apppublic/appPublic/set_fgcolor.py
2022-06-15 15:57:42 +08:00

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# -*- coding=utf-8 -*-
"""
kivy color:
[ r, g, b, a]
不同的颜色值总能找到一个人眼感知的灰度值,这是著名的心理学公式:
灰度 = 红×0.299 + 绿×0.587 + 蓝×0.114
当灰度值大于0.5时使用暗色,否则使用明色
colors 两个颜色,缺省为空,使用函数内置的两个颜色
"""
def color_gray_rate(color):
graylevel = 0.299 * color[0] + \
0.587 * color[1] + \
0.114 * color[2]
return graylevel
def get_fgcolor_from_bgcolor(bgcolor, colors=None):
dark_fgcolor=[0.11,0.11,0.11,1]
bright_fgcolor=[0.89,0.89,0.89,1]
graylevel = color_gray_rate(bgcolor)
if colors == None:
if graylevel > 0.5:
return dark_fgcolor
else:
return bright_fgcolor
r1 = color_gray_rate(colors[0])
r2 = color_gray_rate(colors[1])
if abs(graylevel - r1) > abs(graylevel - r2):
return colors[0]
return colors[1]