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add methods to convert colors between rgb and hex values

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wmayer
2019-04-05 13:32:23 +02:00
parent 7f827874f4
commit bef0ba2277
1 changed files with 55 additions and 3 deletions
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58
src/App/Material.h
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@@ -119,16 +119,68 @@ public:
return(T(int(r*255.0),int(g*255.0),int(b*255.0)));
}
/**
* returns color as CSS color "#RRGGBB"
* returns color as hex color "#RRGGBB"
*
*/
std::string asCSSString() {
std::string asHexString() const {
std::stringstream ss;
ss << "#" << std::hex << std::uppercase << std::setfill('0') << std::setw(2) << int(r*255.0)
<< std::setw(2) << int(g*255.0)
<< std::setw(2) << int(b*255.0);
return ss.str();
}
}
/**
* \deprecated
*/
std::string asCSSString() const {
return asHexString();
}
/**
* gets color from hex color "#RRGGBB"
*
*/
bool fromHexString(const std::string& hex) {
if (hex.size() < 7 || hex[0] != '#')
return false;
// #RRGGBB
if (hex.size() == 7) {
std::stringstream ss(hex);
unsigned int rgb;
char c;
ss >> c >> std::hex >> rgb;
int rc = (rgb >> 16) & 0xff;
int gc = (rgb >> 8) & 0xff;
int bc = rgb & 0xff;
r = rc / 255.0f;
g = gc / 255.0f;
b = bc / 255.0f;
return true;
}
// #RRGGBBAA
if (hex.size() == 9) {
std::stringstream ss(hex);
unsigned int rgba;
char c;
ss >> c >> std::hex >> rgba;
int rc = (rgba >> 24) & 0xff;
int gc = (rgba >> 16) & 0xff;
int bc = (rgba >> 8) & 0xff;
int ac = rgba & 0xff;
r = rc / 255.0f;
g = gc / 255.0f;
b = bc / 255.0f;
a = ac / 255.0f;
return true;
}
return false;
}
/// color values, public accessible
float r,g,b,a;