Global variable "does not exist in current context"

Question

Hi all, I'm newish to unity and C#, but this is the first issue I've run into that has really stumped me. I'm currently writing code to highlight all tiles within a unit's movement range, but I'm getting an error that claims that an array (int[,] tilesHighlighted) does not exist in the context of a function, despite it being declared globally.

 public class rangeHandler : MonoBehaviour
 {
     public tileMap map = new tileMap();
     public tileData td = new tileData();
 
     int[,] tilesHighlighted;    
 
     public void showRange(int x, int y, int r)
     {
         tilesHighlighted[map.graph[x, y].x, map.graph[x,y].y]
                         = map.tileAtNode(map.graph[x, y].x, map.graph[x, y].y);
 
 
         foreach (Node n in map.graph[x, y].edges)
         {
             if (tilesHighlighted(n.x,n.y) == null)
             {
 
 
                 tilesHightlighted[n.x, n.y] = map.tileAtNode[n.x, n.y];
 
             }
         }
         r--;
     }

Everywhere past "foreach", it's giving me an error. Its first usage at the beginning of showRange() is fine. Any ideas?

Answer 1

Answer by Suddoha · Oct 05, 2015 at 10:51 AM

The line that causes this is

  if (tilesHighlighted(n.x,n.y) == null)

because you use parenthesis here, you probably wanted to use [n.x,n.y] instead of (n.x,n.y).

Also, you'll probably get NullReferenceExceptions because the script does not populate the array unless you do that through another script already.

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Bunny83 · Oct 05, 2015 at 12:18 PM 1

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Well, analyzed. And to repeat what Bonfire said there's a typing error in line 20 as well.

Bonfire-Boy · Oct 05, 2015 at 12:36 PM 1

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Yep, good spot.

Not related to the error, but since the OP is new to C# it may also be worth pointing out that the r-- at the end of showRange() has no impact, since it's only changing a local variable that is discarded immediately.

Global variable "does not exist in current context"

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