mike_marquet
asked on
Get a correct text color from a back color !
How can I get a correct text color from a back color so that the text is also visible on a dark back color ?
Last Comment
MacroLand
Did you try to XOR your text color with the back color ?
ASKER
If I do this, the text color becomes the same as the back color.
COLORREF clrText = RGB(0,0,0); // default text color is black
COLORREF clrBack = RGB(0,0,0); // background color is black
=> text color must becomes white
clrText = clrText ^ clrBack => black ?
COLORREF clrText = RGB(0,0,0); // default text color is black
COLORREF clrBack = RGB(0,0,0); // background color is black
=> text color must becomes white
clrText = clrText ^ clrBack => black ?
Even in a professional program if you draw white color line to a white background you wont notice it.
But if you want to see it black
clrText = !(clrText ^ clrBack)
But if you want to see it black
clrText = !(clrText ^ clrBack)
ASKER
It doens't works. The text color stays back on a dark background color.
But I have found a solution using the luminance value :
double GetLuminance(COLORREF clr)
{
return 0.3 * GetRValue(clr) + 0.59 * GetGValue(clr) + 0.11 * GetBValue(clr);
}
COLORREF clrText = GetLuminance() < 120.0 ? RGB(255,255,255) : RGB(0,0,0);
But I have found a solution using the luminance value :
double GetLuminance(COLORREF clr)
{
return 0.3 * GetRValue(clr) + 0.59 * GetGValue(clr) + 0.11 * GetBValue(clr);
}
COLORREF clrText = GetLuminance() < 120.0 ? RGB(255,255,255) : RGB(0,0,0);
Sounds to be a good one but I am not sure if 120 will always work.
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C++
C++ is an intermediate-level general-purpose programming language, not to be confused with C or C#. It was developed as a set of extensions to the C programming language to improve type-safety and add support for automatic resource management, object-orientation, generic programming, and exception handling, among other features.
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