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/*
math/color.cc
This file is part of the Osirion project and is distributed under
the terms of the GNU General Public License version 2
*/
#include <cstring>
#include "math/color.h"
namespace math
{
Color::Color() :
r(rgba_data[0]),
g(rgba_data[1]),
b(rgba_data[2]),
a(rgba_data[3])
{
assign(1.0f, 1.0f);
}
Color::Color(float red, float green, float blue, float alpha) :
r(rgba_data[0]),
g(rgba_data[1]),
b(rgba_data[2]),
a(rgba_data[3])
{
assign(red, green, blue, alpha);
}
Color::Color(const float grey, const float alpha) :
r(rgba_data[0]),
g(rgba_data[1]),
b(rgba_data[2]),
a(rgba_data[3])
{
assign(grey, alpha);
}
Color::Color(Color const &other) :
r(rgba_data[0]),
g(rgba_data[1]),
b(rgba_data[2]),
a(rgba_data[3])
{
assign(other);
}
void Color::assign(float red, float green, float blue, float alpha)
{
rgba_data[0] = red;
rgba_data[1] = green;
rgba_data[2] = blue;
rgba_data[3] = alpha;
}
void Color::assign(Color const & other)
{
for (int i =0; i < 4; i++)
rgba_data[i] = other.rgba_data[i];
}
void Color::assign(float grey, float alpha)
{
rgba_data[0] = rgba_data[1] = rgba_data[2] = grey;
rgba_data[3] = alpha;
}
const Color & Color::operator=(Color const & other)
{
assign(other);
return *this;
}
void Color::clamp()
{
for (int i =0; i < 4; i++)
if (rgba_data[i] < 0)
rgba_data[i] = 0;
float tmp = rgba_data[0];
if (rgba_data[1] > tmp)
tmp = rgba_data[1];
if (rgba_data[2] > tmp)
tmp = rgba_data[2];
if (tmp > 1) {
for (int i =0; i < 3; i++)
rgba_data[i] /= tmp;
}
if (rgba_data[3] > 1)
rgba_data[3] = 1;
}
float Color::red() const
{
return rgba_data[0];
}
float Color::green() const
{
return rgba_data[1];
}
float Color::blue() const
{
return rgba_data[2];
}
float Color::alpha() const
{
return rgba_data[3];
}
Color Color::operator*(float scalar) const
{
return Color(red()*scalar, green()*scalar, blue()*scalar, alpha());
}
Color const operator*(float scalar, Color const & color)
{
return color * scalar;
}
Color & Color::operator*=(const float scalar)
{
for (int i=0; i < 3; i++)
rgba_data[i] *= scalar;
return (*this);
}
std::ostream &operator<<(std::ostream &os, Color const & color)
{
os << color.red() << " " << color.green() << " " << color.blue(); // << " " << c.alpha();
return os;
}
std::istream &operator>>(std::istream & is, Color & color)
{
is >> color.r;
is >> color.g;
is >> color.b;
//is >> color.a;
color.a = 1.0;
return (is);
}
} // namespace math
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