python 的笔记

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")
 tracer(True)
 mainloop()
if __name__ == "__main__":
 main()