Color4¶
The Color4
class template represents a 4-component color (red,
green, blue, and alpha), with pre-defined typedefs of unsigned
char
, half
, and float
.
The Color4
class is not derived from Vec4
. Its fields are
named r
, g
, b
, and a
. The class itself implies no
specific interpretation of the values.
There are also various utility functions that operate on colors
defined in ImathColorAlgo.h
and described in Color Functions.
Example:
#include <Imath/ImathColor.h>
void
color4_example()
{
Imath::C4f r (1.0f, 0.0f, 0.0f, 1.0f);
Imath::C4f g (0.0f, 1.0f, 0.0f, 1.0f);
Imath::C4f b (0.0f, 0.0f, 1.0f, 1.0f);
Imath::C4f w = r + g + b;
assert (w.r == 1.0f);
assert (w.g == 1.0f);
assert (w.b == 1.0f);
assert (w.a == 3.0f);
}
-
template <class T>
classColor4
¶ A 4-channel color class: 3 channels plus alpha.
For convenience, the fields are named
r
,g
, andb
, although this class does not impose interpretation on the channels, which can represent either rgb or hsv color values.Constructors and Assignment
-
Color4
()¶ No initialization by default.
-
constexpr
Color4
(T a)¶ Initialize to
(a a a a)
-
constexpr
Color4
(T a, T b, T c, T d)¶ Initialize to
(a b c d)
-
~Color4
()¶ Destructor.
-
T &
operator[]
(int i)¶ Component-wise value.
-
const T &
operator[]
(int i) const¶ Component-wise value.
Arithmetic and Comparison
Numeric Limits
-
static constexpr T
baseTypeLowest
()¶ Largest possible negative value.
-
static constexpr T
baseTypeMax
()¶ Largest possible positive value.
-
static constexpr T
baseTypeSmallest
()¶ Smallest possible positive value.
-
static constexpr T
baseTypeEpsilon
()¶ Smallest possible e for which 1+e != 1.
-
Warning
doxygenfunction: Unable to resolve multiple matches for function “operator<<” with arguments (std::ostream& s, const Color4<T>& v) in doxygen xml output for project “Imath” from directory: doxyxml/. Potential matches:
- std::ostream &operator<<(std::ostream&, Imath::half)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Color4<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Euler<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Interval<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Line3<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Matrix22<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Matrix33<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Matrix44<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Plane3<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Quat<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Shear6<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Vec2<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Vec3<T>&)
- template <class T>
std::ostream &Imath::operator<<(std::ostream&, const Vec4<T>&)