This article has been excerpted from book "Graphics Programming with GDI+ ".A polygon is a closed shape with three of more straight sides. Examples of polygons include triangles and rectangles.The Graphics class provides a DrawPolygon method to draw polygons. DrawPolygon draws a polygon defined by an array of points. It takes two arguments: a pen and an array of Points or PointF structures.To draw a polygon, an application first creates a pen and an array of points and then calls the DrawPolygon method with these parameters. Listing 3.19 draws a polygon with five points.LISTING 3.19: Drawing a polygonusing 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 WindowsFormsApplication11{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e) { Graphics g = e.Graphics; // Create a pen Pen greenPen = new Pen(Color.Green, 2); Pen redPen = new Pen(Color.Red, 2); // Create points for polygon PointF pt1 = new PointF(40.0F, 50.0F); PointF pt2 = new PointF(60.0F, 70.0F); PointF pt3 = new PointF(80.0F, 34.0F); PointF pt4 = new PointF(120.0F, 180.0F); PointF pt5 = new PointF(200.0F, 150.0F); PointF[] ptsArray = { pt1, pt2, pt3, pt4, pt5 }; // Draw polygon e.Graphics.DrawPolygon(greenPen, ptsArray); // Dispose of object greenPen.Dispose(); redPen.Dispose(); } }}Figure 3.26 shows the output from Listing 3.19FIGURE 3.26: Drawing a polygonConclusionHope the article would have helped you in understanding how to draw a Polygon in GDI+. Read other articles on GDI+ on the website.
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