Draw Pie for Scroll Bar

Start a new project. Add a scroll bar hsbDegrees.
Set the properties so that you can select any integer value from 0 to 360.
Add labels lblInfo and lblDegrees as shown.

Add this code to the Scroll event for hsbAngle:

private void hsbAngle_Scroll(object sender, ScrollEventArgs e)
{
   // Get the graphics of the form.
   Graphics g = this.CreateGraphics();
   // Create a Black Brush for background.
   SolidBrush myBrushBackground = new SolidBrush(Color.Black);
   // Create a Red Brush for foreground.
   SolidBrush myBrushForeground = new SolidBrush(Color.Red);
   // We want to draw the pie under the scroll bar.
   int top = hsbAngle.Location.Y + hsbAngle.Height+10;
   // Create a rectangle 200x200 (square) for the circle.
   Rectangle myRect = new Rectangle(10, top, 200, 200);
   g.FillPie(myBrushBackground, myRect, 0, 360);
   g.FillPie(myBrushForeground, myRect, 0, hsbAngle.Value);
   lblDegrees.Text = hsbAngle.Value.ToString();
}

To Do: Experiment! Try using 2 scroll bars to select the start and end angle.

End of lesson, Next lesson: ListBox Manager in C#