wwdpublic/Content.Client/_White/UI/BarControl.cs

using Content.Client.Weapons.Ranged.ItemStatus;
using Robust.Client.Graphics;
using Robust.Client.UserInterface;
using Robust.Shared.Utility;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Threading.Tasks;

namespace Content.Client._White.UI;

public sealed class BarControl : Control
{
    private float _fill;
    public float Fill
    {
        get => _fill;
        set
        {
            DebugTools.Assert(value is >= 0 and <= 1);
            _fill = value;
        }
    }
    public float Percentage
    {
        get => _fill * 100f;
        set => Fill = value / 100;
    }
    private int _rows = 1;
    public int Rows { get => _rows; set { DebugTools.Assert(value > 0); _rows = value; } }

    public Color FillColor = Color.Red;
    public Color EmptyColor = Color.DarkRed;
    public Color AltFillColor = Color.InterpolateBetween(Color.Red, Color.Black, 0.125f);
    public Color AltEmptyColor = Color.InterpolateBetween(Color.DarkRed, Color.Black, 0.075f);

    protected override void Draw(DrawingHandleScreen handle)
    {
        // Scale rendering in this control by UIScale.
        var currentTransform = handle.GetTransform();
        handle.SetTransform(Matrix3Helpers.CreateScale(new Vector2(UIScale)) * currentTransform);

        //var countPerRow = CountPerRow(Size.X);


        float fillLeft = _fill * _rows;
        float rowHeight = Size.Y / _rows;
        // Draw by rows, bottom to top.
        bool alt = false;
        for (var row = _rows - 1; row >= 0; row--)
        {
            Color fill = alt ? FillColor : AltFillColor;
            Color empty = alt ? EmptyColor : AltEmptyColor;
            float rowFill = MathF.Min(fillLeft, 1);
            fillLeft -= 1;
            Vector2 topLeft = Position + new Vector2(0, rowHeight * row);
            Vector2 bottomRight = topLeft + new Vector2(Size.X, Size.Y / _rows);
            
            handle.DrawRect(new UIBox2(topLeft, bottomRight), empty);
            if(rowFill > 0)
                handle.DrawRect(new UIBox2(topLeft + new Vector2(Size.X * (1 - rowFill), 0), bottomRight), fill);
            alt = !alt;
        }
    }

    protected override Vector2 MeasureOverride(Vector2 availableSize) => availableSize;
}