pyJoy

We just watched Control the other night and both my girlfriend and I liked a poster in the movie. Not knowing that this was an album cover, I immediately thought I should make something like that. So I wrote a script in a couple minutes to generate some images. Source code:

import cairo, sys
import math, random

def gen_row(w, smth=10, shft=0.2, wid=0.5):
    mid = w/2
    shft = mid*shft
    wid = mid*wid

    vals = [0]*w
    for x in xrange(0, w):
        sc = (x-random.uniform(mid-wid, mid+wid))/random.uniform(wid*0.9, wid*1.1)
        sc = math.exp(-sc*sc/2)
        ht = random.uniform(0,sc)
        vals[x] = ht

    for i in xrange(0, smth):
        v = [0]*w
        for x in xrange(1, w-1):
            v[x] = (vals[x] + vals[x-1] + vals[x+1])/3
        vals = v

    return vals

w, h = 256, 512
x0, sc = 4, 20
wid = 0.2

if len(sys.argv)>=3:
    w = int(sys.argv[1])
    h = int(sys.argv[2])

if len(sys.argv)>=4:
    wid = float(sys.argv[3])

surf = cairo.SVGSurface('joy.svg', w, h)
ctx  = cairo.Context(surf)

for y in xrange(10, h, 5):

    ctx.move_to(x0, y)
    row = gen_row(w, wid=wid)
    
    for x in xrange(x0, w-x0):
        ctx.line_to(x, y-row[x]*sc)

    ctx.set_source_rgba(0,0,0,1)
    ctx.stroke_preserve()

    ctx.set_source_rgba(1,1,1,1)
    ctx.line_to(w-x0, y+10)
    ctx.line_to(0, y+10)
    ctx.line_to(0, y)    
    ctx.fill()
    
surf.finish()