Hello, I have designed a “grid system” storing positions for my enemies to move to. However, for some reason my methods seem unable to access the array or list inside of my main class. The array/lists are properly setup, a list.Count or array.Length check will show that they are both filled with elements, so they aren’t the problem. But for some bizarre reason these same checks (when used outside of the start function) return a 0, meaning no elements are in the array/list anymore? What happened here? I will add that I am using constructors, but again, I can find no issues with this constructor, it seems to build just fine. You can access any of the nodes within the start function, but from no where else. Please help!
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
// node that stores one space in the "grid" as well as its current vacancy (might be useless but it's there just in case)
public class Node
{
private Vector3 position;
private bool isOccupied;
public Node(Vector3 newPos)
{
position = newPos;
isOccupied = false;
}
public Vector3 GetPosition()
{
return position;
}
public bool IsVacant()
{
return !isOccupied;
}
}
// creates a list of nodes, as well as a list of nodes that are currently free; also contains functions for managing these lists
public class GridController : MonoBehaviour
{
private Node[] nodes;
private List<int> freeNodes; // list of numbers from 0 to x, pick one at random and then plug it into nodes for a free position
// Start is called before the first frame update
void Start()
{
// the list of nodes and positions
nodes = new Node[12];
nodes[0] = new Node(new Vector3(-3.2f, -0.7f, 0.0f));
nodes[1] = new Node(new Vector3(-1.3f, -0.7f, 0.0f));
nodes[2] = new Node(new Vector3(1.3f, -0.7f, 0.0f));
nodes[3] = new Node(new Vector3(3.2f, -0.7f, 0.0f));
nodes[4] = new Node(new Vector3(-3.2f, -3.4f, 0.0f));
nodes[5] = new Node(new Vector3(-1.3f, -3.4f, 0.0f));
nodes[6] = new Node(new Vector3(1.3f, -3.4f, 0.0f));
nodes[7] = new Node(new Vector3(3.2f, -3.4f, 0.0f));
nodes[8] = new Node(new Vector3(-3.2f, -5.7f, 0.0f));
nodes[9] = new Node(new Vector3(-1.3f, -5.7f, 0.0f));
nodes[10] = new Node(new Vector3(1.3f, -5.7f, 0.0f));
nodes[11] = new Node(new Vector3(3.2f, -5.7f, 0.0f));
freeNodes = new List<int>();
// add the (currently) free nodes to the other list
for (int i = 0; i < 12; i++)
{
freeNodes.Add(i);
}
Debug.Log("Free nodes currently contains " + freeNodes.Count + " nodes.");
}
// public functions to be accessed by enemies and modify the free node list
// will remove a given int from the list, meaning it's respective node is now "occupied"
public void OccupyFreeNode(int num)
{
freeNodes.Remove(num);
}
// will add a given int to the list, meaning it's respective node is now free.
// note: intended to recieve the enemy's stored int of its current node, meaning the list can never have duplicate numbers/etc
public void FreeUpFreeNode(int num)
{
freeNodes.Add(num);
}
// will return a free position for an enemy while removing it from its list
public int GetRandomFreeNode()
{
int temp;
/*
if (freeNodes.Count != 0)
temp = freeNodes[Random.Range(0, freeNodes.Count)];
else
temp = -1; // intentional game breaking error to let me know i screwed up
*/
Debug.Log("Free nodes currently contains " + freeNodes.Count + " nodes.");
temp = freeNodes[Random.Range(0, freeNodes.Count)];
OccupyFreeNode(temp);
return temp;
}
// will return the Vector3 of the given index
public Vector3 GetNode(int num)
{
Debug.Log("I tried to access " + num.ToString());
return nodes[num].GetPosition();
}
}
EDIT: Okay the above code definitely works, testing the methods inside of an Update() method functions perfectly. But for some reason it refuses to let other objects access the same lists using the same variables. See enemy code below.
