Delta-v/Content.Client/Movement/Systems/ContentEyeSystem.cs

using System.Numerics;
using Content.Shared.Movement.Components;
using Content.Shared.Movement.Systems;
using Robust.Client.Player;

namespace Content.Client.Movement.Systems;

public sealed class ContentEyeSystem : SharedContentEyeSystem
{
    [Dependency] private readonly IPlayerManager _player = default!;

    public void RequestZoom(EntityUid uid, Vector2 zoom, bool ignoreLimit, bool scalePvs, ContentEyeComponent? content = null)
    {
        if (!Resolve(uid, ref content, false))
            return;

        RaisePredictiveEvent(new RequestTargetZoomEvent()
        {
            TargetZoom = zoom,
            IgnoreLimit = ignoreLimit,
        });

        if (scalePvs)
            RequestPvsScale(Math.Max(zoom.X, zoom.Y));
    }

    public void RequestPvsScale(float scale)
    {
        RaiseNetworkEvent(new RequestPvsScaleEvent(scale));
    }

    public void RequestToggleFov()
    {
        if (_player.LocalEntity is { } player)
            RequestToggleFov(player);
    }

    public void RequestToggleFov(EntityUid uid, EyeComponent? eye = null)
    {
        if (Resolve(uid, ref eye, false))
            RequestEye(!eye.DrawFov, eye.DrawLight);
    }

    public void RequestToggleLight(EntityUid uid, EyeComponent? eye = null)
    {
        if (Resolve(uid, ref eye, false))
            RequestEye(eye.DrawFov, !eye.DrawLight);
    }


    public void RequestEye(bool drawFov, bool drawLight)
    {
        RaisePredictiveEvent(new RequestEyeEvent(drawFov, drawLight));
    }

    public override void FrameUpdate(float frameTime)
    {
        base.FrameUpdate(frameTime);
        var eyeEntities = AllEntityQuery<ContentEyeComponent, EyeComponent>();
        while (eyeEntities.MoveNext(out var entity, out ContentEyeComponent? contentComponent, out EyeComponent? eyeComponent))
        {
            UpdateEyeOffset((entity, eyeComponent));
            // ES START
            UpdateEyeRotation((entity, eyeComponent));
            // ES END
        }
    }

    public override void Update(float frameTime)
    {
        base.Update(frameTime);
        // TODO: Ideally we wouldn't want this to run in both FrameUpdate and Update, but we kind of have to since the visual update happens in FrameUpdate, but interaction update happens in Update. It's a workaround and a better solution should be found.
        var eyeEntities = AllEntityQuery<ContentEyeComponent, EyeComponent>();
        while (eyeEntities.MoveNext(out var entity, out ContentEyeComponent? contentComponent, out EyeComponent? eyeComponent))
        {
            UpdateEyeOffset((entity, eyeComponent));
            // ES START
            UpdateEyeRotation((entity, eyeComponent));
            // ES END
        }
    }
}