PySide6.QtGui.QBrush

class QBrush

The QBrush class defines the fill pattern of shapes drawn by QPainter . More…

Synopsis

Methods

Note

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Detailed Description

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

A brush has a style, a color, a gradient and a texture.

The brush style() defines the fill pattern using the Qt::BrushStyle enum. The default brush style is Qt::NoBrush (depending on how you construct a brush). This style tells the painter to not fill shapes. The standard style for filling is Qt::SolidPattern. The style can be set when the brush is created using the appropriate constructor, and in addition the setStyle() function provides means for altering the style once the brush is constructed.

../../_images/brush-styles1.png

The brush color() defines the color of the fill pattern. The color can either be one of Qt’s predefined colors, Qt::GlobalColor, or any other custom QColor . The currently set color can be retrieved and altered using the color() and setColor() functions, respectively.

The gradient() defines the gradient fill used when the current style is either Qt::LinearGradientPattern, Qt::RadialGradientPattern or Qt::ConicalGradientPattern. Gradient brushes are created by giving a QGradient as a constructor argument when creating the QBrush . Qt provides three different gradients: QLinearGradient , QConicalGradient , and QRadialGradient - all of which inherit QGradient .

gradient = QRadialGradient(50, 50, 50, 50, 50)
gradient.setColorAt(0, QColor.fromRgbF(0, 1, 0, 1))
gradient.setColorAt(1, QColor.fromRgbF(0, 0, 0, 0))
brush = QBrush(gradient)

The texture() defines the pixmap used when the current style is Qt::TexturePattern. You can create a brush with a texture by providing the pixmap when the brush is created or by using setTexture() .

Note that applying setTexture() makes style() == Qt::TexturePattern, regardless of previous style settings. Also, calling setColor() will not make a difference if the style is a gradient. The same is the case if the style is Qt::TexturePattern style unless the current texture is a QBitmap .

The isOpaque() function returns true if the brush is fully opaque otherwise false. A brush is considered opaque if:

  • The alpha component of the color() is 255.

  • Its texture() does not have an alpha channel and is not a QBitmap .

  • The colors in the gradient() all have an alpha component that is 255.

brush-outline1 Outlines

To specify the style and color of lines and outlines, use the QPainter ‘s pen combined with Qt::PenStyle and Qt::GlobalColor:

painter = QPainter(self)
painter.setBrush(Qt.cyan)
painter.setPen(Qt.darkCyan)
painter.drawRect(0, 0, 100,100)
painter.setBrush(Qt.NoBrush)
painter.setPen(Qt.darkGreen)
painter.drawRect(40, 40, 100, 100)

Note that, by default, QPainter renders the outline (using the currently set pen) when drawing shapes. Use painter.setPen(Qt::NoPen) to disable this behavior.

For more information about painting in general, see the Paint System .

See also

QPainter QColor

__init__()

Constructs a default black brush with the style Qt::NoBrush (i.e. this brush will not fill shapes).

__init__(bs)
Parameters:

bs – BrushStyle

Constructs a black brush with the given style.

See also

setStyle()

__init__(brush)
Parameters:

brush – QBrush

Constructs a copy of other.

__init__(gradient)
Parameters:

gradient – QGradient

Constructs a brush based on the given gradient.

The brush style is set to the corresponding gradient style (either Qt::LinearGradientPattern, Qt::RadialGradientPattern or Qt::ConicalGradientPattern).

__init__(image)
Parameters:

image – QImage

Constructs a brush with a black color and a texture set to the given image. The style is set to Qt::TexturePattern.

__init__(pixmap)
Parameters:

pixmap – QPixmap

Constructs a brush with a black color and a texture set to the given pixmap. The style is set to Qt::TexturePattern.

See also

setTexture()

__init__(color[, bs=Qt.SolidPattern])
Parameters:

Constructs a brush with the given color and style.

__init__(color, pixmap)
Parameters:

Constructs a brush with the given color and the custom pattern stored in pixmap.

The style is set to Qt::TexturePattern. The color will only have an effect for QBitmaps.

__init__(color[, bs=Qt.SolidPattern])
Parameters:

Constructs a brush with the given color and style.

__init__(color, pixmap)
Parameters:

Constructs a brush with the given color and the custom pattern stored in pixmap.

The style is set to Qt::TexturePattern. The color will only have an effect for QBitmaps.

color()
Return type:

QColor

Returns the brush color.

See also

setColor()

gradient()
Return type:

QGradient

Returns the gradient describing this brush.

isOpaque()
Return type:

bool

Returns true if the brush is fully opaque otherwise false. A brush is considered opaque if:

  • The alpha component of the color() is 255.

  • Its texture() does not have an alpha channel and is not a QBitmap .

  • The colors in the gradient() all have an alpha component that is 255.

  • It is an extended radial gradient.

__ne__(b)
Parameters:

b – QBrush

Return type:

bool

Returns true if the brush is different from the given brush; otherwise returns false.

Two brushes are different if they have different styles, colors or transforms or different pixmaps or gradients depending on the style.

See also

operator==()

__eq__(b)
Parameters:

b – QBrush

Return type:

bool

Returns true if the brush is equal to the given brush; otherwise returns false.

Two brushes are equal if they have equal styles, colors and transforms and equal pixmaps or gradients depending on the style.

See also

operator!=()

setColor(color)
Parameters:

color – GlobalColor

This is an overloaded function.

Sets the brush color to the given color.

setColor(color)
Parameters:

color – QColor

Sets the brush color to the given color.

Note that calling setColor() will not make a difference if the style is a gradient. The same is the case if the style is Qt::TexturePattern style unless the current texture is a QBitmap .

See also

color()

setStyle(style)
Parameters:

style – BrushStyle

Sets the brush style to style.

See also

style()

setTexture(pixmap)
Parameters:

pixmap – QPixmap

Sets the brush pixmap to pixmap. The style is set to Qt::TexturePattern.

The current brush color will only have an effect for monochrome pixmaps, i.e. for depth() == 1 ( QBitmaps ).

See also

texture()

setTextureImage(image)
Parameters:

image – QImage

Sets the brush image to image. The style is set to Qt::TexturePattern.

Note the current brush color will not have any affect on monochrome images, as opposed to calling setTexture() with a QBitmap . If you want to change the color of monochrome image brushes, either convert the image to QBitmap with QBitmap::fromImage() and set the resulting QBitmap as a texture, or change the entries in the color table for the image.

setTransform(matrix)
Parameters:

matrix – QTransform

Sets matrix as an explicit transformation matrix on the current brush. The brush transformation matrix is merged with QPainter transformation matrix to produce the final result.

See also

transform()

style()
Return type:

BrushStyle

Returns the brush style.

See also

setStyle()

swap(other)
Parameters:

other – QBrush

Swaps this brush with other. This operation is very fast and never fails.

texture()
Return type:

QPixmap

Returns the custom brush pattern, or a null pixmap if no custom brush pattern has been set.

See also

setTexture()

textureImage()
Return type:

QImage

Returns the custom brush pattern, or a null image if no custom brush pattern has been set.

If the texture was set as a QPixmap it will be converted to a QImage .

transform()
Return type:

QTransform

Returns the current transformation matrix for the brush.

See also

setTransform()