c#ランダムウォーク

Form1.cs

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            Label label = new Label();
            label.Text = "Hello, World!";
            label.Font = new Font("Verdana", 20, FontStyle.Regular);
            label.Height = 30;
            label.Width = 300;
            this.Controls.Add(label);

            Bitmap canvas = new Bitmap(pictureBox1.Width, pictureBox1.Height);
            Graphics g = Graphics.FromImage(canvas);

            double px = 150, py = 150;
            Random random = new System.Random();
            for (int i = 0; i < 1000; i++)
            {
                double x = 2 * random.NextDouble() - 1;
                double y = 2 * random.NextDouble() - 1;
                double r = Math.Sqrt(x * x + y * y);
                x *= 3 / r;
                y *= 3 / r;
                g.DrawLine(Pens.Black, (float)px, (float)py, (float)(px + x), (float)(py + y));
                px += x;
                py += y;
            }
            g.Dispose();
            pictureBox1.Image = canvas;
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}