python绘制简单彩虹图
本文实例为大家分享了python绘制彩虹图的具体代码，供大家参考，具体内容如下
代码：
from turtle import *
#控制彩虹路径
def path(pen, r, g, b):
pen.penup()
pen.goto(-400, -300)
pen.pendown()
pen.pencolor(r, g, b)
pen.circle(1000, -180)
pen.pensize(2)
pen.right(0.05)
#绘制彩虹控制颜色
def Rainbow():
pen = Turtle()
pen.right(110)
r = 255
g = 0
b = 0
interval = 5
colormode(255)
# 由红到黄
while g < 256:
path(pen, r, g, b)
g = g + interval
#由黄到绿
g = 255
while r > 0:
r = r - interval
path(pen, r, g, b)
#由绿到青
r = 0
while (b < 255 ):
b = b + interval
path(pen, r, g, b)
b = 255
#由青到蓝
while (g > 0):
g = g - interval
path(pen, r, g, b)
#由蓝到紫到红
g = 0
while r < 255:
r = r + interval
path(pen, r, g, b)
#文字输出
def TextFun():
text = Turtle()
text.hideturtle()
text.color("red")
text.penup()
text.setpos(100, -100)
text.pendown()
text.write("Rainbow", False, align="center", font=("Script MT Bold", 80, "bold"))
def main():
setup(800, 600, 0, 0)
title("rainbow")
tracer(False)
Rainbow()
TextFun()
tracer(True)
mainloop()
if __name__ == '__main__':
main()
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