Delta-v/Content.Client/_Floof/OfferItem/OfferItemIndicatorsOverlay.cs

using System.Numerics;
using Robust.Client.GameObjects;
using Robust.Client.Graphics;
using Robust.Client.Input;
using Robust.Client.UserInterface;
using Robust.Shared.Enums;
using Robust.Shared.Utility;

namespace Content.Client._Floof.OfferItem;

public sealed class OfferItemIndicatorsOverlay : Overlay
{
    private readonly IInputManager _inputManager;
    private readonly IEntityManager _entMan;
    private readonly IEyeManager _eye;
    private readonly OfferItemSystem _offer;

    private readonly Texture _sight;

    public override OverlaySpace Space => OverlaySpace.ScreenSpace;

    private readonly Color _mainColor = Color.White.WithAlpha(0.3f);
    private readonly Color _strokeColor = Color.Black.WithAlpha(0.5f);
    private readonly float _scale = 0.6f;  // 1 is a little big

    public OfferItemIndicatorsOverlay(IInputManager input, IEntityManager entMan,
            IEyeManager eye, OfferItemSystem offerSys)
    {
        _inputManager = input;
        _entMan = entMan;
        _eye = eye;
        _offer = offerSys;

        var spriteSys = _entMan.EntitySysManager.GetEntitySystem<SpriteSystem>();
        _sight = spriteSys.Frame0(new SpriteSpecifier.Rsi(new("/Textures/_Floof/Interface/Misc/give_item.rsi"), "give_item"));
    }

    protected override bool BeforeDraw(in OverlayDrawArgs args)
    {
        if (!_offer.IsInOfferMode())
            return false;

        return base.BeforeDraw(in args);
    }

    protected override void Draw(in OverlayDrawArgs args)
    {
        var mouseScreenPosition = _inputManager.MouseScreenPosition;
        var mousePosMap = _eye.PixelToMap(mouseScreenPosition);
        if (mousePosMap.MapId != args.MapId)
            return;


        var mousePos = mouseScreenPosition.Position;
        var uiScale = (args.ViewportControl as Control)?.UIScale ?? 1f;
        var limitedScale = uiScale > 1.25f ? 1.25f : uiScale;

        DrawSight(_sight, args.ScreenHandle, mousePos, limitedScale * _scale);
    }

    private void DrawSight(Texture sight, DrawingHandleScreen screen, Vector2 centerPos, float scale)
    {
        var sightSize = sight.Size * scale;
        var expandedSize = sightSize + new Vector2(7f, 7f);

        screen.DrawTextureRect(sight,
            UIBox2.FromDimensions(centerPos - sightSize * 0.5f, sightSize), _strokeColor);
        screen.DrawTextureRect(sight,
            UIBox2.FromDimensions(centerPos - expandedSize * 0.5f, expandedSize), _mainColor);
    }
}