Accessing other scripts using GetComponent()

Questions & Answers
1

I’ve been working on my runner game and I’m having some difficulty making using of GetComponent. What I want to do is have a script: GameController store an enemy speed variable that every second, I want it raise the global speed of my enemy objects.

My problem is that I’m having trouble figuring out how to use GetComponent to get it to work. Is there a way to access the script: EnemyBehavior directly and change the enemySpeed variable in it? Or do I need to do something else to modify the behavior?

What I did that didn’t work was the following:

public var lSpawnLoc: GameObject;
public var fSpawnLoc: GameObject;
public var startSpeed: float = 0.8;
private var spawnObject1 : SpawnObject;
private var spawnObject2 : SpawnObject;
private var enemyBehavior : EnemyBehavior;
private var newEnemySpeed : float;

function Start ()
{
spawnObject1 = lSpawnLoc.GetComponent(SpawnObject);
spawnObject2 = fSpawnLoc.GetComponent(SpawnObject);
InvokeRepeating("Spawn",3.0,3.0);

enemyBehavior.GetComponent(EnemyBehavior);

InvokeRepeating ("AddSpeed",1.0,1.0);
}



function Spawn()
{
 var choice: int = Random.Range(0,2);
 
 if (choice == 0)
 	{
 	spawnObject1.CreateEnemy();		
 	}
	else
	{
	spawnObject2.CreateEnemy();	 
	}
}

function AddSpeed()
{
enemyBehavior.enemySpeed = newEnemySpeed;
newEnemySpeed += .01;
}
2

Let’s say you have a GameController Script with an ‘enemySpeedIncrease’ variable defined.

GameController → enemySpeedIncrease.

Now, from other scripts in the same scene, you can access this GameController Script as follows. Let’s say you have an Enemy object with an EnemyScript script. In EnemyScript…

EnemyScript (C# example)

using UnityEngine;
using System.Collections;

public class EnemyScript : MonoBehaviour {
	
	public float currentSpeed;
	public GameController GMC;
	
	// Use this for initialization
	void Start () {
		GMC = FindObjectOfType(typeof(GameController)) as GameController;
	}
	
	// Update is called once per frame
	void Update () {
		currentSpeed += GMC.enemySpeedIncrease;
		Debug.Log ("Enemy Speed is: " + currentSpeed);
	}
}

–
You see you have to give your 2nd script a reference to the first script, and load it with FindObjectOfType or a similar function.

Hopefully this helps!

Chris Vogel