条件、循环、函数定义 练习(2017.9.12)
2.对前面的代码进行优化,用for,while,if,def实现:
(1).画五角星
import turtle
for i in range(5):
turtle.forward(100)
turtle.right(144)
如图所示:
(2).画同心圆
import turtle
for i in range(5):
turtle.up()
turtle.goto(0,-20*(i+1))
turtle.down()
turtle.circle(20*(i+1))
如图所示:
(3).画太阳花
import turtle
turtle.color('yellow','red')
turtle.begin_fill()
while True:
turtle.forward(200)
turtle.left(150)
if (abs(turtle.pos()))<1:
break
turtle.end_fill()
done()
如图所示:
(4).画五个角星
import turtle
turtle.setup(600,400,0,0)
turtle.bgcolor('red')
turtle.color('yellow')
turtle.fillcolor('yellow')
def mygoto(x,y):
turtle.up()
turtle.goto(x,y)
turtle.down()
mygoto(-250,75)
turtle.begin_fill()
for i in range(5):
turtle.forward(120)
turtle.right(144)
turtle.end_fill()
mygoto(-70,120)
turtle.begin_fill()
for i in range(5):
turtle.forward(-30)
turtle.right(144)
turtle.end_fill()
mygoto(-30,80)
turtle.begin_fill()
for i in range(5):
turtle.forward(-30)
turtle.right(144)
turtle.end_fill()
mygoto(-35,30)
turtle.begin_fill()
for i in range(5):
turtle.forward(-30)
turtle.left(144)
turtle.end_fill()
mygoto(-70,-25)
turtle.begin_fill()
for i in range(5):
turtle.forward(-30)
turtle.right(144)
turtle.end_fill()
如图所示: