zeruwa

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace kolos_0_termin
{
    public partial class Form1 : Form
    {
        List<Kulka> kulki = new List<Kulka>();
        Pen pioro = new Pen(Color.Black, 10);
        Pen first = new Pen(Color.Red, 10);
        public bool hold = false;

        public Form1()
        {
            InitializeComponent();
        }

        private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            Kulka nowa = new Kulka(e.X, e.Y);
            kulki.Add(nowa);
            if (kulki.Count >= 20 && hold == false)
            {
                kulki.RemoveAt(0);
                panel1.Refresh();
            }
            panel1.Refresh();
        }

        class Kulka
        {
            public int kx;
            public int ky;

            public Kulka(int x, int y)
            {
                kx = x;
                ky = y;
            }
        }

        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            g.DrawEllipse(first, kulki[0].kx, kulki[0].ky, 5, 5);
            for (int i = 1; i < kulki.Count; i++)
            {
                g.DrawEllipse(pioro, kulki[i].kx,kulki[i].ky,5, 5);
            }
        }

        private void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            hold = true;
        }

        private void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            hold = false;
        }
    }
}