956 lines
26 KiB
Python
956 lines
26 KiB
Python
# LogoMation-like turtle graphics
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"""
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Turtle graphics is a popular way for introducing programming to
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kids. It was part of the original Logo programming language developed
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by Wally Feurzeig and Seymour Papert in 1966.
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Imagine a robotic turtle starting at (0, 0) in the x-y plane. Give it
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the command turtle.forward(15), and it moves (on-screen!) 15 pixels in
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the direction it is facing, drawing a line as it moves. Give it the
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command turtle.left(25), and it rotates in-place 25 degrees clockwise.
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By combining together these and similar commands, intricate shapes and
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pictures can easily be drawn.
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"""
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from math import * # Also for export
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import Tkinter
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speeds = ['fastest', 'fast', 'normal', 'slow', 'slowest']
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class Error(Exception):
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pass
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class RawPen:
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def __init__(self, canvas):
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self._canvas = canvas
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self._items = []
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self._tracing = 1
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self._arrow = 0
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self._delay = 10 # default delay for drawing
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self._angle = 0.0
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self.degrees()
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self.reset()
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def degrees(self, fullcircle=360.0):
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""" Set angle measurement units to degrees.
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Example:
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>>> turtle.degrees()
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"""
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# Don't try to change _angle if it is 0, because
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# _fullcircle might not be set, yet
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if self._angle:
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self._angle = (self._angle / self._fullcircle) * fullcircle
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self._fullcircle = fullcircle
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self._invradian = pi / (fullcircle * 0.5)
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def radians(self):
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""" Set the angle measurement units to radians.
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Example:
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>>> turtle.radians()
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"""
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self.degrees(2.0*pi)
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def reset(self):
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""" Clear the screen, re-center the pen, and set variables to
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the default values.
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Example:
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>>> turtle.position()
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[0.0, -22.0]
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>>> turtle.heading()
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100.0
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>>> turtle.reset()
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>>> turtle.position()
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[0.0, 0.0]
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>>> turtle.heading()
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0.0
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"""
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canvas = self._canvas
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self._canvas.update()
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width = canvas.winfo_width()
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height = canvas.winfo_height()
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if width <= 1:
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width = canvas['width']
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if height <= 1:
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height = canvas['height']
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self._origin = float(width)/2.0, float(height)/2.0
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self._position = self._origin
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self._angle = 0.0
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self._drawing = 1
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self._width = 1
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self._color = "black"
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self._filling = 0
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self._path = []
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self.clear()
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canvas._root().tkraise()
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def clear(self):
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""" Clear the screen. The turtle does not move.
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Example:
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>>> turtle.clear()
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"""
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self.fill(0)
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canvas = self._canvas
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items = self._items
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self._items = []
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for item in items:
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canvas.delete(item)
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self._delete_turtle()
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self._draw_turtle()
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def tracer(self, flag):
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""" Set tracing on if flag is True, and off if it is False.
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Tracing means line are drawn more slowly, with an
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animation of an arrow along the line.
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Example:
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>>> turtle.tracer(False) # turns off Tracer
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"""
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self._tracing = flag
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if not self._tracing:
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self._delete_turtle()
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self._draw_turtle()
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def forward(self, distance):
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""" Go forward distance steps.
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Example:
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>>> turtle.position()
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[0.0, 0.0]
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>>> turtle.forward(25)
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>>> turtle.position()
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[25.0, 0.0]
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>>> turtle.forward(-75)
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>>> turtle.position()
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[-50.0, 0.0]
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"""
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x0, y0 = start = self._position
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x1 = x0 + distance * cos(self._angle*self._invradian)
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y1 = y0 - distance * sin(self._angle*self._invradian)
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self._goto(x1, y1)
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def backward(self, distance):
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""" Go backwards distance steps.
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The turtle's heading does not change.
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Example:
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>>> turtle.position()
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[0.0, 0.0]
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>>> turtle.backward(30)
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>>> turtle.position()
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[-30.0, 0.0]
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"""
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self.forward(-distance)
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def left(self, angle):
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""" Turn left angle units (units are by default degrees,
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but can be set via the degrees() and radians() functions.)
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When viewed from above, the turning happens in-place around
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its front tip.
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Example:
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>>> turtle.heading()
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22
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>>> turtle.left(45)
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>>> turtle.heading()
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67.0
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"""
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self._angle = (self._angle + angle) % self._fullcircle
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self._draw_turtle()
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def right(self, angle):
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""" Turn right angle units (units are by default degrees,
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but can be set via the degrees() and radians() functions.)
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When viewed from above, the turning happens in-place around
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its front tip.
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Example:
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>>> turtle.heading()
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22
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>>> turtle.right(45)
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>>> turtle.heading()
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337.0
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"""
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self.left(-angle)
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def up(self):
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""" Pull the pen up -- no drawing when moving.
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Example:
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>>> turtle.up()
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"""
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self._drawing = 0
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def down(self):
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""" Put the pen down -- draw when moving.
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Example:
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>>> turtle.down()
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"""
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self._drawing = 1
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def width(self, width):
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""" Set the line to thickness to width.
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Example:
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>>> turtle.width(10)
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"""
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self._width = float(width)
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def color(self, *args):
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""" Set the pen color.
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Three input formats are allowed:
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color(s)
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s is a Tk specification string, such as "red" or "yellow"
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color((r, g, b))
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*a tuple* of r, g, and b, which represent, an RGB color,
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and each of r, g, and b are in the range [0..1]
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color(r, g, b)
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r, g, and b represent an RGB color, and each of r, g, and b
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are in the range [0..1]
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Example:
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>>> turtle.color('brown')
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>>> tup = (0.2, 0.8, 0.55)
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>>> turtle.color(tup)
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>>> turtle.color(0, .5, 0)
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"""
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if not args:
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raise Error, "no color arguments"
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if len(args) == 1:
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color = args[0]
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if type(color) == type(""):
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# Test the color first
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try:
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id = self._canvas.create_line(0, 0, 0, 0, fill=color)
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except Tkinter.TclError:
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raise Error, "bad color string: %r" % (color,)
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self._set_color(color)
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return
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try:
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r, g, b = color
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except:
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raise Error, "bad color sequence: %r" % (color,)
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else:
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try:
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r, g, b = args
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except:
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raise Error, "bad color arguments: %r" % (args,)
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assert 0 <= r <= 1
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assert 0 <= g <= 1
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assert 0 <= b <= 1
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x = 255.0
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y = 0.5
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self._set_color("#%02x%02x%02x" % (int(r*x+y), int(g*x+y), int(b*x+y)))
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def _set_color(self,color):
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self._color = color
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self._draw_turtle()
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def write(self, text, move=False):
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""" Write text at the current pen position.
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If move is true, the pen is moved to the bottom-right corner
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of the text. By default, move is False.
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Example:
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>>> turtle.write('The race is on!')
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>>> turtle.write('Home = (0, 0)', True)
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"""
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x, y = self._position
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x = x-1 # correction -- calibrated for Windows
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item = self._canvas.create_text(x, y,
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text=str(text), anchor="sw",
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fill=self._color)
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self._items.append(item)
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if move:
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x0, y0, x1, y1 = self._canvas.bbox(item)
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self._goto(x1, y1)
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self._draw_turtle()
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def fill(self, flag):
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""" Call fill(1) before drawing the shape you
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want to fill, and fill(0) when done.
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Example:
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>>> turtle.fill(1)
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>>> turtle.forward(100)
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>>> turtle.left(90)
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>>> turtle.forward(100)
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>>> turtle.left(90)
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>>> turtle.forward(100)
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>>> turtle.left(90)
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>>> turtle.forward(100)
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>>> turtle.fill(0)
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"""
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if self._filling:
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path = tuple(self._path)
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smooth = self._filling < 0
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if len(path) > 2:
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item = self._canvas._create('polygon', path,
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{'fill': self._color,
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'smooth': smooth})
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self._items.append(item)
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self._path = []
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self._filling = flag
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if flag:
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self._path.append(self._position)
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def begin_fill(self):
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""" Called just before drawing a shape to be filled.
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Must eventually be followed by a corresponding end_fill() call.
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Otherwise it will be ignored.
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Example:
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>>> turtle.begin_fill()
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>>> turtle.forward(100)
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>>> turtle.left(90)
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>>> turtle.forward(100)
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>>> turtle.left(90)
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>>> turtle.forward(100)
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>>> turtle.left(90)
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>>> turtle.forward(100)
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>>> turtle.end_fill()
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"""
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self._path = [self._position]
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self._filling = 1
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def end_fill(self):
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""" Called after drawing a shape to be filled.
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Example:
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>>> turtle.begin_fill()
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>>> turtle.forward(100)
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>>> turtle.left(90)
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>>> turtle.forward(100)
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>>> turtle.left(90)
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>>> turtle.forward(100)
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>>> turtle.left(90)
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>>> turtle.forward(100)
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>>> turtle.end_fill()
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"""
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self.fill(0)
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def circle(self, radius, extent = None):
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""" Draw a circle with given radius.
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The center is radius units left of the turtle; extent
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determines which part of the circle is drawn. If not given,
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the entire circle is drawn.
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If extent is not a full circle, one endpoint of the arc is the
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current pen position. The arc is drawn in a counter clockwise
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direction if radius is positive, otherwise in a clockwise
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direction. In the process, the direction of the turtle is
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changed by the amount of the extent.
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>>> turtle.circle(50)
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>>> turtle.circle(120, 180) # half a circle
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"""
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if extent is None:
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extent = self._fullcircle
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frac = abs(extent)/self._fullcircle
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steps = 1+int(min(11+abs(radius)/6.0, 59.0)*frac)
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w = 1.0 * extent / steps
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w2 = 0.5 * w
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l = 2.0 * radius * sin(w2*self._invradian)
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if radius < 0:
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l, w, w2 = -l, -w, -w2
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self.left(w2)
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for i in range(steps):
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self.forward(l)
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self.left(w)
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self.right(w2)
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def heading(self):
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""" Return the turtle's current heading.
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Example:
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>>> turtle.heading()
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67.0
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"""
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return self._angle
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def setheading(self, angle):
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""" Set the turtle facing the given angle.
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Here are some common directions in degrees:
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0 - east
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90 - north
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180 - west
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270 - south
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Example:
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>>> turtle.setheading(90)
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>>> turtle.heading()
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90
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>>> turtle.setheading(128)
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>>> turtle.heading()
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128
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"""
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self._angle = angle
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self._draw_turtle()
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def window_width(self):
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""" Returns the width of the turtle window.
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Example:
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>>> turtle.window_width()
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640
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"""
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width = self._canvas.winfo_width()
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if width <= 1: # the window isn't managed by a geometry manager
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width = self._canvas['width']
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return width
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def window_height(self):
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""" Return the height of the turtle window.
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Example:
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>>> turtle.window_height()
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768
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"""
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height = self._canvas.winfo_height()
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if height <= 1: # the window isn't managed by a geometry manager
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height = self._canvas['height']
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return height
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def position(self):
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""" Return the current (x, y) location of the turtle.
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Example:
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>>> turtle.position()
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[0.0, 240.0]
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"""
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x0, y0 = self._origin
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x1, y1 = self._position
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return [x1-x0, -y1+y0]
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def setx(self, xpos):
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""" Set the turtle's x coordinate to be xpos.
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Example:
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>>> turtle.position()
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[10.0, 240.0]
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>>> turtle.setx(10)
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>>> turtle.position()
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[10.0, 240.0]
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"""
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x0, y0 = self._origin
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x1, y1 = self._position
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self._goto(x0+xpos, y1)
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def sety(self, ypos):
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""" Set the turtle's y coordinate to be ypos.
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Example:
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>>> turtle.position()
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[0.0, 0.0]
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>>> turtle.sety(-22)
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>>> turtle.position()
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[0.0, -22.0]
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"""
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x0, y0 = self._origin
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x1, y1 = self._position
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self._goto(x1, y0-ypos)
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def towards(self, *args):
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"""Returs the angle, which corresponds to the line
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from turtle-position to point (x,y).
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Argument can be two coordinates or one pair of coordinates
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or a RawPen/Pen instance.
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Example:
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>>> turtle.position()
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[10.0, 10.0]
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>>> turtle.towards(0,0)
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225.0
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"""
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if len(args) == 2:
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x, y = args
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else:
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arg = args[0]
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if isinstance(arg, RawPen):
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x, y = arg.position()
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else:
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x, y = arg
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x0, y0 = self.position()
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dx = x - x0
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dy = y - y0
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return (atan2(dy,dx) / self._invradian) % self._fullcircle
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def goto(self, *args):
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""" Go to the given point.
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If the pen is down, then a line will be drawn. The turtle's
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orientation does not change.
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Two input formats are accepted:
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goto(x, y)
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go to point (x, y)
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goto((x, y))
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go to point (x, y)
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Example:
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>>> turtle.position()
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[0.0, 0.0]
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>>> turtle.goto(50, -45)
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>>> turtle.position()
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[50.0, -45.0]
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"""
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if len(args) == 1:
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try:
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x, y = args[0]
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except:
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raise Error, "bad point argument: %r" % (args[0],)
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else:
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try:
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x, y = args
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except:
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raise Error, "bad coordinates: %r" % (args[0],)
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x0, y0 = self._origin
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self._goto(x0+x, y0-y)
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def _goto(self, x1, y1):
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x0, y0 = self._position
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self._position = map(float, (x1, y1))
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if self._filling:
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self._path.append(self._position)
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if self._drawing:
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if self._tracing:
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dx = float(x1 - x0)
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dy = float(y1 - y0)
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distance = hypot(dx, dy)
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nhops = int(distance)
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item = self._canvas.create_line(x0, y0, x0, y0,
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width=self._width,
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capstyle="round",
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fill=self._color)
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try:
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for i in range(1, 1+nhops):
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x, y = x0 + dx*i/nhops, y0 + dy*i/nhops
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self._canvas.coords(item, x0, y0, x, y)
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self._draw_turtle((x,y))
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self._canvas.update()
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self._canvas.after(self._delay)
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# in case nhops==0
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self._canvas.coords(item, x0, y0, x1, y1)
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self._canvas.itemconfigure(item, arrow="none")
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except Tkinter.TclError:
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# Probably the window was closed!
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return
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else:
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item = self._canvas.create_line(x0, y0, x1, y1,
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width=self._width,
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capstyle="round",
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fill=self._color)
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self._items.append(item)
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self._draw_turtle()
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def speed(self, speed):
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""" Set the turtle's speed.
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speed must one of these five strings:
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'fastest' is a 0 ms delay
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'fast' is a 5 ms delay
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'normal' is a 10 ms delay
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'slow' is a 15 ms delay
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'slowest' is a 20 ms delay
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Example:
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>>> turtle.speed('slow')
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"""
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try:
|
|
speed = speed.strip().lower()
|
|
self._delay = speeds.index(speed) * 5
|
|
except:
|
|
raise ValueError("%r is not a valid speed. speed must be "
|
|
"one of %s" % (speed, speeds))
|
|
|
|
|
|
def delay(self, delay):
|
|
""" Set the drawing delay in milliseconds.
|
|
|
|
This is intended to allow finer control of the drawing speed
|
|
than the speed() method
|
|
|
|
Example:
|
|
>>> turtle.delay(15)
|
|
"""
|
|
if int(delay) < 0:
|
|
raise ValueError("delay must be greater than or equal to 0")
|
|
self._delay = int(delay)
|
|
|
|
def _draw_turtle(self, position=[]):
|
|
if not self._tracing:
|
|
self._canvas.update()
|
|
return
|
|
if position == []:
|
|
position = self._position
|
|
x,y = position
|
|
distance = 8
|
|
dx = distance * cos(self._angle*self._invradian)
|
|
dy = distance * sin(self._angle*self._invradian)
|
|
self._delete_turtle()
|
|
self._arrow = self._canvas.create_line(x-dx,y+dy,x,y,
|
|
width=self._width,
|
|
arrow="last",
|
|
capstyle="round",
|
|
fill=self._color)
|
|
self._canvas.update()
|
|
|
|
def _delete_turtle(self):
|
|
if self._arrow != 0:
|
|
self._canvas.delete(self._arrow)
|
|
self._arrow = 0
|
|
|
|
|
|
_root = None
|
|
_canvas = None
|
|
_pen = None
|
|
_width = 0.50 # 50% of window width
|
|
_height = 0.75 # 75% of window height
|
|
_startx = None
|
|
_starty = None
|
|
_title = "Turtle Graphics" # default title
|
|
|
|
class Pen(RawPen):
|
|
|
|
def __init__(self):
|
|
global _root, _canvas
|
|
if _root is None:
|
|
_root = Tkinter.Tk()
|
|
_root.wm_protocol("WM_DELETE_WINDOW", self._destroy)
|
|
_root.title(_title)
|
|
|
|
if _canvas is None:
|
|
# XXX Should have scroll bars
|
|
_canvas = Tkinter.Canvas(_root, background="white")
|
|
_canvas.pack(expand=1, fill="both")
|
|
|
|
setup(width=_width, height= _height, startx=_startx, starty=_starty)
|
|
|
|
RawPen.__init__(self, _canvas)
|
|
|
|
def _destroy(self):
|
|
global _root, _canvas, _pen
|
|
root = self._canvas._root()
|
|
if root is _root:
|
|
_pen = None
|
|
_root = None
|
|
_canvas = None
|
|
root.destroy()
|
|
|
|
def _getpen():
|
|
global _pen
|
|
if not _pen:
|
|
_pen = Pen()
|
|
return _pen
|
|
|
|
class Turtle(Pen):
|
|
pass
|
|
|
|
"""For documentation of the following functions see
|
|
the RawPen methods with the same names
|
|
"""
|
|
|
|
def degrees(): _getpen().degrees()
|
|
def radians(): _getpen().radians()
|
|
def reset(): _getpen().reset()
|
|
def clear(): _getpen().clear()
|
|
def tracer(flag): _getpen().tracer(flag)
|
|
def forward(distance): _getpen().forward(distance)
|
|
def backward(distance): _getpen().backward(distance)
|
|
def left(angle): _getpen().left(angle)
|
|
def right(angle): _getpen().right(angle)
|
|
def up(): _getpen().up()
|
|
def down(): _getpen().down()
|
|
def width(width): _getpen().width(width)
|
|
def color(*args): _getpen().color(*args)
|
|
def write(arg, move=0): _getpen().write(arg, move)
|
|
def fill(flag): _getpen().fill(flag)
|
|
def begin_fill(): _getpen().begin_fill()
|
|
def end_fill(): _getpen().end_fill()
|
|
def circle(radius, extent=None): _getpen().circle(radius, extent)
|
|
def goto(*args): _getpen().goto(*args)
|
|
def heading(): return _getpen().heading()
|
|
def setheading(angle): _getpen().setheading(angle)
|
|
def position(): return _getpen().position()
|
|
def window_width(): return _getpen().window_width()
|
|
def window_height(): return _getpen().window_height()
|
|
def setx(xpos): _getpen().setx(xpos)
|
|
def sety(ypos): _getpen().sety(ypos)
|
|
def towards(*args): return _getpen().towards(*args)
|
|
|
|
def done(): _root.mainloop()
|
|
def delay(delay): return _getpen().delay(delay)
|
|
def speed(speed): return _getpen().speed(speed)
|
|
|
|
for methodname in dir(RawPen):
|
|
""" copies RawPen docstrings to module functions of same name """
|
|
if not methodname.startswith("_"):
|
|
eval(methodname).__doc__ = RawPen.__dict__[methodname].__doc__
|
|
|
|
|
|
def setup(**geometry):
|
|
""" Sets the size and position of the main window.
|
|
|
|
Keywords are width, height, startx and starty:
|
|
|
|
width: either a size in pixels or a fraction of the screen.
|
|
Default is 50% of screen.
|
|
height: either the height in pixels or a fraction of the screen.
|
|
Default is 75% of screen.
|
|
|
|
Setting either width or height to None before drawing will force
|
|
use of default geometry as in older versions of turtle.py
|
|
|
|
startx: starting position in pixels from the left edge of the screen.
|
|
Default is to center window. Setting startx to None is the default
|
|
and centers window horizontally on screen.
|
|
|
|
starty: starting position in pixels from the top edge of the screen.
|
|
Default is to center window. Setting starty to None is the default
|
|
and centers window vertically on screen.
|
|
|
|
Examples:
|
|
>>> setup (width=200, height=200, startx=0, starty=0)
|
|
|
|
sets window to 200x200 pixels, in upper left of screen
|
|
|
|
>>> setup(width=.75, height=0.5, startx=None, starty=None)
|
|
|
|
sets window to 75% of screen by 50% of screen and centers
|
|
|
|
>>> setup(width=None)
|
|
|
|
forces use of default geometry as in older versions of turtle.py
|
|
"""
|
|
|
|
global _width, _height, _startx, _starty
|
|
|
|
width = geometry.get('width',_width)
|
|
if width >= 0 or width == None:
|
|
_width = width
|
|
else:
|
|
raise ValueError, "width can not be less than 0"
|
|
|
|
height = geometry.get('height',_height)
|
|
if height >= 0 or height == None:
|
|
_height = height
|
|
else:
|
|
raise ValueError, "height can not be less than 0"
|
|
|
|
startx = geometry.get('startx', _startx)
|
|
if startx >= 0 or startx == None:
|
|
_startx = _startx
|
|
else:
|
|
raise ValueError, "startx can not be less than 0"
|
|
|
|
starty = geometry.get('starty', _starty)
|
|
if starty >= 0 or starty == None:
|
|
_starty = starty
|
|
else:
|
|
raise ValueError, "startx can not be less than 0"
|
|
|
|
|
|
if _root and _width and _height:
|
|
if 0 < _width <= 1:
|
|
_width = _root.winfo_screenwidth() * +width
|
|
if 0 < _height <= 1:
|
|
_height = _root.winfo_screenheight() * _height
|
|
|
|
# center window on screen
|
|
if _startx is None:
|
|
_startx = (_root.winfo_screenwidth() - _width) / 2
|
|
|
|
if _starty is None:
|
|
_starty = (_root.winfo_screenheight() - _height) / 2
|
|
|
|
_root.geometry("%dx%d+%d+%d" % (_width, _height, _startx, _starty))
|
|
|
|
def title(title):
|
|
"""Set the window title.
|
|
|
|
By default this is set to 'Turtle Graphics'
|
|
|
|
Example:
|
|
>>> title("My Window")
|
|
"""
|
|
|
|
global _title
|
|
_title = title
|
|
|
|
def demo():
|
|
reset()
|
|
tracer(1)
|
|
up()
|
|
backward(100)
|
|
down()
|
|
# draw 3 squares; the last filled
|
|
width(3)
|
|
for i in range(3):
|
|
if i == 2:
|
|
fill(1)
|
|
for j in range(4):
|
|
forward(20)
|
|
left(90)
|
|
if i == 2:
|
|
color("maroon")
|
|
fill(0)
|
|
up()
|
|
forward(30)
|
|
down()
|
|
width(1)
|
|
color("black")
|
|
# move out of the way
|
|
tracer(0)
|
|
up()
|
|
right(90)
|
|
forward(100)
|
|
right(90)
|
|
forward(100)
|
|
right(180)
|
|
down()
|
|
# some text
|
|
write("startstart", 1)
|
|
write("start", 1)
|
|
color("red")
|
|
# staircase
|
|
for i in range(5):
|
|
forward(20)
|
|
left(90)
|
|
forward(20)
|
|
right(90)
|
|
# filled staircase
|
|
fill(1)
|
|
for i in range(5):
|
|
forward(20)
|
|
left(90)
|
|
forward(20)
|
|
right(90)
|
|
fill(0)
|
|
tracer(1)
|
|
# more text
|
|
write("end")
|
|
|
|
def demo2():
|
|
# exercises some new and improved features
|
|
speed('fast')
|
|
width(3)
|
|
|
|
# draw a segmented half-circle
|
|
setheading(towards(0,0))
|
|
x,y = position()
|
|
r = (x**2+y**2)**.5/2.0
|
|
right(90)
|
|
pendown = True
|
|
for i in range(18):
|
|
if pendown:
|
|
up()
|
|
pendown = False
|
|
else:
|
|
down()
|
|
pendown = True
|
|
circle(r,10)
|
|
sleep(2)
|
|
|
|
reset()
|
|
left(90)
|
|
|
|
# draw a series of triangles
|
|
l = 10
|
|
color("green")
|
|
width(3)
|
|
left(180)
|
|
sp = 5
|
|
for i in range(-2,16):
|
|
if i > 0:
|
|
color(1.0-0.05*i,0,0.05*i)
|
|
fill(1)
|
|
color("green")
|
|
for j in range(3):
|
|
forward(l)
|
|
left(120)
|
|
l += 10
|
|
left(15)
|
|
if sp > 0:
|
|
sp = sp-1
|
|
speed(speeds[sp])
|
|
color(0.25,0,0.75)
|
|
fill(0)
|
|
|
|
# draw and fill a concave shape
|
|
left(120)
|
|
up()
|
|
forward(70)
|
|
right(30)
|
|
down()
|
|
color("red")
|
|
speed("fastest")
|
|
fill(1)
|
|
for i in range(4):
|
|
circle(50,90)
|
|
right(90)
|
|
forward(30)
|
|
right(90)
|
|
color("yellow")
|
|
fill(0)
|
|
left(90)
|
|
up()
|
|
forward(30)
|
|
down();
|
|
|
|
color("red")
|
|
|
|
# create a second turtle and make the original pursue and catch it
|
|
turtle=Turtle()
|
|
turtle.reset()
|
|
turtle.left(90)
|
|
turtle.speed('normal')
|
|
turtle.up()
|
|
turtle.goto(280,40)
|
|
turtle.left(24)
|
|
turtle.down()
|
|
turtle.speed('fast')
|
|
turtle.color("blue")
|
|
turtle.width(2)
|
|
speed('fastest')
|
|
|
|
# turn default turtle towards new turtle object
|
|
setheading(towards(turtle))
|
|
while ( abs(position()[0]-turtle.position()[0])>4 or
|
|
abs(position()[1]-turtle.position()[1])>4):
|
|
turtle.forward(3.5)
|
|
turtle.left(0.6)
|
|
# turn default turtle towards new turtle object
|
|
setheading(towards(turtle))
|
|
forward(4)
|
|
write("CAUGHT! ", move=True)
|
|
|
|
|
|
|
|
if __name__ == '__main__':
|
|
from time import sleep
|
|
demo()
|
|
sleep(3)
|
|
demo2()
|
|
done()
|