using System;
using System.Windows.Forms;

namespace Equalation
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private delegate double[] Funck(double a, double b, double step);

        private Funck handler;

        private IAsyncResult thred;

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        double[] FuncEq(double a, double b, double step)
        {
            int len = (int)((b - a) / step);
            var res = new double[len];
            for(var i = 0; i < res.Length; i++)
            {
                var x = a + step * i;
                res[i] = 4 * x;
                System.Threading.Thread.Sleep(100);
            }
            return res;
        }

        private void start_Click(object sender, EventArgs e)
        {
            handler = new Funck(FuncEq);
            thred = handler.BeginInvoke(0, 10, 0.1, null, null);
            start.Enabled = false;
            timer.Start();
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            if (thred.IsCompleted)
            {
                var res = handler.EndInvoke(thred);

                for(var i = 0; i < res.Length; i++)
                {
                    resultLabel.Text += res[i].ToString() + "\n";
                }
                timer.Stop();
                start.Enabled = true;
            }
        }
    }
}