title: Concept Map using D3.JS : straight lines instead of curves
body: <p><a href="http://bl.ocks.org/virtuald/ea7438cb8c6913196d8e" rel="nofollow noreferrer">http://bl.ocks.org/virtuald/ea7438cb8c6913196d8e</a></p>
  
  <p>The above is a link to a smaple concept map. The idea of highliting the curves upon mouse hovering is great and dynamic. </p>
  
  <p>are there any others samples , where INSTEAD  of such curves, ONLY STRAIGHT LINES (horizontal and vertical) are highlighted upon clicking on the data of interest to show its assoiated attributes?</p>
  
  <p>can this map with the curvy lines be modified so that a striaght lines only appear instead???  ACTUALLY the cuves are not always appropriate espicially if you are going to display  a data extracted from an excel table or sheet with a lot of columns linked to each other.   How can this be implemented please?... Thank you v, much for any information or clue. </p>