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;
using System.Threading;

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

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            Thread firNegru = new Thread (() => deseneaza(Color.Black, 200, 100));
            firNegru.Start();
        }

        private void deseneaza(Color culoare, Int16 Rx, Int16 Ry)
        {
            Graphics g = pictureBox1.CreateGraphics();
            Pen creion = new Pen(culoare);
            Pen guma = new Pen(Color.DodgerBlue);
            //int x, y;
            int x1, x2, x3, y1, y2, y3, height = 200;
            double alpha;

            g.DrawEllipse(creion, 130, 230, 400, 200);
            for (alpha = -3.14; alpha <= 3.14; alpha += 0.02)
            {
                x1 = (int)(330 + Rx * Math.Cos(alpha));
                y1 = (int)(330 + Ry * Math.Sin(alpha));
                x2 = (int)(330 + Rx * Math.Cos(alpha + 2));
                y2 = (int)(330 + Ry * Math.Sin(alpha + 2));
                x3 = (int)(330 + Rx * Math.Cos(alpha - 2));
                y3 = (int)(330 + Ry * Math.Sin(alpha - 2));

                g.DrawLine(creion, x1, y1, x2, y2);
                g.DrawLine(creion, x1, y1, x3, y3);
                g.DrawLine(creion, x3, y3, x2, y2);

                g.DrawLine(creion, x1, y1 - height, x2, y2 - height);
                g.DrawLine(creion, x1, y1 - height, x3, y3 - height);
                g.DrawLine(creion, x3, y3 - height, x2, y2 - height);

                g.DrawLine(creion, x1, y1, x1, y1 - height);
                g.DrawLine(creion, x3, y3, x3, y3 - height);
                g.DrawLine(creion, x2, y2 - height, x2, y2);

                Thread.Sleep(10);

                g.DrawLine(guma, x1, y1, x2, y2);
                g.DrawLine(guma, x1, y1, x3, y3);
                g.DrawLine(guma, x3, y3, x2, y2);

                g.DrawLine(guma, x1, y1 - height, x2, y2 - height);
                g.DrawLine(guma, x1, y1 - height, x3, y3 - height);
                g.DrawLine(guma, x3, y3 - height, x2, y2 - height);

                g.DrawLine(guma, x1, y1, x1, y1 - height);
                g.DrawLine(guma, x3, y3, x3, y3 - height);
                g.DrawLine(guma, x2, y2 - height, x2, y2);
            }
        }
    }
}