34 lines
867 B
Python
34 lines
867 B
Python
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# -*- coding=utf-8 -*-
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"""
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kivy color:
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[ r, g, b, a]
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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：
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灰度 = 红×0.299 + 绿×0.587 + 蓝×0.114
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当灰度值大于0.5时使用暗色，否则使用明色
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colors 两个颜色，缺省为空，使用函数内置的两个颜色
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"""
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def color_gray_rate(color):
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graylevel = 0.299 * color[0] + \
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0.587 * color[1] + \
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0.114 * color[2]
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return graylevel
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def get_fgcolor_from_bgcolor(bgcolor, colors=None):
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dark_fgcolor=[0.11,0.11,0.11,1]
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bright_fgcolor=[0.89,0.89,0.89,1]
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graylevel = color_gray_rate(bgcolor)
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if colors == None:
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if graylevel > 0.5:
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return dark_fgcolor
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else:
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return bright_fgcolor
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r1 = color_gray_rate(colors[0])
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r2 = color_gray_rate(colors[1])
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if abs(graylevel - r1) > abs(graylevel - r2):
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return colors[0]
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return colors[1]
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