I suppose I should have clarified that, yes, its from the book, section 27.1.4.
--- On Sat, 11/13/10, Noel Welsh <noelwe...@gmail.com> wrote: From: Noel Welsh <noelwe...@gmail.com> Subject: Re: [racket] Svannah fractals. To: "Ken Hegeland" <hege...@yahoo.com> Cc: us...@lists.racket-lang.org Date: Saturday, November 13, 2010, 7:35 AM I this in reference to a HtDP exercise, or a personal project? If the later you might be interested in https://github.com/noelwelsh/splatter/blob/master/demo.ss The function tree defines a context-free grammar for drawing ... well, guess. HTH, N. On Sat, Nov 13, 2010 at 3:00 AM, Ken Hegeland <hege...@yahoo.com> wrote: > > I have a nearly working code, it draws the tree, but it is slightly off. I > realize what is wrong that is causing the problem, for each recursive call I > used a set angle. The tree draws all the left branches at the same angle and > all right branches at the same angle. I end up with a picture of a tree with > the left branch not having any more left branches, only right branches. The > right side of the tree has only left branches, no right branches. > > My first thought for gradually changing the angle is to use something like (- > a 10) for the angle in one recursive call, and (+ a 10) in the next, but > this produces a straight line with other lines way off to the right side. I > am using a helper function which converts an angle from degrees in radians to > help me more easily visualize where the branches should point. Is my thought > process going in the correct direction? If anyone wants to see the code I > have feel free to email me, as always, thanks in advance for any help.
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