TurtleWorld

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1、画线

       1 #!/usr/bin/python       2 from swampy.TurtleWorld import *       3        4 world = TurtleWorld()       5 bob = Turtle()       6 print bob       7        8 for i in range(4):       9     fd(bob,100)      10     lt(bob)      11       12 for i in range(4):      13     print('Hello')      14       15 wait_for_user()

输出：

       1 #!/usr/bin/python       2 from swampy.TurtleWorld import *       3        4 world = TurtleWorld()       5 bob = Turtle()       6 print bob       7        8 def draw_square(Tt,length):       9     fd(Tt,length)      10     lt(Tt)      11       12 for i in range(4):      13     draw_square(bob,100)

       1 #!/usr/bin/python       2 from swampy.TurtleWorld import *       3        4 world = TurtleWorld()       5 bob = Turtle()       6 print bob       7 # the functions lt and rt make 90-degree turns by default.       8 # lt(bob,45) turns bob 45 degrees to the left       9 def draw_eight_sides(Tt,length):      10     fd(Tt,length)      11     lt(Tt,45)      12       13 for i in range(8):      14     draw_eight_sides(bob,60)

       1 #!/usr/bin/python       2 from swampy.TurtleWorld import *       3        4 world = TurtleWorld()       5 bob = Turtle()       6 print bob       7 # the functions lt and rt make 90-degree turns by default.       8 # lt(bob,45) turns bob 45 degrees to the left       9 def draw_polygon(Tt,length,n):      10     fd(Tt,length)      11     lt(Tt,360/n)      12       13 for i in range(6):      14     draw_polygon(bob,60,6)

       1 #!/usr/bin/python       2 from swampy.TurtleWorld import *       3        4 world = TurtleWorld()       5 bob = Turtle()       6 print bob       7 # the functions lt and rt make 90-degree turns by default.       8 # lt(bob,45) turns bob 45 degrees to the left       9 def draw_polygon(Tt,length,n):      10     angle = 360/n      11     for i in range(n):      12         fd(Tt,length)      13         lt(Tt,angle)      14       15 draw_polygon(bob,60,6)

       1 #!/usr/bin/python       2 from swampy.TurtleWorld import *       3 import math       4 world = TurtleWorld()       5 bob = Turtle()       6 print bob       7 # the functions lt and rt make 90-degree turns by default.       8 # lt(bob,45) turns bob 45 degrees to the left       9 def polygon(t,length,n):      10     angle = 360/n      11     for i in range(n):      12         fd(t,length)      13         lt(t,angle)      14 def draw_circle(Tt,r):      15     circumference = 2 * math.pi * r      16     n = 100      17     length = circumference/n      18     polygon(Tt,length,n)      19       20 draw_circle(bob,50)

输出：

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