using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ParticleTarget : MonoBehaviour {


    [SerializeField]
    private Transform target;

    [SerializeField]
    private float force = 10.0f;

    private ParticleSystem ps;

	// Use this for initialization
	void Start () {
        ps = GetComponent<ParticleSystem>();
	}

	// Update is called once per frame
	void Update () {

	}

    private void LateUpdate()
    {
        ParticleSystem.Particle[] particles = new ParticleSystem.Particle[ps.particleCount];
        ps.GetParticles(particles);



        for(int i = 0; i < particles.Length; i++)
        {
            ParticleSystem.Particle p = particles[i];
            Vector3 particleWorldPs;
            if(ps.main.simulationSpace == ParticleSystemSimulationSpace.Local)
            {
                particleWorldPs = transform.TransformPoint(p.position);
            }
            else
            {
                particleWorldPs = p.position;
            }
            p.velocity += (target.position - particleWorldPs).normalized * Time.deltaTime * force;
            particles[i] = p;
        }

        ps.SetParticles(particles, particles.Length);
    }
}