python海龟绘图源码练习

# import package and making objects import turtle sc=turtle.Screen() trtl=turtle.Turtle() # method to draw y-axis lines def drawy(val) # line trtl.forward(300) # set position trtl.up() trtl.setpos(val,300) trtl.down() # another line trtl.backward(300) # set position again trtl.up() trtl.setpos(val+10,0) trtl.down() # method to draw y-axis lines def drawx(val) # line trtl.forward(300) # set position trtl.up() trtl.setpos(300,val) trtl.down() # another line trtl.backward(300) # set position again trtl.up() trtl.setpos(0,val+10) trtl.down() # method to label the graph grid def lab() # set position trtl.penup() trtl.setpos(155,155) trtl.pendown() # write 0 trtl.write(0,font=(Verdana, 12, bold)) # set position again trtl.penup() trtl.setpos(290,155) trtl.pendown() # write x trtl.write(x,font=(Verdana, 12, bold)) # set position again trtl.penup() trtl.setpos(155,290) trtl.pendown() # write y trtl.write(y,font=(Verdana, 12, bold)) # Main Section # set screen sc.setup(800,800) # set turtle features trtl.speed(100) trtl.left(90) trtl.color('lightgreen') # y lines for i in range(30) drawy(10(i+1)) # set position for x lines trtl.right(90) trtl.up() trtl.setpos(0,0) trtl.down() # x lines for i in range(30) drawx(10(i+1)) # axis trtl.color('green') # set position for x axis trtl.up() trtl.setpos(0,150) trtl.down() # x-axis trtl.forward(300) # set position for y axis trtl.left(90) trtl.up() trtl.setpos(150,0) trtl.down() # y-axis trtl.forward(300) # labeling lab() # hide the turtle trtl.hideturtle()