using UnityEngine;
using System.Collections;

public static class _Time
{
    private static int iLastFrame = 0;
    private static float fLastTime = 0.0f;
    private static float fDeltaTime = 0.0f;

    // 初期化：Start() で実行
    public static void StartDeltaTime()
    {
        fLastTime = Time.realtimeSinceStartup;
        iLastFrame = Time.frameCount;
    }

    // 更新：Update() で実行
    public static void UpdateDeltaTime()
    {
        int iCurrentFrame = Time.frameCount;
        if (iCurrentFrame != iLastFrame)
        {
            float fCurrentTime = Time.realtimeSinceStartup;
            fDeltaTime = fCurrentTime - fLastTime;
            fLastTime = fCurrentTime;
            iLastFrame = iCurrentFrame;
        }
    }

    // 取得：Time.deltaTime を _Time.deltaTime に置き換えて使用する
    public static float deltaTime
    {
        get {
            if (Time.timeScale == 0) return fDeltaTime;
            else return Time.deltaTime;
        }
    }
}