title: Parallel line using Clipper library
body: <p>I'm using <a href="http://www.angusj.com/delphi/clipper.php" rel="noreferrer">CLIPPER</a> library to offset line and trying to make parallel line.</p>
  
  <pre><code>ClipperOffset co = new ClipperOffset();
  
  co.AddPath (s, JoinType.jtRound, EndType.etOpenRound);
  
  co.Execute (ref solution, 15);
  </code></pre>
  
  <p>Result is right image in attachment. I need parallel lines instead of offset line "around" main line.</p>
  
  <p>Does anyone know is it possible in Clipper or maybe anyone have any idea how to filter result points to remove unnecessary?</p>
  
  <p><a href="https://i.stack.imgur.com/zsKNc.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zsKNc.png" alt="enter image description here"></a> </p>