Csharp/CSharp Tutorial/2D/Ellipse

Draw an ellipse

<source lang="csharp">using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public class DrawAnEllipse : System.Windows.Forms.Form {

 public DrawAnEllipse()
 {
   this.BackColor = System.Drawing.Color.White;
   this.ClientSize = new System.Drawing.Size(400, 400);
   this.Paint += new System.Windows.Forms.PaintEventHandler(this.DrawAnEllipse_Paint);
 }
 static void Main() 
 {
   Application.Run(new DrawAnEllipse());
 }
 private void DrawAnEllipse_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
 {
   Graphics g = e.Graphics;
   // 
   Pen p2 = new Pen(Color.Gray, 7);
   g.DrawEllipse(p2, 200, 200, 150, 190);
 }

}</source>

DrawEllipse: Traffic Lights

<source lang="csharp">using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; public class Form1 : Form {

   private string strColor;
   public static void Main() {
       Application.Run(new Form1());
   }
   private void Form1_Click(object sender, EventArgs e) {
       switch (strColor) {
           case "red":
               strColor = "yellow";
               break;
           case "yellow":
               strColor = "green";
               break;
           default:
               strColor = "red";
               break;
       }
       this.Invalidate(new Rectangle(10, 10, 50, 150));
   }
   private void Form1_Paint(object sender, PaintEventArgs e) {
       Graphics g = e.Graphics;
       g.FillRectangle(Brushes.White, this.ClientRectangle);
       g.FillRectangle(Brushes.Black, 10, 10, 50, 150);
       g.DrawEllipse(Pens.White, 15, 15, 40, 40);
       g.DrawEllipse(Pens.White, 15, 60, 40, 40);
       g.DrawEllipse(Pens.White, 15, 105, 40, 40);
       switch (strColor) {
           case "red":
               g.FillEllipse(Brushes.Red, 15, 15, 40, 40);
               break;
           case "yellow":
               g.FillEllipse(Brushes.Yellow, 15, 60, 40, 40);
               break;
           case "green":
               g.FillEllipse(Brushes.Green, 15, 105, 40, 40);
               break;
           default:
               g.FillEllipse(Brushes.Red, 15, 15, 40, 40);
               break;
       }
   }

}</source>