axi/examples/stars.py

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2017-01-14 03:18:02 +00:00
import axi
import math
import random
from axi.spatial import Index
from poisson_disc import poisson_disc
def perturb_points(points, deviation):
result = []
for x, y in points:
a = random.random() * 2 * math.pi
r = random.gauss(0, deviation)
x += math.cos(a) * r
y += math.sin(a) * r
result.append((x, y))
return result
def star(x, y, r):
sides = 5
a = random.random() * 2 * math.pi
angle = 2 * math.pi / sides
angles = [angle * i + a for i in range(sides)]
points = [(x + math.cos(a) * r, y + math.sin(a) * r) for a in angles]
points = perturb_points(points, 0.04)
points.append(points[0])
return points[0::2] + points[1::2]
def main():
points = poisson_disc(0, 0, 11, 8.5, 0.4, 64)
index = Index(points)
paths = []
for x1, y1 in points:
index.remove((x1, y1))
x2, y2 = index.nearest((x1, y1))
index.insert((x1, y1))
d = math.hypot(x2 - x1, y2 - y1)
paths.append(star(x1, y1, d / 2))
drawing = axi.Drawing(paths)
drawing = drawing.remove_paths_outside(11, 8.5)
drawing = drawing.sort_paths()
# im = drawing.render()
# im.write_to_png('out.png')
axi.draw(drawing)
if __name__ == '__main__':
main()