Color Class Reference

#include <color.h>

Public Member Functions
	Color ()=default
	Color (const Color &)=default
	Color (Color &&)=default
Color &	operator= (const Color &)=default
Color &	operator= (Color &&)=default
	Color (const AColor &c)
	Color (AColor &&c)
	Color (float R, float G, float B)
	Color (double R, double G, double B)
	Color (int R, int G, int B)
	Color (uint32_t rgb)
	Color (const Point3 &p)
	Color (float af[3])
	Color (RealPixel rp)
	Color (const BMM_Color_24 &c)
	Color (const BMM_Color_32 &c)
	Color (const BMM_Color_48 &c)
	Color (const BMM_Color_64 &c)
	Color (const BMM_Color_fl &c)
void	Black ()
void	White ()
void	ClampMax ()
void	ClampMin ()
void	ClampMinMax ()
float &	operator[] (int i)
const float &	operator[] (int i) const
	operator float * ()
	operator const float * () const
uint32_t	toRGB ()
	operator RealPixel () const
	operator BMM_Color_24 () const
	operator BMM_Color_32 () const
	operator BMM_Color_48 () const
	operator BMM_Color_64 () const
	operator BMM_Color_fl () const
Color	operator- () const
Color	operator+ () const
Color &	operator-= (const Color &)
Color &	operator+= (const Color &)
Color &	operator*= (float)
Color &	operator/= (float)
Color &	operator*= (const Color &)
int	operator== (const Color &p) const
int	operator!= (const Color &p) const
Color	operator- (const Color &) const
Color	operator+ (const Color &) const
Color	operator/ (const Color &) const
Color	operator* (const Color &) const
Color	operator^ (const Color &) const

Public Attributes
float	r = 0.f
	These values are in the range 0.0 to 1.0.
float	g = 0.f
	These values are in the range 0.0 to 1.0.
float	b = 0.f
	These values are in the range 0.0 to 1.0.

Kelvin temperature, black body
float	FindClosestMatchingKelvinTemperature () const
	Finds the kelvin temperature which, when converted to RGB, would generate the closest possible color to the current RGB value.
static Color	FromKelvinTemperature (const float kelvin_temperature, const float intensity=1.0f)
	Calculates the chromacity of a black body radiator at a given temperature in kelvins.

Detailed Description

See also

Class AColor, Structure BMM_Color_24, Structure BMM_Color_32, Structure BMM_Color_48, Structure BMM_Color_64, Structure BMM_Color_fl, Structure RealPixel.

Description:

This class represents color as three floating point values: r, g, and b. All methods of this class are implemented by the system.

Data Members:

float r,g,b;

These values are in the range 0.0 to 1.0.

Constructor & Destructor Documentation

Color() [1/17]

Color ( )

default

Remarks

Constructor. The resulting object should be initialized with one of the initialization methods.

Color() [2/17]

Color ( const Color &  )

default

Color() [3/17]

Color ( Color &&  )

default

Color() [4/17]

Color

(

const AColor &

c

)

Color() [5/17]

Color

(

AColor &&

c

)

Color() [6/17]

Color ( float  R, float  G, float  B  )

inline

Remarks

Constructor. Initializes the Color to the RGB color values passed.

Parameters:

float R

Specifies the red component of the color.

float G

Specifies the green component of the color.

float B

Specifies the blue component of the color.

    {
        r = R;
        g = G;
        b = B;
    }

Color() [7/17]

Color ( double  R, double  G, double  B  )

inline

Remarks

Constructor. Initializes the Color to the RGB color values passed.

Parameters:

double R

Specifies the red component of the color.

double G

Specifies the green component of the color.

double B

Specifies the blue component of the color.

    {
        r = (float)R;
        g = (float)G;
        b = (float)B;
    }

Color() [8/17]

Color ( int  R, int  G, int  B  )

inline

Remarks

Constructor. Initializes the Color to the RGB color values passed.

Parameters:

int R

Specifies the red component of the color.

int G

Specifies the green component of the color.

int B

Specifies the blue component of the color.

    {
        r = (float)R;
        g = (float)G;
        b = (float)B;
    }

Color() [9/17]

Color ( uint32_t  rgb )

explicit

Remarks

Constructor. Initializes the color to the Windows RGB value.

Parameters:

uint32_t rgb

Specifies the initial color via a Windows RGB value.

Color() [10/17]

Color ( const Point3 &  p )

inline

Remarks

Constructor. Initializes the Color to the value of the Point3 passed.

Parameters:

Point3 p

Specifies the color. r=x, g=y, b=z.

    {
        r = p.x;
        g = p.y;
        b = p.z;
    }

Color() [11/17]

Color ( float  af[3] )

inlineexplicit

Remarks

Constructor. Initializes the color to the value passed.

Parameters:

float af[3]

Specifies the color. r=af[0], g=af[1], b=af[2].

    {
        r = af[0];
        g = af[1];
        b = af[2];
    }

Color() [12/17]

Color ( RealPixel  rp )

inlineexplicit

Remarks

Constructor. Initializes the color to the RealPixel structure passed.

Parameters:

RealPixel rp

Specifies the RealPixel format to convert.

    {
        ExpandRealPixel(rp, r, g, b);
    }

Color() [13/17]

Color ( const BMM_Color_24 &  c )

inline

Remarks

Constructor. Initializes this Color from the 24 bit color value passed.

Parameters:

const BMM_Color_24& c

The 24 bit color to initialize from.

    {
        r = float(c.r) / 255.0f;
        g = float(c.g) / 255.0f;
        b = float(c.b) / 255.0f;
    }

Color() [14/17]

Color ( const BMM_Color_32 &  c )

inline

Remarks

Constructor. Initializes this Color from the 32 bit color value passed.

Parameters:

const BMM_Color_32& c

The 32 bit color to initialize from.

    {
        r = float(c.r) / 255.0f;
        g = float(c.g) / 255.0f;
        b = float(c.b) / 255.0f;
    }

Color() [15/17]

Color ( const BMM_Color_48 &  c )

inline

Remarks

Constructor. Initializes this Color from the 48 bit color value passed.

Parameters:

const BMM_Color_48& c

The 48 bit color to initialize from.

    {
        r = float(c.r) / 65535.0f;
        g = float(c.g) / 65535.0f;
        b = float(c.b) / 65535.0f;
    }

Color() [16/17]

Color ( const BMM_Color_64 &  c )

inline

Remarks

Constructor. Initializes this Color from the 64 bit color value passed.

Parameters:

const BMM_Color_64& c

The 64 bit color to initialize from.

    {
        r = float(c.r) / 65535.0f;
        g = float(c.g) / 65535.0f;
        b = float(c.b) / 65535.0f;
    }

Color() [17/17]

Color ( const BMM_Color_fl &  c )

inline

Remarks

Constructor. Initializes this Color from the floating point color passed.

Parameters:

const BMM_Color_fl& c

The floating point color to initialize from. No conversion or scaling is done.

    {
        r = c.r;
        g = c.g;
        b = c.b;
    }

Member Function Documentation

operator=() [1/2]

Color & operator= ( const Color &  )

default

operator=() [2/2]

Color & operator= ( Color &&  )

default

Black()

void Black ( )

inline

Remarks

Sets the Color to black. r = g = b = 0.0f

    {
        r = g = b = 0.0f;
    }

White()

void White ( )

inline

Remarks

Sets the Color to white. r = g = b = 1.0f

    {
        r = g = b = 1.0f;
    }

ClampMax()

void ClampMax

(

)

Remarks

Makes all the components of the Color <= 1.0

ClampMin()

void ClampMin

(

)

Remarks

Makes all the components of the Color >= 0.0

ClampMinMax()

void ClampMinMax

(

)

Remarks

Makes all the components fall in the range [0,1]

operator[]() [1/2]

float & operator[] ( int  i )

inline

Remarks

Access operator.

Parameters:

int i

The index of the component to return.

Returns

0=r, 1=g, 2=b.

    {
        return (&r)[i];
    }

operator[]() [2/2]

const float & operator[] ( int  i ) const

inline

Remarks

Access operator.

Parameters:

int i

The index of the component to return.

Returns

0=r, 1=g, 2=b.

    {
        return (&r)[i];
    }

operator float *()

operator float * ( )

inline

Remarks

Returns a pointer to the red component of the color. This may be used to treat the Color as an array of three floats.

    {
        return (&r);
    }

operator const float *()

operator const float * ( ) const

inline

    {
        return (&r);
    }

toRGB()

uint32_t toRGB ( )

inline

    {
        return MAX_RGB(FLto255(r), FLto255(g), FLto255(b));
    };

operator RealPixel()

operator RealPixel

(

)

const

Remarks

Convert the Color to the RealPixel format.

operator BMM_Color_24()

operator BMM_Color_24 ( ) const

inline

Remarks

Converts this Color to the BMM_Color_24 format.

    {
        BMM_Color_24 c;
        c.r = (uint8_t) int(r * 255.0f);
        c.g = (uint8_t) int(g * 255.0f);
        c.b = (uint8_t) int(b * 255.0f);
        return c;
    }

operator BMM_Color_32()

operator BMM_Color_32 ( ) const

inline

Remarks

Converts this Color to the BMM_Color_32 format.

    {
        BMM_Color_32 c;
        c.r = (uint8_t) int(r * 255.0f);
        c.g = (uint8_t) int(g * 255.0f);
        c.b = (uint8_t) int(b * 255.0f);
        return c;
    }

operator BMM_Color_48()

operator BMM_Color_48 ( ) const

inline

Remarks

Converts this Color to the BMM_Color_48 format.

    {
        BMM_Color_48 c;
        c.r = (uint16_t) int(r * 65535.0f);
        c.g = (uint16_t) int(g * 65535.0f);
        c.b = (uint16_t) int(b * 65535.0f);
        return c;
    }

operator BMM_Color_64()

operator BMM_Color_64 ( ) const

inline

Remarks

Converts this Color to the BMM_Color_64 format.

    {
        BMM_Color_64 c;
        c.r = (uint16_t) int(r * 65535.0f);
        c.g = (uint16_t) int(g * 65535.0f);
        c.b = (uint16_t) int(b * 65535.0f);
        return c;
    }

operator BMM_Color_fl()

operator BMM_Color_fl ( ) const

inline

Remarks

Converts this Color to the BMM_Color_fl format.

    {
        BMM_Color_fl c;
        c.r = r;
        c.g = g;
        c.b = b;
        return c;
    }

operator-() [1/2]

Color operator- ( ) const

inline

Remarks

Unary - operator.

Returns

The Color with the components negated, i.e.

{ return(Color(-r,-g,-b)); }

    {
        return (Color(-r, -g, -b));
    }

operator+() [1/2]

Color operator+ ( ) const

inline

Remarks

Unary + operator.

Returns

The Color itself.

    {
        return *this;
    }

operator-=()

Color & operator-= ( const Color &  a )

inline

Remarks

Subtracts a Color from this Color.

Returns

A Color that is the difference between two Colors.

{
    r -= a.r;
    g -= a.g;
    b -= a.b;
    return *this;
}

operator+=()

Color & operator+= ( const Color &  a )

inline

Remarks

Adds a Color to this Color.

Returns

A Color that is the sum of two Colors.

{
    r += a.r;
    g += a.g;
    b += a.b;
    return *this;
}

operator*=() [1/2]

Color & operator*= ( float  f )

inline

Remarks

Multiplies the components of this Color by a float.

Returns

A Color multiplied by a float.

{
    r *= f;
    g *= f;
    b *= f;
    return *this;
}

operator/=()

Color & operator/= ( float  f )

inline

Remarks

Divides the components of a Color by a float.

Returns

A Color divided by a float.

{
    r /= f;
    g /= f;
    b /= f;
    return *this;
}

operator*=() [2/2]

Color & operator*= ( const Color &  a )

inline

Remarks

Performs element-by-element multiplying between two Colors.

Returns

A Color element-by-element multiplied by another Color.

{
    r *= a.r;
    g *= a.g;
    b *= a.b;
    return *this;
}

operator==()

int operator== ( const Color &  p ) const

inline

Remarks

Test for equality between two Colors.

Returns

Nonzero if the Colors are equal; otherwise 0.

    {
        return ((p.r == r) && (p.g == g) && (p.b == b));
    }

operator!=()

int operator!= ( const Color &  p ) const

inline

Remarks

Tests for inequality between two Colors.

Returns

Nonzero if the Colors are not equal; otherwise 0.

    {
        return ((p.r != r) || (p.g != g) || (p.b != b));
    }

operator-() [2/2]

Color operator- ( const Color &  c ) const

inline

Remarks

Subtracts a Color from a Color.

Returns

A Color that is the difference between two Colors.

{
    return (Color(r - c.r, g - c.g, b - c.b));
}

operator+() [2/2]

Color operator+ ( const Color &  c ) const

inline

Remarks

Adds a Color to a Color.

Returns

A Color that is the difference between two Colors.

{
    return (Color(r + c.r, g + c.g, b + c.b));
}

operator/()

Color operator/ ( const Color &  c ) const

inline

Remarks

Divides a Color by a Color.

Returns

A Color divided by a Color. r/r, g/g, b/b.

{
    return Color(r / c.r, g / c.g, b / c.b);
}

operator*()

Color operator* ( const Color &  c ) const

inline

Remarks

Multiplies a Color by a Color.

Returns

A Color multiplied by a Color. r*r, g*g, b*b.

{
    return Color(r * c.r, g * c.g, b * c.b);
}

operator^()

Color operator^ ( const Color &  c ) const

inline

{
    return Color(g * c.b - b * c.g, b * c.r - r * c.b, r * c.g - g * c.r);
}

FromKelvinTemperature()

static Color FromKelvinTemperature ( const float  kelvin_temperature, const float  intensity = 1.0f  )

static

Calculates the chromacity of a black body radiator at a given temperature in kelvins.

Parameters

kelvin_temperature	The black body temperature in kelvins.
intensity	The intensity of the color to be generated (the luminance Y of the CIE XYZ color from which the RGB color is converted).

Returns

An RGB value, converted from a CIE XYZ color with the calculated chromacity and provided intensity.

Remarks

The returned color components is guaranteed to have positive values, but may exceed 1.0.

FindClosestMatchingKelvinTemperature()

float FindClosestMatchingKelvinTemperature

(

)

const

Finds the kelvin temperature which, when converted to RGB, would generate the closest possible color to the current RGB value.

For a color that was generated from a kelvin temperature, the returned value should match that temperature exactly. But for an arbitrary color, the returned value will only be an approximation (and may vary wildly if the color is very far from the set of valid black body colors).

Returns

The temperature, in kelvins, which would generate the closest matching color to 'this'.

Remarks

This performs a search through the range of valid color temperatures, and may therefore be a bit expensive.

Member Data Documentation

r

float r = 0.f

These values are in the range 0.0 to 1.0.

g

float g = 0.f

These values are in the range 0.0 to 1.0.

b

float b = 0.f

These values are in the range 0.0 to 1.0.