civ14/Content.Server/Shuttles/Systems/ShuttleSystem.Impact.cs

using System.Numerics;
using Content.Server.Shuttles.Components;
using Content.Shared.Audio;
using Robust.Shared.Audio;
using Robust.Shared.Map;
using Robust.Shared.Physics.Dynamics;
using Robust.Shared.Physics.Events;
using Robust.Shared.Player;

namespace Content.Server.Shuttles.Systems;

public sealed partial class ShuttleSystem
{
    /// <summary>
    /// Minimum velocity difference between 2 bodies for a shuttle "impact" to occur.
    /// </summary>
    private const int MinimumImpactVelocity = 10;

    private readonly SoundCollectionSpecifier _shuttleImpactSound = new("ShuttleImpactSound");

    private void InitializeImpact()
    {
        SubscribeLocalEvent<ShuttleComponent, StartCollideEvent>(OnShuttleCollide);
    }

    private void OnShuttleCollide(EntityUid uid, ShuttleComponent component, ref StartCollideEvent args)
    {
        if (!HasComp<ShuttleComponent>(args.OtherEntity))
            return;

        var ourBody = args.OurBody;
        var otherBody = args.OtherBody;

        // TODO: Would also be nice to have a continuous sound for scraping.
        var ourXform = Transform(uid);

        if (ourXform.MapUid == null)
            return;

        var otherXform = Transform(args.OtherEntity);

        var ourPoint = Vector2.Transform(args.WorldPoint, _transform.GetInvWorldMatrix(ourXform));
        var otherPoint = Vector2.Transform(args.WorldPoint, _transform.GetInvWorldMatrix(otherXform));

        var ourVelocity = _physics.GetLinearVelocity(uid, ourPoint, ourBody, ourXform);
        var otherVelocity = _physics.GetLinearVelocity(args.OtherEntity, otherPoint, otherBody, otherXform);
        var jungleDiff = (ourVelocity - otherVelocity).Length();

        if (jungleDiff < MinimumImpactVelocity)
        {
            return;
        }

        var coordinates = new EntityCoordinates(ourXform.MapUid.Value, args.WorldPoint);
        var volume = MathF.Min(10f, 1f * MathF.Pow(jungleDiff, 0.5f) - 5f);
        var audioParams = AudioParams.Default.WithVariation(SharedContentAudioSystem.DefaultVariation).WithVolume(volume);

        _audio.PlayPvs(_shuttleImpactSound, coordinates, audioParams);
    }
}