using UnityEngine;
using System.Collections;
public class EnemySpawner : MonoBehaviour {
public GameObject enemyPrefab;
public int width = 10;
public int hight = 5;
public int speed = 4;
float xmin, xmax;
// Use this for initialization
void Start () {
foreach(Transform child in transform)
{
GameObject enemy = Instantiate(enemyPrefab, child.transform.position, Quaternion.identity) as GameObject;
enemy.transform.parent = child;
}
CalculateBoundaries();
}
public void OnDrawGizmos()
{
Gizmos.DrawWireCube(transform.position, new Vector3(width, hight));
}
void FixedUpdate()
{
if (transform.position.x <= xmin || transform.position.x >= xmax)
{
speed *= -1;
}
transform.position += Vector3.left * speed * Time.deltaTime;
}
void CalculateBoundaries()
{
float dist = transform.position.z - Camera.main.transform.position.z;
Vector3 leftmost = Camera.main.ViewportToWorldPoint(new Vector3(0, 0, dist));
Vector3 rightmost = Camera.main.ViewportToWorldPoint(new Vector3(1, 0, dist));
xmin = leftmost.x + width / 2 + 0.5f;
xmax = rightmost.x - width / 2 - 0.5f;
}
}