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#pragma once
#include "math/Vector4.h"
#include <cassert>
/**
* \brief
* A Vector4 storing RGBA colour
*
* This class provides certain convenience methods for treating a 4-element
* vector as an RGBA colour, for example, ensuring that the colour values lie
* within the [0.0, 1.0] range.
*/
class Colour4: public Vector4f
{
bool channelValid(double c) const { return c >= 0.0 && c <= 1.0; }
public:
/// Default-construct an invalid colour
Colour4()
: Vector4f(-1, -1, -1, -1)
{
assert(!isValid());
}
/// Initialise a colour with individual components
Colour4(float r, float g, float b, float a)
: Vector4f(r, g, b, a)
{}
/// Construct a Colour4 from a Vector3 and optional alpha
template<typename U>
Colour4(const BasicVector3<U>& vec, float alpha = 1.0f)
: Vector4f(static_cast<ElementType>(vec.x()),
static_cast<ElementType>(vec.y()),
static_cast<ElementType>(vec.z()),
alpha)
{}
/// Construct a Colour4 from a Vector4
template<typename U>
Colour4(const BasicVector4<U>& vec)
: Vector4f(static_cast<ElementType>(vec.x()),
static_cast<ElementType>(vec.y()),
static_cast<ElementType>(vec.z()),
static_cast<ElementType>(vec.w()))
{}
/// Return true if this colour contains valid component values
bool isValid() const
{
return channelValid(x()) && channelValid(y())
&& channelValid(z()) && channelValid(w());
}
public:
/// Useful colour constants
static const Colour4& BLACK()
{
static Colour4 black(0.0f, 0.0f, 0.0f, 1.0f);
return black;
}
static const Colour4& WHITE()
{
static Colour4 white(1.0f, 1.0f, 1.0f, 1.0f);
return white;
}
};
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