Global variable "does not exist in current context"

Questions & Answers
1

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?

2

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.