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: penrose.py

#! /usr/bin/python3.12
"""       xturtle-example-suite:

xtx_kites_and_darts.py

Constructs two aperiodic penrose-tilings,
consisting of kites and darts, by the method
of inflation in six steps.

Starting points are the patterns "sun"
consisting of five kites and "star"
consisting of five darts.

For more information see:
 http://en.wikipedia.org/wiki/Penrose_tiling
 -------------------------------------------
"""
from turtle import *
from math import cos, pi
from time import perf_counter as clock, sleep

f = (5**0.5-1)/2.0   # (sqrt(5)-1)/2 -- golden ratio
d = 2 * cos(3*pi/10)

def kite(l):
    fl = f * l
    lt(36)
    fd(l)
    rt(108)
    fd(fl)
    rt(36)
    fd(fl)
    rt(108)
    fd(l)
    rt(144)

def dart(l):
    fl = f * l
    lt(36)
    fd(l)
    rt(144)
    fd(fl)
    lt(36)
    fd(fl)
    rt(144)
    fd(l)
    rt(144)

def inflatekite(l, n):
    if n == 0:
        px, py = pos()
        h, x, y = int(heading()), round(px,3), round(py,3)
        tiledict[(h,x,y)] = True
        return
    fl = f * l
    lt(36)
    inflatedart(fl, n-1)
    fd(l)
    rt(144)
    inflatekite(fl, n-1)
    lt(18)
    fd(l*d)
    rt(162)
    inflatekite(fl, n-1)
    lt(36)
    fd(l)
    rt(180)
    inflatedart(fl, n-1)
    lt(36)

def inflatedart(l, n):
    if n == 0:
        px, py = pos()
        h, x, y = int(heading()), round(px,3), round(py,3)
        tiledict[(h,x,y)] = False
        return
    fl = f * l
    inflatekite(fl, n-1)
    lt(36)
    fd(l)
    rt(180)
    inflatedart(fl, n-1)
    lt(54)
    fd(l*d)
    rt(126)
    inflatedart(fl, n-1)
    fd(l)
    rt(144)

def draw(l, n, th=2):
    clear()
    l = l * f**n
    shapesize(l/100.0, l/100.0, th)
    for k in tiledict:
        h, x, y = k
        setpos(x, y)
        setheading(h)
        if tiledict[k]:
            shape("kite")
            color("black", (0, 0.75, 0))
        else:
            shape("dart")
            color("black", (0.75, 0, 0))
        stamp()

def sun(l, n):
    for i in range(5):
        inflatekite(l, n)
        lt(72)

def star(l,n):
    for i in range(5):
        inflatedart(l, n)
        lt(72)

def makeshapes():
    tracer(0)
    begin_poly()
    kite(100)
    end_poly()
    register_shape("kite", get_poly())
    begin_poly()
    dart(100)
    end_poly()
    register_shape("dart", get_poly())
    tracer(1)

def start():
    reset()
    ht()
    pu()
    makeshapes()
    resizemode("user")

def test(l=200, n=4, fun=sun, startpos=(0,0), th=2):
    global tiledict
    goto(startpos)
    setheading(0)
    tiledict = {}
    tracer(0)
    fun(l, n)
    draw(l, n, th)
    tracer(1)
    nk = len([x for x in tiledict if tiledict[x]])
    nd = len([x for x in tiledict if not tiledict[x]])
    print("%d kites and %d darts = %d pieces." % (nk, nd, nk+nd))

def demo(fun=sun):
    start()
    for i in range(8):
        a = clock()
        test(300, i, fun)
        b = clock()
        t = b - a
        if t < 2:
            sleep(2 - t)

def main():
    #title("Penrose-tiling with kites and darts.")
    mode("logo")
    bgcolor(0.3, 0.3, 0)
    demo(sun)
    sleep(2)
    demo(star)
    pencolor("black")
    goto(0,-200)
    pencolor(0.7,0.7,1)
    write("Please wait...",
          align="center", font=('Arial Black', 36, 'bold'))
    test(600, 8, startpos=(70, 117))
    return "Done"

if __name__ == "__main__":
    msg = main()
    mainloop()

Name	Type	Last Edit	Size	Owner/Group	Permission	Action
..
__init__.py	file	2025-10-09 11:07	314 B	root/root	s---------
__main__.py	file	2025-10-09 11:07	15.01 KB	root/root	s---------
bytedesign.py	file	2025-10-09 11:07	4.15 KB	root/root	s---------
chaos.py	file	2025-10-09 11:07	951 B	root/root	s---------
clock.py	file	2025-10-09 11:07	3.23 KB	root/root	s---------
colormixer.py	file	2025-10-09 11:07	1.31 KB	root/root	s---------
forest.py	file	2025-10-09 11:07	2.9 KB	root/root	s---------
fractalcurves.py	file	2025-10-09 11:07	3.39 KB	root/root	s---------
lindenmayer.py	file	2025-10-09 11:07	2.38 KB	root/root	s---------
minimal_hanoi.py	file	2025-10-09 11:07	2 KB	root/root	s---------
nim.py	file	2025-10-09 11:07	6.36 KB	root/root	s---------
paint.py	file	2025-10-09 11:07	1.26 KB	root/root	s---------
peace.py	file	2025-10-09 11:07	1.04 KB	root/root	s---------
penrose.py	file	2025-10-09 11:07	3.3 KB	root/root	s---------
planet_and_moon.py	file	2025-10-09 11:07	2.76 KB	root/root	s---------
rosette.py	file	2025-10-09 11:07	1.33 KB	root/root	s---------
round_dance.py	file	2025-10-09 11:07	1.76 KB	root/root	s---------
sorting_animate.py	file	2025-10-09 11:07	4.93 KB	root/root	s---------
tree.py	file	2025-10-09 11:07	1.37 KB	root/root	s---------
turtle.cfg	file	2025-10-09 11:07	160 B	root/root	s---------
two_canvases.py	file	2025-10-09 11:07	1.09 KB	root/root	s---------
yinyang.py	file	2025-10-09 11:07	821 B	root/root	s---------