qualpal::colors::RGB Class Reference

RGB color representation with values in [0,1] range. More...

#include <colors.h>

Public Member Functions
	RGB ()
	Default constructor initializes RGB to black (0,0,0)
	RGB (const double r, const double g, const double b)
	Construct RGB from normalized values.
	RGB (const std::array< double, 3 > rgb)
	Construct RGB from array of normalized values.
	RGB (const std::string &hex)
	Construct RGB from hexadecimal color string.
	RGB (const char *hex)
	Construct RGB from hexadecimal color string literal.
	RGB (const HSL &hsl)
	Construct RGB from HSL color.
	RGB (const XYZ &xyz)
	Construct RGB from XYZ color.
	RGB (const Lab &lab)
	Construct RGB from Lab color.
	RGB (const LCHab &lch)
	Construct RGB from LCHab color.
bool	operator== (const RGB &other) const
	Equality operator for RGB colors.
bool	operator!= (const RGB &other) const
	Inequality operator for RGB colors.
std::string	hex () const
	Convert RGB to hexadecimal string.
double	r () const
	Get red component [0,1].
double	g () const
	Get green component [0,1].
double	b () const
	Get blue component [0,1].

Detailed Description

RGB color representation with values in [0,1] range.

Represents a color in the standard Red-Green-Blue (RGB) color space. All channel values are normalized to the range [0, 1].

Provides conversion constructors for HSL, XYZ, Lab, and LCHab color spaces. Also supports construction from hexadecimal color strings in "#RRGGBB" or "#RGB" format.

// Create RGB from normalized values
RGB red(1.0, 0.0, 0.0);
 
// Create from hex string (6-digit and 3-digit)
RGB blue("#0000ff");
RGB magenta("#f0f");
 
// Convert to hex
std::string hex = red.hex(); // "#ff0000"

Exceptions

std::invalid_argument

if hex string format is invalid.

See also

HSL, XYZ, Lab, LCHab for conversions.

Definition at line 91 of file colors.h.

Constructor & Destructor Documentation

RGB() [1/8]

qualpal::colors::RGB::RGB	(	const double	r,
		const double	g,
		const double	b
	)

Construct RGB from normalized values.

Parameters

r	Red component [0,1]
g	Green component [0,1]
b	Blue component [0,1]

RGB() [2/8]

qualpal::colors::RGB::RGB

(

const std::array< double, 3 >

rgb

)

Construct RGB from array of normalized values.

Parameters

rgb	Array containing [r, g, b] values in [0,1]

RGB() [3/8]

qualpal::colors::RGB::RGB

(

const std::string &

hex

)

Construct RGB from hexadecimal color string.

Parameters

hex	Hex color string in format "#RRGGBB" or "#RGB"

Exceptions

std::invalid_argument

if hex format is invalid

RGB red("#ff0000");     // 6-digit format
RGB blue("#00f");       // 3-digit format

RGB() [4/8]

qualpal::colors::RGB::RGB ( const char *  hex )

inline

Construct RGB from hexadecimal color string literal.

Parameters

hex	Hex color string in format "#RRGGBB" or "#RGB"

Exceptions

std::invalid_argument

if hex format is invalid

Definition at line 135 of file colors.h.

RGB() [5/8]

qualpal::colors::RGB::RGB

(

const HSL &

hsl

)

Construct RGB from HSL color.

Parameters

hsl	HSL color to convert from

RGB() [6/8]

qualpal::colors::RGB::RGB

(

const XYZ &

xyz

)

Construct RGB from XYZ color.

Parameters

xyz	XYZ color to convert from

RGB() [7/8]

qualpal::colors::RGB::RGB

(

const Lab &

lab

)

Construct RGB from Lab color.

Parameters

lab	Lab color to convert from

RGB() [8/8]

qualpal::colors::RGB::RGB

(

const LCHab &

lch

)

Construct RGB from LCHab color.

Parameters

lch	LCHab color to convert from

Member Function Documentation

b()

double qualpal::colors::RGB::b ( ) const

inline

Get blue component [0,1].

Definition at line 196 of file colors.h.

g()

double qualpal::colors::RGB::g ( ) const

inline

Get green component [0,1].

Definition at line 194 of file colors.h.

hex()

std::string qualpal::colors::RGB::hex

(

)

const

Convert RGB to hexadecimal string.

Returns

Hex color string in format "#rrggbb"

RGB red(1.0, 0.0, 0.0);
std::string hex = red.hex(); // "#ff0000"

operator!=()

bool qualpal::colors::RGB::operator!= ( const RGB &  other ) const

inline

Inequality operator for RGB colors.

Parameters

other

Other RGB color to compare with

Returns

true if RGB colors are not equal, false otherwise

Definition at line 178 of file colors.h.

operator==()

bool qualpal::colors::RGB::operator== ( const RGB &  other ) const

inline

Equality operator for RGB colors.

Parameters

other

Other RGB color to compare with

Returns

true if both RGB colors are equal, false otherwise

Definition at line 167 of file colors.h.

r()

double qualpal::colors::RGB::r ( ) const

inline

Get red component [0,1].

Definition at line 192 of file colors.h.

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The documentation for this class was generated from the following file:

• include/qualpal/colors.h