3. Изчертаване на линии

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 

namespace WindowsFormsApplication19 
{ 
    public partial class Form1 : Form 
    { 
        public Form1() 
        { 
            InitializeComponent(); 
        } 

        protected override void  OnPaint(PaintEventArgs e) 
{ 
     
     
            Graphics g = e.Graphics; 
            Pen p = new Pen(Color. Blue, 2); 
            int n = 1, m = 30; 
            int x1 = 100; 
            int y1 = 500; 
            int a = 500; 
            int x2 = x1 + a; 
            int y2 = y1; 
            int h = (int)(a * Math.Sqrt(3) / 2); 
            int x3 = (x1 + x2) / 2, y3 = y1 - h; 
            g.DrawLine(p, x1,y1,x2,y2); 
            g.DrawLine(p, x2, y2, x3, y3); 
            g.DrawLine(p, x3, y3, x1, y1); 
            for (int i = 1; i <= 80; i++) 
            { 
                int x = x1; 
                int y = y1; 
                x1 = (n * x1 + m * x2) / (m + n); 
                y1 = (n * y1 + m * y2) / (n + m); 
                x2 = (n * x2 + m * x3) / (m + n); 
                y2 = (n * y2 + m * y3) / (m + n); 
                x3 = (n * x3 + m * x) / (m + n); 
                y3 = (n * y1 + m * y) / (m + n); 
                g.DrawLine(p, x1, y1, x2, y2); 
                g.DrawLine(p, x2, y2, x3, y3); 
                g.DrawLine(p, x3, y3, x1, y1); 
            } 
        } 
    } 
}