This class allows the definition of a colour. The names of the colours are from the X11 specification. color object may be used for numerous applicative purposes. A color is defined by: More...

#include <Quantity_Color.hxx>

Public Member Functions
	Quantity_Color ()
	Creates a colour with the default value of Colour name : YELLOW. More...

	Quantity_Color (const Quantity_NameOfColor AName)
	Creates the colour <AName>. More...

	Quantity_Color (const Quantity_Parameter R1, const Quantity_Parameter R2, const Quantity_Parameter R3, const Quantity_TypeOfColor AType)
	Creates a colour according to the definition system TypeOfColor. TOC_RGB : <R1> the value of red between 0. and 1. <R2> the value of green between 0. and 1. <R3> the value of blue between 0. and 1. More...

void	ChangeContrast (const Quantity_Rate ADelta)
	Increases or decreases the contrast by <ADelta>. <ADelta> is a percentage. Any value greater than zero will increase the contrast. The variation is expressed as a percentage of the current value. It is a variation of the saturation. More...

void	ChangeIntensity (const Quantity_Rate ADelta)
	Increases or decreases the intensity by <ADelta>. <ADelta> is a percentage. Any value greater than zero will increase the intensity. The variation is expressed as a percentage of the current value. It is a variation of the lightness. More...

void	SetValues (const Quantity_NameOfColor AName)
	Updates the colour <me> from the definition of the colour <AName>. More...

void	SetValues (const Quantity_Parameter R1, const Quantity_Parameter R2, const Quantity_Parameter R3, const Quantity_TypeOfColor AType)
	Updates a colour according to the mode specified by TypeOfColor TOC_RGB : <R1> the value of red between 0. and 1. <R2> the value of green between 0. and 1. <R3> the value of blue between 0. and 1. More...

void	Delta (const Quantity_Color &AColor, Quantity_Parameter &DC, Quantity_Parameter &DI) const
	Returns the percentage change of contrast and intensity between <me> and <AColor>. <DC> and <DI> are percentages, either positive or negative. The calculation is with respect to the current value of <me> If <DC> is positive then <me> is more contrasty. If <DI> is positive then <me> is more intense. More...

Standard_Real	Distance (const Quantity_Color &AColor) const
	Returns the distance between two colours. It's a value between 0 and the square root of 3 (the black/white distance) More...

Standard_Real	SquareDistance (const Quantity_Color &AColor) const
	Returns the square of distance between two colours. More...

Quantity_Parameter	Blue () const
	Returns the Blue component (quantity of blue) of the color <me>. More...

Quantity_Parameter	Green () const
	Returns the Green component (quantity of green) of the color <me>. More...

Quantity_Parameter	Hue () const
	Returns the Hue component (hue angle) of the color <me>. More...

Standard_Boolean	IsDifferent (const Quantity_Color &Other) const
	Returns Standard_True if the distance between <me> and <Other> is greater than Epsilon (). More...

Standard_Boolean	operator!= (const Quantity_Color &Other) const

Standard_Boolean	IsEqual (const Quantity_Color &Other) const
	Returns true if the Other color is. More...

Standard_Boolean	operator== (const Quantity_Color &Other) const

Quantity_Parameter	Light () const
	Returns the Light component (value of the lightness) of the color <me>. More...

Quantity_NameOfColor	Name () const
	Returns the name of the color defined by its quantities of red R, green G and blue B; more precisely this is the nearest color from the Quantity_NameOfColor enumeration. Exceptions Standard_OutOfRange if R, G or B is less than 0. or greater than 1. More...

Quantity_Parameter	Red () const
	Returns the Red component (quantity of red) of the color <me>. More...

Quantity_Parameter	Saturation () const
	Returns the Saturation component (value of the saturation) of the color <me>. More...

void	Values (Quantity_Parameter &R1, Quantity_Parameter &R2, Quantity_Parameter &R3, const Quantity_TypeOfColor AType) const
	Returns in R1, R2 and R3 the components of this color according to the color system definition AType. More...

Static Public Member Functions
static void	SetEpsilon (const Quantity_Parameter AnEpsilon)
	Sets the specified value used to compare <me> and an other color in IsDifferent and in IsEqual methods. Warning: The default value is 0.0001. More...

static Quantity_Parameter	Epsilon ()
	Returns the specified value used to compare <me> and an other color in IsDifferent and in IsEqual methods. More...

static Quantity_NameOfColor	Name (const Quantity_Parameter R, const Quantity_Parameter G, const Quantity_Parameter B)
	Returns the name of the colour for which the RGB components are nearest to <R>, <G> and . More...

static Standard_CString	StringName (const Quantity_NameOfColor AColor)
	Returns the name of the color identified by AName in the Quantity_NameOfColor enumeration. For example, the name of the color which corresponds to Quantity_NOC_BLACK is "BLACK". Exceptions Standard_OutOfRange if AName in not known in the Quantity_NameOfColor enumeration. More...

static Standard_Boolean	ColorFromName (const Standard_CString theName, Quantity_NameOfColor &theColor)
	Finds color from predefined names. For example, the name of the color which corresponds to "BLACK" is Quantity_NOC_BLACK. Returns false if name is unknown. More...

static void	HlsRgb (const Quantity_Parameter H, const Quantity_Parameter L, const Quantity_Parameter S, Quantity_Parameter &R, Quantity_Parameter &G, Quantity_Parameter &B)
	Converts HLS components into RGB ones. More...

static void	RgbHls (const Quantity_Parameter R, const Quantity_Parameter G, const Quantity_Parameter B, Quantity_Parameter &H, Quantity_Parameter &L, Quantity_Parameter &S)
	Converts RGB components into HLS ones. More...

static void	Color2argb (const Quantity_Color &theColor, Standard_Integer &theARGB)
	Convert the Color value to ARGB integer value. theARGB has Alpha equal to zero, so the output is formatted as 0x00RRGGBB. More...

static void	Argb2color (const Standard_Integer theARGB, Quantity_Color &theColor)
	Convert integer ARGB value to Color. Alpha bits are ignored. More...

static void	Test ()
	Internal test. More...

Detailed Description

This class allows the definition of a colour. The names of the colours are from the X11 specification. color object may be used for numerous applicative purposes. A color is defined by:

its respective quantities of red, green and blue (R-G-B values), or
its hue angle and its values of lightness and saturation (H-L-S values). These two color definition systems are equivalent. Use this class in conjunction with:
the Quantity_TypeOfColor enumeration which identifies the color definition system you are using,
the Quantity_NameOfColor enumeration which lists numerous predefined colors and identifies them by their name.

Constructor & Destructor Documentation

Quantity_Color::Quantity_Color ( )

Creates a colour with the default value of Colour name : YELLOW.

Quantity_Color::Quantity_Color ( const Quantity_NameOfColor AName )

Creates the colour <AName>.

Quantity_Color::Quantity_Color	(	const Quantity_Parameter	R1,
		const Quantity_Parameter	R2,
		const Quantity_Parameter	R3,
		const Quantity_TypeOfColor	AType
	)

Creates a colour according to the definition system TypeOfColor. TOC_RGB : <R1> the value of red between 0. and 1. <R2> the value of green between 0. and 1. <R3> the value of blue between 0. and 1.

TOC_HLS : <R1> is the hue angle in degrees, 0. being red <R2> is the lightness between 0. and 1. <R3> is the saturation between 0. and 1.

Member Function Documentation

static void Quantity_Color::Argb2color	(	const Standard_Integer	theARGB,
		Quantity_Color &	theColor
	)

static

Convert integer ARGB value to Color. Alpha bits are ignored.

Quantity_Parameter Quantity_Color::Blue ( ) const

Returns the Blue component (quantity of blue) of the color <me>.

void Quantity_Color::ChangeContrast ( const Quantity_Rate ADelta )

Increases or decreases the contrast by <ADelta>. <ADelta> is a percentage. Any value greater than zero will increase the contrast. The variation is expressed as a percentage of the current value. It is a variation of the saturation.

void Quantity_Color::ChangeIntensity ( const Quantity_Rate ADelta )

Increases or decreases the intensity by <ADelta>. <ADelta> is a percentage. Any value greater than zero will increase the intensity. The variation is expressed as a percentage of the current value. It is a variation of the lightness.

static void Quantity_Color::Color2argb	(	const Quantity_Color &	theColor,
		Standard_Integer &	theARGB
	)

static

Convert the Color value to ARGB integer value. theARGB has Alpha equal to zero, so the output is formatted as 0x00RRGGBB.

static Standard_Boolean Quantity_Color::ColorFromName	(	const Standard_CString	theName,
		Quantity_NameOfColor &	theColor
	)

static

Finds color from predefined names. For example, the name of the color which corresponds to "BLACK" is Quantity_NOC_BLACK. Returns false if name is unknown.

void Quantity_Color::Delta	(	const Quantity_Color &	AColor,
		Quantity_Parameter &	DC,
		Quantity_Parameter &	DI
	)		const

Returns the percentage change of contrast and intensity between <me> and <AColor>. <DC> and <DI> are percentages, either positive or negative. The calculation is with respect to the current value of <me> If <DC> is positive then <me> is more contrasty. If <DI> is positive then <me> is more intense.

Standard_Real Quantity_Color::Distance ( const Quantity_Color & AColor ) const

Returns the distance between two colours. It's a value between 0 and the square root of 3 (the black/white distance)

static Quantity_Parameter Quantity_Color::Epsilon ( )

static

Returns the specified value used to compare <me> and an other color in IsDifferent and in IsEqual methods.

Quantity_Parameter Quantity_Color::Green ( ) const

Returns the Green component (quantity of green) of the color <me>.

static void Quantity_Color::HlsRgb	(	const Quantity_Parameter	H,
		const Quantity_Parameter	L,
		const Quantity_Parameter	S,
		Quantity_Parameter &	R,
		Quantity_Parameter &	G,
		Quantity_Parameter &	B
	)

static

Converts HLS components into RGB ones.

Quantity_Parameter Quantity_Color::Hue ( ) const

Returns the Hue component (hue angle) of the color <me>.

Standard_Boolean Quantity_Color::IsDifferent ( const Quantity_Color & Other ) const

Returns Standard_True if the distance between <me> and <Other> is greater than Epsilon ().

Standard_Boolean Quantity_Color::IsEqual ( const Quantity_Color & Other ) const

Returns true if the Other color is.

different from, or
equal to this color. Two colors are considered to be equal if their distance is no greater than Epsilon(). These methods are aliases of operator != and operator ==.

Quantity_Parameter Quantity_Color::Light ( ) const

Returns the Light component (value of the lightness) of the color <me>.

Quantity_NameOfColor Quantity_Color::Name ( ) const

Returns the name of the color defined by its quantities of red R, green G and blue B; more precisely this is the nearest color from the Quantity_NameOfColor enumeration. Exceptions Standard_OutOfRange if R, G or B is less than 0. or greater than 1.

static Quantity_NameOfColor Quantity_Color::Name	(	const Quantity_Parameter	R,
		const Quantity_Parameter	G,
		const Quantity_Parameter	B
	)

static

Returns the name of the colour for which the RGB components are nearest to <R>, <G> and .

Standard_Boolean Quantity_Color::operator!= ( const Quantity_Color & Other ) const

inline

Standard_Boolean Quantity_Color::operator== ( const Quantity_Color & Other ) const

inline

Quantity_Parameter Quantity_Color::Red ( ) const

Returns the Red component (quantity of red) of the color <me>.

static void Quantity_Color::RgbHls	(	const Quantity_Parameter	R,
		const Quantity_Parameter	G,
		const Quantity_Parameter	B,
		Quantity_Parameter &	H,
		Quantity_Parameter &	L,
		Quantity_Parameter &	S
	)

static

Converts RGB components into HLS ones.

Quantity_Parameter Quantity_Color::Saturation ( ) const

Returns the Saturation component (value of the saturation) of the color <me>.

static void Quantity_Color::SetEpsilon ( const Quantity_Parameter AnEpsilon )

static

Sets the specified value used to compare <me> and an other color in IsDifferent and in IsEqual methods. Warning: The default value is 0.0001.

void Quantity_Color::SetValues ( const Quantity_NameOfColor AName )

Updates the colour <me> from the definition of the colour <AName>.

void Quantity_Color::SetValues	(	const Quantity_Parameter	R1,
		const Quantity_Parameter	R2,
		const Quantity_Parameter	R3,
		const Quantity_TypeOfColor	AType
	)

Updates a colour according to the mode specified by TypeOfColor TOC_RGB : <R1> the value of red between 0. and 1. <R2> the value of green between 0. and 1. <R3> the value of blue between 0. and 1.

TOC_HLS : <R1> is the hue angle in degrees, 0. being red <R2> is the lightness between 0. and 1. <R3> is the saturation between 0. and 1.

Standard_Real Quantity_Color::SquareDistance ( const Quantity_Color & AColor ) const

Returns the square of distance between two colours.

static Standard_CString Quantity_Color::StringName ( const Quantity_NameOfColor AColor )

static

Returns the name of the color identified by AName in the Quantity_NameOfColor enumeration. For example, the name of the color which corresponds to Quantity_NOC_BLACK is "BLACK". Exceptions Standard_OutOfRange if AName in not known in the Quantity_NameOfColor enumeration.

static void Quantity_Color::Test ( )

static

Internal test.

void Quantity_Color::Values	(	Quantity_Parameter &	R1,
		Quantity_Parameter &	R2,
		Quantity_Parameter &	R3,
		const Quantity_TypeOfColor	AType
	)		const

Returns in R1, R2 and R3 the components of this color according to the color system definition AType.

if AType is Quantity_TOC_RGB R1 is the quantity of red, R2 is the quantity of green and R3 is the quantity of blue in this color.
if AType is Quantity_TOC_HLS R1 is the hue angle in degrees (0 being red), R2 is the lightness and R3 is the saturation of this color.

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

Quantity_Color.hxx

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation