# Tk_Struct_Mandelbrot.py

# Tk_Struct_Mandelbrot.py

from tkinter import *
from functools import lru_cache
from PIL import Image, ImageTk
import struct

ww = 200
hh = 200

root = Tk()
root.title("Tk_Struct_Mandelbrot")
root.geometry('{}x{}'.format(ww * 2, hh))

canvas_main = Canvas(root, width=ww, height=hh)
canvas_main.pack(side=LEFT, fill="both", expand=True)

canvas_debug = Canvas(root, width=ww, height=hh, bg='white')
canvas_debug.pack(side=LEFT, fill="both", expand=True)

zoom_factor = 1.5

xRange = 1.0
yRange = 1.0
xOffset = 0
yOffset = 0
cx = ww // 2
cy = hh // 2
dx = dy = 0

precision = 400

def cache_mandelbrot(x0, y0):
    struct_key = struct.pack('dd', x0, y0)
    if struct_key in cache_mandelbrot.cache:
        return cache_mandelbrot.cache[struct_key]

    x = 0.0
    y = 0.0
    k = 4000
    for i in range(precision + 1):
        x_new = x * x - y * y + x0
        y = 2 * x * y + y0
        x = x_new
        if x * x + y * y > 10:
            k = 12
            break
    j = (x * x + y * y) ** 0.5
    j = int(i * (i * 10) + j * k) % Lr
    result = rainbow[j]

    cache_mandelbrot.cache[struct_key] = result

    return result

cache_mandelbrot.cache = {}

def rgb2hex(rgb):
    r, g, b = rgb
    return "#{:02x}{:02x}{:02x}".format(r, g, b)

rainbow = []
def z(r, g, b):
    rainbow.append((r, g, b))

r, g, b = 255, 0, 0
for g in range(256):
    z(r, g, b)
for r in range(254, -1, -1):
    z(r, g, b)
for b in range(256):
    z(r, g, b)
for g in range(254, -1, -1):
    z(r, g, b)
for r in range(256):
    z(r, g, b)
for b in range(254, -1, -1):
    z(r, g, b)
Lr = len(rainbow) - 1

img = Image.new('RGB', (ww, hh))
pixels = img.load()

def calculate_mandelbrot(xRange, yRange):
    canvas_debug.create_text(10, 20, anchor=NW, text="Processing, Please Wait...")
    canvas_debug.update()
    canvas_main.delete("all")
    for row in range(hh):
        for col in range(ww):
            x0 = ((row - 50 - cx + dx + xOffset * xRange) * 3 / ww) / xRange
            y0 = ((col - cy + dy + yOffset * yRange) * 2.5 / hh) / yRange
            pixels[col, row] = cache_mandelbrot(x0, y0)
    canvas_main.image = ImageTk.PhotoImage(img)
    canvas_main.create_image(0, 0, anchor=NW, image=canvas_main.image)
    update_debug_canvas()

def update_debug_canvas():
    canvas_debug.delete("all")
    canvas_debug.create_text(10, 50, anchor=NW, text=f"x offset: {xOffset*-1}")
    canvas_debug.create_text(10, 70, anchor=NW, text=f"y offset: {yOffset*-1}")
    canvas_debug.create_text(10, 90, anchor=NW, text=f"zoom_factor: {xRange}")

def on_mouse_down(event):
    global drag_data
    drag_data = {'x': event.x, 'y': event.y}
def on_mouse_move(event):
    global dx, dy
    dx = (event.x - drag_data['x'])
    dy = (event.y - drag_data['y'])
    canvas_main.coords("all", dx, dy)
    update_debug_canvas()
def on_mouse_up(event):
    global xOffset, yOffset, dx, dy
    dx /= yRange
    dy /= xRange
    xOffset -= dy
    yOffset -= dx
    dx = dy = 0
    calculate_mandelbrot(xRange, yRange)

def on_key_up(event):
    global xRange, yRange
    xRange, yRange = (xRange * zoom_factor, yRange * zoom_factor)
    calculate_mandelbrot(xRange, yRange)
def on_key_down(event):
    global xRange, yRange
    xRange, yRange = (xRange / zoom_factor, yRange / zoom_factor)
    calculate_mandelbrot(xRange, yRange)

canvas_main.bind('<Button-1>', on_mouse_down)
canvas_main.bind('<B1-Motion>', on_mouse_move)
canvas_main.bind('<ButtonRelease-1>', on_mouse_up)
root.bind('<Down>', on_key_down)
root.bind('<Up>', on_key_up)

calculate_mandelbrot(xRange, yRange)

root.mainloop()