포락선(envelope)과 curve stitching

Curve Stitching or String Art.

 

http://playingwithmathematica.com/2011/04/27/curve-stitching-with-mathematica/

http://britton.disted.camosun.bc.ca/string_art/jbstringart.htm

http://www.wikihow.com/Create-a-Line-Design

 

 

베지에 곡선

http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Quadratic_curves

 

 

예

parabolic line construction

http://demonstrations.wolfram.com/CircleChordEnvelope/

 

 

envelope

http://en.wikipedia.org/wiki/Envelope_(mathematics)

http://jwilson.coe.uga.edu/Texts.Folder/Envel/envelopes.html

 

envelope equation

http://www.sjsu.edu/faculty/watkins/envelopetheo.htm