LinearAudioPitch.cs

//======= Copyright (c) Valve Corporation, All rights reserved. ===============
//
// Purpose: Changes the pitch of this audio source based on a linear mapping
//          and a curve
//
//=============================================================================

using UnityEngine;
using System.Collections;

namespace Valve.VR.InteractionSystem
{
    //-------------------------------------------------------------------------
    public class LinearAudioPitch : MonoBehaviour
    {
        public LinearMapping linearMapping;
        public AnimationCurve pitchCurve;
        public float minPitch;
        public float maxPitch;
        public bool applyContinuously = true;

        private AudioSource audioSource;

    
        //-------------------------------------------------
        void Awake()
        {
            if ( audioSource == null )
            {
                audioSource = GetComponent<AudioSource>();
            }

            if ( linearMapping == null )
            {
                linearMapping = GetComponent<LinearMapping>();
            }
        }


        //-------------------------------------------------
        void Update()
        {
            if ( applyContinuously )
            {
                Apply();
            }
        }


        //-------------------------------------------------
        private void Apply()
        {
            float y = pitchCurve.Evaluate( linearMapping.value );

            audioSource.pitch = Mathf.Lerp( minPitch, maxPitch, y );
        }
    }
}