

Line 3: 
Line 3: 
 Image=DragonCurve.jpg   Image=DragonCurve.jpg 
 ImageIntro=The image above is an example of a HarterHeighway Curve (also called Dragon Curve). This fractal was first described in 1967 by American Martin Gardner and is often referred to as the Jurassic Park Curve, because it garnered popularity after being drawn and alluded to in the novel Jurassic Park by Michael Crichton (1990).   ImageIntro=The image above is an example of a HarterHeighway Curve (also called Dragon Curve). This fractal was first described in 1967 by American Martin Gardner and is often referred to as the Jurassic Park Curve, because it garnered popularity after being drawn and alluded to in the novel Jurassic Park by Michael Crichton (1990). 
  ImageDescElem=
 
  [[Image:DragonCurve_Construction.jpg600pxthumbFirst 5 iterations of the HarterHeighway Curveleft]]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  The curve itself is fairly simple, with a line as the base segment. Each iteration replaces each line with two line segments at an angle of 90 degrees (other angles can be used to make various looking fractals), with each line being rotated alternatively to the left or to the right of the line it is replacing.
 
  [[Image:DragonCurve_int15.gifthumb200pxright15th iteration]]
 
 
 
 
 
  The HarterHeighway Dragon is created by iteration of the curve described above. The curve can be repeated infinitely, so that the perimeter of the dragon is in fact infinite. However, if you look to the image at the right, a 15th iteration of the HarterHeighway Dragon is already enough to create an impressive fractal.
 
 
 
  The perimeter of the HarterHeighway curve increases by<math>\sqrt{2}</math> with each repetition of the curve.
 
 
 
  An interesting property of this curve is that the curve never crosses itself. Also, the curve exhibits ''selfsimilarity'' because as you look closer and closer at the curve, the curve continues to look like the larger curve.
 
  PreK=No
 
  Elementary=No
 
  MiddleSchool=Yes
 
  HighSchool=Yes
 
  ImageDesc====Perimeter===
 
  [[Image:DragonCurve_basic.jpgthumbleft250pxFirst iteration in detail]]
 
 
 
 
 
 
 
  The perimeter of the HarterHeighway curve increases by a factor of <math>\sqrt{2}</math> for each iteration.
 
 
 
  For example, if the first iteration is split up into two isosceles triangles, the ratio between the base segment and first iteration is: <math>\frac{2\sqrt{2}}{2s} = \sqrt{2}</math>
 
 
 
 
 
 
 
 
 
 
 
 
 
  ===Number of Sides===
 
  The number of sides of the HarterHeighway curve for any degree of iteration (''k'') is given by <math>N_k = 2^k\,</math>.
 
 
 
 
 
  ===Fractal Dimension===
 
  The [[Fractal Dimension]] of the HarterHeighway Curve can be calculated to be: <math>\frac{logN}{loge} = \frac{log2}{log\sqrt{2}} = 2 </math>, so it is a spacefilling curve.
 
 
 
  ===Angle===
 
  The HarterHeighway curve iterates with a 90 degree angle. However, if the angle is changed, new curves can be created:
 
 
 
  <gallery caption="" widths="300px" heights="200px" perrow="3">
 
  Image:CurveAngle85.jpg'''Curve with angle 85'''
 
  Image:CurveAngle100.jpg'''Curve with angle 100'''
 
  Image:CurveAngle110.jpg'''Curve with angle 110'''
 
  </gallery>
 
 
 
 
 
  other=Geometry
 
  AuthorName=SolKoll
 
  AuthorDesc=SolKoll is interested in fractals, and created this image using an iterated function system (IFS).
 
  SiteName=Wikimedia Commons
 
  SiteURL=http://commons.wikimedia.org/wiki/File:HarterHeighways_dragon_curve_(3D_twist).jpg
 
  Field=Dynamic Systems
 
  Field2=Fractals
 
 }}   }} 