Python利用turtle库绘制彩虹代码示例_Python

语言：Python
IDE：Python.IDE

需求

做出彩虹效果

颜色空间

RGB模型：光的三原色，共同决定色相
HSB/HSV模型：H色彩，S深浅，B饱和度，H决定色相
需要将HSB模型转换为RGB模型

代码示例：

									#-*- coding:utf-8 –*-

									from turtle import *

									def HSB2RGB(hues):

									 hues = hues * 3.59 #100转成359范围

									 rgb=[0.0,0.0,0.0]

									 i = int(hues/60)%6

									 f = hues/60 -i

									 if i == 0:

									  rgb[0] = 1; rgb[1] = f; rgb[2] = 0

									 elif i == 1:

									  rgb[0] = 1-f; rgb[1] = 1; rgb[2] = 0

									 elif i == 2:

									  rgb[0] = 0; rgb[1] = 1; rgb[2] = f

									 elif i == 3:

									  rgb[0] = 0; rgb[1] = 1-f; rgb[2] = 1

									 elif i == 4:

									  rgb[0] = f; rgb[1] = 0; rgb[2] = 1

									 elif i == 5:

									  rgb[0] = 1; rgb[1] = 0; rgb[2] = 1-f

									 return rgb

									def rainbow():

									 hues = 0.0

									 color(1,0,0)

									 #绘制彩虹

									 hideturtle()

									 speed(100)

									 pensize(3)

									 penup()

									 goto(-400,-300)

									 pendown()

									 right(110)

									 for i in range (100):

									  circle(1000)

									  right(0.13)

									  hues = hues + 1

									  rgb = HSB2RGB(hues)

									  color(rgb[0],rgb[1],rgb[2]) 

									 penup()

									def main():

									 setup(800, 600, 0, 0)

									 bgcolor((0.8, 0.8, 1.0))

									 tracer(False)

									 rainbow()

									 #输出文字

									 tracer(False)

									 goto(100,-100)

									 pendown()

									 color("red")

									 write("服务器之家",align="center",

									   font=("Script MT Bold", 80, "bold"))

									 tracer(True)

									 mainloop()

									if __name__ == "__main__":

									 main()