Draw a Series of Straight Upward Lines on a Circle that Is Shifted Horizontally in the Middle

20200531.py

#!/usr/bin/env python3

from math import pi, sin, cos, radians;

# Method: Draw a circle of points, shift all points to the left when drawing the upper half, shift all points to the right
#         when drawing the lower half. At the end draw a straigh line going upwards on each point (or downwards… not sure
#         which direction SVG is doing stuff. ;) )
#
# Note:   Bunch of double calculations there, so this is not very optimized… :D

width   = 1024
height  = width
spacing = 264
radius  = 200

print('<svg width="100%" height="100%" viewBox="0 0 {} {}" xmlns="http://www.w3.org/2000/svg">'.format(width, height),
	'<g fill="black">',
	''.join('<line x1="{x1}" y1="{y1}" x2="{x1}" y2="{y2}" stroke="rgba(240, 176, 0, 0.4)" stroke-linecap="round" stroke-width="5" />'.format(
		x1=(sin(radians(a))*radius+(width/2))+(radius if (radians(a) < (pi/2)) else -radius),
		y1=(cos(radians(a))*radius+spacing),
		y2=(cos(radians(a))*radius+spacing)+(height-(2*spacing))
	) for a in range(-90, 360-90, 2)),
	'</g></svg>', sep='', end='')
	
	
# Ideas/ References:
#   https://www.instagram.com/p/B6GcVQKoZ1u/
#   https://old.reddit.com/r/generative/comments/gu540c/recreation_of_an_axidraw_sketch_i_found/
#
# Result:
#   https://external.binaryriot.org/site-reddit-com/2020.05/31_axidraw_recreation.svg
#