using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.Remoting.Messaging;

namespace opi_lab2
{
    public delegate double DoOperation(double a, double b);
    public class Solver
    {
        public static double DoCalc(double x)
        {
            double res = Math.Sqrt(6.0 * Math.Pow(x, 2) - 1);
            if (double.IsNaN(res))
            {
                return 0;
            }
            else return res;
        }

        public double Calculate(double a, double b)
        {
            double res = 0;
            for (double x = a; x <= b; x += 0.01)
            {
                res += DoCalc(x);
            }
            return res;
        }

        public static void CallBack(IAsyncResult ires)
        {
            AsyncResult ares = (AsyncResult)ires;
            DoOperation del = (DoOperation)(ares.AsyncDelegate);
            Form1 myForm = (Form1)ares.AsyncState;
            double result = del.EndInvoke(ires);
            myForm.textBoxRes.Invoke(new Action(
                    () =>
                    {
                        myForm.textBoxRes.Text = result.ToString();
                        myForm.buttonStart.Enabled = true;
                    }));
        }
    }
}