title: Create Lines around a guiding line using Miterjoin
body: <p>I am drawing graphs into a WinForms Picturebox. Now I am searching for a possibility to 'duplicate' a line (an array of points), so that the two resulting lines are positioned a fixed distance away from the original one. Like in this picture, I have the red line and want to get the black ones: </p>
  
  <p><a href="http://img227.imageshack.us/img227/2341/linesb.png" rel="nofollow noreferrer">Picture of lines http://img227.imageshack.us/img227/2341/linesb.png</a></p>
  
  <p>I thought about just moving the line a few pixels up/right/up-right, but that leads to strange overlapping lines. </p>
  
  <p>Is there any other approach that does what I want? Any ideas would be greatly appreciated. Thanks!</p>