Personal Computer World 2009 February/PCWFEB09.iso/Software/Linux/Kubuntu 8.10/kubuntu-8.10-desktop-i386.iso/casper/filesystem.squashfs/usr/lib/python2.5/lib-tk/turtle.pyc

Python Compiled Bytecode | 2008-10-29 | 30.2 KB | 1,108 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.5)

'''
Turtle graphics is a popular way for introducing programming to
kids. It was part of the original Logo programming language developed
by Wally Feurzeig and Seymour Papert in 1966.

Imagine a robotic turtle starting at (0, 0) in the x-y plane. Give it
the command turtle.forward(15), and it moves (on-screen!) 15 pixels in
the direction it is facing, drawing a line as it moves. Give it the
command turtle.left(25), and it rotates in-place 25 degrees clockwise.

By combining together these and similar commands, intricate shapes and
pictures can easily be drawn.
'''
from math import *
from time import sleep
import Tkinter
speeds = [
    'fastest',
    'fast',
    'normal',
    'slow',
    'slowest']

class Error(Exception):
    pass


class RawPen:

    def __init__(self, canvas):
        self._canvas = canvas
        self._items = []
        self._tracing = 1
        self._arrow = 0
        self._delay = 10
        self._angle = 0
        self.degrees()
        self.reset()


    def degrees(self, fullcircle = 360):
        ''' Set angle measurement units to degrees.

        Example:
        >>> turtle.degrees()
        '''
        if self._angle:
            self._angle = (self._angle / self._fullcircle) * fullcircle

        self._fullcircle = fullcircle
        self._invradian = pi / (fullcircle * 0.5)


    def radians(self):
        ''' Set the angle measurement units to radians.

        Example:
        >>> turtle.radians()
        '''
        self.degrees(2 * pi)


    def reset(self):
        ''' Clear the screen, re-center the pen, and set variables to
        the default values.

        Example:
        >>> turtle.position()
        [0.0, -22.0]
        >>> turtle.heading()
        100.0
        >>> turtle.reset()
        >>> turtle.position()
        [0.0, 0.0]
        >>> turtle.heading()
        0.0
        '''
        canvas = self._canvas
        self._canvas.update()
        width = canvas.winfo_width()
        height = canvas.winfo_height()
        if width <= 1:
            width = canvas['width']

        if height <= 1:
            height = canvas['height']

        self._origin = (float(width) / 2, float(height) / 2)
        self._position = self._origin
        self._angle = 0
        self._drawing = 1
        self._width = 1
        self._color = 'black'
        self._filling = 0
        self._path = []
        self.clear()
        canvas._root().tkraise()


    def clear(self):
        ''' Clear the screen. The turtle does not move.

        Example:
        >>> turtle.clear()
        '''
        self.fill(0)
        canvas = self._canvas
        items = self._items
        self._items = []
        for item in items:
            canvas.delete(item)

        self._delete_turtle()
        self._draw_turtle()


    def tracer(self, flag):
        ''' Set tracing on if flag is True, and off if it is False.
        Tracing means line are drawn more slowly, with an
        animation of an arrow along the line.

        Example:
        >>> turtle.tracer(False)   # turns off Tracer
        '''
        self._tracing = flag
        if not self._tracing:
            self._delete_turtle()

        self._draw_turtle()


    def forward(self, distance):
        ''' Go forward distance steps.

        Example:
        >>> turtle.position()
        [0.0, 0.0]
        >>> turtle.forward(25)
        >>> turtle.position()
        [25.0, 0.0]
        >>> turtle.forward(-75)
        >>> turtle.position()
        [-50.0, 0.0]
        '''
        (x0, y0) = start = self._position
        x1 = x0 + distance * cos(self._angle * self._invradian)
        y1 = y0 - distance * sin(self._angle * self._invradian)
        self._goto(x1, y1)


    def backward(self, distance):
        """ Go backwards distance steps.

        The turtle's heading does not change.

        Example:
        >>> turtle.position()
        [0.0, 0.0]
        >>> turtle.backward(30)
        >>> turtle.position()
        [-30.0, 0.0]
        """
        self.forward(-distance)


    def left(self, angle):
        ''' Turn left angle units (units are by default degrees,
        but can be set via the degrees() and radians() functions.)

        When viewed from above, the turning happens in-place around
        its front tip.

        Example:
        >>> turtle.heading()
        22
        >>> turtle.left(45)
        >>> turtle.heading()
        67.0
        '''
        self._angle = (self._angle + angle) % self._fullcircle
        self._draw_turtle()


    def right(self, angle):
        ''' Turn right angle units (units are by default degrees,
        but can be set via the degrees() and radians() functions.)

        When viewed from above, the turning happens in-place around
        its front tip.

        Example:
        >>> turtle.heading()
        22
        >>> turtle.right(45)
        >>> turtle.heading()
        337.0
        '''
        self.left(-angle)


    def up(self):
        ''' Pull the pen up -- no drawing when moving.

        Example:
        >>> turtle.up()
        '''
        self._drawing = 0


    def down(self):
        ''' Put the pen down -- draw when moving.

        Example:
        >>> turtle.down()
        '''
        self._drawing = 1


    def width(self, width):
        ''' Set the line to thickness to width.

        Example:
        >>> turtle.width(10)
        '''
        self._width = float(width)


    def color(self, *args):
        ''' Set the pen color.

        Three input formats are allowed:

            color(s)
            s is a Tk specification string, such as "red" or "yellow"

            color((r, g, b))
            *a tuple* of r, g, and b, which represent, an RGB color,
            and each of r, g, and b are in the range [0..1]

            color(r, g, b)
            r, g, and b represent an RGB color, and each of r, g, and b
            are in the range [0..1]

        Example:

        >>> turtle.color(\'brown\')
        >>> tup = (0.2, 0.8, 0.55)
        >>> turtle.color(tup)
        >>> turtle.color(0, .5, 0)
        '''
        if not args:
            raise Error, 'no color arguments'

        if len(args) == 1:
            color = args[0]
            if type(color) == type(''):

                try:
                    id = self._canvas.create_line(0, 0, 0, 0, fill = color)
                except Tkinter.TclError:
                    raise Error, 'bad color string: %r' % (color,)

                self._set_color(color)
                return None


            try:
                (r, g, b) = color
            raise Error, 'bad color sequence: %r' % (color,)

        else:

            try:
                (r, g, b) = args
            except:
                raise Error, 'bad color arguments: %r' % (args,)

        if r <= r:
            pass
        elif not r <= 1:
            raise AssertionError
        if g <= g:
            pass
        elif not g <= 1:
            raise AssertionError
        if b <= b:
            pass
        elif not b <= 1:
            raise AssertionError
        x = 255
        y = 0.5
        self._set_color('#%02x%02x%02x' % (int(r * x + y), int(g * x + y), int(b * x + y)))


    def _set_color(self, color):
        self._color = color
        self._draw_turtle()


    def write(self, text, move = False):
        """ Write text at the current pen position.

        If move is true, the pen is moved to the bottom-right corner
        of the text. By default, move is False.

        Example:
        >>> turtle.write('The race is on!')
        >>> turtle.write('Home = (0, 0)', True)
        """
        (x, y) = self._position
        x = x - 1
        item = self._canvas.create_text(x, y, text = str(text), anchor = 'sw', fill = self._color)
        self._items.append(item)
        if move:
            (x0, y0, x1, y1) = self._canvas.bbox(item)
            self._goto(x1, y1)

        self._draw_turtle()


    def fill(self, flag):
        ''' Call fill(1) before drawing the shape you
         want to fill, and fill(0) when done.

        Example:
        >>> turtle.fill(1)
        >>> turtle.forward(100)
        >>> turtle.left(90)
        >>> turtle.forward(100)
        >>> turtle.left(90)
        >>> turtle.forward(100)
        >>> turtle.left(90)
        >>> turtle.forward(100)
        >>> turtle.fill(0)
        '''
        if self._filling:
            path = tuple(self._path)
            smooth = self._filling < 0
            if len(path) > 2:
                item = self._canvas._create('polygon', path, {
                    'fill': self._color,
                    'smooth': smooth })
                self._items.append(item)
                self._canvas.update()


        self._path = []
        self._filling = flag
        if flag:
            self._path.append(self._position)



    def begin_fill(self):
        ''' Called just before drawing a shape to be filled.
            Must eventually be followed by a corresponding end_fill() call.
            Otherwise it will be ignored.

        Example:
        >>> turtle.begin_fill()
        >>> turtle.forward(100)
        >>> turtle.left(90)
        >>> turtle.forward(100)
        >>> turtle.left(90)
        >>> turtle.forward(100)
        >>> turtle.left(90)
        >>> turtle.forward(100)
        >>> turtle.end_fill()
        '''
        self._path = [
            self._position]
        self._filling = 1


    def end_fill(self):
        ''' Called after drawing a shape to be filled.

        Example:
        >>> turtle.begin_fill()
        >>> turtle.forward(100)
        >>> turtle.left(90)
        >>> turtle.forward(100)
        >>> turtle.left(90)
        >>> turtle.forward(100)
        >>> turtle.left(90)
        >>> turtle.forward(100)
        >>> turtle.end_fill()
        '''
        self.fill(0)


    def circle(self, radius, extent = None):
        ''' Draw a circle with given radius.
        The center is radius units left of the turtle; extent
        determines which part of the circle is drawn. If not given,
        the entire circle is drawn.

        If extent is not a full circle, one endpoint of the arc is the
        current pen position. The arc is drawn in a counter clockwise
        direction if radius is positive, otherwise in a clockwise
        direction. In the process, the direction of the turtle is
        changed by the amount of the extent.

        >>> turtle.circle(50)
        >>> turtle.circle(120, 180)  # half a circle
        '''
        if extent is None:
            extent = self._fullcircle

        frac = abs(extent) / self._fullcircle
        steps = 1 + int(min(11 + abs(radius) / 6, 59) * frac)
        w = 1 * extent / steps
        w2 = 0.5 * w
        l = 2 * radius * sin(w2 * self._invradian)
        if radius < 0:
            l = -l
            w = -w
            w2 = -w2

        self.left(w2)
        for i in range(steps):
            self.forward(l)
            self.left(w)

        self.right(w2)


    def heading(self):
        """ Return the turtle's current heading.

        Example:
        >>> turtle.heading()
        67.0
        """
        return self._angle


    def setheading(self, angle):
        ''' Set the turtle facing the given angle.

        Here are some common directions in degrees:

           0 - east
          90 - north
         180 - west
         270 - south

        Example:
        >>> turtle.setheading(90)
        >>> turtle.heading()
        90
        >>> turtle.setheading(128)
        >>> turtle.heading()
        128
        '''
        self._angle = angle
        self._draw_turtle()


    def window_width(self):
        ''' Returns the width of the turtle window.

        Example:
        >>> turtle.window_width()
        640
        '''
        width = self._canvas.winfo_width()
        if width <= 1:
            width = self._canvas['width']

        return width


    def window_height(self):
        ''' Return the height of the turtle window.

        Example:
        >>> turtle.window_height()
        768
        '''
        height = self._canvas.winfo_height()
        if height <= 1:
            height = self._canvas['height']

        return height


    def position(self):
        ''' Return the current (x, y) location of the turtle.

        Example:
        >>> turtle.position()
        [0.0, 240.0]
        '''
        (x0, y0) = self._origin
        (x1, y1) = self._position
        return [
            x1 - x0,
            -y1 + y0]


    def setx(self, xpos):
        """ Set the turtle's x coordinate to be xpos.

        Example:
        >>> turtle.position()
        [10.0, 240.0]
        >>> turtle.setx(10)
        >>> turtle.position()
        [10.0, 240.0]
        """
        (x0, y0) = self._origin
        (x1, y1) = self._position
        self._goto(x0 + xpos, y1)


    def sety(self, ypos):
        """ Set the turtle's y coordinate to be ypos.

        Example:
        >>> turtle.position()
        [0.0, 0.0]
        >>> turtle.sety(-22)
        >>> turtle.position()
        [0.0, -22.0]
        """
        (x0, y0) = self._origin
        (x1, y1) = self._position
        self._goto(x1, y0 - ypos)


    def towards(self, *args):
        '''Returs the angle, which corresponds to the line
        from turtle-position to point (x,y).

        Argument can be two coordinates or one pair of coordinates
        or a RawPen/Pen instance.

        Example:
        >>> turtle.position()
        [10.0, 10.0]
        >>> turtle.towards(0,0)
        225.0
        '''
        if len(args) == 2:
            (x, y) = args
        else:
            arg = args[0]
            if isinstance(arg, RawPen):
                (x, y) = arg.position()
            else:
                (x, y) = arg
        (x0, y0) = self.position()
        dx = x - x0
        dy = y - y0
        return atan2(dy, dx) / self._invradian % self._fullcircle


    def goto(self, *args):
        """ Go to the given point.

        If the pen is down, then a line will be drawn. The turtle's
        orientation does not change.

        Two input formats are accepted:

           goto(x, y)
           go to point (x, y)

           goto((x, y))
           go to point (x, y)

        Example:
        >>> turtle.position()
        [0.0, 0.0]
        >>> turtle.goto(50, -45)
        >>> turtle.position()
        [50.0, -45.0]
        """
        if len(args) == 1:

            try:
                (x, y) = args[0]
            raise Error, 'bad point argument: %r' % (args[0],)

        else:

            try:
                (x, y) = args
            except:
                raise Error, 'bad coordinates: %r' % (args[0],)

        (x0, y0) = self._origin
        self._goto(x0 + x, y0 - y)


    def _goto(self, x1, y1):
        (x0, y0) = self._position
        self._position = map(float, (x1, y1))
        if self._filling:
            self._path.append(self._position)

        if self._drawing:
            if self._tracing:
                dx = float(x1 - x0)
                dy = float(y1 - y0)
                distance = hypot(dx, dy)
                nhops = int(distance)
                item = self._canvas.create_line(x0, y0, x0, y0, width = self._width, capstyle = 'round', fill = self._color)

                try:
                    for i in range(1, 1 + nhops):
                        x = x0 + dx * i / nhops
                        y = y0 + dy * i / nhops
                        self._canvas.coords(item, x0, y0, x, y)
                        self._draw_turtle((x, y))
                        self._canvas.update()
                        self._canvas.after(self._delay)

                    self._canvas.coords(item, x0, y0, x1, y1)
                    self._canvas.itemconfigure(item, arrow = 'none')
                except Tkinter.TclError:
                    return None
                except:
                    None<EXCEPTION MATCH>Tkinter.TclError


            None<EXCEPTION MATCH>Tkinter.TclError
            item = self._canvas.create_line(x0, y0, x1, y1, width = self._width, capstyle = 'round', fill = self._color)
            self._items.append(item)

        self._draw_turtle()


    def speed(self, speed):
        """ Set the turtle's speed.

        speed must one of these five strings:

            'fastest' is a 0 ms delay
            'fast' is a 5 ms delay
            'normal' is a 10 ms delay
            'slow' is a 15 ms delay
            'slowest' is a 20 ms delay

         Example:
         >>> turtle.speed('slow')
        """

        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 None

        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 = 0.5
_height = 0.75
_startx = None
_starty = None
_title = 'Turtle Graphics'

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:
            _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 _pen, _root, _canvas
        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


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):
    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, _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 _width < _width:
            pass
        elif _width <= 1:
            _width = _root.winfo_screenwidth() * +width

        if _height < _height:
            pass
        elif _height <= 1:
            _height = _root.winfo_screenheight() * _height

        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()
    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')
    tracer(0)
    up()
    right(90)
    forward(100)
    right(90)
    forward(100)
    right(180)
    down()
    write('startstart', 1)
    write('start', 1)
    color('red')
    for i in range(5):
        forward(20)
        left(90)
        forward(20)
        right(90)

    fill(1)
    for i in range(5):
        forward(20)
        left(90)
        forward(20)
        right(90)

    fill(0)
    tracer(1)
    write('end')


def demo2():
    speed('fast')
    width(3)
    setheading(towards(0, 0))
    (x, y) = position()
    r = (x ** 2 + y ** 2) ** 0.5 / 2
    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)
    l = 10
    color('green')
    width(3)
    left(180)
    sp = 5
    for i in range(-2, 16):
        if i > 0:
            color(1 - 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])
            continue

    color(0.25, 0, 0.75)
    fill(0)
    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')
    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')
    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)
        setheading(towards(turtle))
        forward(4)
    write('CAUGHT! ', move = True)

if __name__ == '__main__':
    demo()
    sleep(3)
    demo2()
    done()