1 + 1 / A

using System;
using System.Drawing;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;

namespace jedenplusjeden
{
    public partial class Form1 : Form
    {
        public double rozrzut = 10;
        public double wspp = 1.1;
        public int l_iteracji = 100;
        public double x = 0;
        public double y = 0;

        public Form1()
        {
            InitializeComponent();

        }

        public double ObliczY(double x)
        {
            return Math.Sin((double)x / 10) * Math.Sin((double)x / 200);
        }

        public void UstawXiY()
        {
            var random = new Random();
            x = random.Next(0, 100);
            y = ObliczY(x);
        }

        public void RysujLinie()
        {
            chart1.Series.Clear();
            var seria = new Series() { ChartType = SeriesChartType.Line };

            for (int x = 0; x < 101; x++)
            {
                var y = ObliczY(x);
                seria.Points.Add(new DataPoint(x, y));
            }

            chart1.Series.Add(seria);

            var seria2 = new Series() { ChartType = SeriesChartType.Point };
            chart1.Series.Add(seria2);
        }

        public void SzukajPunktu()
        {
            var random = new Random();
            var r = random.Next(Convert.ToInt32(rozrzut * -100), Convert.ToInt32(rozrzut * 100));
            var xPot = x + (double)r / 100;
            if (xPot > 100)
            {
                xPot -= rozrzut;
            }
            else if (xPot < 0)
            {
                xPot += rozrzut;
            }
            var yPot = ObliczY(xPot);
            if (yPot > y)
            {
                var point = new DataPoint(xPot, yPot) { Color = Color.Green };
                chart1.Series[1].Points.Add(point);
                rozrzut *= 1.1;

                x = xPot;
                y = yPot;
            }
            else
            {
                var point = new DataPoint(xPot, yPot) { Color = Color.Red };
                chart1.Series[1].Points.Add(point);
                rozrzut /= 1.1;
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            SzukajPunktow();
        }

        public async void SzukajPunktow()
        {
            RysujLinie();
            UstawXiY();

            for (int i = 0; i < 100; i++)
            {
                await Task.Delay(1000);
                SzukajPunktu();
                textBox1.Text = "Krok: " + (i + 1) + ". x-" + x + " y-" + y + " rozrzut-" + rozrzut;
            }
        }
    }
}