tbd-station-14/Content.Server/GameObjects/Components/Projectiles/FlashProjectileComponent.cs

using Content.Server.GameObjects.Components.Weapon;
using Robust.Shared.GameObjects;
using Robust.Shared.Serialization.Manager.Attributes;
using Robust.Shared.Physics;
using Robust.Shared.Physics.Collision;
using Robust.Shared.Physics.Dynamics;
using Robust.Shared.Serialization;

namespace Content.Server.GameObjects.Components.Projectiles
{
    /// <summary>
    /// Upon colliding with an object this will flash in an area around it
    /// </summary>
    [RegisterComponent]
    public class FlashProjectileComponent : Component, IStartCollide
    {
        public override string Name => "FlashProjectile";

        [DataField("range")]
        private float _range = 1.0f;
        [DataField("duration")]
        private float _duration = 8.0f;

        private bool _flashed;

        public override void Initialize()
        {
            base.Initialize();
            // Shouldn't be using this without a ProjectileComponent because it will just immediately collide with thrower
            Owner.EnsureComponent<ProjectileComponent>();
        }

        void IStartCollide.CollideWith(Fixture ourFixture, Fixture otherFixture, in Manifold manifold)
        {
            if (_flashed) return;

            FlashableComponent.FlashAreaHelper(Owner, _range, _duration);
            _flashed = true;
        }
    }
}