01-cantor.py

# Cantor set done with nodebox-opengl.
# https://github.com/nodebox/nodebox-opengl/tree/master/nodebox/graphics
import random

import nodebox.graphics as nbg


STEP_HEIGHT = 20
BUF_HEIGHT = 5
MAX_DEPTH = 8


def cantor( x, y, d, canvas ):
    rx = x * canvas.width
    ry = y * (STEP_HEIGHT + BUF_HEIGHT)
    rd = d * canvas.width
    nbg.rect( x=rx, y=ry, width=rd, height=STEP_HEIGHT )

    if y >= MAX_DEPTH:
        return
    y += 1

    newD = (d / 3.0)
    cantor( x, y, newD, canvas )
    cantor( x + d * 2.0 / 3.0, y, newD, canvas )


def draw( canvas ):
    canvas.clear()
    cantor( 0, 0, 1.0, canvas )
    

nbg.canvas.size = 500, 500
nbg.canvas.run( draw )

First attempt at doing some work with fractals. The cantor set seemed like an obvious choice and the nodebox-opengl lib makes drawing stuff nice and easy.