title: Draw fitted line (OpenCV)
body: <p>I'm using OpenCV to fit a line from a set of points using <code>cvFitLine()</code></p>
  
  <p><code>cvFitLine()</code> returns a normalized vector that is co-linear to the line and a point on the line. 
  See details <a href="http://opencv.willowgarage.com/documentation/c/structural_analysis_and_shape_descriptors.html?highlight=cvfitline#cvFitLine" rel="noreferrer">here</a></p>
  
  <p>Using this information how can I get the equation of a line so that I can draw the line?</p>