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Re: modify coord-rotate to get exact values for (sin PI) etc (issue 2695

From: thomasmorley65
Subject: Re: modify coord-rotate to get exact values for (sin PI) etc (issue 269530043 by address@hidden)
Date: Tue, 20 Oct 2015 21:55:00 +0000

Let me split my reply into two.

This one about the current patch and how to proceed.

On 2015/10/20 14:25:21, dak wrote:
I'm not really enthused about this approach even though it originates
from a
proposal of mine.  It works basically by moving around problematic


leading to discontinuities at multiples of PI/4 rather than just PI

PI/2 is problematic as well (from scheme-sandbox):
guile> (cos (/ PI 2))

I locally have a bunch of code, which I plan to turn into patches,
committing them in small pieces to ease review.

- simplified make-bezier-sandwich-stencil (already pushed)
- exact coord-rotate
- a generic make-bow-stencil, which _needs_ _exact_ coord-rotate
- the undertie-markup-command
- redefined make-parentheses-stencil
- a markup-command for drawing squiggle lines (under construction)
- a stencil-command to draw more fancy squiggle lines (under

All rely on make-bow-stencil.

I could
upload them, one after another, postponing a better coord-rotate (but
again, an exact coord-rotate for multiples of PI/2 is needed)
doing a better coord-rotate first (see next post)

What do you think?

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