axi/examples/tree_rings.py

46 lines
1.3 KiB
Python
Raw Normal View History

2017-01-08 23:49:00 +00:00
import axi
import math
import sys
from PIL import Image
def create_paths(im):
f = (255 * 255 * 3) ** 0.5
paths = []
w, h = im.size
for m in [-2, -1, 0, 1, 2]:
for radius in range(0, w, 8):
path = []
for a in range(1800):
a = math.radians(a / 10.0)
x = w / 2 + int(math.cos(a) * radius)
y = h - int(math.sin(a) * radius)
if x < 0 or x >= w:
continue
if y < 0 or y >= h:
continue
r, g, b = im.getpixel((x, y))
p = (r * r + g * g + b * b) ** 0.5
p = 1 - (p / f)
p = p ** 2
if p < 0.05:
if len(path) > 1:
paths.append(path)
path = []
else:
x = w / 2 + math.cos(a) * (radius + m * p * 1.5)
y = h - math.sin(a) * (radius + m * p * 1.5)
path.append((x, y))
if len(path) > 1:
paths.append(path)
return paths
def main():
paths = create_paths(Image.open(sys.argv[1]))
drawing = axi.Drawing(paths).rotate_and_scale_to_fit(11, 8.5, step=90)
drawing = drawing.sort_paths().join_paths(0.02)
axi.draw(drawing)
if __name__ == '__main__':
main()