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      1 #!/usr/bin/env python
      2 """      turtle-example-suite:
      3 
      4         tdemo_bytedesign.py
      5 
      6 An example adapted from the example-suite
      7 of PythonCard's turtle graphcis.
      8 
      9 It's based on an article in BYTE magazine
     10 Problem Solving with Logo: Using Turtle
     11 Graphics to Redraw a Design
     12 November 1982, p. 118 - 134
     13 
     14 -------------------------------------------
     15 
     16 Due to the statement
     17 
     18 t.delay(0)
     19 
     20 in line 152, which sets the animation delay
     21 to 0, this animation runs in "line per line"
     22 mode as fast as possible.
     23 """
     24 
     25 import math
     26 from turtle import Turtle, mainloop
     27 from time import clock
     28 
     29 # wrapper for any additional drawing routines
     30 # that need to know about each other
     31 class Designer(Turtle):
     32 
     33     def design(self, homePos, scale):
     34         self.up()
     35         for i in range(5):
     36             self.forward(64.65 * scale)
     37             self.down()
     38             self.wheel(self.position(), scale)
     39             self.up()
     40             self.backward(64.65 * scale)
     41             self.right(72)
     42         self.up()
     43         self.goto(homePos)
     44         self.right(36)
     45         self.forward(24.5 * scale)
     46         self.right(198)
     47         self.down()
     48         self.centerpiece(46 * scale, 143.4, scale)
     49         self.tracer(True)
     50 
     51     def wheel(self, initpos, scale):
     52         self.right(54)
     53         for i in range(4):
     54             self.pentpiece(initpos, scale)
     55         self.down()
     56         self.left(36)
     57         for i in range(5):
     58             self.tripiece(initpos, scale)
     59         self.left(36)
     60         for i in range(5):
     61             self.down()
     62             self.right(72)
     63             self.forward(28 * scale)
     64             self.up()
     65             self.backward(28 * scale)
     66         self.left(54)
     67         self.getscreen().update()
     68 
     69     def tripiece(self, initpos, scale):
     70         oldh = self.heading()
     71         self.down()
     72         self.backward(2.5 * scale)
     73         self.tripolyr(31.5 * scale, scale)
     74         self.up()
     75         self.goto(initpos)
     76         self.setheading(oldh)
     77         self.down()
     78         self.backward(2.5 * scale)
     79         self.tripolyl(31.5 * scale, scale)
     80         self.up()
     81         self.goto(initpos)
     82         self.setheading(oldh)
     83         self.left(72)
     84         self.getscreen().update()
     85 
     86     def pentpiece(self, initpos, scale):
     87         oldh = self.heading()
     88         self.up()
     89         self.forward(29 * scale)
     90         self.down()
     91         for i in range(5):
     92             self.forward(18 * scale)
     93             self.right(72)
     94         self.pentr(18 * scale, 75, scale)
     95         self.up()
     96         self.goto(initpos)
     97         self.setheading(oldh)
     98         self.forward(29 * scale)
     99         self.down()
    100         for i in range(5):
    101             self.forward(18 * scale)
    102             self.right(72)
    103         self.pentl(18 * scale, 75, scale)
    104         self.up()
    105         self.goto(initpos)
    106         self.setheading(oldh)
    107         self.left(72)
    108         self.getscreen().update()
    109 
    110     def pentl(self, side, ang, scale):
    111         if side < (2 * scale): return
    112         self.forward(side)
    113         self.left(ang)
    114         self.pentl(side - (.38 * scale), ang, scale)
    115 
    116     def pentr(self, side, ang, scale):
    117         if side < (2 * scale): return
    118         self.forward(side)
    119         self.right(ang)
    120         self.pentr(side - (.38 * scale), ang, scale)
    121 
    122     def tripolyr(self, side, scale):
    123         if side < (4 * scale): return
    124         self.forward(side)
    125         self.right(111)
    126         self.forward(side / 1.78)
    127         self.right(111)
    128         self.forward(side / 1.3)
    129         self.right(146)
    130         self.tripolyr(side * .75, scale)
    131 
    132     def tripolyl(self, side, scale):
    133         if side < (4 * scale): return
    134         self.forward(side)
    135         self.left(111)
    136         self.forward(side / 1.78)
    137         self.left(111)
    138         self.forward(side / 1.3)
    139         self.left(146)
    140         self.tripolyl(side * .75, scale)
    141 
    142     def centerpiece(self, s, a, scale):
    143         self.forward(s); self.left(a)
    144         if s < (7.5 * scale):
    145             return
    146         self.centerpiece(s - (1.2 * scale), a, scale)
    147 
    148 def main():
    149     t = Designer()
    150     t.speed(0)
    151     t.hideturtle()
    152     t.getscreen().delay(0)
    153     t.tracer(0)
    154     at = clock()
    155     t.design(t.position(), 2)
    156     et = clock()
    157     return "runtime: %.2f sec." % (et-at)
    158 
    159 if __name__ == '__main__':
    160     msg = main()
    161     print msg
    162     mainloop()
    163