Нарисовать светофор, в котором цвет «зажигается» при нажатии на эту лампу левой клавишей мыши

private void MainForm_Paint(object sender, PaintEventArgs e)
{
    e.Graphics.DrawEllipse(System.Drawing.Pens.Black, new System.Drawing.Rectangle(50, 50, 30, 30));
}

using System.Drawing;
using System.Windows.Forms;
 
namespace ForumWinforms
{
    public partial class Form1 : Form
    {
        private Lamp[] _lamps;
        private int _lampSize;
        public Form1()
        {
            InitializeComponent();
 
            _lampSize = 50;
 
            Lamp red = new Lamp(Color.Red, Color.LightGray, new Rectangle(0, 0, _lampSize, _lampSize));
            Lamp yellow = new Lamp(Color.Yellow, Color.LightGray, new Rectangle(0, _lampSize, _lampSize, _lampSize));
            Lamp green = new Lamp(Color.Green, Color.LightGray, new Rectangle(0, _lampSize * 2, _lampSize, _lampSize));
 
            _lamps = new Lamp[3] { red, yellow, green };
 
            Paint += Form1_Paint;
            MouseDown += Form1_MouseDown;
 
        }
 
        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                foreach (Lamp lamp in _lamps)
                {
                    lamp.isOn = lamp.rectangle.Contains(e.Location);
                }
 
                Invalidate();
            }
        }
 
        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            foreach (Lamp lamp in _lamps)
            {
                lamp.Draw(e.Graphics);
            }
        }
    }
 
    public class Lamp
    {
        public Color colorOn;
        public Color colorOff;
        public Rectangle rectangle;
 
        public bool isOn;
        public Lamp(Color colorOn, Color colorOff, Rectangle rect)
        {
            this.colorOn = colorOn;
            this.colorOff = colorOff;
            this.rectangle = rect;
        }
 
        public void Draw(Graphics g)
        {
            using (SolidBrush brush = new SolidBrush(isOn ? colorOn : colorOff))
            {
                g.FillEllipse(brush, rectangle);
            }
        }
    }
}

private void button1_Paint(object sender, PaintEventArgs e)
{
    GraphicsPath myPath = new GraphicsPath();
    Rectangle newRectangle = button1.ClientRectangle;
    newRectangle.Inflate(-10, -10);
    e.Graphics.DrawEllipse(Pens.Gray, newRectangle);
    newRectangle.Inflate(1, 1);
    myPath.AddEllipse(newRectangle);
    Region myRegion = new Region(myPath);
    button1.Region = myRegion;
}
 
private void button2_Paint(object sender, PaintEventArgs e)
{
    GraphicsPath myPath = new GraphicsPath();
    Rectangle newRectangle = button2.ClientRectangle;
    newRectangle.Inflate(-10, -10);
    e.Graphics.DrawEllipse(Pens.Gray, newRectangle);
    newRectangle.Inflate(1, 1);
    myPath.AddEllipse(newRectangle);
    Region myRegion = new Region(myPath);
    button2.Region = myRegion;
}
 
private void button3_Paint(object sender, PaintEventArgs e)
{
    GraphicsPath myPath = new GraphicsPath();
    Rectangle newRectangle = button3.ClientRectangle;
    newRectangle.Inflate(-10, -10);
    e.Graphics.DrawEllipse(Pens.Gray, newRectangle);
    newRectangle.Inflate(1, 1);
    myPath.AddEllipse(newRectangle);
    Region myRegion = new Region(myPath);
    button3.Region = myRegion;
}
 
private void button1_Click(object sender, EventArgs e)
{
    button1.BackColor = Color.Red;
    button2.BackColor = Color.Gray;
    button3.BackColor = Color.Gray;
}
 
private void button2_Click(object sender, EventArgs e)
{
    button2.BackColor = Color.Yellow;
    button1.BackColor = Color.Gray;
    button3.BackColor = Color.Gray;
}
 
private void button3_Click(object sender, EventArgs e)
{
    button3.BackColor = Color.Green;
    button2.BackColor = Color.Gray;
    button1.BackColor = Color.Gray;
}
 
private void Form1_Click(object sender, EventArgs e)
{
    button1.BackColor = Color.Gray;
    button2.BackColor = Color.Gray;
    button3.BackColor = Color.Gray;
}
 
private void Form1_Paint(object sender, PaintEventArgs e)
{
    Graphics rect = CreateGraphics();
    Pen pen = new Pen(Brushes.DarkGray);
    rect.DrawRectangle(pen, 70, 20, 85, 225);
}