test

piratemap.py

import math
import colorsys
from itertools import product

from noise import snoise2
from PIL import Image
import numpy as np


size = (500, 500)

im = Image.new('RGB', size)
data = np.zeros((size[1], size[0], 3), dtype='uint8')


hi = np.array(colorsys.rgb_to_hsv(0, 255, 0))
lo = np.array(colorsys.rgb_to_hsv(0, 0, 128))
delta = hi - lo

stretch_factor = 20
zoom = 16.0 * 32
for y, x in product(*(range(n) for n in size)):
    z = snoise2(
        x/zoom, y/zoom,
        octaves=10,
        persistence=0.6,
        # lacunarity=2.0,
        repeatx=1000,
        repeaty=1001,
        base=0.0)
    # z = (-math.sqrt(abs(z)) + 1) / 2
    z = (z + 1) / 2
    z = max(0.0, min(1.0, 0.5 + (z - 0.5) * stretch_factor))
    data[x,y] = colorsys.hsv_to_rgb(*(lo + (delta * z)))


hi = np.array([0, 255, 0], dtype='uint8')
lo = np.array([0, 0, 128], dtype='uint8')


im.frombytes(data)

im.save('test.png')
im.show()