placevalue_inf.py

''' print out binary place value patterns '''
''' glitchy infinite scroll version '''
''' hit any key to exit ''' 
''' see https://github.com/mouse-reeve/placevalue_ascii '''

import math
import argparse
import time
import sys
import os
import select

def placevalue_patterner(function, height, width, placevalue, offset_y=0,):
    ''' create a visualization of a place value pattern '''
    visual = []
    for i in range(offset_y, offset_y + height):
        row = ''
        for j in range(width):
            value = function(i, j)
            binary = '{0:b}'.format(int(value))
            if len(binary) > placevalue and binary[-1 * placevalue] == '1':
                row += '*'
            else:
                row += ' '
        visual.append(row)
    return '\n'.join(visual)


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('function',
                        help='The function to plot, e.g. "x ** 2 * y ** 2"',
                        type=lambda s: eval('lambda x, y: {}'.format(s)))
    parser.add_argument('placevalue', type=int)
    parser.add_argument('width', type=int)
    parser.add_argument('delay', type=float)
    args = parser.parse_args()

    i = 0
    while True:
        os.system('cls' if os.name == 'nt' else 'clear')
        if sys.stdin in select.select([sys.stdin], [], [], 0)[0]:
            line = input()
            break
        print(placevalue_patterner(args.function, i, args.width,
              args.placevalue))
        time.sleep(args.delay)
        i += 1

python placevalue_inf.py "x2 - y2" 6 100 0.25