray:Array= [
      [item1,item2,item3],
      [item4,item5,item6],
      [item7,item8,item9]
];

or

private var mainArray:Array = new Array();

then in a method add the sub arrays

mainArray.push([item1,item2,item3]);
mainArray.push([item4,item5,item6]);
mainArray.push([item7,item8,item9]);

answered Jul 23, 2014 at 17:21

mihai

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