class FractalCanvas(object):
def __init__(self, parent, levels):
self.levels = levels
# Toggles screen update rate
self.slow_drawing = False
# Draw button
button = Button(parent, text='Draw Fractal', command=self._draw_click)
button.pack()
width, height = (600, 600)
self.canvas = Canvas(parent, width=600, height=600)
# Constrain resizing to a 1:1 aspect ratio
self.canvas.winfo_toplevel().aspect(1, 1, 1, 1)
self.canvas.pack(fill=BOTH, expand=YES)
# Setup a turtle
self.turtleScreen = TurtleScreen(self.canvas)
# 5px of padding
self.turtleScreen.setworldcoordinates(-5, -height - 5, width + 5, 5)
self.turtle = RawTurtle(self.turtleScreen)
self.turtleScreen.colormode(255)
# Listen to resize events
self.canvas.bind('<Configure>', self._resize_and_draw)
# Do an initial draw
self.slow_drawing = True
self._resize_and_draw()
self.slow_drawing = False
def _draw_click(self):
"""Handler for button click."""
# Draw the fractal slowly when we press the button, but quickly
# if we're drawing for a resize
self.slow_drawing = True
self._resize_and_draw()
self.slow_drawing = False
def _resize_and_draw(self, event=None):
"""Handler for when the canvas resizes (due to a window resize)."""
self.draw(self.canvas.winfo_width(), self.canvas.winfo_height())
def draw(self, width, height):
"""Draws the fractal."""
pass
def update_screen(self):
"""
Conditionally updates the screen.
If self.slow_drawing is set, then this method forces image data to be
pushed to the screen, otherwise it does nothing.
"""
if self.slow_drawing:
self.turtleScreen.update()
def main(pattern: str) -> None:
master = Tk()
canvas = ScrolledCanvas(master)
canvas.pack()
screen = TurtleScreen(canvas)
screen.colormode(255)
turt = RawTurtle(screen)
draw_dots(turt)
turt.pencolor((178, 34, 34))
draw_pattern(turt, pattern)
screen.mainloop()
