Animation Clip scaler

AnimationClipScalerWindow.cs

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

/// <summary>
/// Made by Rodrigo Diaz
/// http://www.goldenfrogstudios.com/
/// This code is licensed under MIT license
/// 
/// Make sure to add this class under a folder named "Editor" in the Unity Project
/// </summary>

public class AnimationClipScalerWindow : EditorWindow
{
    private float scale;
    private AnimationClip clip;
    private bool tangentScale;

    // Add menu item named "My Window" to the Window menu
    [MenuItem("Window/Animation Clip Scaler")]
    public static void ShowWindow()
    {
        //Show existing window instance. If one doesn't exist, make one.
        EditorWindow.GetWindow(typeof(AnimationClipScalerWindow));
    }

    void OnGUI()
    {
        GUILayout.Label("Clip", EditorStyles.boldLabel);
        clip = (AnimationClip)EditorGUILayout.ObjectField(clip, typeof(AnimationClip), false);
        tangentScale = GUILayout.Toggle(tangentScale, "Scale tangents");
        scale = EditorGUILayout.FloatField("Scale", scale);

        GUI.enabled = clip != null;
        if (GUILayout.Button("Scale"))
        {
            Undo.RecordObject(clip, "Animation scaled");
            ScaleAudioClip();

        }
        GUI.enabled = true;
    }

    void ScaleAudioClip()
    {
        EditorCurveBinding[] data = AnimationUtility.GetCurveBindings(clip);

        foreach (EditorCurveBinding b in data)
        {
            AnimationCurve curve = AnimationUtility.GetEditorCurve(clip, b);
            List<Keyframe> keys = new List<Keyframe>();
            AnimationCurve newCurve = new AnimationCurve();
            foreach (Keyframe oldKey in curve.keys)
            {
                Keyframe key = oldKey;
                key.time *= scale;
                if (tangentScale)
                {
                    key.inTangent = ScaleTangent(key.inTangent);
                    key.outTangent = ScaleTangent(key.outTangent);
                }
                newCurve.AddKey(key);
            }
            AnimationUtility.SetEditorCurve(clip, b, newCurve);
        }
    }

    // Calculates new tangent based on the time offset
    private float ScaleTangent(float tangent)
    {
        float x = Mathf.Cos(tangent) * scale;
        float y = Mathf.Sin(tangent);

        return Mathf.Atan2(y, x);
    }
}