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数値をカウントアップさせる時によくやる処理
using UnityEngine;
using System;
using UniRx;
using UniRx.Triggers;
public class CountUpStream
{
/// <summary>
/// カウントアップストリームの作成
/// </summary>
/// <param name="start">開始値</param>
/// <param name="end">終了値</param>
/// <param name="addMin">最小足し込み量</param>
/// <param name="minSecPerAdd">足し込み間隔</param>
/// <param name="maxSec">Max sec.</param>
public static IObservable<long> Create(long start, long end, long addMin, float intervalSec, float maxSec)
{
// 総足し込み量
var revise = Mathf.Max(addMin, end - start);
// 所要時間
var time = Mathf.Min(maxSec, (float)revise / addMin * intervalSec);
// 1回あたりの足し込み量
var add = (long)Math.Ceiling(revise / (time / intervalSec));
// 総回数(startの値と、endの値を流すため+2)
var totalCount = 2 + (int)(revise / add);
Debug.Log("### カウントアップ処理 " + start + " から " + end + " まで, " + intervalSec + " 秒間隔で " + time + " 秒かけて " + add + " ずつ増やしていく。回数:" + totalCount);
return Observable.Interval(TimeSpan.FromSeconds(intervalSec))
.Select(_ => 1)
.Scan((a, b) => a + b)
.Take(totalCount)
.Select(cnt => Math.Min(end, start + add * (cnt - 1)));
}
}
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