python 的筆記

語言：Python
IDE：Python.IDE

需求

做出彩虹效果

顏色空間

RGB模型：光的三原色，共同決定色相
HSB/HSV模型：H色彩，S深淺，B飽和度，H決定色相
需要將HSB模型轉換為RGB模型

代碼示例：

#-*- coding:utf-8 –*-

from turtle import *

def HSB2RGB(hues):

?hues = hues * 3.59 #100轉成359范圍

?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)

?#繪制彩虹

?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()

?#輸出文字

?tracer(False)

?goto(100,-100)

?pendown()

?color("red")

?tracer(True)

?mainloop()

if __name__ == "__main__":

?main()

結果

?

?