[Notes: This tutorial is an excerpt (Section 17.9) of Chapter 17, Graphics and Multimedia, from our textbook Visual C# 2005 How to Program, 2/e. This tutorial may refer to other chapters or sections of the book that are not included here. Permission Information: Deitel, Harvey M. and Paul J., Visual C# How to Program, 2/E ©2006. Electronically reproduced by permission of Pearson Education, Inc., Upper Saddle River, New Jersey.]

Fig. 17.22 Paths used to draw stars on a form.

1    // Fig. 17.22: DrawStarsForm.cs

2    // Using paths to draw stars on the form.

3    using System;

4    using System.Drawing;

5    using System.Drawing.Drawing2D;

6    using System.Windows.Forms;

7

8    // draws randomly colored stars

9    public partial class DrawStarsForm : Form

10   {

11       // default constructor

12       public DrawStarsForm()

13       {

14          InitializeComponent();

15       } // end constructor

16

17       // create path and draw stars along it

18       private void DrawStarsForm_Paint(object sender, PaintEventArgs e)

19       {

20          Graphics graphicsObject = e.Graphics;

21          Random random = new Random();

22          SolidBrush brush =

23             new SolidBrush( Color.DarkMagenta );

24

25          // x and y points of the path

26          int[] xPoints =

27             { 55, 67, 109, 73, 83, 55, 27, 37, 1, 43 };

28          int[] yPoints =

29             { 0, 36, 36, 54, 96, 72, 96, 54, 36, 36 };

30

31          // create graphics path for star;

32          GraphicsPath star = new GraphicsPath();

33

34          // create star from series of points

35          for ( int i = 0; i <= 8; i += 2 )

36             star.AddLine( xPoints[ i ], yPoints[ i ],

37                xPoints[ i + 1 ], yPoints[ i + 1 ] );

38

39          // close the shape

40          star.CloseFigure();

41

42          // translate the origin to (150, 150)

43          graphicsObject.TranslateTransform( 150, 150 );

44

45          // rotate the origin and draw stars in random colors

46          for ( int i = 1; i <= 18; i++ )

47          {

48             graphicsObject.RotateTransform( 20 );

49

50             brush.Color = Color.FromArgb(

51                random.Next( 200, 255 ), random.Next( 255 ),

52                random.Next( 255 ), random.Next( 255 ) );

53

54             graphicsObject.FillPath( brush, star );

55          } // end for

56       } // end method DrawStarsForm_Paint

57    } // end class DrawStarsForm