操縱海龜繪圖有着許多的命令,這些命令可以划分為兩種:一種為運動命令，一種為畫筆控制命令
1. 運動命令:
forward(degree) #向前移動距離degree代表距離
backward(degree) #向后移動距離degree代表距離
right(degree) #向右移動多少度
left(degree) #向左移動多少度
goto(x,y) #將畫筆移動到坐標為x,y的位置
stamp() #復制當前圖形
speed(speed) #畫筆繪制的速度范圍[0,10]整數
2. 畫筆控制命令:
down() #移動時繪制圖形,缺省時也為繪制
up() #移動時不繪制圖形
pensize(width) #繪制圖形時的寬度
color(colorstring) #繪制圖形時的顏色
fillcolor(colorstring) #繪制圖形的填充顏色
fill(Ture)
fill(false)
lucy : 夢想照進現實；露茜；青春風采；
draw_flower1.py
import turtle
import math
def p_line(t, n, length, angle):
"""Draws n line segments."""
for i in range(n):
t.fd(length)
t.lt(angle)
def polygon(t, n, length):
"""Draws a polygon with n sides."""
angle = 360/n
p_line(t, n, length, angle)
def arc(t, r, angle):
"""Draws an arc with the given radius and angle."""
arc_length = 2 * math.pi * r * abs(angle) / 360
n = int(arc_length / 4) + 1
step_length = arc_length / n
step_angle = float(angle) / n
# Before starting reduces, making a slight left turn.
t.lt(step_angle/2)
p_line(t, n, step_length, step_angle)
t.rt(step_angle/2)
def petal(t, r, angle):
"""Draws a 花瓣 using two arcs."""
for i in range(2):
arc(t, r, angle)
t.lt(180-angle)
def flower(t, n, r, angle, p):
"""Draws a flower with n petals."""
for i in range(n):
petal(t, r, angle)
t.lt(p/n)
def leaf(t, r, angle, p):
"""Draws a 葉子 and fill it."""
t.begin_fill() # Begin the fill process.
t.down()
flower(t, 1, 40, 80, 180)
t.end_fill()
def main():
window=turtle.Screen() #creat a screen
window.bgcolor("blue")
lucy=turtle.Turtle()
lucy.shape("turtle")
lucy.color("red")
lucy.width(5)
lucy.speed(0)
# Drawing flower
flower(lucy, 10, 40, 100, 360)
# Drawing pedicel
lucy.color("brown")
lucy.rt(90)
lucy.fd(200)
# Drawing leaf
lucy.rt(270)
lucy.color("green")
leaf(lucy, 40, 80, 180)
lucy.ht()
window.exitonclick()
main()
執行結果：
