GFramework/GFramework.Godot/coroutine/GodotTimeSource.cs

using GFramework.Core.Abstractions.coroutine;

namespace GFramework.Godot.coroutine;

/// <summary>
/// Godot时间源实现，用于提供基于Godot引擎的时间信息
/// </summary>
/// <param name="getDeltaFunc">获取增量时间的函数委托</param>
public class GodotTimeSource(Func<double> getDeltaFunc) : ITimeSource
{
    private readonly Func<double> _getDeltaFunc = getDeltaFunc ?? throw new ArgumentNullException(nameof(getDeltaFunc));
    private double _currentTime;
    private double _deltaTime;

    /// <summary>
    /// 获取当前累计时间
    /// </summary>
    public double CurrentTime => _currentTime;

    /// <summary>
    /// 获取上一帧的时间增量
    /// </summary>
    public double DeltaTime => _deltaTime;

    /// <summary>
    /// 更新时间源，计算新的增量时间和累计时间
    /// </summary>
    public void Update()
    {
        // 调用外部提供的函数获取当前帧的时间增量
        _deltaTime = _getDeltaFunc();
        // 累加到总时间中
        _currentTime += _deltaTime;
    }

    /// <summary>
    /// 重置时间源到初始状态
    /// </summary>
    public void Reset()
    {
        _currentTime = 0;
        _deltaTime = 0;
    }
}