QColor 类

QColor class provides colors based on RGB, HSV or CMYK values. 更多...

Header: #include <QColor>
qmake: QT += gui

公共类型

enum NameFormat { HexRgb, HexArgb }
enum Spec { Rgb, Hsv, Cmyk, Hsl, Invalid }

公共函数

QColor ()
QColor (Qt::GlobalColor color )
QColor (int r , int g , int b , int a = ...)
QColor (QRgb color )
QColor (QRgba64 rgba64 )
QColor (const QString & name )
QColor (QStringView name )
QColor (const char * name )
QColor (QLatin1String name )
QColor (const QColor & color )
QColor (QColor && other )
int alpha () const
qreal alphaF () const
int black () const
qreal blackF () const
int blue () const
qreal blueF () const
QColor convertTo (QColor::Spec colorSpec ) const
int cyan () const
qreal cyanF () const
QColor darker (int factor = 200) const
void getCmyk (int * c , int * m , int * y , int * k , int * a = nullptr)
void getCmykF (qreal * c , qreal * m , qreal * y , qreal * k , qreal * a = nullptr)
void getHsl (int * h , int * s , int * l , int * a = nullptr) const
void getHslF (qreal * h , qreal * s , qreal * l , qreal * a = nullptr) const
void getHsv (int * h , int * s , int * v , int * a = nullptr) const
void getHsvF (qreal * h , qreal * s , qreal * v , qreal * a = nullptr) const
void getRgb (int * r , int * g , int * b , int * a = nullptr) const
void getRgbF (qreal * r , qreal * g , qreal * b , qreal * a = nullptr) const
int green () const
qreal greenF () const
int hslHue () const
qreal hslHueF () const
int hslSaturation () const
qreal hslSaturationF () const
int hsvHue () const
qreal hsvHueF () const
int hsvSaturation () const
qreal hsvSaturationF () const
int hue () const
qreal hueF () const
bool isValid () const
QColor lighter (int factor = 150) const
int lightness () const
qreal lightnessF () const
int magenta () const
qreal magentaF () const
QString name () const
QString name (QColor::NameFormat format ) const
int red () const
qreal redF () const
QRgb rgb () const
QRgba64 rgba64 () const
QRgb rgba () const
int saturation () const
qreal saturationF () const
void setAlpha (int alpha )
void setAlphaF (qreal alpha )
void setBlue (int blue )
void setBlueF (qreal blue )
void setCmyk (int c , int m , int y , int k , int a = 255)
void setCmykF (qreal c , qreal m , qreal y , qreal k , qreal a = 1.0)
void setGreen (int green )
void setGreenF (qreal green )
void setHsl (int h , int s , int l , int a = 255)
void setHslF (qreal h , qreal s , qreal l , qreal a = 1.0)
void setHsv (int h , int s , int v , int a = 255)
void setHsvF (qreal h , qreal s , qreal v , qreal a = 1.0)
void setNamedColor (const QString & name )
void setNamedColor (QStringView name )
void setNamedColor (QLatin1String name )
void setRed (int red )
void setRedF (qreal red )
void setRgb (int r , int g , int b , int a = 255)
void setRgb (QRgb rgb )
void setRgba64 (QRgba64 rgba )
void setRgbF (qreal r , qreal g , qreal b , qreal a = 1.0)
void setRgba (QRgb rgba )
QColor::Spec spec () const
QColor toCmyk () const
QColor toHsl () const
QColor toHsv () const
QColor toRgb () const
int value () const
qreal valueF () const
int yellow () const
qreal yellowF () const
QVariant operator QVariant () const
bool operator!= (const QColor & color ) const
QColor & operator= (QColor && other )
QColor & operator= (const QColor & color )
QColor & operator= (Qt::GlobalColor color )
bool operator== (const QColor & color ) const

静态公共成员

QStringList colorNames ()
QColor fromCmyk (int c , int m , int y , int k , int a = 255)
QColor fromCmykF (qreal c , qreal m , qreal y , qreal k , qreal a = 1.0)
QColor fromHsl (int h , int s , int l , int a = 255)
QColor fromHslF (qreal h , qreal s , qreal l , qreal a = 1.0)
QColor fromHsv (int h , int s , int v , int a = 255)
QColor fromHsvF (qreal h , qreal s , qreal v , qreal a = 1.0)
QColor fromRgb (QRgb rgb )
QColor fromRgb (int r , int g , int b , int a = 255)
QColor fromRgba64 (ushort r , ushort g , ushort b , ushort a = USHRT_MAX)
QColor fromRgba64 (QRgba64 rgba64 )
QColor fromRgbF (qreal r , qreal g , qreal b , qreal a = 1.0)
QColor fromRgba (QRgb rgba )
bool isValidColor (const QString & name )
bool isValidColor (QStringView name )
bool isValidColor (QLatin1String name )
typedef QRgb
int qAlpha (QRgb rgba )
uint qAlpha (QRgba64 rgba64 )
int qBlue (QRgb rgb )
uint qBlue (QRgba64 rgba64 )
int qGray (int r , int g , int b )
int qGray (QRgb rgb )
int qGreen (QRgb rgb )
uint qGreen (QRgba64 rgba64 )
QRgb qPremultiply (QRgb rgb )
QRgba64 qPremultiply (QRgba64 rgba64 )
int qRed (QRgb rgb )
uint qRed (QRgba64 rgba64 )
QRgb qRgb (int r , int g , int b )
QRgba64 qRgba64 (quint16 r , quint16 g , quint16 b , quint16 a )
QRgba64 qRgba64 (quint64 c )
QRgb qRgba (int r , int g , int b , int a )
QRgb qUnpremultiply (QRgb rgb )
QRgba64 qUnpremultiply (QRgba64 rgba64 )
QDataStream & operator<< (QDataStream & stream , const QColor & color )
QDataStream & operator>> (QDataStream & stream , QColor & color )

详细描述

QColor class provides colors based on RGB, HSV or CMYK values.

A color is normally specified in terms of RGB (red, green, and blue) components, but it is also possible to specify it in terms of HSV (hue, saturation, and value) and CMYK (cyan, magenta, yellow and black) components. In addition a color can be specified using a color name. The color name can be any of the SVG 1.0 color names.

RGB HSV CMYK

QColor constructor creates the color based on RGB values. To create a QColor based on either HSV or CMYK values, use the toHsv () 和 toCmyk () functions respectively. These functions return a copy of the color using the desired format. In addition the static fromRgb (), fromHsv () 和 fromCmyk () functions create colors from the specified values. Alternatively, a color can be converted to any of the three formats using the convertTo () function (returning a copy of the color in the desired format), or any of the setRgb (), setHsv () 和 setCmyk () functions altering this color's format. The spec () function tells how the color was specified.

A color can be set by passing an RGB string (such as "#112233"), or an ARGB string (such as "#ff112233") or a color name (such as "blue"), to the setNamedColor () function. The color names are taken from the SVG 1.0 color names. The name () function returns the name of the color in the format "#RRGGBB". Colors can also be set using setRgb (), setHsv () 和 setCmyk (). To get a lighter or darker color use the lighter () 和 darker () functions respectively.

isValid () function indicates whether a QColor is legal at all. For example, a RGB color with RGB values out of range is illegal. For performance reasons, QColor mostly disregards illegal colors, and for that reason, the result of using an invalid color is undefined.

The color components can be retrieved individually, e.g with red (), hue () 和 cyan (). The values of the color components can also be retrieved in one go using the getRgb (), getHsv () 和 getCmyk () functions. Using the RGB color model, the color components can in addition be accessed with rgb ().

There are several related non-members: QRgb is a typdef for an unsigned int representing the RGB value triplet (r, g, b). Note that it also can hold a value for the alpha-channel (for more information, see the 融合 Alpha 的绘制 section). The qRed (), qBlue () 和 qGreen () functions return the respective component of the given QRgb value, while the qRgb () 和 qRgba () functions create and return the QRgb triplet based on the given component values. Finally, the qAlpha () function returns the alpha component of the provided QRgb , and the qGray () function calculates and return a gray value based on the given value.

QColor is platform and device independent. The QColormap 类把颜色映射到硬件。

For more information about painting in general, see the 描绘系统 文档编制。

整数 vs 浮点数的精度

QColor supports floating point precision and provides floating point versions of all the color components functions, e.g. getRgbF (), hueF () 和 fromCmykF (). Note that since the components are stored using 16-bit integers, there might be minor deviations between the values set using, for example, setRgbF () and the values returned by the getRgbF () function due to rounding.

While the integer based functions take values in the range 0-255 (except hue () which must have values within the range 0-359), the floating point functions accept values in the range 0.0 - 1.0.

融合 Alpha 的绘制

QColor also support alpha-blended outlining and filling. The alpha channel of a color specifies the transparency effect, 0 represents a fully transparent color, while 255 represents a fully opaque color. For example:

// Specify semi-transparent red
painter.setBrush(QColor(255, 0, 0, 127));
painter.drawRect(0, 0, width()/2, height());
// Specify semi-transparent blue
painter.setBrush(QColor(0, 0, 255, 127));
painter.drawRect(0, 0, width(), height()/2);
							

The code above produces the following output:

The alpha channel of a color can be retrieved and set using the alpha () 和 setAlpha () functions if its value is an integer, and alphaF () 和 setAlphaF () if its value is qreal (double). By default, the alpha-channel is set to 255 (opaque). To retrieve and set all the RGB color components (including the alpha-channel) in one go, use the rgba () 和 setRgba () 函数。

预定义的颜色

There are 20 predefined QColors described by the Qt::GlobalColor enum, including black, white, primary and secondary colors, darker versions of these colors and three shades of gray. QColor also recognizes a variety of color names; the static colorNames () function returns a QStringList color names that QColor knows about.

Qt Colors

Additionally, the Qt::color0 , Qt::color1 and Qt::transparent colors are used for special purposes.

Qt::color0 (zero pixel value) and Qt::color1 (non-zero pixel value) are special colors for drawing in QBitmaps. Painting with Qt::color0 sets the bitmap bits to 0 (transparent; i.e., background), and painting with Qt::color1 sets the bits to 1 (opaque; i.e., foreground).

Qt::transparent is used to indicate a transparent pixel. When painting with this value, a pixel value will be used that is appropriate for the underlying pixel format in use.

HSV 颜色模型

The RGB model is hardware-oriented. Its representation is close to what most monitors show. In contrast, HSV represents color in a way more suited to the human perception of color. For example, the relationships "stronger than", "darker than", and "the opposite of" are easily expressed in HSV but are much harder to express in RGB.

HSV, like RGB, has three components:

  • H, for hue, is in the range 0 to 359 if the color is chromatic (not gray), or meaningless if it is gray. It represents degrees on the color wheel familiar to most people. Red is 0 (degrees), green is 120, and blue is 240.

  • S, for saturation, is in the range 0 to 255, and the bigger it is, the stronger the color is. Grayish colors have saturation near 0; very strong colors have saturation near 255.

  • V, for value, is in the range 0 to 255 and represents lightness or brightness of the color. 0 is black; 255 is as far from black as possible.

Here are some examples: pure red is H=0, S=255, V=255; a dark red, moving slightly towards the magenta, could be H=350 (equivalent to -10), S=255, V=180; a grayish light red could have H about 0 (say 350-359 or 0-10), S about 50-100, and S=255.

Qt returns a hue value of -1 for achromatic colors. If you pass a hue value that is too large, Qt forces it into range. Hue 360 or 720 is treated as 0; hue 540 is treated as 180.

In addition to the standard HSV model, Qt provides an alpha-channel to feature alpha-blended drawing .

HSL 颜色模型

HSL is similar to HSV, however instead of the Value parameter, HSL specifies a Lightness parameter which maps somewhat differently to the brightness of the color.

Similarly, the HSL saturation value is not in general the same as the HSV saturation value for the same color. hslSaturation () provides the color's HSL saturation value, while saturation () 和 hsvSaturation () provides the HSV saturation value.

The hue value is defined to be the same in HSL and HSV.

CMYK 颜色模型

While the RGB and HSV color models are used for display on computer monitors, the CMYK model is used in the four-color printing process of printing presses and some hard-copy devices.

CMYK has four components, all in the range 0-255: cyan (C), magenta (M), yellow (Y) and black (K). Cyan, magenta and yellow are called subtractive colors; the CMYK color model creates color by starting with a white surface and then subtracting color by applying the appropriate components. While combining cyan, magenta and yellow gives the color black, subtracting one or more will yield any other color. When combined in various percentages, these three colors can create the entire spectrum of colors.

Mixing 100 percent of cyan, magenta and yellow does produce black, but the result is unsatisfactory since it wastes ink, increases drying time, and gives a muddy colour when printing. For that reason, black is added in professional printing to provide a solid black tone; hence the term 'four color process'.

In addition to the standard CMYK model, Qt provides an alpha-channel to feature alpha-blended drawing .

另请参阅 QPalette and QBrush .

成员类型文档编制

enum QColor:: NameFormat

How to format the output of the name () function

常量 描述
QColor::HexRgb 0 #RRGGBB A "#" character followed by three two-digit hexadecimal numbers (i.e. #RRGGBB ).
QColor::HexArgb 1 #AARRGGBB A "#" character followed by four two-digit hexadecimal numbers (i.e. #AARRGGBB ).

另请参阅 name ().

enum QColor:: Spec

The type of color specified, either RGB, HSV, CMYK or HSL.

常量
QColor::Rgb 1
QColor::Hsv 2
QColor::Cmyk 3
QColor::Hsl 4
QColor::Invalid 0

另请参阅 spec () 和 convertTo ().

成员函数文档编制

QColor:: QColor ()

Constructs an invalid color with the RGB value (0, 0, 0). An invalid color is a color that is not properly set up for the underlying window system.

The alpha value of an invalid color is unspecified.

另请参阅 isValid ().

QColor:: QColor ( Qt::GlobalColor color )

这是重载函数。

构造新颜色采用颜色值 color .

另请参阅 isValid () 和 预定义的颜色 .

QColor:: QColor ( int r , int g , int b , int a = ...)

Constructs a color with the RGB value r , g , b , and the alpha-channel (transparency) value of a .

The color is left invalid if any of the arguments are invalid.

另请参阅 setRgba () 和 isValid ().

QColor:: QColor ( QRgb color )

构造颜色采用值 color . The alpha component is ignored and set to solid.

另请参阅 fromRgb () 和 isValid ().

QColor:: QColor ( QRgba64 rgba64 )

构造颜色采用值 rgba64 .

This function was introduced in Qt 5.6.

另请参阅 fromRgba64 ().

QColor:: QColor (const QString & name )

Constructs a named color in the same way as setNamedColor () 使用给定 name .

The color is left invalid if the name 无法剖析。

另请参阅 setNamedColor (), name (),和 isValid ().

QColor:: QColor ( QStringView name )

Default constructs an instance of QColor.

QColor:: QColor (const char * name )

Constructs a named color in the same way as setNamedColor () 使用给定 name .

这是重载函数。

另请参阅 setNamedColor (), name (),和 isValid ().

QColor:: QColor ( QLatin1String name )

Constructs a named color in the same way as setNamedColor () 使用给定 name .

这是重载函数。

This function was introduced in Qt 5.8.

另请参阅 setNamedColor (), name (),和 isValid ().

QColor:: QColor (const QColor & color )

Constructs a color that is a copy of color .

另请参阅 isValid ().

QColor:: QColor ( QColor && other )

Move-copy constructor.

int QColor:: alpha () const

返回此颜色的 Alpha 颜色分量。

另请参阅 setAlpha (), alphaF (),和 融合 Alpha 的绘制 .

qreal QColor:: alphaF () const

返回此颜色的 Alpha 颜色分量。

另请参阅 setAlphaF (), alpha (),和 融合 Alpha 的绘制 .

int QColor:: black () const

Returns the black color component of this color.

另请参阅 blackF (), getCmyk (),和 CMYK 颜色模型 .

qreal QColor:: blackF () const

Returns the black color component of this color.

另请参阅 black (), getCmykF (),和 CMYK 颜色模型 .

int QColor:: blue () const

Returns the blue color component of this color.

另请参阅 setBlue (), blueF (),和 getRgb ().

qreal QColor:: blueF () const

Returns the blue color component of this color.

另请参阅 setBlueF (), blue (),和 getRgbF ().

[static] QStringList QColor:: colorNames ()

返回 QStringList containing the color names Qt knows about.

另请参阅 预定义的颜色 .

QColor QColor:: convertTo ( QColor::Spec colorSpec ) const

Creates a copy of this color in the format specified by colorSpec .

另请参阅 spec (), toCmyk (), toHsv (), toRgb (),和 isValid ().

int QColor:: cyan () const

Returns the cyan color component of this color.

另请参阅 cyanF (), getCmyk (),和 CMYK 颜色模型 .

qreal QColor:: cyanF () const

Returns the cyan color component of this color.

另请参阅 cyan (), getCmykF (),和 CMYK 颜色模型 .

QColor QColor:: darker ( int factor = 200) const

Returns a darker (or lighter) color, but does not change this object.

factor is greater than 100, this functions returns a darker color. Setting factor to 300 returns a color that has one-third the brightness. If the factor is less than 100, the return color is lighter, but we recommend using the lighter () function for this purpose. If the factor is 0 or negative, the return value is unspecified.

The function converts the current RGB color to HSV, divides the value (V) component by factor and converts the color back to RGB.

This function was introduced in Qt 4.3.

另请参阅 lighter () 和 isValid ().

[static] QColor QColor:: fromCmyk ( int c , int m , int y , int k , int a = 255)

Static convenience function that returns a QColor constructed from the given CMYK color values: c (cyan), m (magenta), y (yellow), k (black), and a (alpha-channel, i.e. transparency).

All the values must be in the range 0-255.

另请参阅 toCmyk (), fromCmykF (), isValid (),和 CMYK 颜色模型 .

[static] QColor QColor:: fromCmykF ( qreal c , qreal m , qreal y , qreal k , qreal a = 1.0)

这是重载函数。

Static convenience function that returns a QColor constructed from the given CMYK color values: c (cyan), m (magenta), y (yellow), k (black), and a (alpha-channel, i.e. transparency).

All the values must be in the range 0.0-1.0.

另请参阅 toCmyk (), fromCmyk (), isValid (),和 CMYK 颜色模型 .

[static] QColor QColor:: fromHsl ( int h , int s , int l , int a = 255)

Static convenience function that returns a QColor constructed from the HSV color values, h (hue), s (saturation), l (lightness), and a (alpha-channel, i.e. transparency).

The value of s , l ,和 a must all be in the range 0-255; the value of h must be in the range 0-359.

This function was introduced in Qt 4.6.

另请参阅 toHsl (), fromHslF (), isValid (),和 HSL 颜色模型 .

[static] QColor QColor:: fromHslF ( qreal h , qreal s , qreal l , qreal a = 1.0)

这是重载函数。

Static convenience function that returns a QColor constructed from the HSV color values, h (hue), s (saturation), l (lightness), and a (alpha-channel, i.e. transparency).

All the values must be in the range 0.0-1.0.

This function was introduced in Qt 4.6.

另请参阅 toHsl (), fromHsl (), isValid (),和 HSL 颜色模型 .

[static] QColor QColor:: fromHsv ( int h , int s , int v , int a = 255)

Static convenience function that returns a QColor constructed from the HSV color values, h (hue), s (saturation), v (value), and a (alpha-channel, i.e. transparency).

The value of s , v ,和 a must all be in the range 0-255; the value of h must be in the range 0-359.

另请参阅 toHsv (), fromHsvF (), isValid (),和 HSV 颜色模型 .

[static] QColor QColor:: fromHsvF ( qreal h , qreal s , qreal v , qreal a = 1.0)

这是重载函数。

Static convenience function that returns a QColor constructed from the HSV color values, h (hue), s (saturation), v (value), and a (alpha-channel, i.e. transparency).

All the values must be in the range 0.0-1.0.

另请参阅 toHsv (), fromHsv (), isValid (),和 HSV 颜色模型 .

[static] QColor QColor:: fromRgb ( QRgb rgb )

Static convenience function that returns a QColor constructed from the given QRgb value rgb .

The alpha component of rgb is ignored (i.e. it is automatically set to 255), use the fromRgba () function to include the alpha-channel specified by the given QRgb value.

另请参阅 fromRgba (), fromRgbF (), toRgb (),和 isValid ().

[static] QColor QColor:: fromRgb ( int r , int g , int b , int a = 255)

Static convenience function that returns a QColor constructed from the RGB color values, r (red), g (green), b (blue), and a (alpha-channel, i.e. transparency).

All the values must be in the range 0-255.

另请参阅 toRgb (), fromRgba64 (), fromRgbF (),和 isValid ().

[static] QColor QColor:: fromRgba64 ( ushort r , ushort g , ushort b , ushort a = USHRT_MAX)

Static convenience function that returns a QColor constructed from the RGBA64 color values, r (red), g (green), b (blue), and a (alpha-channel, i.e. transparency).

This function was introduced in Qt 5.6.

另请参阅 fromRgb (), fromRgbF (), toRgb (),和 isValid ().

[static] QColor QColor:: fromRgba64 ( QRgba64 rgba64 )

Static convenience function that returns a QColor constructed from the given QRgba64 value rgba64 .

This function was introduced in Qt 5.6.

另请参阅 fromRgb (), fromRgbF (), toRgb (),和 isValid ().

[static] QColor QColor:: fromRgbF ( qreal r , qreal g , qreal b , qreal a = 1.0)

Static convenience function that returns a QColor constructed from the RGB color values, r (red), g (green), b (blue), and a (alpha-channel, i.e. transparency).

All the values must be in the range 0.0-1.0.

另请参阅 fromRgb (), fromRgba64 (), toRgb (),和 isValid ().

[static] QColor QColor:: fromRgba ( QRgb rgba )

Static convenience function that returns a QColor constructed from the given QRgb value rgba .

不像 fromRgb () function, the alpha-channel specified by the given QRgb value is included.

另请参阅 fromRgb (), fromRgba64 (),和 isValid ().

void QColor:: getCmyk ( int * c , int * m , int * y , int * k , int * a = nullptr)

Sets the contents pointed to by c , m , y , k ,和 a , to the cyan, magenta, yellow, black, and alpha-channel (transparency) components of the color's CMYK value.

These components can be retrieved individually using the cyan (), magenta (), yellow (), black () 和 alpha () 函数。

另请参阅 setCmyk () 和 CMYK 颜色模型 .

void QColor:: getCmykF ( qreal * c , qreal * m , qreal * y , qreal * k , qreal * a = nullptr)

Sets the contents pointed to by c , m , y , k ,和 a , to the cyan, magenta, yellow, black, and alpha-channel (transparency) components of the color's CMYK value.

These components can be retrieved individually using the cyanF (), magentaF (), yellowF (), blackF () 和 alphaF () 函数。

另请参阅 setCmykF () 和 CMYK 颜色模型 .

void QColor:: getHsl ( int * h , int * s , int * l , int * a = nullptr) const

Sets the contents pointed to by h , s , l ,和 a , to the hue, saturation, lightness, and alpha-channel (transparency) components of the color's HSL value.

These components can be retrieved individually using the hslHue (), hslSaturation (), lightness () 和 alpha () 函数。

This function was introduced in Qt 4.6.

另请参阅 getHslF (), setHsl (),和 HSL 颜色模型 .

void QColor:: getHslF ( qreal * h , qreal * s , qreal * l , qreal * a = nullptr) const

Sets the contents pointed to by h , s , l ,和 a , to the hue, saturation, lightness, and alpha-channel (transparency) components of the color's HSL value.

These components can be retrieved individually using the hslHueF (), hslSaturationF (), lightnessF () 和 alphaF () 函数。

This function was introduced in Qt 4.6.

另请参阅 getHsl (), setHslF (),和 HSL 颜色模型 .

void QColor:: getHsv ( int * h , int * s , int * v , int * a = nullptr) const

Sets the contents pointed to by h , s , v ,和 a , to the hue, saturation, value, and alpha-channel (transparency) components of the color's HSV value.

These components can be retrieved individually using the hue (), saturation (), value () 和 alpha () 函数。

另请参阅 setHsv () 和 HSV 颜色模型 .

void QColor:: getHsvF ( qreal * h , qreal * s , qreal * v , qreal * a = nullptr) const

Sets the contents pointed to by h , s , v ,和 a , to the hue, saturation, value, and alpha-channel (transparency) components of the color's HSV value.

These components can be retrieved individually using the hueF (), saturationF (), valueF () 和 alphaF () 函数。

另请参阅 setHsv () 和 HSV 颜色模型 .

void QColor:: getRgb ( int * r , int * g , int * b , int * a = nullptr) const

Sets the contents pointed to by r , g , b ,和 a , to the red, green, blue, and alpha-channel (transparency) components of the color's RGB value.

These components can be retrieved individually using the red (), green (), blue () 和 alpha () 函数。

另请参阅 rgb () 和 setRgb ().

void QColor:: getRgbF ( qreal * r , qreal * g , qreal * b , qreal * a = nullptr) const

Sets the contents pointed to by r , g , b ,和 a , to the red, green, blue, and alpha-channel (transparency) components of the color's RGB value.

These components can be retrieved individually using the redF (), greenF (), blueF () 和 alphaF () 函数。

另请参阅 rgb () 和 setRgb ().

int QColor:: green () const

Returns the green color component of this color.

另请参阅 setGreen (), greenF (),和 getRgb ().

qreal QColor:: greenF () const

Returns the green color component of this color.

另请参阅 setGreenF (), green (),和 getRgbF ().

int QColor:: hslHue () const

Returns the HSL hue color component of this color.

This function was introduced in Qt 4.6.

另请参阅 hslHueF (), hsvHue (), getHsl (),和 HSL 颜色模型 .

qreal QColor:: hslHueF () const

Returns the HSL hue color component of this color.

This function was introduced in Qt 4.6.

另请参阅 hslHue (), hsvHueF (),和 getHslF ().

int QColor:: hslSaturation () const

Returns the HSL saturation color component of this color.

This function was introduced in Qt 4.6.

另请参阅 hslSaturationF (), hsvSaturation (), getHsl (),和 HSL 颜色模型 .

qreal QColor:: hslSaturationF () const

Returns the HSL saturation color component of this color.

This function was introduced in Qt 4.6.

另请参阅 hslSaturation (), hsvSaturationF (), getHslF (),和 HSL 颜色模型 .

int QColor:: hsvHue () const

Returns the HSV hue color component of this color.

另请参阅 hueF (), hslHue (), getHsv (),和 HSV 颜色模型 .

qreal QColor:: hsvHueF () const

Returns the hue color component of this color.

另请参阅 hue (), hslHueF (), getHsvF (),和 HSV 颜色模型 .

int QColor:: hsvSaturation () const

Returns the HSV saturation color component of this color.

另请参阅 saturationF (), hslSaturation (), getHsv (),和 HSV 颜色模型 .

qreal QColor:: hsvSaturationF () const

Returns the HSV saturation color component of this color.

另请参阅 saturation (), hslSaturationF (), getHsvF (),和 HSV 颜色模型 .

int QColor:: hue () const

Returns the HSV hue color component of this color.

The color is implicitly converted to HSV.

另请参阅 hsvHue (), hslHue (), hueF (), getHsv (),和 HSV 颜色模型 .

qreal QColor:: hueF () const

Returns the HSV hue color component of this color.

The color is implicitly converted to HSV.

另请参阅 hsvHueF (), hslHueF (), hue (), getHsvF (),和 HSV 颜色模型 .

bool QColor:: isValid () const

返回 true if the color is valid; otherwise returns false .

[static] bool QColor:: isValidColor (const QString & name )

返回 true name is a valid color name and can be used to construct a valid QColor object, otherwise returns false.

It uses the same algorithm used in setNamedColor ().

This function was introduced in Qt 4.7.

另请参阅 setNamedColor ().

[static] bool QColor:: isValidColor ( QStringView name )

这是重载函数。

This function was introduced in Qt 5.10.

[static] bool QColor:: isValidColor ( QLatin1String name )

这是重载函数。

This function was introduced in Qt 5.8.

QColor QColor:: lighter ( int factor = 150) const

Returns a lighter (or darker) color, but does not change this object.

factor is greater than 100, this functions returns a lighter color. Setting factor to 150 returns a color that is 50% brighter. If the factor is less than 100, the return color is darker, but we recommend using the darker () function for this purpose. If the factor is 0 or negative, the return value is unspecified.

The function converts the current RGB color to HSV, multiplies the value (V) component by factor and converts the color back to RGB.

This function was introduced in Qt 4.3.

另请参阅 darker () 和 isValid ().

int QColor:: lightness () const

Returns the lightness color component of this color.

This function was introduced in Qt 4.6.

另请参阅 lightnessF () 和 getHsl ().

qreal QColor:: lightnessF () const

Returns the lightness color component of this color.

This function was introduced in Qt 4.6.

另请参阅 value () 和 getHslF ().

int QColor:: magenta () const

Returns the magenta color component of this color.

另请参阅 magentaF (), getCmyk (),和 CMYK 颜色模型 .

qreal QColor:: magentaF () const

Returns the magenta color component of this color.

另请参阅 magenta (), getCmykF (),和 CMYK 颜色模型 .

QString QColor:: name () const

Returns the name of the color in the format "#RRGGBB"; i.e. a "#" character followed by three two-digit hexadecimal numbers.

另请参阅 setNamedColor ().

QString QColor:: name ( QColor::NameFormat format ) const

Returns the name of the color in the specified format .

This function was introduced in Qt 5.2.

另请参阅 setNamedColor () 和 NameFormat .

int QColor:: red () const

Returns the red color component of this color.

另请参阅 setRed (), redF (),和 getRgb ().

qreal QColor:: redF () const

Returns the red color component of this color.

另请参阅 setRedF (), red (),和 getRgbF ().

QRgb QColor:: rgb () const

Returns the RGB value of the color. The alpha value is opaque.

另请参阅 setRgb (), getRgb (),和 rgba ().

QRgba64 QColor:: rgba64 () const

Returns the RGB64 value of the color, including its alpha.

For an invalid color, the alpha value of the returned color is unspecified.

This function was introduced in Qt 5.6.

另请参阅 setRgba64 (), rgba (),和 rgb ().

QRgb QColor:: rgba () const

Returns the RGB value of the color, including its alpha.

For an invalid color, the alpha value of the returned color is unspecified.

另请参阅 setRgba (), rgb (),和 rgba64 ().

int QColor:: saturation () const

Returns the HSV saturation color component of this color.

The color is implicitly converted to HSV.

另请参阅 hsvSaturation (), hslSaturation (), saturationF (), getHsv (),和 HSV 颜色模型 .

qreal QColor:: saturationF () const

Returns the HSV saturation color component of this color.

The color is implicitly converted to HSV.

另请参阅 hsvSaturationF (), hslSaturationF (), saturation (), getHsvF (),和 HSV 颜色模型 .

void QColor:: setAlpha ( int alpha )

Sets the alpha of this color to alpha . Integer alpha is specified in the range 0-255.

另请参阅 alpha (), alphaF (),和 融合 Alpha 的绘制 .

void QColor:: setAlphaF ( qreal alpha )

Sets the alpha of this color to alpha . qreal alpha is specified in the range 0.0-1.0.

另请参阅 alphaF (), alpha (),和 融合 Alpha 的绘制 .

void QColor:: setBlue ( int blue )

Sets the blue color component of this color to blue . Integer components are specified in the range 0-255.

另请参阅 blue (), blueF (),和 setRgb ().

void QColor:: setBlueF ( qreal blue )

Sets the blue color component of this color to blue . Float components are specified in the range 0.0-1.0.

另请参阅 blueF (), blue (),和 setRgbF ().

void QColor:: setCmyk ( int c , int m , int y , int k , int a = 255)

Sets the color to CMYK values, c (cyan), m (magenta), y (yellow), k (black), and a (alpha-channel, i.e. transparency).

All the values must be in the range 0-255.

另请参阅 getCmyk (), setCmykF (),和 CMYK 颜色模型 .

void QColor:: setCmykF ( qreal c , qreal m , qreal y , qreal k , qreal a = 1.0)

这是重载函数。

Sets the color to CMYK values, c (cyan), m (magenta), y (yellow), k (black), and a (alpha-channel, i.e. transparency).

All the values must be in the range 0.0-1.0.

另请参阅 getCmykF (), setCmyk (),和 CMYK 颜色模型 .

void QColor:: setGreen ( int green )

Sets the green color component of this color to green . Integer components are specified in the range 0-255.

另请参阅 green (), greenF (),和 setRgb ().

void QColor:: setGreenF ( qreal green )

Sets the green color component of this color to green . Float components are specified in the range 0.0-1.0.

另请参阅 greenF (), green (),和 setRgbF ().

void QColor:: setHsl ( int h , int s , int l , int a = 255)

Sets a HSL color value; h is the hue, s is the saturation, l is the lightness and a is the alpha component of the HSL color.

The saturation, value and alpha-channel values must be in the range 0-255, and the hue value must be greater than -1.

This function was introduced in Qt 4.6.

另请参阅 getHsl () 和 setHslF ().

void QColor:: setHslF ( qreal h , qreal s , qreal l , qreal a = 1.0)

Sets a HSL color lightness; h is the hue, s is the saturation, l is the lightness and a is the alpha component of the HSL color.

All the values must be in the range 0.0-1.0.

This function was introduced in Qt 4.6.

另请参阅 getHslF () 和 setHsl ().

void QColor:: setHsv ( int h , int s , int v , int a = 255)

Sets a HSV color value; h is the hue, s is the saturation, v is the value and a is the alpha component of the HSV color.

The saturation, value and alpha-channel values must be in the range 0-255, and the hue value must be greater than -1.

另请参阅 getHsv (), setHsvF (),和 HSV 颜色模型 .

void QColor:: setHsvF ( qreal h , qreal s , qreal v , qreal a = 1.0)

Sets a HSV color value; h is the hue, s is the saturation, v is the value and a is the alpha component of the HSV color.

All the values must be in the range 0.0-1.0.

另请参阅 getHsvF (), setHsv (),和 HSV 颜色模型 .

void QColor:: setNamedColor (const QString & name )

Sets the RGB value of this QColor to name , which may be in one of these formats:

  • #RGB (each of R, G, and B is a single hex digit)
  • #RRGGBB
  • #AARRGGBB (Since 5.2)
  • #RRRGGGBBB
  • #RRRRGGGGBBBB
  • A name from the list of colors defined in the list of SVG color keyword names provided by the World Wide Web Consortium; for example, "steelblue" or "gainsboro". These color names work on all platforms. Note that these color names are not the same as defined by the Qt::GlobalColor enums, e.g. "green" and Qt::green does not refer to the same color.
  • transparent - representing the absence of a color.

The color is invalid if name 无法剖析。

另请参阅 QColor (), name (),和 isValid ().

void QColor:: setNamedColor ( QStringView name )

这是重载函数。

This function was introduced in Qt 5.10.

void QColor:: setNamedColor ( QLatin1String name )

这是重载函数。

This function was introduced in Qt 5.8.

void QColor:: setRed ( int red )

Sets the red color component of this color to red . Integer components are specified in the range 0-255.

另请参阅 red (), redF (),和 setRgb ().

void QColor:: setRedF ( qreal red )

Sets the red color component of this color to red . Float components are specified in the range 0.0-1.0.

另请参阅 redF (), red (),和 setRgbF ().

void QColor:: setRgb ( int r , int g , int b , int a = 255)

Sets the RGB value to r , g , b and the alpha value to a .

All the values must be in the range 0-255.

另请参阅 rgb (), getRgb (),和 setRgbF ().

void QColor:: setRgb ( QRgb rgb )

这是重载函数。

Sets the RGB value to rgb . The alpha value is set to opaque.

void QColor:: setRgba64 ( QRgba64 rgba )

把 RGB64 值设置为 rgba , including its alpha.

This function was introduced in Qt 5.6.

另请参阅 setRgba () 和 rgba64 ().

void QColor:: setRgbF ( qreal r , qreal g , qreal b , qreal a = 1.0)

Sets the color channels of this color to r (red), g (green), b (blue) and a (alpha, transparency).

All values must be in the range 0.0-1.0.

另请参阅 rgb (), getRgbF (),和 setRgb ().

void QColor:: setRgba ( QRgb rgba )

Sets the RGB value to rgba , including its alpha.

另请参阅 rgba (), rgb (),和 setRgba64 ().

QColor::Spec QColor:: spec () const

返回如何指定颜色。

另请参阅 Spec and convertTo ().

QColor QColor:: toCmyk () const

Creates and returns a CMYK QColor based on this color.

另请参阅 fromCmyk (), convertTo (), isValid (),和 CMYK 颜色模型 .

QColor QColor:: toHsl () const

Creates and returns an HSL QColor based on this color.

另请参阅 fromHsl (), convertTo (), isValid (),和 HSL 颜色模型 .

QColor QColor:: toHsv () const

Creates and returns an HSV QColor based on this color.

另请参阅 fromHsv (), convertTo (), isValid (),和 HSV 颜色模型 .

QColor QColor:: toRgb () const

Create and returns an RGB QColor based on this color.

另请参阅 fromRgb (), convertTo (),和 isValid ().

int QColor:: value () const

Returns the value color component of this color.

另请参阅 valueF (), getHsv (),和 HSV 颜色模型 .

qreal QColor:: valueF () const

Returns the value color component of this color.

另请参阅 value (), getHsvF (),和 HSV 颜色模型 .

int QColor:: yellow () const

Returns the yellow color component of this color.

另请参阅 yellowF (), getCmyk (),和 CMYK 颜色模型 .

qreal QColor:: yellowF () const

Returns the yellow color component of this color.

另请参阅 yellow (), getCmykF (),和 CMYK 颜色模型 .

QVariant QColor:: operator QVariant () const

Returns the color as a QVariant

bool QColor:: operator!= (const QColor & color ) const

返回 true if this color has a different RGB and alpha values from color ;否则返回 false .

QColor &QColor:: operator= ( QColor && other )

Move-assignment operator.

QColor &QColor:: operator= (const QColor & color )

Assigns a copy of color to this color, and returns a reference to it.

QColor &QColor:: operator= ( Qt::GlobalColor color )

这是重载函数。

Assigns a copy of color and returns a reference to this color.

bool QColor:: operator== (const QColor & color ) const

返回 true if this color has the same RGB and alpha values as color ;否则返回 false .

相关非成员

typedef QRgb

格式为 #AARRGGBB 的 ARGB 四元组,相当于无符号整数。

The type also holds a value for the alpha-channel. The default alpha channel is ff , i.e opaque. For more information, see the 融合 Alpha 的绘制 章节。

另请参阅 QColor::rgb () 和 QColor::rgba ().

int qAlpha ( QRgb rgba )

Returns the alpha component of the ARGB quadruplet rgba .

另请参阅 qRgb () 和 QColor::alpha ().

uint qAlpha ( QRgba64 rgba64 )

Returns the alpha component of rgba64 as an 8-bit value.

This function was introduced in Qt 5.6.

另请参阅 QRgba64::alpha8 () 和 QColor::alpha ().

int qBlue ( QRgb rgb )

Returns the blue component of the ARGB quadruplet rgb .

另请参阅 qRgb () 和 QColor::blue ().

uint qBlue ( QRgba64 rgba64 )

Returns the blue component of rgba64 as an 8-bit value.

This function was introduced in Qt 5.6.

另请参阅 QRgba64::blue8 () 和 QColor::blue ().

int qGray ( int r , int g , int b )

Returns a gray value (0 to 255) from the ( r , g , b ) triplet.

The gray value is calculated using the formula ( r * 11 + g * 16 + b * 5)/32.

int qGray ( QRgb rgb )

这是重载函数。

Returns a gray value (0 to 255) from the given ARGB quadruplet rgb .

The gray value is calculated using the formula (R * 11 + G * 16 + B * 5)/32; the alpha-channel is ignored.

int qGreen ( QRgb rgb )

Returns the green component of the ARGB quadruplet rgb .

另请参阅 qRgb () 和 QColor::green ().

uint qGreen ( QRgba64 rgba64 )

Returns the green component of rgba64 as an 8-bit value.

This function was introduced in Qt 5.6.

另请参阅 QRgba64::green8 () 和 QColor::green ().

QRgb qPremultiply ( QRgb rgb )

Converts an unpremultiplied ARGB quadruplet rgb into a premultiplied ARGB quadruplet.

This function was introduced in Qt 5.3.

另请参阅 qUnpremultiply ().

QRgba64 qPremultiply ( QRgba64 rgba64 )

Converts an unpremultiplied QRgba64 quadruplet rgba64 into a premultiplied QRgba64 四元组。

This function was introduced in Qt 5.6.

另请参阅 QRgba64::premultiplied () 和 qUnpremultiply ().

int qRed ( QRgb rgb )

Returns the red component of the ARGB quadruplet rgb .

另请参阅 qRgb () 和 QColor::red ().

uint qRed ( QRgba64 rgba64 )

Returns the red component of rgba64 as an 8-bit value.

This function was introduced in Qt 5.6.

另请参阅 QRgba64::red8 () 和 QColor::red ().

QRgb qRgb ( int r , int g , int b )

Returns the ARGB quadruplet (255, r , g , b ).

另请参阅 qRgba (), qRed (), qGreen (),和 qBlue ().

QRgba64 qRgba64 ( quint16 r , quint16 g , quint16 b , quint16 a )

返回 QRgba64 quadruplet ( r , g , b , a ).

This function was introduced in Qt 5.6.

另请参阅 qRgba ().

QRgba64 qRgba64 ( quint64 c )

返回 c as a QRgba64 struct.

This function was introduced in Qt 5.6.

另请参阅 qRgba ().

QRgb qRgba ( int r , int g , int b , int a )

返回 ARGB 四元组 ( a , r , g , b ).

另请参阅 qRgb (), qRed (), qGreen (),和 qBlue ().

QRgb qUnpremultiply ( QRgb rgb )

Converts a premultiplied ARGB quadruplet rgb into an unpremultiplied ARGB quadruplet.

This function was introduced in Qt 5.3.

另请参阅 qPremultiply ().

QRgba64 qUnpremultiply ( QRgba64 rgba64 )

Converts a premultiplied QRgba64 quadruplet rgba64 into an unpremultiplied QRgba64 四元组。

This function was introduced in Qt 5.6.

另请参阅 QRgba64::unpremultiplied () 和 qPremultiply ().

QDataStream & operator<< ( QDataStream & stream , const QColor & color )

写入 color stream .

另请参阅 序列化 Qt 数据类型 .

QDataStream & operator>> ( QDataStream & stream , QColor & color )

读取 color stream .

另请参阅 序列化 Qt 数据类型 .