QBrush Class

     QRadialGradient gradient(50, 50, 50, 50, 50);
     gradient.setColorAt(0, QColor::fromRgbF(0, 1, 0, 1));
     gradient.setColorAt(1, QColor::fromRgbF(0, 0, 0, 0));

     QBrush brush(gradient);

 QPainter painter(this);

 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);

Member Function Documentation

QBrush::QBrush()

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

QBrush::QBrush(Qt::BrushStyle style)

Constructs a black brush with the given style.

See also setStyle().

QBrush::QBrush(const QGradient &gradient)

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).

QBrush::QBrush(const QImage &image)

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

See also setTextureImage().

QBrush::QBrush(const QPixmap &pixmap)

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().

QBrush::QBrush(Qt::GlobalColor color, Qt::BrushStyle style = Qt::SolidPattern)

Constructs a brush with the given color and style.

See also setColor() and setStyle().

QBrush::QBrush(Qt::GlobalColor color, const QPixmap &pixmap)

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.

See also setColor() and setTexture().

QBrush::QBrush(const QColor &color, Qt::BrushStyle style = Qt::SolidPattern)

Constructs a brush with the given color and style.

See also setColor() and setStyle().

QBrush::QBrush(const QColor &color, const QPixmap &pixmap)

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.

See also setColor() and setTexture().

QBrush::QBrush(const QBrush &other)

Constructs a copy of other.

[noexcept] QBrush::~QBrush()

Destroys the brush.

const QColor &QBrush::color() const

Returns the brush color.

See also setColor().

const QGradient *QBrush::gradient() const

Returns the gradient describing this brush.

bool QBrush::isOpaque() const

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.

void QBrush::setColor(const QColor &color)

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().

void QBrush::setColor(Qt::GlobalColor color)

This is an overloaded function.

Sets the brush color to the given color.

void QBrush::setStyle(Qt::BrushStyle style)

Sets the brush style to style.

See also style().

void QBrush::setTexture(const QPixmap &pixmap)

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 QPixmap::depth() == 1 (QBitmaps).

See also texture().

void QBrush::setTextureImage(const QImage &image)

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.

See also textureImage() and setTexture().

void QBrush::setTransform(const QTransform &matrix)

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().

Qt::BrushStyle QBrush::style() const

Returns the brush style.

See also setStyle().

[noexcept] void QBrush::swap(QBrush &other)

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

QPixmap QBrush::texture() const

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

See also setTexture().

QImage QBrush::textureImage() const

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.

See also setTextureImage().

QTransform QBrush::transform() const

Returns the current transformation matrix for the brush.

See also setTransform().

QVariant QBrush::operator QVariant() const

Returns the brush as a QVariant

bool QBrush::operator!=(const QBrush &brush) const

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==().

[noexcept] QBrush &QBrush::operator=(QBrush &&other)

Move-assigns other to this QBrush instance.

QBrush &QBrush::operator=(const QBrush &brush)

Assigns the given brush to this brush and returns a reference to this brush.

bool QBrush::operator==(const QBrush &brush) const

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!=().