Vector3Interpolated.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 UnityEngine;

namespace HoloToolkit.Unity
{
    public class Vector3Interpolated
    {
        public float HalfLife = 0.08f;

        public Vector3 Value { get; private set; }
        public Vector3 TargetValue { get; private set; }

        public Vector3Interpolated()
        {
            Reset(Vector3.zero);
        }

        public Vector3Interpolated(Vector3 initialValue)
        {
            Reset(initialValue);
        }

        public void Reset(Vector3 value)
        {
            Value = value;
            TargetValue = value;
        }

        public void SetTarget(Vector3 targetValue)
        {
            TargetValue = targetValue;
        }

        public bool HasUpdate()
        {
            return TargetValue != Value;
        }

        public Vector3 GetUpdate(float deltaTime)
        {
            Vector3 distance = (TargetValue - Value);

            if (distance.sqrMagnitude <= Mathf.Epsilon)
            {
                // When close enough, jump to the target
                Value = TargetValue;
            }
            else
            {
                Value = InterpolationUtilities.ExpDecay(Value, TargetValue, HalfLife, deltaTime);
            }


            return Value;
        }
    }
}