using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Drawing;
using System.IO;
using System.Globalization;
using System.Threading;

namespace WindowsFormsApplication1
{

    public partial class Form1 : Form
    {

        int scale = 15;
        public Form1()

        {
            InitializeComponent();
        }

        StreamReader file = new StreamReader("D:\\zadanie.txt");
        private void panel1_Paint(object sender, PaintEventArgs e)

        {

            Thread.CurrentThread.CurrentUICulture = CultureInfo.GetCultureInfo("en-US");
            Thread.CurrentThread.CurrentCulture = CultureInfo.GetCultureInfo("en-US");

            e.Graphics.DrawLine(Pens.BlueViolet, panel1.Width / 2, 0, panel1.Width / 2, panel1.Height); //os y
            e.Graphics.DrawLine(Pens.BlueViolet, 0, panel1.Height / 2, panel1.Width, panel1.Height / 2); //os x
            Point absZero = new Point(panel1.Width / 2, panel1.Height / 2);
            int i = absZero.X;
            while (i < panel1.Width)

            {
                i += scale;
                e.Graphics.DrawLine(Pens.BlueViolet, i, absZero.Y - 4, i, absZero.Y + 4);
            }

            //Point absZero = new Point(panel1.Width / 2, panel1.Height / 2);
            e.Graphics.DrawLine(Pens.BlueViolet, absZero.X, 0, absZero.X, panel1.Height);
            e.Graphics.DrawLine(Pens.BlueViolet, 0, absZero.Y, 0, absZero.Y);
            //int i = absZero.X;
            while (i < panel1.Width)

            {
                i += scale;
                e.Graphics.DrawLine(Pens.BlueViolet, i, absZero.Y - 4, i, absZero.Y + 4);
            }

            i = absZero.X;
            while (i > 0)

            {
                i -= scale;
                e.Graphics.DrawLine(Pens.BlueViolet, i, absZero.Y - 4, i, absZero.Y + 4);
            }

            i = absZero.Y;
            while (i < panel1.Height)

            {
                i += scale;
                e.Graphics.DrawLine(Pens.BlueViolet, absZero.X - 4, i, absZero.X + 4, i);
            }
            i = absZero.Y;
            while (i > 0)

            {

                i -= scale;
                e.Graphics.DrawLine(Pens.BlueViolet, absZero.X - 4, i, absZero.X + 4, i);

            }

            String line;
            float X ;
            float Y ;

            while ((line = file.ReadLine()) != null)
            {
                X = float.Parse(line.Split(' ')[0]);
                Y = float.Parse(line.Split(' ')[1]);
                e.Graphics.FillEllipse(Brushes.Red, (absZero.X + (X * scale)) - 2, (absZero.Y - (Y * scale)) - 2, 4, 4);
            }
        }
    }
}