title: Metric to compare how similar two 2D linear lines are
body: <p>Is there an algorithm ( preferably in C# implementation) that allows me to compare how similar two lines are? In my case I have one reference line, and I have a lot of secondary lines, I need to choose, out of so many secondary lines, which is the closest to the reference line. </p>
  
  <p><strong>Edit: It is a 2D line, with start and stop points. When you compare the similarities, you to take into account of the full blown line. The direction of the line ( i.e., whether it's from left to right or vice versa) is not important. And yes, it has to do with how close it is from one another</strong></p>
  
  <p>I know this is kind of subjective ( the similarity, not the question), but still, I am sure there are people who have done work on this. </p>