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 _11._03._19
{
    public partial class Form1 : Form
    {
        private System.Drawing.Graphics g;
        private System.Drawing.Pen pen1 = new System.Drawing.Pen(Color.Red, 3);

        public Form1()
        {

            InitializeComponent();
            g = pictureBox1.CreateGraphics();

        }

    private void button1_Click(object sender, EventArgs e)
        {
            double x=0;
            double y=0;
            double r;
            double n;
            double alfa = 0;
            Double.TryParse(textBox1.Text, out n);
            Double.TryParse(textBox2.Text, out r);
            double przyrost_alfa=(2*Math.PI)/n;

            double x0 = r * Math.Cos(przyrost_alfa);
            double y0 = r * Math.Sin(przyrost_alfa);

            pictureBox1.Refresh();
            for (int i = 0; i <= n; i++)
            {

                alfa = alfa + przyrost_alfa;

                x = r * Math.Cos(alfa);
                y = r * Math.Sin(alfa);
                g.DrawLine(pen1, (float)x0+pictureBox1.Width/2, (float)y0+pictureBox1.Height / 2, (float)x + pictureBox1.Width / 2, (float)y + pictureBox1.Height / 2);

                x0 = x;
                y0 = y;

            }
            
        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            double x = 0;
            double y = 0;
            double r;
            double n;
            double alfa=0;
            Double.TryParse(textBox1.Text, out n);
            Double.TryParse(textBox2.Text, out r);
            
            double przyrost_alfa;
            Double.TryParse(textBox1.Text, out przyrost_alfa);
            double x0 = r * Math.Cos(przyrost_alfa);
            double y0 = r * Math.Sin(przyrost_alfa);

            pictureBox1.Refresh();
            for (int i = 0; i <= n; i++)
            {

                alfa = alfa + przyrost_alfa;

                x = r * Math.Cos(alfa);
                y = r * Math.Sin(alfa);
                g.DrawLine(pen1, (float)x0 + pictureBox1.Width / 2, (float)y0 + pictureBox1.Height / 2, (float)x + pictureBox1.Width / 2, (float)y + pictureBox1.Height / 2);

                x0 = x;
                y0 = y;

            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            double x = 0;
            double y = 0;
            double r;
            double n;
            double alfa = 0;
            Double.TryParse(textBox1.Text, out n);
            Double.TryParse(textBox2.Text, out r);
            double przyrost_alfa = (2 * Math.PI) / n;

            double x0 = r * Math.Cos(przyrost_alfa);
            double y0 = r * Math.Sin(przyrost_alfa);

            pictureBox1.Refresh();
            for (int i = 0; i <=7* n; i++)
            {

                alfa = alfa + przyrost_alfa;

                x = r * Math.Cos(alfa);
                y = r * Math.Sin(alfa);
                g.DrawLine(pen1, (float)x0 + pictureBox1.Width / 2, (float)y0 + pictureBox1.Height / 2, (float)x + pictureBox1.Width / 2, (float)y + pictureBox1.Height / 2);

                x0 = x;
                y0 = y;
                r = r - 0.5;

            }
        }
    }
}