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#include "color.h"
#include <stdio.h>
#include <string.h>
#include <ostream>
#include <sstream>
// Constants
const Color Color::White = Color(1,1,1,1);
const Color Color::Black = Color(0,0,0,1);
Color::Color(const unsigned char* arr)
{
float inv = 1.0 / 255.0;
r = arr[0] * inv;
g = arr[1] * inv;
b = arr[2] * inv;
a = 1.0;
}
Color Color::fromHex(const char* s)
{
// If the color is "none", return any color
// with alpha zero (completely transparent).
if(!strcmp(s, "none"))
{
return Color(0,0,0,0);
}
// Ignore leading hashmark.
if(s[0] == '#')
{
s++;
}
// Set stream formatting to hexadecimal.
std::stringstream ss;
ss << std::hex;
// Convert to integer.
unsigned int rgb;
ss << s;
ss >> rgb;
// Extract 8-byte chunks and normalize.
Color c;
c.r = (float)( ( rgb & 0xFF0000 ) >> 16 ) / 255.0;
c.g = (float)( ( rgb & 0x00FF00 ) >> 8 ) / 255.0;
c.b = (float)( ( rgb & 0x0000FF ) >> 0 ) / 255.0;
c.a = 1.0; // set alpha to 1 (opaque) by default
return c;
}
std::string Color::toHex() const
{
int R = (unsigned char) std::max( 0., std::min( 255.0, 255.0 * r ));
int G = (unsigned char) std::max( 0., std::min( 255.0, 255.0 * g ));
int B = (unsigned char) std::max( 0., std::min( 255.0, 255.0 * b ));
std::stringstream ss;
ss << std::hex;
ss << R << G << B;
return ss.str();
}
std::ostream& operator<<(std::ostream& os, const Color& c)
{
os << "(r=" << c.r;
os << " g=" << c.g;
os << " b=" << c.b;
os << " a=" << c.a;
os << ")";
return os;
}
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