Project_Junker/unity_Project/Assets/Scripts/musicController.cs

using UnityEngine;
using System.Collections;

public class musicController : MonoBehaviour {

	public AudioClip startMusic;
	public AudioClip endMusic;

	private AudioSource source;
	private bool triggered = false;

	void Awake(){
		source = GetComponent<AudioSource> ();
	}

	// Use this for initialization
	void Start () {
		source.clip = startMusic;
	}
	
	// Update is called once per frame
	void Update () {
		if (Input.GetKeyDown (KeyCode.Equals)) {
			source.volume += 0.1f;
		}
		if (Input.GetKeyDown (KeyCode.Minus)) {
			source.volume -= 0.1f;
		}
	
	}

	IEnumerator fadeOut (float end, float steps){

		Debug.Log ("Volume: " + source.volume);
		float curVol = source.volume;
		while(source.volume > end + steps)
		{
			source.volume -= steps * Time.deltaTime;
			Debug.Log ("Volume: " + source.volume);
			yield return new WaitForSeconds(0.01f);
		}
		source.volume = end;
		source.clip = endMusic;
		source.Play();
		StartCoroutine (fadeIn (curVol, 0.2f));
		yield return null;
	}

	IEnumerator fadeIn (float end, float steps){

		while(source.volume <end - steps)
		{
			source.volume += steps * Time.deltaTime;
			yield return new WaitForSeconds(0.01f);
		}
		source.volume = end;
		yield return null;
	}

	void OnTriggerEnter(Collider other) {
		Debug.Log ("Music Change");

		if (triggered)
			return;
		if (other.transform.tag != "Player")
			return;

		StartCoroutine (fadeOut (0.0f, 0.2f));
		//fadeIn (1.0f, 0.01f);
		triggered = true;
	}

}