Drawing circles with System.Drawing

Question

I have this code that draws a Rectangle ( Im trying to remake the MS Paint )

 case "Rectangle":                if (tempDraw != null)                 {                     tempDraw = (Bitmap)snapshot.Clone();                     Graphics g = Graphics.FromImage(tempDraw);                     Pen myPen = new Pen(foreColor, lineWidth);                     g.DrawRectangle(myPen, x1, y1, x2-x1, y2-y1);                     myPen.Dispose();                     e.Graphics.DrawImageUnscaled(tempDraw, 0, 0);                     g.Dispose();                 } 

But what if I want to draw a circle, what will change?

g.DrawRectangle(myPen, x1, y1, x2-x1, y2-y1); 

Answer 1

There is no DrawCircle method; use DrawEllipse instead. I have a static class with handy graphics extension methods. The following ones draw and fill circles. They are wrappers around DrawEllipse and FillEllipse:

public static class GraphicsExtensions {     public static void DrawCircle(this Graphics g, Pen pen,                                   float centerX, float centerY, float radius)     {         g.DrawEllipse(pen, centerX - radius, centerY - radius,                       radius + radius, radius + radius);     }      public static void FillCircle(this Graphics g, Brush brush,                                   float centerX, float centerY, float radius)     {         g.FillEllipse(brush, centerX - radius, centerY - radius,                       radius + radius, radius + radius);     } } 

You can call them like this:

g.FillCircle(myBrush, centerX, centerY, radius); g.DrawCircle(myPen, centerX, centerY, radius); 

Answer 2

Try the DrawEllipse method instead.