QuaternionInterpolated.cs

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See LICENSE in the project root for license information.

using System;
using UnityEngine;

namespace HoloToolkit.Unity
{
    [Serializable]
    public class QuaternionInterpolated
    {
        public float DeltaSpeed = 360f;

        public Quaternion Value { get; private set; }
        public Quaternion TargetValue { get; private set; }
        public Quaternion StartValue { get; private set; }
        public float Duration { get; private set; }
        public float Counter { get; private set; }

        public QuaternionInterpolated()
        {
            Reset(Quaternion.identity);
        }

        public QuaternionInterpolated(Quaternion initialValue)
        {
            Reset(initialValue);
        }

        public void Reset(Quaternion value)
        {
            Value = value;
            TargetValue = value;
            StartValue = value;
            Duration = 0f;
            Counter = 0f;
        }

        public void SetTarget(Quaternion targetValue)
        {
            TargetValue = targetValue;
            StartValue = Value;
            Duration = Quaternion.Angle(StartValue, TargetValue) / DeltaSpeed;
            Counter = 0f;
        }

        public bool HasUpdate()
        {
            return Quaternion.Angle(TargetValue, Value) > 0.05f;
        }

        public Quaternion GetUpdate(float deltaTime)
        {
            Counter += deltaTime;
            Value = Quaternion.Slerp(StartValue, TargetValue, Counter / Duration);

            return Value;
        }
    }
}