python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Lib/turtledemo/__init__.py

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+"""
+    --------------------------------------
+        About this viewer
+    --------------------------------------
+
+    Tiny demo viewer to view turtle graphics example scripts.
+
+    Quickly and dirtyly assembled by Gregor Lingl.
+    June, 2006
+
+    For more information see: turtledemo - Help
+
+    Have fun!
+"""

third_party/python/Lib/turtledemo/__main__.py

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+#!/usr/bin/env python3
+
+"""
+  ----------------------------------------------
+      turtleDemo - Help
+  ----------------------------------------------
+
+  This document has two sections:
+
+  (1) How to use the demo viewer
+  (2) How to add your own demos to the demo repository
+
+
+  (1) How to use the demo viewer.
+
+  Select a demoscript from the example menu.
+  The (syntax colored) source code appears in the left
+  source code window. IT CANNOT BE EDITED, but ONLY VIEWED!
+
+  The demo viewer windows can be resized. The divider between text
+  and canvas can be moved by grabbing it with the mouse. The text font
+  size can be changed from the menu and with Control/Command '-'/'+'.
+  It can also be changed on most systems with Control-mousewheel
+  when the mouse is over the text.
+
+  Press START button to start the demo.
+  Stop execution by pressing the STOP button.
+  Clear screen by pressing the CLEAR button.
+  Restart by pressing the START button again.
+
+  SPECIAL demos, such as clock.py are those which run EVENTDRIVEN.
+
+      Press START button to start the demo.
+
+      - Until the EVENTLOOP is entered everything works
+      as in an ordinary demo script.
+
+      - When the EVENTLOOP is entered, you control the
+      application by using the mouse and/or keys (or it's
+      controlled by some timer events)
+      To stop it you can and must press the STOP button.
+
+      While the EVENTLOOP is running, the examples menu is disabled.
+
+      - Only after having pressed the STOP button, you may
+      restart it or choose another example script.
+
+   * * * * * * * *
+   In some rare situations there may occur interferences/conflicts
+   between events concerning the demo script and those concerning the
+   demo-viewer. (They run in the same process.) Strange behaviour may be
+   the consequence and in the worst case you must close and restart the
+   viewer.
+   * * * * * * * *
+
+
+   (2) How to add your own demos to the demo repository
+
+   - Place the file in the same directory as turtledemo/__main__.py
+     IMPORTANT! When imported, the demo should not modify the system
+     by calling functions in other modules, such as sys, tkinter, or
+     turtle. Global variables should be initialized in main().
+
+   - The code must contain a main() function which will
+     be executed by the viewer (see provided example scripts).
+     It may return a string which will be displayed in the Label below
+     the source code window (when execution has finished.)
+
+   - In order to run mydemo.py by itself, such as during development,
+     add the following at the end of the file:
+
+    if __name__ == '__main__':
+        main()
+        mainloop()  # keep window open
+
+    python -m turtledemo.mydemo  # will then run it
+
+   - If the demo is EVENT DRIVEN, main must return the string
+     "EVENTLOOP". This informs the demo viewer that the script is
+     still running and must be stopped by the user!
+
+     If an "EVENTLOOP" demo runs by itself, as with clock, which uses
+     ontimer, or minimal_hanoi, which loops by recursion, then the
+     code should catch the turtle.Terminator exception that will be
+     raised when the user presses the STOP button.  (Paint is not such
+     a demo; it only acts in response to mouse clicks and movements.)
+"""
+import sys
+import os
+
+from tkinter import *
+from idlelib.colorizer import ColorDelegator, color_config
+from idlelib.percolator import Percolator
+from idlelib.textview import view_text
+from turtledemo import __doc__ as about_turtledemo
+
+import turtle
+
+demo_dir = os.path.dirname(os.path.abspath(__file__))
+darwin = sys.platform == 'darwin'
+
+STARTUP = 1
+READY = 2
+RUNNING = 3
+DONE = 4
+EVENTDRIVEN = 5
+
+menufont = ("Arial", 12, NORMAL)
+btnfont = ("Arial", 12, 'bold')
+txtfont = ['Lucida Console', 10, 'normal']
+
+MINIMUM_FONT_SIZE = 6
+MAXIMUM_FONT_SIZE = 100
+font_sizes = [8, 9, 10, 11, 12, 14, 18, 20, 22, 24, 30]
+
+def getExampleEntries():
+    return [entry[:-3] for entry in os.listdir(demo_dir) if
+            entry.endswith(".py") and entry[0] != '_']
+
+help_entries = (  # (help_label,  help_doc)
+    ('Turtledemo help', __doc__),
+    ('About turtledemo', about_turtledemo),
+    ('About turtle module', turtle.__doc__),
+    )
+
+
+
+class DemoWindow(object):
+
+    def __init__(self, filename=None):
+        self.root = root = turtle._root = Tk()
+        root.title('Python turtle-graphics examples')
+        root.wm_protocol("WM_DELETE_WINDOW", self._destroy)
+
+        if darwin:
+            import subprocess
+            # Make sure we are the currently activated OS X application
+            # so that our menu bar appears.
+            subprocess.run(
+                    [
+                        'osascript',
+                        '-e', 'tell application "System Events"',
+                        '-e', 'set frontmost of the first process whose '
+                              'unix id is {} to true'.format(os.getpid()),
+                        '-e', 'end tell',
+                    ],
+                    stderr=subprocess.DEVNULL,
+                    stdout=subprocess.DEVNULL,)
+
+        root.grid_rowconfigure(0, weight=1)
+        root.grid_columnconfigure(0, weight=1)
+        root.grid_columnconfigure(1, minsize=90, weight=1)
+        root.grid_columnconfigure(2, minsize=90, weight=1)
+        root.grid_columnconfigure(3, minsize=90, weight=1)
+
+        self.mBar = Menu(root, relief=RAISED, borderwidth=2)
+        self.mBar.add_cascade(menu=self.makeLoadDemoMenu(self.mBar),
+                              label='Examples', underline=0)
+        self.mBar.add_cascade(menu=self.makeFontMenu(self.mBar),
+                              label='Fontsize', underline=0)
+        self.mBar.add_cascade(menu=self.makeHelpMenu(self.mBar),
+                              label='Help', underline=0)
+        root['menu'] = self.mBar
+
+        pane = PanedWindow(orient=HORIZONTAL, sashwidth=5,
+                           sashrelief=SOLID, bg='#ddd')
+        pane.add(self.makeTextFrame(pane))
+        pane.add(self.makeGraphFrame(pane))
+        pane.grid(row=0, columnspan=4, sticky='news')
+
+        self.output_lbl = Label(root, height= 1, text=" --- ", bg="#ddf",
+                                font=("Arial", 16, 'normal'), borderwidth=2,
+                                relief=RIDGE)
+        self.start_btn = Button(root, text=" START ", font=btnfont,
+                                fg="white", disabledforeground = "#fed",
+                                command=self.startDemo)
+        self.stop_btn = Button(root, text=" STOP ", font=btnfont,
+                               fg="white", disabledforeground = "#fed",
+                               command=self.stopIt)
+        self.clear_btn = Button(root, text=" CLEAR ", font=btnfont,
+                                fg="white", disabledforeground="#fed",
+                                command = self.clearCanvas)
+        self.output_lbl.grid(row=1, column=0, sticky='news', padx=(0,5))
+        self.start_btn.grid(row=1, column=1, sticky='ew')
+        self.stop_btn.grid(row=1, column=2, sticky='ew')
+        self.clear_btn.grid(row=1, column=3, sticky='ew')
+
+        Percolator(self.text).insertfilter(ColorDelegator())
+        self.dirty = False
+        self.exitflag = False
+        if filename:
+            self.loadfile(filename)
+        self.configGUI(DISABLED, DISABLED, DISABLED,
+                       "Choose example from menu", "black")
+        self.state = STARTUP
+
+
+    def onResize(self, event):
+        cwidth = self._canvas.winfo_width()
+        cheight = self._canvas.winfo_height()
+        self._canvas.xview_moveto(0.5*(self.canvwidth-cwidth)/self.canvwidth)
+        self._canvas.yview_moveto(0.5*(self.canvheight-cheight)/self.canvheight)
+
+    def makeTextFrame(self, root):
+        self.text_frame = text_frame = Frame(root)
+        self.text = text = Text(text_frame, name='text', padx=5,
+                                wrap='none', width=45)
+        color_config(text)
+
+        self.vbar = vbar = Scrollbar(text_frame, name='vbar')
+        vbar['command'] = text.yview
+        vbar.pack(side=LEFT, fill=Y)
+        self.hbar = hbar = Scrollbar(text_frame, name='hbar', orient=HORIZONTAL)
+        hbar['command'] = text.xview
+        hbar.pack(side=BOTTOM, fill=X)
+        text['yscrollcommand'] = vbar.set
+        text['xscrollcommand'] = hbar.set
+
+        text['font'] = tuple(txtfont)
+        shortcut = 'Command' if darwin else 'Control'
+        text.bind_all('<%s-minus>' % shortcut, self.decrease_size)
+        text.bind_all('<%s-underscore>' % shortcut, self.decrease_size)
+        text.bind_all('<%s-equal>' % shortcut, self.increase_size)
+        text.bind_all('<%s-plus>' % shortcut, self.increase_size)
+        text.bind('<Control-MouseWheel>', self.update_mousewheel)
+        text.bind('<Control-Button-4>', self.increase_size)
+        text.bind('<Control-Button-5>', self.decrease_size)
+
+        text.pack(side=LEFT, fill=BOTH, expand=1)
+        return text_frame
+
+    def makeGraphFrame(self, root):
+        turtle._Screen._root = root
+        self.canvwidth = 1000
+        self.canvheight = 800
+        turtle._Screen._canvas = self._canvas = canvas = turtle.ScrolledCanvas(
+                root, 800, 600, self.canvwidth, self.canvheight)
+        canvas.adjustScrolls()
+        canvas._rootwindow.bind('<Configure>', self.onResize)
+        canvas._canvas['borderwidth'] = 0
+
+        self.screen = _s_ = turtle.Screen()
+        turtle.TurtleScreen.__init__(_s_, _s_._canvas)
+        self.scanvas = _s_._canvas
+        turtle.RawTurtle.screens = [_s_]
+        return canvas
+
+    def set_txtsize(self, size):
+        txtfont[1] = size
+        self.text['font'] = tuple(txtfont)
+        self.output_lbl['text'] = 'Font size %d' % size
+
+    def decrease_size(self, dummy=None):
+        self.set_txtsize(max(txtfont[1] - 1, MINIMUM_FONT_SIZE))
+        return 'break'
+
+    def increase_size(self, dummy=None):
+        self.set_txtsize(min(txtfont[1] + 1, MAXIMUM_FONT_SIZE))
+        return 'break'
+
+    def update_mousewheel(self, event):
+        # For wheel up, event.delta = 120 on Windows, -1 on darwin.
+        # X-11 sends Control-Button-4 event instead.
+        if (event.delta < 0) == (not darwin):
+            return self.decrease_size()
+        else:
+            return self.increase_size()
+
+    def configGUI(self, start, stop, clear, txt="", color="blue"):
+        self.start_btn.config(state=start,
+                              bg="#d00" if start == NORMAL else "#fca")
+        self.stop_btn.config(state=stop,
+                             bg="#d00" if stop == NORMAL else "#fca")
+        self.clear_btn.config(state=clear,
+                              bg="#d00" if clear == NORMAL else"#fca")
+        self.output_lbl.config(text=txt, fg=color)
+
+    def makeLoadDemoMenu(self, master):
+        menu = Menu(master)
+
+        for entry in getExampleEntries():
+            def load(entry=entry):
+                self.loadfile(entry)
+            menu.add_command(label=entry, underline=0,
+                             font=menufont, command=load)
+        return menu
+
+    def makeFontMenu(self, master):
+        menu = Menu(master)
+        menu.add_command(label="Decrease (C-'-')", command=self.decrease_size,
+                         font=menufont)
+        menu.add_command(label="Increase (C-'+')", command=self.increase_size,
+                         font=menufont)
+        menu.add_separator()
+
+        for size in font_sizes:
+            def resize(size=size):
+                self.set_txtsize(size)
+            menu.add_command(label=str(size), underline=0,
+                             font=menufont, command=resize)
+        return menu
+
+    def makeHelpMenu(self, master):
+        menu = Menu(master)
+
+        for help_label, help_file in help_entries:
+            def show(help_label=help_label, help_file=help_file):
+                view_text(self.root, help_label, help_file)
+            menu.add_command(label=help_label, font=menufont, command=show)
+        return menu
+
+    def refreshCanvas(self):
+        if self.dirty:
+            self.screen.clear()
+            self.dirty=False
+
+    def loadfile(self, filename):
+        self.clearCanvas()
+        turtle.TurtleScreen._RUNNING = False
+        modname = 'turtledemo.' + filename
+        __import__(modname)
+        self.module = sys.modules[modname]
+        with open(self.module.__file__, 'r') as f:
+            chars = f.read()
+        self.text.delete("1.0", "end")
+        self.text.insert("1.0", chars)
+        self.root.title(filename + " - a Python turtle graphics example")
+        self.configGUI(NORMAL, DISABLED, DISABLED,
+                       "Press start button", "red")
+        self.state = READY
+
+    def startDemo(self):
+        self.refreshCanvas()
+        self.dirty = True
+        turtle.TurtleScreen._RUNNING = True
+        self.configGUI(DISABLED, NORMAL, DISABLED,
+                       "demo running...", "black")
+        self.screen.clear()
+        self.screen.mode("standard")
+        self.state = RUNNING
+
+        try:
+            result = self.module.main()
+            if result == "EVENTLOOP":
+                self.state = EVENTDRIVEN
+            else:
+                self.state = DONE
+        except turtle.Terminator:
+            if self.root is None:
+                return
+            self.state = DONE
+            result = "stopped!"
+        if self.state == DONE:
+            self.configGUI(NORMAL, DISABLED, NORMAL,
+                           result)
+        elif self.state == EVENTDRIVEN:
+            self.exitflag = True
+            self.configGUI(DISABLED, NORMAL, DISABLED,
+                           "use mouse/keys or STOP", "red")
+
+    def clearCanvas(self):
+        self.refreshCanvas()
+        self.screen._delete("all")
+        self.scanvas.config(cursor="")
+        self.configGUI(NORMAL, DISABLED, DISABLED)
+
+    def stopIt(self):
+        if self.exitflag:
+            self.clearCanvas()
+            self.exitflag = False
+            self.configGUI(NORMAL, DISABLED, DISABLED,
+                           "STOPPED!", "red")
+        turtle.TurtleScreen._RUNNING = False
+
+    def _destroy(self):
+        turtle.TurtleScreen._RUNNING = False
+        self.root.destroy()
+        self.root = None
+
+
+def main():
+    demo = DemoWindow()
+    demo.root.mainloop()
+
+if __name__ == '__main__':
+    main()

third_party/python/Lib/turtledemo/bytedesign.py

@@ -0,0 +1,161 @@
+#!/usr/bin/env python3
+"""      turtle-example-suite:
+
+        tdemo_bytedesign.py
+
+An example adapted from the example-suite
+of PythonCard's turtle graphics.
+
+It's based on an article in BYTE magazine
+Problem Solving with Logo: Using Turtle
+Graphics to Redraw a Design
+November 1982, p. 118 - 134
+
+-------------------------------------------
+
+Due to the statement
+
+t.delay(0)
+
+in line 152, which sets the animation delay
+to 0, this animation runs in "line per line"
+mode as fast as possible.
+"""
+
+from turtle import Turtle, mainloop
+from time import clock
+
+# wrapper for any additional drawing routines
+# that need to know about each other
+class Designer(Turtle):
+
+    def design(self, homePos, scale):
+        self.up()
+        for i in range(5):
+            self.forward(64.65 * scale)
+            self.down()
+            self.wheel(self.position(), scale)
+            self.up()
+            self.backward(64.65 * scale)
+            self.right(72)
+        self.up()
+        self.goto(homePos)
+        self.right(36)
+        self.forward(24.5 * scale)
+        self.right(198)
+        self.down()
+        self.centerpiece(46 * scale, 143.4, scale)
+        self.getscreen().tracer(True)
+
+    def wheel(self, initpos, scale):
+        self.right(54)
+        for i in range(4):
+            self.pentpiece(initpos, scale)
+        self.down()
+        self.left(36)
+        for i in range(5):
+            self.tripiece(initpos, scale)
+        self.left(36)
+        for i in range(5):
+            self.down()
+            self.right(72)
+            self.forward(28 * scale)
+            self.up()
+            self.backward(28 * scale)
+        self.left(54)
+        self.getscreen().update()
+
+    def tripiece(self, initpos, scale):
+        oldh = self.heading()
+        self.down()
+        self.backward(2.5 * scale)
+        self.tripolyr(31.5 * scale, scale)
+        self.up()
+        self.goto(initpos)
+        self.setheading(oldh)
+        self.down()
+        self.backward(2.5 * scale)
+        self.tripolyl(31.5 * scale, scale)
+        self.up()
+        self.goto(initpos)
+        self.setheading(oldh)
+        self.left(72)
+        self.getscreen().update()
+
+    def pentpiece(self, initpos, scale):
+        oldh = self.heading()
+        self.up()
+        self.forward(29 * scale)
+        self.down()
+        for i in range(5):
+            self.forward(18 * scale)
+            self.right(72)
+        self.pentr(18 * scale, 75, scale)
+        self.up()
+        self.goto(initpos)
+        self.setheading(oldh)
+        self.forward(29 * scale)
+        self.down()
+        for i in range(5):
+            self.forward(18 * scale)
+            self.right(72)
+        self.pentl(18 * scale, 75, scale)
+        self.up()
+        self.goto(initpos)
+        self.setheading(oldh)
+        self.left(72)
+        self.getscreen().update()
+
+    def pentl(self, side, ang, scale):
+        if side < (2 * scale): return
+        self.forward(side)
+        self.left(ang)
+        self.pentl(side - (.38 * scale), ang, scale)
+
+    def pentr(self, side, ang, scale):
+        if side < (2 * scale): return
+        self.forward(side)
+        self.right(ang)
+        self.pentr(side - (.38 * scale), ang, scale)
+
+    def tripolyr(self, side, scale):
+        if side < (4 * scale): return
+        self.forward(side)
+        self.right(111)
+        self.forward(side / 1.78)
+        self.right(111)
+        self.forward(side / 1.3)
+        self.right(146)
+        self.tripolyr(side * .75, scale)
+
+    def tripolyl(self, side, scale):
+        if side < (4 * scale): return
+        self.forward(side)
+        self.left(111)
+        self.forward(side / 1.78)
+        self.left(111)
+        self.forward(side / 1.3)
+        self.left(146)
+        self.tripolyl(side * .75, scale)
+
+    def centerpiece(self, s, a, scale):
+        self.forward(s); self.left(a)
+        if s < (7.5 * scale):
+            return
+        self.centerpiece(s - (1.2 * scale), a, scale)
+
+def main():
+    t = Designer()
+    t.speed(0)
+    t.hideturtle()
+    t.getscreen().delay(0)
+    t.getscreen().tracer(0)
+    at = clock()
+    t.design(t.position(), 2)
+    et = clock()
+    return "runtime: %.2f sec." % (et-at)
+
+if __name__ == '__main__':
+    msg = main()
+    print(msg)
+    mainloop()

third_party/python/Lib/turtledemo/chaos.py

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+# File: tdemo_chaos.py
+# Author: Gregor Lingl
+# Date: 2009-06-24
+
+# A demonstration of chaos
+
+from turtle import *
+
+N = 80
+
+def f(x):
+    return 3.9*x*(1-x)
+
+def g(x):
+    return 3.9*(x-x**2)
+
+def h(x):
+    return 3.9*x-3.9*x*x
+
+def jumpto(x, y):
+    penup(); goto(x,y)
+
+def line(x1, y1, x2, y2):
+    jumpto(x1, y1)
+    pendown()
+    goto(x2, y2)
+
+def coosys():
+    line(-1, 0, N+1, 0)
+    line(0, -0.1, 0, 1.1)
+
+def plot(fun, start, color):
+    pencolor(color)
+    x = start
+    jumpto(0, x)
+    pendown()
+    dot(5)
+    for i in range(N):
+        x=fun(x)
+        goto(i+1,x)
+        dot(5)
+
+def main():
+    reset()
+    setworldcoordinates(-1.0,-0.1, N+1, 1.1)
+    speed(0)
+    hideturtle()
+    coosys()
+    plot(f, 0.35, "blue")
+    plot(g, 0.35, "green")
+    plot(h, 0.35, "red")
+    # Now zoom in:
+    for s in range(100):
+        setworldcoordinates(0.5*s,-0.1, N+1, 1.1)
+    return "Done!"
+
+if __name__ == "__main__":
+    main()
+    mainloop()

third_party/python/Lib/turtledemo/clock.py

@@ -0,0 +1,132 @@
+#!/usr/bin/env python3
+# -*- coding: cp1252 -*-
+"""       turtle-example-suite:
+
+             tdemo_clock.py
+
+Enhanced clock-program, showing date
+and time
+  ------------------------------------
+   Press STOP to exit the program!
+  ------------------------------------
+"""
+from turtle import *
+from datetime import datetime
+
+def jump(distanz, winkel=0):
+    penup()
+    right(winkel)
+    forward(distanz)
+    left(winkel)
+    pendown()
+
+def hand(laenge, spitze):
+    fd(laenge*1.15)
+    rt(90)
+    fd(spitze/2.0)
+    lt(120)
+    fd(spitze)
+    lt(120)
+    fd(spitze)
+    lt(120)
+    fd(spitze/2.0)
+
+def make_hand_shape(name, laenge, spitze):
+    reset()
+    jump(-laenge*0.15)
+    begin_poly()
+    hand(laenge, spitze)
+    end_poly()
+    hand_form = get_poly()
+    register_shape(name, hand_form)
+
+def clockface(radius):
+    reset()
+    pensize(7)
+    for i in range(60):
+        jump(radius)
+        if i % 5 == 0:
+            fd(25)
+            jump(-radius-25)
+        else:
+            dot(3)
+            jump(-radius)
+        rt(6)
+
+def setup():
+    global second_hand, minute_hand, hour_hand, writer
+    mode("logo")
+    make_hand_shape("second_hand", 125, 25)
+    make_hand_shape("minute_hand",  130, 25)
+    make_hand_shape("hour_hand", 90, 25)
+    clockface(160)
+    second_hand = Turtle()
+    second_hand.shape("second_hand")
+    second_hand.color("gray20", "gray80")
+    minute_hand = Turtle()
+    minute_hand.shape("minute_hand")
+    minute_hand.color("blue1", "red1")
+    hour_hand = Turtle()
+    hour_hand.shape("hour_hand")
+    hour_hand.color("blue3", "red3")
+    for hand in second_hand, minute_hand, hour_hand:
+        hand.resizemode("user")
+        hand.shapesize(1, 1, 3)
+        hand.speed(0)
+    ht()
+    writer = Turtle()
+    #writer.mode("logo")
+    writer.ht()
+    writer.pu()
+    writer.bk(85)
+
+def wochentag(t):
+    wochentag = ["Monday", "Tuesday", "Wednesday",
+        "Thursday", "Friday", "Saturday", "Sunday"]
+    return wochentag[t.weekday()]
+
+def datum(z):
+    monat = ["Jan.", "Feb.", "Mar.", "Apr.", "May", "June",
+             "July", "Aug.", "Sep.", "Oct.", "Nov.", "Dec."]
+    j = z.year
+    m = monat[z.month - 1]
+    t = z.day
+    return "%s %d %d" % (m, t, j)
+
+def tick():
+    t = datetime.today()
+    sekunde = t.second + t.microsecond*0.000001
+    minute = t.minute + sekunde/60.0
+    stunde = t.hour + minute/60.0
+    try:
+        tracer(False)  # Terminator can occur here
+        writer.clear()
+        writer.home()
+        writer.forward(65)
+        writer.write(wochentag(t),
+                     align="center", font=("Courier", 14, "bold"))
+        writer.back(150)
+        writer.write(datum(t),
+                     align="center", font=("Courier", 14, "bold"))
+        writer.forward(85)
+        tracer(True)
+        second_hand.setheading(6*sekunde)  # or here
+        minute_hand.setheading(6*minute)
+        hour_hand.setheading(30*stunde)
+        tracer(True)
+        ontimer(tick, 100)
+    except Terminator:
+        pass  # turtledemo user pressed STOP
+
+def main():
+    tracer(False)
+    setup()
+    tracer(True)
+    tick()
+    return "EVENTLOOP"
+
+if __name__ == "__main__":
+    mode("logo")
+    msg = main()
+    print(msg)
+    mainloop()

third_party/python/Lib/turtledemo/colormixer.py

@@ -0,0 +1,58 @@
+# colormixer
+
+from turtle import Screen, Turtle, mainloop
+
+class ColorTurtle(Turtle):
+
+    def __init__(self, x, y):
+        Turtle.__init__(self)
+        self.shape("turtle")
+        self.resizemode("user")
+        self.shapesize(3,3,5)
+        self.pensize(10)
+        self._color = [0,0,0]
+        self.x = x
+        self._color[x] = y
+        self.color(self._color)
+        self.speed(0)
+        self.left(90)
+        self.pu()
+        self.goto(x,0)
+        self.pd()
+        self.sety(1)
+        self.pu()
+        self.sety(y)
+        self.pencolor("gray25")
+        self.ondrag(self.shift)
+
+    def shift(self, x, y):
+        self.sety(max(0,min(y,1)))
+        self._color[self.x] = self.ycor()
+        self.fillcolor(self._color)
+        setbgcolor()
+
+def setbgcolor():
+    screen.bgcolor(red.ycor(), green.ycor(), blue.ycor())
+
+def main():
+    global screen, red, green, blue
+    screen = Screen()
+    screen.delay(0)
+    screen.setworldcoordinates(-1, -0.3, 3, 1.3)
+
+    red = ColorTurtle(0, .5)
+    green = ColorTurtle(1, .5)
+    blue = ColorTurtle(2, .5)
+    setbgcolor()
+
+    writer = Turtle()
+    writer.ht()
+    writer.pu()
+    writer.goto(1,1.15)
+    writer.write("DRAG!",align="center",font=("Arial",30,("bold","italic")))
+    return "EVENTLOOP"
+
+if __name__ == "__main__":
+    msg = main()
+    print(msg)
+    mainloop()

third_party/python/Lib/turtledemo/forest.py

@@ -0,0 +1,108 @@
+#!/usr/bin/env python3
+"""     turtlegraphics-example-suite:
+
+             tdemo_forest.py
+
+Displays a 'forest' of 3 breadth-first-trees
+similar to the one in tree.
+For further remarks see tree.py
+
+This example is a 'breadth-first'-rewrite of
+a Logo program written by Erich Neuwirth. See
+http://homepage.univie.ac.at/erich.neuwirth/
+"""
+from turtle import Turtle, colormode, tracer, mainloop
+from random import randrange
+from time import clock
+
+def symRandom(n):
+    return randrange(-n,n+1)
+
+def randomize( branchlist, angledist, sizedist ):
+    return [ (angle+symRandom(angledist),
+              sizefactor*1.01**symRandom(sizedist))
+                     for angle, sizefactor in branchlist ]
+
+def randomfd( t, distance, parts, angledist ):
+    for i in range(parts):
+        t.left(symRandom(angledist))
+        t.forward( (1.0 * distance)/parts )
+
+def tree(tlist, size, level, widthfactor, branchlists, angledist=10, sizedist=5):
+    # benutzt Liste von turtles und Liste von Zweiglisten,
+    # fuer jede turtle eine!
+    if level > 0:
+        lst = []
+        brs = []
+        for t, branchlist in list(zip(tlist,branchlists)):
+            t.pensize( size * widthfactor )
+            t.pencolor( 255 - (180 - 11 * level + symRandom(15)),
+                        180 - 11 * level + symRandom(15),
+                        0 )
+            t.pendown()
+            randomfd(t, size, level, angledist )
+            yield 1
+            for angle, sizefactor in branchlist:
+                t.left(angle)
+                lst.append(t.clone())
+                brs.append(randomize(branchlist, angledist, sizedist))
+                t.right(angle)
+        for x in tree(lst, size*sizefactor, level-1, widthfactor, brs,
+                      angledist, sizedist):
+            yield None
+
+
+def start(t,x,y):
+    colormode(255)
+    t.reset()
+    t.speed(0)
+    t.hideturtle()
+    t.left(90)
+    t.penup()
+    t.setpos(x,y)
+    t.pendown()
+
+def doit1(level, pen):
+    pen.hideturtle()
+    start(pen, 20, -208)
+    t = tree( [pen], 80, level, 0.1, [[ (45,0.69), (0,0.65), (-45,0.71) ]] )
+    return t
+
+def doit2(level, pen):
+    pen.hideturtle()
+    start(pen, -135, -130)
+    t = tree( [pen], 120, level, 0.1, [[ (45,0.69), (-45,0.71) ]] )
+    return t
+
+def doit3(level, pen):
+    pen.hideturtle()
+    start(pen, 190, -90)
+    t = tree( [pen], 100, level, 0.1, [[ (45,0.7), (0,0.72), (-45,0.65) ]] )
+    return t
+
+# Hier 3 Baumgeneratoren:
+def main():
+    p = Turtle()
+    p.ht()
+    tracer(75,0)
+    u = doit1(6, Turtle(undobuffersize=1))
+    s = doit2(7, Turtle(undobuffersize=1))
+    t = doit3(5, Turtle(undobuffersize=1))
+    a = clock()
+    while True:
+        done = 0
+        for b in u,s,t:
+            try:
+                b.__next__()
+            except:
+                done += 1
+        if done == 3:
+            break
+
+    tracer(1,10)
+    b = clock()
+    return "runtime: %.2f sec." % (b-a)
+
+if __name__ == '__main__':
+    main()
+    mainloop()

third_party/python/Lib/turtledemo/fractalcurves.py

@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+"""      turtle-example-suite:
+
+        tdemo_fractalCurves.py
+
+This program draws two fractal-curve-designs:
+(1) A hilbert curve (in a box)
+(2) A combination of Koch-curves.
+
+The CurvesTurtle class and the fractal-curve-
+methods are taken from the PythonCard example
+scripts for turtle-graphics.
+"""
+from turtle import *
+from time import sleep, clock
+
+class CurvesTurtle(Pen):
+    # example derived from
+    # Turtle Geometry: The Computer as a Medium for Exploring Mathematics
+    # by Harold Abelson and Andrea diSessa
+    # p. 96-98
+    def hilbert(self, size, level, parity):
+        if level == 0:
+            return
+        # rotate and draw first subcurve with opposite parity to big curve
+        self.left(parity * 90)
+        self.hilbert(size, level - 1, -parity)
+        # interface to and draw second subcurve with same parity as big curve
+        self.forward(size)
+        self.right(parity * 90)
+        self.hilbert(size, level - 1, parity)
+        # third subcurve
+        self.forward(size)
+        self.hilbert(size, level - 1, parity)
+        # fourth subcurve
+        self.right(parity * 90)
+        self.forward(size)
+        self.hilbert(size, level - 1, -parity)
+        # a final turn is needed to make the turtle
+        # end up facing outward from the large square
+        self.left(parity * 90)
+
+    # Visual Modeling with Logo: A Structural Approach to Seeing
+    # by James Clayson
+    # Koch curve, after Helge von Koch who introduced this geometric figure in 1904
+    # p. 146
+    def fractalgon(self, n, rad, lev, dir):
+        import math
+
+        # if dir = 1 turn outward
+        # if dir = -1 turn inward
+        edge = 2 * rad * math.sin(math.pi / n)
+        self.pu()
+        self.fd(rad)
+        self.pd()
+        self.rt(180 - (90 * (n - 2) / n))
+        for i in range(n):
+            self.fractal(edge, lev, dir)
+            self.rt(360 / n)
+        self.lt(180 - (90 * (n - 2) / n))
+        self.pu()
+        self.bk(rad)
+        self.pd()
+
+    # p. 146
+    def fractal(self, dist, depth, dir):
+        if depth < 1:
+            self.fd(dist)
+            return
+        self.fractal(dist / 3, depth - 1, dir)
+        self.lt(60 * dir)
+        self.fractal(dist / 3, depth - 1, dir)
+        self.rt(120 * dir)
+        self.fractal(dist / 3, depth - 1, dir)
+        self.lt(60 * dir)
+        self.fractal(dist / 3, depth - 1, dir)
+
+def main():
+    ft = CurvesTurtle()
+
+    ft.reset()
+    ft.speed(0)
+    ft.ht()
+    ft.getscreen().tracer(1,0)
+    ft.pu()
+
+    size = 6
+    ft.setpos(-33*size, -32*size)
+    ft.pd()
+
+    ta=clock()
+    ft.fillcolor("red")
+    ft.begin_fill()
+    ft.fd(size)
+
+    ft.hilbert(size, 6, 1)
+
+    # frame
+    ft.fd(size)
+    for i in range(3):
+        ft.lt(90)
+        ft.fd(size*(64+i%2))
+    ft.pu()
+    for i in range(2):
+        ft.fd(size)
+        ft.rt(90)
+    ft.pd()
+    for i in range(4):
+        ft.fd(size*(66+i%2))
+        ft.rt(90)
+    ft.end_fill()
+    tb=clock()
+    res =  "Hilbert: %.2fsec. " % (tb-ta)
+
+    sleep(3)
+
+    ft.reset()
+    ft.speed(0)
+    ft.ht()
+    ft.getscreen().tracer(1,0)
+
+    ta=clock()
+    ft.color("black", "blue")
+    ft.begin_fill()
+    ft.fractalgon(3, 250, 4, 1)
+    ft.end_fill()
+    ft.begin_fill()
+    ft.color("red")
+    ft.fractalgon(3, 200, 4, -1)
+    ft.end_fill()
+    tb=clock()
+    res +=  "Koch: %.2fsec." % (tb-ta)
+    return res
+
+if __name__  == '__main__':
+    msg = main()
+    print(msg)
+    mainloop()

third_party/python/Lib/turtledemo/lindenmayer.py

@@ -0,0 +1,119 @@
+#!/usr/bin/env python3
+"""       turtle-example-suite:
+
+        xtx_lindenmayer_indian.py
+
+Each morning women in Tamil Nadu, in southern
+India, place designs, created by using rice
+flour and known as kolam on the thresholds of
+their homes.
+
+These can be described by Lindenmayer systems,
+which can easily be implemented with turtle
+graphics and Python.
+
+Two examples are shown here:
+(1) the snake kolam
+(2) anklets of Krishna
+
+Taken from Marcia Ascher: Mathematics
+Elsewhere, An Exploration of Ideas Across
+Cultures
+
+"""
+################################
+# Mini Lindenmayer tool
+###############################
+
+from turtle import *
+
+def replace( seq, replacementRules, n ):
+    for i in range(n):
+        newseq = ""
+        for element in seq:
+            newseq = newseq + replacementRules.get(element,element)
+        seq = newseq
+    return seq
+
+def draw( commands, rules ):
+    for b in commands:
+        try:
+            rules[b]()
+        except TypeError:
+            try:
+                draw(rules[b], rules)
+            except:
+                pass
+
+
+def main():
+    ################################
+    # Example 1: Snake kolam
+    ################################
+
+
+    def r():
+        right(45)
+
+    def l():
+        left(45)
+
+    def f():
+        forward(7.5)
+
+    snake_rules = {"-":r, "+":l, "f":f, "b":"f+f+f--f--f+f+f"}
+    snake_replacementRules = {"b": "b+f+b--f--b+f+b"}
+    snake_start = "b--f--b--f"
+
+    drawing = replace(snake_start, snake_replacementRules, 3)
+
+    reset()
+    speed(3)
+    tracer(1,0)
+    ht()
+    up()
+    backward(195)
+    down()
+    draw(drawing, snake_rules)
+
+    from time import sleep
+    sleep(3)
+
+    ################################
+    # Example 2: Anklets of Krishna
+    ################################
+
+    def A():
+        color("red")
+        circle(10,90)
+
+    def B():
+        from math import sqrt
+        color("black")
+        l = 5/sqrt(2)
+        forward(l)
+        circle(l, 270)
+        forward(l)
+
+    def F():
+        color("green")
+        forward(10)
+
+    krishna_rules = {"a":A, "b":B, "f":F}
+    krishna_replacementRules = {"a" : "afbfa", "b" : "afbfbfbfa" }
+    krishna_start = "fbfbfbfb"
+
+    reset()
+    speed(0)
+    tracer(3,0)
+    ht()
+    left(45)
+    drawing = replace(krishna_start, krishna_replacementRules, 3)
+    draw(drawing, krishna_rules)
+    tracer(1)
+    return "Done!"
+
+if __name__=='__main__':
+    msg = main()
+    print(msg)
+    mainloop()

third_party/python/Lib/turtledemo/minimal_hanoi.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python3
+"""       turtle-example-suite:
+
+         tdemo_minimal_hanoi.py
+
+A minimal 'Towers of Hanoi' animation:
+A tower of 6 discs is transferred from the
+left to the right peg.
+
+An imho quite elegant and concise
+implementation using a tower class, which
+is derived from the built-in type list.
+
+Discs are turtles with shape "square", but
+stretched to rectangles by shapesize()
+ ---------------------------------------
+       To exit press STOP button
+ ---------------------------------------
+"""
+from turtle import *
+
+class Disc(Turtle):
+    def __init__(self, n):
+        Turtle.__init__(self, shape="square", visible=False)
+        self.pu()
+        self.shapesize(1.5, n*1.5, 2) # square-->rectangle
+        self.fillcolor(n/6., 0, 1-n/6.)
+        self.st()
+
+class Tower(list):
+    "Hanoi tower, a subclass of built-in type list"
+    def __init__(self, x):
+        "create an empty tower. x is x-position of peg"
+        self.x = x
+    def push(self, d):
+        d.setx(self.x)
+        d.sety(-150+34*len(self))
+        self.append(d)
+    def pop(self):
+        d = list.pop(self)
+        d.sety(150)
+        return d
+
+def hanoi(n, from_, with_, to_):
+    if n > 0:
+        hanoi(n-1, from_, to_, with_)
+        to_.push(from_.pop())
+        hanoi(n-1, with_, from_, to_)
+
+def play():
+    onkey(None,"space")
+    clear()
+    try:
+        hanoi(6, t1, t2, t3)
+        write("press STOP button to exit",
+              align="center", font=("Courier", 16, "bold"))
+    except Terminator:
+        pass  # turtledemo user pressed STOP
+
+def main():
+    global t1, t2, t3
+    ht(); penup(); goto(0, -225)   # writer turtle
+    t1 = Tower(-250)
+    t2 = Tower(0)
+    t3 = Tower(250)
+    # make tower of 6 discs
+    for i in range(6,0,-1):
+        t1.push(Disc(i))
+    # prepare spartanic user interface ;-)
+    write("press spacebar to start game",
+          align="center", font=("Courier", 16, "bold"))
+    onkey(play, "space")
+    listen()
+    return "EVENTLOOP"
+
+if __name__=="__main__":
+    msg = main()
+    print(msg)
+    mainloop()

third_party/python/Lib/turtledemo/nim.py

@@ -0,0 +1,226 @@
+"""      turtle-example-suite:
+
+            tdemo_nim.py
+
+Play nim against the computer. The player
+who takes the last stick is the winner.
+
+Implements the model-view-controller
+design pattern.
+"""
+
+
+import turtle
+import random
+import time
+
+SCREENWIDTH = 640
+SCREENHEIGHT = 480
+
+MINSTICKS = 7
+MAXSTICKS = 31
+
+HUNIT = SCREENHEIGHT // 12
+WUNIT = SCREENWIDTH // ((MAXSTICKS // 5) * 11 + (MAXSTICKS % 5) * 2)
+
+SCOLOR = (63, 63, 31)
+HCOLOR = (255, 204, 204)
+COLOR = (204, 204, 255)
+
+def randomrow():
+    return random.randint(MINSTICKS, MAXSTICKS)
+
+def computerzug(state):
+    xored = state[0] ^ state[1] ^ state[2]
+    if xored == 0:
+        return randommove(state)
+    for z in range(3):
+        s = state[z] ^ xored
+        if s <= state[z]:
+            move = (z, s)
+            return move
+
+def randommove(state):
+    m = max(state)
+    while True:
+        z = random.randint(0,2)
+        if state[z] > (m > 1):
+            break
+    rand = random.randint(m > 1, state[z]-1)
+    return z, rand
+
+
+class NimModel(object):
+    def __init__(self, game):
+        self.game = game
+
+    def setup(self):
+        if self.game.state not in [Nim.CREATED, Nim.OVER]:
+            return
+        self.sticks = [randomrow(), randomrow(), randomrow()]
+        self.player = 0
+        self.winner = None
+        self.game.view.setup()
+        self.game.state = Nim.RUNNING
+
+    def move(self, row, col):
+        maxspalte = self.sticks[row]
+        self.sticks[row] = col
+        self.game.view.notify_move(row, col, maxspalte, self.player)
+        if self.game_over():
+            self.game.state = Nim.OVER
+            self.winner = self.player
+            self.game.view.notify_over()
+        elif self.player == 0:
+            self.player = 1
+            row, col = computerzug(self.sticks)
+            self.move(row, col)
+            self.player = 0
+
+    def game_over(self):
+        return self.sticks == [0, 0, 0]
+
+    def notify_move(self, row, col):
+        if self.sticks[row] <= col:
+            return
+        self.move(row, col)
+
+
+class Stick(turtle.Turtle):
+    def __init__(self, row, col, game):
+        turtle.Turtle.__init__(self, visible=False)
+        self.row = row
+        self.col = col
+        self.game = game
+        x, y = self.coords(row, col)
+        self.shape("square")
+        self.shapesize(HUNIT/10.0, WUNIT/20.0)
+        self.speed(0)
+        self.pu()
+        self.goto(x,y)
+        self.color("white")
+        self.showturtle()
+
+    def coords(self, row, col):
+        packet, remainder = divmod(col, 5)
+        x = (3 + 11 * packet + 2 * remainder) * WUNIT
+        y = (2 + 3 * row) * HUNIT
+        return x - SCREENWIDTH // 2 + WUNIT // 2, SCREENHEIGHT // 2 - y - HUNIT // 2
+
+    def makemove(self, x, y):
+        if self.game.state != Nim.RUNNING:
+            return
+        self.game.controller.notify_move(self.row, self.col)
+
+
+class NimView(object):
+    def __init__(self, game):
+        self.game = game
+        self.screen = game.screen
+        self.model = game.model
+        self.screen.colormode(255)
+        self.screen.tracer(False)
+        self.screen.bgcolor((240, 240, 255))
+        self.writer = turtle.Turtle(visible=False)
+        self.writer.pu()
+        self.writer.speed(0)
+        self.sticks = {}
+        for row in range(3):
+            for col in range(MAXSTICKS):
+                self.sticks[(row, col)] = Stick(row, col, game)
+        self.display("... a moment please ...")
+        self.screen.tracer(True)
+
+    def display(self, msg1, msg2=None):
+        self.screen.tracer(False)
+        self.writer.clear()
+        if msg2 is not None:
+            self.writer.goto(0, - SCREENHEIGHT // 2 + 48)
+            self.writer.pencolor("red")
+            self.writer.write(msg2, align="center", font=("Courier",18,"bold"))
+        self.writer.goto(0, - SCREENHEIGHT // 2 + 20)
+        self.writer.pencolor("black")
+        self.writer.write(msg1, align="center", font=("Courier",14,"bold"))
+        self.screen.tracer(True)
+
+    def setup(self):
+        self.screen.tracer(False)
+        for row in range(3):
+            for col in range(self.model.sticks[row]):
+                self.sticks[(row, col)].color(SCOLOR)
+        for row in range(3):
+            for col in range(self.model.sticks[row], MAXSTICKS):
+                self.sticks[(row, col)].color("white")
+        self.display("Your turn! Click leftmost stick to remove.")
+        self.screen.tracer(True)
+
+    def notify_move(self, row, col, maxspalte, player):
+        if player == 0:
+            farbe = HCOLOR
+            for s in range(col, maxspalte):
+                self.sticks[(row, s)].color(farbe)
+        else:
+            self.display(" ... thinking ...         ")
+            time.sleep(0.5)
+            self.display(" ... thinking ... aaah ...")
+            farbe = COLOR
+            for s in range(maxspalte-1, col-1, -1):
+                time.sleep(0.2)
+                self.sticks[(row, s)].color(farbe)
+            self.display("Your turn! Click leftmost stick to remove.")
+
+    def notify_over(self):
+        if self.game.model.winner == 0:
+            msg2 = "Congrats. You're the winner!!!"
+        else:
+            msg2 = "Sorry, the computer is the winner."
+        self.display("To play again press space bar. To leave press ESC.", msg2)
+
+    def clear(self):
+        if self.game.state == Nim.OVER:
+            self.screen.clear()
+
+
+class NimController(object):
+
+    def __init__(self, game):
+        self.game = game
+        self.sticks = game.view.sticks
+        self.BUSY = False
+        for stick in self.sticks.values():
+            stick.onclick(stick.makemove)
+        self.game.screen.onkey(self.game.model.setup, "space")
+        self.game.screen.onkey(self.game.view.clear, "Escape")
+        self.game.view.display("Press space bar to start game")
+        self.game.screen.listen()
+
+    def notify_move(self, row, col):
+        if self.BUSY:
+            return
+        self.BUSY = True
+        self.game.model.notify_move(row, col)
+        self.BUSY = False
+
+
+class Nim(object):
+    CREATED = 0
+    RUNNING = 1
+    OVER = 2
+    def __init__(self, screen):
+        self.state = Nim.CREATED
+        self.screen = screen
+        self.model = NimModel(self)
+        self.view = NimView(self)
+        self.controller = NimController(self)
+
+
+def main():
+    mainscreen = turtle.Screen()
+    mainscreen.mode("standard")
+    mainscreen.setup(SCREENWIDTH, SCREENHEIGHT)
+    nim = Nim(mainscreen)
+    return "EVENTLOOP"
+
+if __name__ == "__main__":
+    main()
+    turtle.mainloop()

third_party/python/Lib/turtledemo/paint.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+"""       turtle-example-suite:
+
+            tdemo_paint.py
+
+A simple  event-driven paint program
+
+- left mouse button moves turtle
+- middle mouse button changes color
+- right mouse button toogles betweem pen up
+(no line drawn when the turtle moves) and
+pen down (line is drawn). If pen up follows
+at least two pen-down moves, the polygon that
+includes the starting point is filled.
+ -------------------------------------------
+ Play around by clicking into the canvas
+ using all three mouse buttons.
+ -------------------------------------------
+          To exit press STOP button
+ -------------------------------------------
+"""
+from turtle import *
+
+def switchupdown(x=0, y=0):
+    if pen()["pendown"]:
+        end_fill()
+        up()
+    else:
+        down()
+        begin_fill()
+
+def changecolor(x=0, y=0):
+    global colors
+    colors = colors[1:]+colors[:1]
+    color(colors[0])
+
+def main():
+    global colors
+    shape("circle")
+    resizemode("user")
+    shapesize(.5)
+    width(3)
+    colors=["red", "green", "blue", "yellow"]
+    color(colors[0])
+    switchupdown()
+    onscreenclick(goto,1)
+    onscreenclick(changecolor,2)
+    onscreenclick(switchupdown,3)
+    return "EVENTLOOP"
+
+if __name__ == "__main__":
+    msg = main()
+    print(msg)
+    mainloop()

third_party/python/Lib/turtledemo/peace.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+"""       turtle-example-suite:
+
+              tdemo_peace.py
+
+A simple drawing suitable as a beginner's
+programming example. Aside from the
+peacecolors assignment and the for loop,
+it only uses turtle commands.
+"""
+
+from turtle import *
+
+def main():
+    peacecolors = ("red3",  "orange", "yellow",
+                   "seagreen4", "orchid4",
+                   "royalblue1", "dodgerblue4")
+
+    reset()
+    Screen()
+    up()
+    goto(-320,-195)
+    width(70)
+
+    for pcolor in peacecolors:
+        color(pcolor)
+        down()
+        forward(640)
+        up()
+        backward(640)
+        left(90)
+        forward(66)
+        right(90)
+
+    width(25)
+    color("white")
+    goto(0,-170)
+    down()
+
+    circle(170)
+    left(90)
+    forward(340)
+    up()
+    left(180)
+    forward(170)
+    right(45)
+    down()
+    forward(170)
+    up()
+    backward(170)
+    left(90)
+    down()
+    forward(170)
+    up()
+
+    goto(0,300) # vanish if hideturtle() is not available ;-)
+    return "Done!"
+
+if __name__ == "__main__":
+    main()
+    mainloop()

third_party/python/Lib/turtledemo/penrose.py

@@ -0,0 +1,178 @@
+#!/usr/bin/env python3
+"""       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 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 = {}
+    a = clock()
+    tracer(0)
+    fun(l, n)
+    b = clock()
+    draw(l, n, th)
+    tracer(1)
+    c = clock()
+    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()

third_party/python/Lib/turtledemo/planet_and_moon.py

@@ -0,0 +1,111 @@
+#!/usr/bin/env python3
+"""       turtle-example-suite:
+
+        tdemo_planets_and_moon.py
+
+Gravitational system simulation using the
+approximation method from Feynman-lectures,
+p.9-8, using turtlegraphics.
+
+Example: heavy central body, light planet,
+very light moon!
+Planet has a circular orbit, moon a stable
+orbit around the planet.
+
+You can hold the movement temporarily by
+pressing the left mouse button with the
+mouse over the scrollbar of the canvas.
+
+"""
+from turtle import Shape, Turtle, mainloop, Vec2D as Vec
+
+G = 8
+
+class GravSys(object):
+    def __init__(self):
+        self.planets = []
+        self.t = 0
+        self.dt = 0.01
+    def init(self):
+        for p in self.planets:
+            p.init()
+    def start(self):
+        for i in range(10000):
+            self.t += self.dt
+            for p in self.planets:
+                p.step()
+
+class Star(Turtle):
+    def __init__(self, m, x, v, gravSys, shape):
+        Turtle.__init__(self, shape=shape)
+        self.penup()
+        self.m = m
+        self.setpos(x)
+        self.v = v
+        gravSys.planets.append(self)
+        self.gravSys = gravSys
+        self.resizemode("user")
+        self.pendown()
+    def init(self):
+        dt = self.gravSys.dt
+        self.a = self.acc()
+        self.v = self.v + 0.5*dt*self.a
+    def acc(self):
+        a = Vec(0,0)
+        for planet in self.gravSys.planets:
+            if planet != self:
+                v = planet.pos()-self.pos()
+                a += (G*planet.m/abs(v)**3)*v
+        return a
+    def step(self):
+        dt = self.gravSys.dt
+        self.setpos(self.pos() + dt*self.v)
+        if self.gravSys.planets.index(self) != 0:
+            self.setheading(self.towards(self.gravSys.planets[0]))
+        self.a = self.acc()
+        self.v = self.v + dt*self.a
+
+## create compound yellow/blue turtleshape for planets
+
+def main():
+    s = Turtle()
+    s.reset()
+    s.getscreen().tracer(0,0)
+    s.ht()
+    s.pu()
+    s.fd(6)
+    s.lt(90)
+    s.begin_poly()
+    s.circle(6, 180)
+    s.end_poly()
+    m1 = s.get_poly()
+    s.begin_poly()
+    s.circle(6,180)
+    s.end_poly()
+    m2 = s.get_poly()
+
+    planetshape = Shape("compound")
+    planetshape.addcomponent(m1,"orange")
+    planetshape.addcomponent(m2,"blue")
+    s.getscreen().register_shape("planet", planetshape)
+    s.getscreen().tracer(1,0)
+
+    ## setup gravitational system
+    gs = GravSys()
+    sun = Star(1000000, Vec(0,0), Vec(0,-2.5), gs, "circle")
+    sun.color("yellow")
+    sun.shapesize(1.8)
+    sun.pu()
+    earth = Star(12500, Vec(210,0), Vec(0,195), gs, "planet")
+    earth.pencolor("green")
+    earth.shapesize(0.8)
+    moon = Star(1, Vec(220,0), Vec(0,295), gs, "planet")
+    moon.pencolor("blue")
+    moon.shapesize(0.5)
+    gs.init()
+    gs.start()
+    return "Done!"
+
+if __name__ == '__main__':
+    main()
+    mainloop()

third_party/python/Lib/turtledemo/rosette.py

@@ -0,0 +1,65 @@
+"""      turtle-example-suite:
+
+          tdemo_wikipedia3.py
+
+This example is
+inspired by the Wikipedia article on turtle
+graphics. (See example wikipedia1 for URLs)
+
+First we create (ne-1) (i.e. 35 in this
+example) copies of our first turtle p.
+Then we let them perform their steps in
+parallel.
+
+Followed by a complete undo().
+"""
+from turtle import Screen, Turtle, mainloop
+from time import clock, sleep
+
+def mn_eck(p, ne,sz):
+    turtlelist = [p]
+    #create ne-1 additional turtles
+    for i in range(1,ne):
+        q = p.clone()
+        q.rt(360.0/ne)
+        turtlelist.append(q)
+        p = q
+    for i in range(ne):
+        c = abs(ne/2.0-i)/(ne*.7)
+        # let those ne turtles make a step
+        # in parallel:
+        for t in turtlelist:
+            t.rt(360./ne)
+            t.pencolor(1-c,0,c)
+            t.fd(sz)
+
+def main():
+    s = Screen()
+    s.bgcolor("black")
+    p=Turtle()
+    p.speed(0)
+    p.hideturtle()
+    p.pencolor("red")
+    p.pensize(3)
+
+    s.tracer(36,0)
+
+    at = clock()
+    mn_eck(p, 36, 19)
+    et = clock()
+    z1 = et-at
+
+    sleep(1)
+
+    at = clock()
+    while any([t.undobufferentries() for t in s.turtles()]):
+        for t in s.turtles():
+            t.undo()
+    et = clock()
+    return "runtime: %.3f sec" % (z1+et-at)
+
+
+if __name__ == '__main__':
+    msg = main()
+    print(msg)
+    mainloop()

third_party/python/Lib/turtledemo/round_dance.py

@@ -0,0 +1,86 @@
+"""      turtle-example-suite:
+
+         tdemo_round_dance.py
+
+(Needs version 1.1 of the turtle module that
+comes with Python 3.1)
+
+Dancing turtles have a compound shape
+consisting of a series of triangles of
+decreasing size.
+
+Turtles march along a circle while rotating
+pairwise in opposite direction, with one
+exception. Does that breaking of symmetry
+enhance the attractiveness of the example?
+
+Press any key to stop the animation.
+
+Technically: demonstrates use of compound
+shapes, transformation of shapes as well as
+cloning turtles. The animation is
+controlled through update().
+"""
+
+from turtle import *
+
+def stop():
+    global running
+    running = False
+
+def main():
+    global running
+    clearscreen()
+    bgcolor("gray10")
+    tracer(False)
+    shape("triangle")
+    f =   0.793402
+    phi = 9.064678
+    s = 5
+    c = 1
+    # create compound shape
+    sh = Shape("compound")
+    for i in range(10):
+        shapesize(s)
+        p =get_shapepoly()
+        s *= f
+        c *= f
+        tilt(-phi)
+        sh.addcomponent(p, (c, 0.25, 1-c), "black")
+    register_shape("multitri", sh)
+    # create dancers
+    shapesize(1)
+    shape("multitri")
+    pu()
+    setpos(0, -200)
+    dancers = []
+    for i in range(180):
+        fd(7)
+        tilt(-4)
+        lt(2)
+        update()
+        if i % 12 == 0:
+            dancers.append(clone())
+    home()
+    # dance
+    running = True
+    onkeypress(stop)
+    listen()
+    cs = 1
+    while running:
+        ta = -4
+        for dancer in dancers:
+            dancer.fd(7)
+            dancer.lt(2)
+            dancer.tilt(ta)
+            ta = -4 if ta > 0 else 2
+        if cs < 180:
+            right(4)
+            shapesize(cs)
+            cs *= 1.005
+        update()
+    return "DONE!"
+
+if __name__=='__main__':
+    print(main())
+    mainloop()

third_party/python/Lib/turtledemo/sorting_animate.py

@@ -0,0 +1,204 @@
+#!/usr/bin/env python3
+"""
+
+         sorting_animation.py
+
+A minimal sorting algorithm animation:
+Sorts a shelf of 10 blocks using insertion
+sort, selection sort and quicksort.
+
+Shelfs are implemented using builtin lists.
+
+Blocks are turtles with shape "square", but
+stretched to rectangles by shapesize()
+ ---------------------------------------
+       To exit press space button
+ ---------------------------------------
+"""
+from turtle import *
+import random
+
+
+class Block(Turtle):
+
+    def __init__(self, size):
+        self.size = size
+        Turtle.__init__(self, shape="square", visible=False)
+        self.pu()
+        self.shapesize(size * 1.5, 1.5, 2) # square-->rectangle
+        self.fillcolor("black")
+        self.st()
+
+    def glow(self):
+        self.fillcolor("red")
+
+    def unglow(self):
+        self.fillcolor("black")
+
+    def __repr__(self):
+        return "Block size: {0}".format(self.size)
+
+
+class Shelf(list):
+
+    def __init__(self, y):
+        "create a shelf. y is y-position of first block"
+        self.y = y
+        self.x = -150
+
+    def push(self, d):
+        width, _, _ = d.shapesize()
+        # align blocks by the bottom edge
+        y_offset = width / 2 * 20
+        d.sety(self.y + y_offset)
+        d.setx(self.x + 34 * len(self))
+        self.append(d)
+
+    def _close_gap_from_i(self, i):
+        for b in self[i:]:
+            xpos, _ = b.pos()
+            b.setx(xpos - 34)
+
+    def _open_gap_from_i(self, i):
+        for b in self[i:]:
+            xpos, _ = b.pos()
+            b.setx(xpos + 34)
+
+    def pop(self, key):
+        b = list.pop(self, key)
+        b.glow()
+        b.sety(200)
+        self._close_gap_from_i(key)
+        return b
+
+    def insert(self, key, b):
+        self._open_gap_from_i(key)
+        list.insert(self, key, b)
+        b.setx(self.x + 34 * key)
+        width, _, _ = b.shapesize()
+        # align blocks by the bottom edge
+        y_offset = width / 2 * 20
+        b.sety(self.y + y_offset)
+        b.unglow()
+
+def isort(shelf):
+    length = len(shelf)
+    for i in range(1, length):
+        hole = i
+        while hole > 0 and shelf[i].size < shelf[hole - 1].size:
+            hole = hole - 1
+        shelf.insert(hole, shelf.pop(i))
+    return
+
+def ssort(shelf):
+    length = len(shelf)
+    for j in range(0, length - 1):
+        imin = j
+        for i in range(j + 1, length):
+            if shelf[i].size < shelf[imin].size:
+                imin = i
+        if imin != j:
+            shelf.insert(j, shelf.pop(imin))
+
+def partition(shelf, left, right, pivot_index):
+    pivot = shelf[pivot_index]
+    shelf.insert(right, shelf.pop(pivot_index))
+    store_index = left
+    for i in range(left, right): # range is non-inclusive of ending value
+        if shelf[i].size < pivot.size:
+            shelf.insert(store_index, shelf.pop(i))
+            store_index = store_index + 1
+    shelf.insert(store_index, shelf.pop(right)) # move pivot to correct position
+    return store_index
+
+def qsort(shelf, left, right):
+    if left < right:
+        pivot_index = left
+        pivot_new_index = partition(shelf, left, right, pivot_index)
+        qsort(shelf, left, pivot_new_index - 1)
+        qsort(shelf, pivot_new_index + 1, right)
+
+def randomize():
+    disable_keys()
+    clear()
+    target = list(range(10))
+    random.shuffle(target)
+    for i, t in enumerate(target):
+        for j in range(i, len(s)):
+            if s[j].size == t + 1:
+                s.insert(i, s.pop(j))
+    show_text(instructions1)
+    show_text(instructions2, line=1)
+    enable_keys()
+
+def show_text(text, line=0):
+    line = 20 * line
+    goto(0,-250 - line)
+    write(text, align="center", font=("Courier", 16, "bold"))
+
+def start_ssort():
+    disable_keys()
+    clear()
+    show_text("Selection Sort")
+    ssort(s)
+    clear()
+    show_text(instructions1)
+    show_text(instructions2, line=1)
+    enable_keys()
+
+def start_isort():
+    disable_keys()
+    clear()
+    show_text("Insertion Sort")
+    isort(s)
+    clear()
+    show_text(instructions1)
+    show_text(instructions2, line=1)
+    enable_keys()
+
+def start_qsort():
+    disable_keys()
+    clear()
+    show_text("Quicksort")
+    qsort(s, 0, len(s) - 1)
+    clear()
+    show_text(instructions1)
+    show_text(instructions2, line=1)
+    enable_keys()
+
+def init_shelf():
+    global s
+    s = Shelf(-200)
+    vals = (4, 2, 8, 9, 1, 5, 10, 3, 7, 6)
+    for i in vals:
+        s.push(Block(i))
+
+def disable_keys():
+    onkey(None, "s")
+    onkey(None, "i")
+    onkey(None, "q")
+    onkey(None, "r")
+
+def enable_keys():
+    onkey(start_isort, "i")
+    onkey(start_ssort, "s")
+    onkey(start_qsort, "q")
+    onkey(randomize, "r")
+    onkey(bye, "space")
+
+def main():
+    getscreen().clearscreen()
+    ht(); penup()
+    init_shelf()
+    show_text(instructions1)
+    show_text(instructions2, line=1)
+    enable_keys()
+    listen()
+    return "EVENTLOOP"
+
+instructions1 = "press i for insertion sort, s for selection sort, q for quicksort"
+instructions2 = "spacebar to quit, r to randomize"
+
+if __name__=="__main__":
+    msg = main()
+    mainloop()

third_party/python/Lib/turtledemo/tree.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+"""      turtle-example-suite:
+
+             tdemo_tree.py
+
+Displays a 'breadth-first-tree' - in contrast
+to the classical Logo tree drawing programs,
+which use a depth-first-algorithm.
+
+Uses:
+(1) a tree-generator, where the drawing is
+quasi the side-effect, whereas the generator
+always yields None.
+(2) Turtle-cloning: At each branching point
+the current pen is cloned. So in the end
+there are 1024 turtles.
+"""
+from turtle import Turtle, mainloop
+from time import clock
+
+def tree(plist, l, a, f):
+    """ plist is list of pens
+    l is length of branch
+    a is half of the angle between 2 branches
+    f is factor by which branch is shortened
+    from level to level."""
+    if l > 3:
+        lst = []
+        for p in plist:
+            p.forward(l)
+            q = p.clone()
+            p.left(a)
+            q.right(a)
+            lst.append(p)
+            lst.append(q)
+        for x in tree(lst, l*f, a, f):
+            yield None
+
+def maketree():
+    p = Turtle()
+    p.setundobuffer(None)
+    p.hideturtle()
+    p.speed(0)
+    p.getscreen().tracer(30,0)
+    p.left(90)
+    p.penup()
+    p.forward(-210)
+    p.pendown()
+    t = tree([p], 200, 65, 0.6375)
+    for x in t:
+        pass
+
+def main():
+    a=clock()
+    maketree()
+    b=clock()
+    return "done: %.2f sec." % (b-a)
+
+if __name__ == "__main__":
+    msg = main()
+    print(msg)
+    mainloop()

third_party/python/Lib/turtledemo/turtle.cfg

@@ -0,0 +1,10 @@
+width = 800
+height = 600
+canvwidth = 1200
+canvheight = 900
+shape = arrow
+mode = standard
+resizemode = auto
+fillcolor = ""
+title = Python turtle graphics demo.
+

third_party/python/Lib/turtledemo/two_canvases.py

@@ -0,0 +1,54 @@
+"""turtledemo.two_canvases
+
+Use TurtleScreen and RawTurtle to draw on two
+distinct canvases in a separate windows. The
+new window must be separately closed in
+addition to pressing the STOP button.
+"""
+
+from turtle import TurtleScreen, RawTurtle, TK
+
+def main():
+    root = TK.Tk()
+    cv1 = TK.Canvas(root, width=300, height=200, bg="#ddffff")
+    cv2 = TK.Canvas(root, width=300, height=200, bg="#ffeeee")
+    cv1.pack()
+    cv2.pack()
+
+    s1 = TurtleScreen(cv1)
+    s1.bgcolor(0.85, 0.85, 1)
+    s2 = TurtleScreen(cv2)
+    s2.bgcolor(1, 0.85, 0.85)
+
+    p = RawTurtle(s1)
+    q = RawTurtle(s2)
+
+    p.color("red", (1, 0.85, 0.85))
+    p.width(3)
+    q.color("blue", (0.85, 0.85, 1))
+    q.width(3)
+
+    for t in p,q:
+        t.shape("turtle")
+        t.lt(36)
+
+    q.lt(180)
+
+    for t in p, q:
+        t.begin_fill()
+    for i in range(5):
+        for t in p, q:
+            t.fd(50)
+            t.lt(72)
+    for t in p,q:
+        t.end_fill()
+        t.lt(54)
+        t.pu()
+        t.bk(50)
+
+    return "EVENTLOOP"
+
+
+if __name__ == '__main__':
+    main()
+    TK.mainloop()  # keep window open until user closes it

third_party/python/Lib/turtledemo/yinyang.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+"""       turtle-example-suite:
+
+            tdemo_yinyang.py
+
+Another drawing suitable as a beginner's
+programming example.
+
+The small circles are drawn by the circle
+command.
+
+"""
+
+from turtle import *
+
+def yin(radius, color1, color2):
+    width(3)
+    color("black", color1)
+    begin_fill()
+    circle(radius/2., 180)
+    circle(radius, 180)
+    left(180)
+    circle(-radius/2., 180)
+    end_fill()
+    left(90)
+    up()
+    forward(radius*0.35)
+    right(90)
+    down()
+    color(color1, color2)
+    begin_fill()
+    circle(radius*0.15)
+    end_fill()
+    left(90)
+    up()
+    backward(radius*0.35)
+    down()
+    left(90)
+
+def main():
+    reset()
+    yin(200, "black", "white")
+    yin(200, "white", "black")
+    ht()
+    return "Done!"
+
+if __name__ == '__main__':
+    main()
+    mainloop()