SketchUp/sketchup-shapes — pull request #20 by johnwmcc (2014-03-23 16:17:54+00:00)
Title: Added Helix shape

Parametric Helix shape added, based on original DrawHelix13.rb by Peter Brown (2004), and adapted by Jim Foltz (ca 2010) as DrawHelix14.rb. I've made additions to allow left hand and downward going helices, and with an additional parameter for the angle at which to start drawing.