5. Изчертаване на триъгълник чрез линии

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Drawing;

 

namespace r

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent(); Draw();

        }

 

 

        public void Draw()

        {

1 задача: Изчертаване на триъгълник с координати на долния ляв ъгъл  x1 = 200, y1 =300 и страна a = 200.

     int a = 200, x1 = 200, y1 =300 , x2, y2, x3, y3; 
          x2 = x1 + a; 
            y2 = y1; 
            x3 = (x1 + x2) / 2; 
            int h = (int)(a * Math.Sqrt(3) / 2); 
            y3 = y1 - h; 
            Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height); 

            Graphics graph = Graphics.FromImage(bmp); 
            Pen pen = new Pen(Color.Red,2); 
             
            graph.DrawLine(pen, x1, y1, x2, y2); 
            graph.DrawLine(pen, x2, y2, x3, y3); 
            graph.DrawLine(pen, x3, y3, x1, y1); 
            pictureBox1.Image = bmp;