generativeart/moon.py

#!/usr/bin/env python3

import cairo
import math
import random
from utils import circle_fill
from utils import draw_crater
from utils import random_color
from utils import moon_shade

WIDTH, HEIGHT = 100, 100

def main():

    import sys
    seed = sys.argv[1]
    random.seed(seed)
    
    surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, WIDTH, HEIGHT)
    ctx = cairo.Context(surface)

    ctx.scale(WIDTH, HEIGHT)  # Normalizing the canvas
    ctx.set_source_rgb(0.9, 0.9, 0.9)
    # draw "full" moon
    circle_fill(ctx, 0.5, 0.5, 0.5)
    
    # make sure we only draw "inside" 
    ctx.set_operator(cairo.Operator.ATOP)
    


    # draw craters
    ctx.set_source_rgb(0.5, 0.5, 0.5)
    for c in range(30):
        #c_col = random.uniform(0.4, 0.6)
        #ctx.set_source_rgb(c_col, c_col, c_col)
        c_x = random.uniform(0.0, 1.0)
        c_y = random.uniform(0.0, 1.0)
        c_r = random.uniform(0.01, 0.1)
        draw_crater(ctx, c_x, c_y, c_r)

    # draw "aura"
    a_r, a_g, a_b = random_color()
    p = cairo.RadialGradient(0.5, 0.5, 0.25, 0.5, 0.5, 0.5)
    #p.add_color_stop_rgba(0.0, 0.9, 0.9, 0.9, 0.0)
    p.add_color_stop_rgba(0.0, a_r, a_g, a_b, 0.0)
    p.add_color_stop_rgba(0.3, a_r, a_g, a_b, 0.0)
    p.add_color_stop_rgba(1.0, a_r, a_g, a_b, 0.8)
    ctx.set_source(p)
    ctx.arc(0.5, 0.5, 0.5, 0, math.pi*2)
    #ctx.arc(0.5, 0.5, 0.3, 0, math.pi*2)
    ctx.fill()

    # draw "shade" of the phase
    ctx.set_source_rgba(0.1, 0.1, 0.1, 0.95)
    phase_pos = random.uniform(-1.2, 1.2)
    #circle_fill(ctx, phase_pos, 0.5, 0.5)
    moon_shade(ctx, phase_pos)
    surface.write_to_png(f"nft/{seed}_moon.png")  # Output to PNG

if __name__ == '__main__':
    main()