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/*
math/color.h
This file is part of the Osirion project and is distributed under
the terms of the GNU General Public License version 2
*/
#ifndef __INCLUDED_MATH_COLOR_H__
#define __INCLUDED_MATH_COLOR_H__
#include <iostream>
namespace math
{
/// a class representing an RGBA color value
class Color
{
public:
/// create the default color, white
Color();
/// create a color from float RGBA value
Color(float red, float green, float blue, float alpha=1.0f);
/// create a greyscale color
Color(const float grey, const float=1.0f);
/// create a copy from an existing color
Color(Color const & other);
/// red channel value
float red() const;
/// green channel value
float green() const;
/// blue channel value
float blue() const;
/// alpha channel value
float alpha() const;
/// assignment
void assign(Color const & other);
/// assignment
void assign(float red, float green, float blue, float alpha=1.0f);
/// assignment
void assign(float grey, float alpha=1.0f);
/// assignment operator
Color const &operator=(Color const & other);
/// multiply rgb values with scalar value.
Color operator*(const float scalar) const;
/// multiply rgb values with scalar value.
Color & operator*=(const float scalar);
/// assign a value to an element of this color
/*! WARNING: range is not checked
* @param index the index of the element to assign to ( 0 <= index < 4 )
*/
inline float& operator[](const size_t index) {
return rgba_data[index];
}
/// returns the value of an element of this color
/*! WARNING: range is not checked
* @param index the index of the element to return ( 0 <= index < 4 )
*/
inline float operator[](const size_t index) const {
return rgba_data[index];
}
/// pointer to the internal data
inline float *ptr() const { return (float *) rgba_data; };
/// clamp color values to the 0-1 range
void clamp();
float &r;
float &g;
float &b;
float &a;
private:
float rgba_data[4];
};
/// write color RGB values to stream
std::ostream &operator<<(std::ostream &os, Color const & color);
/// read color RGB values from stream, alpha is set to 1.0
std::istream &operator>>(std::istream & is, Color & color);
/// scalar-with-color multiplication
Color const operator*(float scalar, Color const & color);
} // namespace math
#endif // __INCLUDED_MATH_COLOR_H__
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