SlideshowParticles.cs

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

[RequireComponent(typeof(ChaoticParticles))]
[RequireComponent(typeof(ParticleSystem))]
public class SlideshowParticles : MonoBehaviour {

    public int timer = 15; 

    public GameObject cameraBoom;
    public float spinRate = 0.2f;

    public Text slideLabel;

    private float nextSlideTime; 

    private int currentSlide = 0; 
    private int maxSlide; 
    private List<ChaosEqn> eqns;
    private string[] eqnNames;

    private ChaoticParticles chaoticParticles;
    private ParticleSystem particleSys;

    private Quaternion initialRotation;

    public float speedTrim = 1.0f;

    // Use this for initialization
    void Start () {
        nextSlideTime = Time.time + timer;
        eqns = ChaosEqnFactory.GetEquations();
        maxSlide = eqns.Count;
        eqnNames = new string[maxSlide];
        int index = 0; 
        foreach (ChaosEqn eqn in eqns) {
            eqnNames[index] = eqn.GetName();
            index++;
        }
        chaoticParticles = GetComponent<ChaoticParticles>();
        chaoticParticles.selectedEqn = currentSlide;
        slideLabel.text = eqnNames[currentSlide];
        chaoticParticles.timeZoom = eqns[currentSlide].GetSlideshowSpeed()*speedTrim;
        chaoticParticles.Init();
        particleSys = GetComponent<ParticleSystem>();

        initialRotation = transform.rotation;

    }
    
    // Update is called once per frame
    void Update () {
        if (Time.time > nextSlideTime) {
            nextSlideTime = Time.time + timer;
            NextSlide(true);

        } else {
            if (Time.time < (nextSlideTime - timer/2f)) {
                cameraBoom.transform.rotation *= Quaternion.AngleAxis( spinRate, Vector3.up);
            } else {
                cameraBoom.transform.rotation *= Quaternion.AngleAxis( spinRate, Vector3.right);
            }

        }
        // press "N" for next slide, "P" for previous
        if (Input.GetKeyUp(KeyCode.N)) {
            NextSlide(true);
        } else if (Input.GetKeyUp(KeyCode.P)) {
            NextSlide(false);
        }

    }

    private void NextSlide(bool advance) {
        if (advance) {
            currentSlide++;
            if (currentSlide >= maxSlide) {
                currentSlide = 0; 
            }
        } else {
            currentSlide--;
            if (currentSlide < 0) {
                currentSlide = maxSlide-1; 
            }
        }
        Debug.Log(eqnNames[currentSlide]);
        chaoticParticles.selectedEqn = currentSlide;
        slideLabel.text = eqnNames[currentSlide];
        // restart particle system
        particleSys.Clear();
        particleSys.Play();

        // re-center position/camera
        transform.position = Vector3.zero;
        cameraBoom.transform.rotation = initialRotation;
        chaoticParticles.timeZoom = eqns[currentSlide].GetSlideshowSpeed()*speedTrim;
        chaoticParticles.Init();

    }
}