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 RysowanieMysza4
{
    public partial class Form1 : Form
    {
        Graphics g;
        int r;
        Color k;
        SolidBrush b;
        public Form1()
        {
            InitializeComponent();
            g = this.CreateGraphics();
            b = new SolidBrush(Color.White);
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void NumericUpDown1_ValueChanged(object sender, EventArgs e)
        {
            r = (int)numericUpDown1.Value;

        }

        private void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (listBox1.SelectedIndex == 0) k = Color.Red;
            if (listBox1.SelectedIndex == 1) k = Color.Green;
            if (listBox1.SelectedIndex == 2) k = Color.Blue;
            b.Color = k;

        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if(e.Button==MouseButtons.Left)
                g.FillEllipse(b, e.X-r/2, e.Y-r/2, r, r);
        }
    }
}