List of Arrays?

Question

Hi, all!

I constructed a grid for my enemies to use for positioning a while ago. The grid is a series of Vector3's expressed in [ row, column ] form.

Well, I want to spawn randomly selected sets of enemies at specified places in the grid, so I made an enum called EnemyType which has 4 types: Probe, Tank, Bomb, and Null.

For easy placement on the grid, I made temporary variables in the start function that reference these types ( P, T, B, and o for null ).

I need to make an array of these 2D arrays so I can select individual [row, column] enemy sets to be iterated through and spawned.

However, Unity seems to either disagree with the idea of a [,,], or I just don't know how to write it.

Is this wrong?

 #pragma strict
 
 @HideInInspector
 var easySets : EnemyType[,,];
 
 //Creating contaners for our SetArrays
 
 function Start () {
     
     var P : EnemyType = EnemyType.Probe;
     var B : EnemyType = EnemyType.Bomb;
     var T : EnemyType = EnemyType.Tank;
     var o : EnemyType = EnemyType.Null;
     
     // Setting up quick-access, one-key variables to create sets
     //EasySets = new EnemyType[2,7,7];
     easySets = [//START EASY SETS
     
     [P, o, o, o, o, o, P,
     o, P, o, P, o, P, o,
     o, o, P, o, P, o, o,
     o, o, o, o, o, o, o,
     o, o, P, o, P, o, o,
     o, P, o, P, o, P, o,
     P, o, o, o, o, o, P],
     
     [P, o, o, o, o, o, P,
     o, P, o, P, o, P, o,
     o, o, P, o, P, o, o,
     o, o, o, o, o, o, o,
     o, o, P, o, P, o, o,
     o, P, o, P, o, P, o,
     P, o, o, o, o, o, P]
     ]; //END EASY SETS
 
 }

If so, how should I write it? I just want to be able to extract a single 2D Array, iterate through it, and spawn enemies accordingly. The iteration and spawning part I already know how to do, so really I just need help on expressing it.

Thanks a ton! - YA

Answer 1

Best Answer

Answer by whydoidoit · May 21, 2013 at 02:42 AM

So your initialization there is creating a jagged array of EnemyType:

     var array : EnemyType[][];

This isn't what you were expecting and I don't think that there is a syntax to initialise a multi-dimensional array in any case.

If you wanted to make an array that was 3d jagged var array: EnemyType[][][] then you would need to initialize it like this:

    easySets = [
         [ 
           [P, o, o, o, o, o, P],
           [o, P, o, P, o, P, p],
           ...
          ],
          ...
         ];

This you could access using easySets[x][y][z] rather than easySets[x,y,z];

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youngapprentice · May 21, 2013 at 11:02 AM 0

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Oh. So you are saying that there isn't a manual way to populate a multidimensional array save through iteration?

Jagged array is fine by me as well. However, whenever I type the statement

 var easySets : EnemyType[][][];

I get an error thrown at me about the semicolon at the end. I don't think the compiler is expecting or reading [][][]...

youngapprentice · May 22, 2013 at 12:02 AM 0

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This: http://answers.unity3d.com/questions/54695/how-to-declare-and-initialize-multidimensional-arr.html

tells me that I can't set the type of a jagged array. Thanks for the help! That was the final piece of the puzzle.

youngapprentice · May 22, 2013 at 01:34 AM 0

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Just in case anyone was interested, I wrote a script that would create a square 2D array from a single array of elements (you have to specify how big the square array is in the i and u for loops but it works).

 function $$anonymous$$akeASet( myArray : EnemyType[] ){
     
     var my$$anonymous$$ultiArray : EnemyType[,] = new EnemyType[7,7];
     var q = 0;
     for( var i = 0; i < 7; i++ ){
         for( var u = 0; u < 7; u++){
             my$$anonymous$$ultiArray[i,u] = myArray[ q ];
             q++;        
         }
         }
 }

List of Arrays?

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