AppExperiments

/******************************************************************************
 * Copyright (C) Leap Motion, Inc. 2011-2018.                                 *
 * Leap Motion proprietary and confidential.                                  *
 *                                                                            *
 * Use subject to the terms of the Leap Motion SDK Agreement available at     *
 * https://developer.leapmotion.com/sdk_agreement, or another agreement       *
 * between Leap Motion and you, your company or other organization.           *
 ******************************************************************************/

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

namespace Leap.Unity.InputModule {
  public class ScrollRectVolume : MonoBehaviour {
    public AudioSource source;
    public RectTransform content;
    public float Volume = 1f;
    RectTransform viewport;
    float volumeScalar = 0f;
    Vector2 currentPos = Vector3.zero;
    Vector2 prevPos = Vector3.zero;
    Vector2 viewportScale;
    float TimeLastSlid = 0f;

    void Start() {
      viewport = content.parent.GetComponent<RectTransform>();
      viewportScale = new Vector2(viewport.rect.size.x, viewport.rect.size.y);
    }

    void Update() {
      Vector2 localPos = new Vector2(content.localPosition.x, content.localPosition.y);
      localPos = new Vector2(localPos.x / viewportScale.x, localPos.y / viewportScale.y);

      if (localPos != currentPos) {
        prevPos = currentPos;
        currentPos = localPos;

        volumeScalar = Mathf.Lerp(volumeScalar, Mathf.Abs((currentPos - prevPos).magnitude) * 40f, 0.4f);

        source.volume = Mathf.Clamp(volumeScalar * Volume, 0f, Volume);

        if (!source.isPlaying) {
          source.Play();
        }

        TimeLastSlid = Time.time;
      } else {
        if (Time.time - TimeLastSlid > Time.deltaTime * 5f) {
          source.Stop();
        } else {
          volumeScalar = Mathf.Lerp(volumeScalar, 0f, 0.4f);
          source.volume = volumeScalar * Volume;
        }
      }
    }
  }
}