Qt 4.0: QPainter Class Reference

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# QPainter Class Reference
[QtGui module]

The QPainter class performs low-level painting on widgets and other paint devices. More...

    #include <QPainter>

Inherited by Q3Painter, QDirectPainter, and QStylePainter.

- List of all members, including inherited members
- Qt 3 support members

### Public Types

- enum CompositionMode { CompositionMode_SourceOver, CompositionMode_DestinationOver, CompositionMode_Clear, CompositionMode_Source, ..., CompositionMode_Xor }
- enum RenderHint { Antialiasing, TextAntialiasing, SmoothPixmapTransform }
- flags RenderHints

### Public Functions

- QPainter ()
- QPainter ( QPaintDevice * pd )
- ~QPainter ()
- const QBrush & background () const
- Qt::BGMode backgroundMode () const
- bool begin ( QPaintDevice * pd )
- QRectF boundingRect ( const QRectF & rect, int flags, const QString & str )
- QRectF boundingRect ( const QRectF & rectangle, const QString & text, const QTextOption & option = QTextOption() )
- QRect boundingRect ( int x, int y, int w, int h, int flags, const QString & text )
- QRect boundingRect ( const QRect & rect, int flags, const QString & str )
- const QBrush & brush () const
- QPoint brushOrigin () const
- QPainterPath clipPath () const
- QRegion clipRegion () const
- CompositionMode compositionMode () const
- QPaintDevice * device () const
- const QMatrix & deviceMatrix () const
- void drawArc ( const QRectF & r, int a, int alen )
- void drawArc ( const QRect & r, int startAngle, int spanAngle )
- void drawArc ( int x, int y, int w, int h, int startAngle, int spanAngle )
- void drawChord ( const QRectF & r, int a, int alen )
- void drawChord ( const QRect & r, int startAngle, int spanAngle )
- void drawChord ( int x, int y, int w, int h, int startAngle, int spanAngle )
- void drawConvexPolygon ( const QPointF * points, int pointCount )
- void drawConvexPolygon ( const QPoint * points, int pointCount )
- void drawConvexPolygon ( const QPolygonF & polygon )
- void drawConvexPolygon ( const QPolygon & polygon )
- void drawEllipse ( const QRectF & r )
- void drawEllipse ( const QRect & r )
- void drawEllipse ( int x, int y, int w, int h )
- void drawImage ( const QRectF & targetRect, const QImage & image, const QRectF & sourceRect, Qt::ImageConversionFlags flags = Qt::AutoColor )
- void drawImage ( const QPointF & p, const QImage & image, const QRectF & sr, Qt::ImageConversionFlags flags = Qt::AutoColor )
- void drawImage ( const QRectF & rectangle, const QImage & image )
- void drawImage ( const QPoint & p, const QImage & image )
- void drawImage ( const QPointF & p, const QImage & image )
- void drawImage ( const QPoint & p, const QImage & image, const QRect & sr, Qt::ImageConversionFlags flags = Qt::AutoColor )
- void drawImage ( const QRect & rectangle, const QImage & image )
- void drawImage ( int x, int y, const QImage & image, int sx = 0, int sy = 0, int sw = -1, int sh = -1, Qt::ImageConversionFlags flags = Qt::AutoColor )
- void drawImage ( const QRect & targetRect, const QImage & image, const QRect & sourceRect, Qt::ImageConversionFlags flags = Qt::AutoColor )
- void drawLine ( const QLineF & line )
- void drawLine ( int x1, int y1, int x2, int y2 )
- void drawLine ( const QPoint & p1, const QPoint & p2 )
- void drawLine ( const QPointF & p1, const QPointF & p2 )
- void drawLine ( const QLine & line )
- void drawLines ( const QLineF * lines, int lineCount )
- void drawLines ( const QVector<QLineF> & lines )
- void drawLines ( const QLine * lines, int lineCount )
- void drawLines ( const QVector<QLine> & lines )
- void drawLines ( const QVector<QPoint> & pointPairs )
- void drawLines ( const QVector<QPointF> & pointPairs )
- void drawLines ( const QPointF * pointPairs, int lineCount )
- void drawLines ( const QPoint * pointPairs, int lineCount )
- void drawPath ( const QPainterPath & path )
- void drawPicture ( const QPointF & p, const QPicture & picture )
- void drawPicture ( int x, int y, const QPicture & picture )
- void drawPicture ( const QPoint & p, const QPicture & picture )
- void drawPie ( const QRectF & r, int a, int alen )
- void drawPie ( const QRect & rect, int startAngle, int spanAngle )
- void drawPie ( int x, int y, int w, int h, int startAngle, int spanAngle )
- void drawPixmap ( const QRectF & r, const QPixmap & pm, const QRectF & sr )
- void drawPixmap ( const QRect & targetRect, const QPixmap & pixmap, const QRect & sourceRect )
- void drawPixmap ( const QPointF & p, const QPixmap & pixmap, const QRectF & sourceRect )
- void drawPixmap ( const QPointF & p, const QPixmap & pixmap )
- void drawPixmap ( int x, int y, const QPixmap & pixmap )
- void drawPixmap ( int x, int y, int width, int height, const QPixmap & pixmap )
- void drawPixmap ( int x, int y, int w, int h, const QPixmap & pm, int sx, int sy, int sw, int sh )
- void drawPixmap ( int x, int y, const QPixmap & pixmap, int sx, int sy, int sw, int sh )
- void drawPixmap ( const QPoint & p, const QPixmap & pm, const QRect & sr )
- void drawPixmap ( const QPoint & p, const QPixmap & pm )
- void drawPixmap ( const QRect & r, const QPixmap & pm )
- void drawPoint ( const QPointF & p )
- void drawPoint ( const QPoint & p )
- void drawPoint ( int x, int y )
- void drawPoints ( const QPointF * points, int pointCount )
- void drawPoints ( const QPolygonF & points )
- void drawPoints ( const QPoint * points, int pointCount )
- void drawPoints ( const QPolygon & points )
- void drawPolygon ( const QPointF * points, int pointCount, Qt::FillRule fillRule = Qt::OddEvenFill )
- void drawPolygon ( const QPolygon & pa, Qt::FillRule fillRule = Qt::OddEvenFill )
- void drawPolygon ( const QPolygonF & pa, Qt::FillRule fillRule = Qt::OddEvenFill )
- void drawPolygon ( const QPoint * points, int pointCount, Qt::FillRule fillRule = Qt::OddEvenFill )
- void drawPolyline ( const QPointF * points, int pointCount )
- void drawPolyline ( const QPolygon & pa )
- void drawPolyline ( const QPolygonF & pa )
- void drawPolyline ( const QPoint * points, int pointCount )
- void drawRect ( const QRectF & r )
- void drawRect ( int x, int y, int w, int h )
- void drawRect ( const QRect & rect )
- void drawRects ( const QRectF * rects, int rectCount )
- void drawRects ( const QVector<QRectF> & rectangles )
- void drawRects ( const QRect * rects, int rectCount )
- void drawRects ( const QVector<QRect> & rectangles )
- void drawRoundRect ( const QRectF & r, int xRnd = 25, int yRnd = 25 )
- void drawRoundRect ( int x, int y, int w, int h, int xRnd = 25, int yRnd = 25 )
- void drawRoundRect ( const QRect & r, int xRnd = 25, int yRnd = 25 )
- void drawText ( const QPointF & p, const QString & str )
- void drawText ( const QRectF & rectangle, const QString & text, const QTextOption & option = QTextOption() )
- void drawText ( int x, int y, const QString & text )
- void drawText ( int x, int y, int w, int h, int flags, const QString & text, QRect * br = 0 )
- void drawText ( const QRect & r, int flags, const QString & str, QRect * br = 0 )
- void drawText ( const QPoint & p, const QString & s )
- void drawText ( const QRectF & r, int flags, const QString & str, QRectF * br = 0 )
- void drawTiledPixmap ( int x, int y, int w, int h, const QPixmap & pixmap, int sx = 0, int sy = 0 )
- void drawTiledPixmap ( const QRect & rect, const QPixmap & pixmap, const QPoint & sp = QPoint() )
- void drawTiledPixmap ( const QRectF & r, const QPixmap & pixmap, const QPointF & sp = QPointF() )
- bool end ()
- void eraseRect ( const QRectF & r )
- void eraseRect ( const QRect & rect )
- void eraseRect ( int x, int y, int w, int h )
- void fillPath ( const QPainterPath & path, const QBrush & brush )
- void fillRect ( const QRectF & r, const QBrush & brush )
- void fillRect ( const QRect & rect, const QBrush & brush )
- void fillRect ( int x, int y, int w, int h, const QBrush & brush )
- const QFont & font () const
- QFontInfo fontInfo () const
- QFontMetrics fontMetrics () const
- bool hasClipping () const
- void initFrom ( const QWidget * widget )
- bool isActive () const
- Qt::LayoutDirection layoutDirection () const
- const QMatrix & matrix () const
- bool matrixEnabled () const
- QPaintEngine * paintEngine () const
- const QPen & pen () const
- RenderHints renderHints () const
- void resetMatrix ()
- void restore ()
- void rotate ( qreal a )
- void save ()
- void scale ( qreal sx, qreal sy )
- void setBackground ( const QBrush & bg )
- void setBackgroundMode ( Qt::BGMode mode )
- void setBrush ( Qt::BrushStyle style )
- void setBrush ( const QBrush & brush )
- void setBrushOrigin ( const QPointF & p )
- void setBrushOrigin ( const QPoint & p )
- void setBrushOrigin ( int x, int y )
- void setClipPath ( const QPainterPath & path, Qt::ClipOperation op = Qt::ReplaceClip )
- void setClipRect ( const QRect & rect, Qt::ClipOperation op = Qt::ReplaceClip )
- void setClipRect ( int x, int y, int w, int h, Qt::ClipOperation op = Qt::ReplaceClip )
- void setClipRect ( const QRectF & rect, Qt::ClipOperation op = Qt::ReplaceClip )
- void setClipRegion ( const QRegion & r, Qt::ClipOperation op = Qt::ReplaceClip )
- void setClipping ( bool enable )
- void setCompositionMode ( CompositionMode mode )
- void setFont ( const QFont & font )
- void setLayoutDirection ( Qt::LayoutDirection direction )
- void setMatrix ( const QMatrix & matrix, bool combine = false )
- void setMatrixEnabled ( bool enable )
- void setPen ( const QPen & pen )
- void setPen ( const QColor & color )
- void setPen ( Qt::PenStyle style )
- void setRenderHint ( RenderHint hint, bool on = true )
- void setViewTransformEnabled ( bool enable )
- void setViewport ( int x, int y, int w, int h )
- void setViewport ( const QRect & r )
- void setWindow ( int x, int y, int w, int h )
- void setWindow ( const QRect & r )
- void shear ( qreal sh, qreal sv )
- void strokePath ( const QPainterPath & path, const QPen & pen )
- void translate ( const QPointF & offset )
- void translate ( qreal dx, qreal dy )
- void translate ( const QPoint & offset )
- bool viewTransformEnabled () const
- QRect viewport () const
- QRect window () const

### Static Public Members

- void setRedirected ( const QPaintDevice * device, QPaintDevice * replacement, const QPoint & offset = QPoint() )

### Related Non-Members

- void qDrawPlainRect ( QPainter * p, int x, int y, int w, int h, const QColor & c, int lineWidth = 1, const QBrush * fill = 0 )
- void qDrawShadeLine ( QPainter * p, int x1, int y1, int x2, int y2, const QPalette & pal, bool sunken = true, int lineWidth = 1, int midLineWidth = 0 )
- void qDrawShadePanel ( QPainter * p, int x, int y, int w, int h, const QPalette & pal, bool sunken = false, int lineWidth = 1, const QBrush * fill = 0 )
- void qDrawShadeRect ( QPainter * p, int x, int y, int w, int h, const QPalette & pal, bool sunken = false, int lineWidth = 1, int midLineWidth = 0, const QBrush * fill = 0 )
- void qDrawWinButton ( QPainter * p, int x, int y, int w, int h, const QPalette & pal, bool sunken = false, const QBrush * fill = 0 )
- void qDrawWinPanel ( QPainter * p, int x, int y, int w, int h, const QPalette & pal, bool sunken = false, const QBrush * fill = 0 )

## Detailed Description

The QPainter class performs low-level painting on widgets and other paint devices.

The painter provides highly optimized functions to do most of the drawing GUI programs require. QPainter can draw everything from simple lines to complex shapes like pies and chords. It can also draw aligned text and pixmaps. Normally, it draws in a "natural" coordinate system, but it can also do view and world transformation.

The typical use of a painter is:

- Construct a painter.
- Set a pen, a brush etc.
- Draw.
- Destroy the painter.

The common use of QPainter is inside a widget's paint event. Here's one simple example:

        void SimpleExampleWidget::paintEvent()
        {
            QPainter paint(this);
            paint.setPen(Qt::blue);
            paint.drawText(rect(), Qt::AlignCenter, "The Text");
        }

If you need to draw a complex shape, especially if you need to do so repeatedly, consider creating a QPainterPath and drawing it using drawPath().

Usage is simple, and there are many settings you can use:

- font() is the currently set font.
- brush() is the currently set brush; the color or pattern that's used for filling e.g. circles.
- pen() is the currently set pen; the color or stipple that's used for drawing lines or boundaries.
- backgroundMode() is `Opaque` or `Transparent`, i.e. whether background() is used or not.
- backgroundColor() only applies when backgroundMode() is Opaque and pen() is a stipple. In that case, it describes the color of the background pixels in the stipple.
- brushOrigin() is the origin of the tiled brushes, normally the origin of widget's background.
- viewport(), window(), matrix() and many more make up the painter's coordinate transformation system. See The Coordinate System for an explanation of this, or see below for a very brief overview of the functions.
- hasClipping() is whether the painter clips at all. (The paint device clips, too.) If the painter clips, it clips to clipRegion().

Note that some of these settings mirror settings in some paint devices, e.g. QWidget::font(). QPainter::begin() (or the QPainter constructor) copies these attributes from the paint device. Calling, for example, QWidget::setFont() doesn't take effect until the next time a painter begins painting on it.

save() saves all of these settings on an internal stack, restore() pops them back.

The core functionality of QPainter is drawing, and there are functions to draw most primitives: drawPoint(), drawPoints(), drawLine(), drawRect(), drawRoundRect(), drawEllipse(), drawArc(), drawPie(), drawChord(), drawLineSegments(), drawPolyline(), drawPolygon(), drawConvexPolygon() and drawCubicBezier(). All of these functions have integer and floating point versions.

There are functions to draw pixmaps/images, namely drawPixmap(), drawImage() and drawTiledPixmap(). Both drawPixmap() and drawImage() produce the same result, except that drawPixmap() is faster on-screen while drawImage() may be faster on a QPrinter or other devices.

Text drawing is done using drawText(). When you need fine-grained positioning, boundingRect() tells you where a given drawText() command would draw.

There is a drawPicture() function that draws the contents of an entire QPicture using this painter. drawPicture() is the only function that disregards all the painter's settings as QPicture has its own settings.

Normally, the QPainter operates on the device's own coordinate system (usually pixels), but QPainter has good support for coordinate transformations. See The Coordinate System for a more general overview and a simple example.

The most common functions used are scale(), rotate(), translate() and shear(), all of which operate on the matrix(). setMatrix() can replace or add to the currently set matrix().

setViewport() sets the rectangle on which QPainter operates. The default is the entire device, which is usually fine. setWindow() sets the coordinate system, that is, the rectangle that maps to viewport(). What's drawn inside the window() ends up being inside the viewport(). The window's default is the same as the viewport.

QPainter can clip any drawing operation to a rectangle, a region, or a vector path. The current clip is available using the functions clipRegion() and clipPath(). Wether paths or regions are preferred (faster) depends on the underlying paintEngine(). For example, the QImage paint engine prefers paths while the X11 paint engine prefers regions. Setting a clip is done in the painters logical coordinates.

After QPainter's clipping, the paint device may also clip. For example, most widgets clip away the pixels used by child widgets, and most printers clip away an area near the edges of the paper. This additional clipping is not reflected by the return value of clipRegion() or hasClipping().

isActive() indicates whether the painter is active. begin() (and the most usual constructor) makes it active. end() (and the destructor) deactivates it. If the painter is active, device() returns the paint device on which the painter paints.

Sometimes it is desirable to make someone else paint on an unusual QPaintDevice. QPainter supports a static function to do this, setRedirected().

setTabStops() and setTabArray() can change where the tab stops are, but these are very seldomly used.

Warning: Unless a widget has the Qt::WA_PaintOutsidePaintEvent attribute set. A QPainter can only be used on a widget inside a paintEvent() or a function called by a paintEvent(). On Mac OS X, you can only paint on a widget in a paintEvent() regardless of this attribute's setting.

See also QPaintDevice, QWidget, QPixmap, QPrinter, QPicture, QPaintEngine, and The Coordinate System.

## Member Type Documentation

### enum QPainter::CompositionMode

Defines one of the Porter-Duff composition operations. Composition modes are used to specify how a source and destination pixel are merged together.

The most common type is SourceOver (often referred to as just alpha blending) where the source pixel is blended on top of the destination pixel in such a way that the alpha component of the source defines the translucensy of the pixel.

Porter Duff operator will only work when the paint device is a QImage in Format::ARGB32_Premultiplied or Format::ARGB32, where the premultiplied version is the preferred format.

When a composition mode is set it applies to all painting operator, pens, brushes, gradients and pixmap/image drawing.

Constant | Value | Description
--- | --- | ---
`QPainter::CompositionMode_SourceOver` | `0` | This is the default mode. The alpha of the source is used to blend the pixel on top of the destination.
`QPainter::CompositionMode_DestinationOver` | `1` | The alpha of the destination is used to blend it on top of the source pixels. This mode is the inverse of CompositionMode_SourceOver.
`QPainter::CompositionMode_Clear` | `2` | The pixels in the destination are cleared (set to fully transparent) independent of the source.
`QPainter::CompositionMode_Source` | `3` | The output is the source pixel. (This means a basic copy operation and is identical to SourceOver when the source pixel is opaque).
`QPainter::CompositionMode_Destination` | `4` | The output is the destination pixel. This means that the blending has no effect. This mode is the inverse of CompositionMode_Source.
`QPainter::CompositionMode_SourceIn` | `5` | The output is the source, where the alpha is reduced by that of the destination.
`QPainter::CompositionMode_DestinationIn` | `6` | The output is the destination, where the alpha is reduced by that of the source. This mode is the inverse of CompositionMode_SourceIn.
`QPainter::CompositionMode_SourceOut` | `7` | The output is the source, where the alpha is reduced by the inverse of destination.
`QPainter::CompositionMode_DestinationOut` | `8` | The output is the destination, where the alpha is reduced by the inverse of the source. This mode is the inverse of CompositionMode_SourceOut.
`QPainter::CompositionMode_SourceAtop` | `9` | The source pixel is blended on top of the destination, with the alpha of the source pixel reduced by the alpha of the destination pixel.
`QPainter::CompositionMode_DestinationAtop` | `10` | The destination pixel is blended on top of the source, with the alpha of the destination pixel is reduced by the alpha of the destination pixel. This mode is the inverse of CompositionMode_SourceAtop.
`QPainter::CompositionMode_Xor` | `11` | The source which alpha reduced with the inverse of the destination is merged with the destination which alpha is reduced by the inverse of the source.

### enum QPainter::RenderHint
flags QPainter::RenderHints

Renderhints are used to specify flags to QPainter that may or may not be respected by any given engine.

Constant | Value | Description
--- | --- | ---
`QPainter::Antialiasing` | `0x01` | Indicates that the engine should antialias edges of primitives if possible.
`QPainter::TextAntialiasing` | `0x02` | Indicates that the engine should antialias text if possible.
`QPainter::SmoothPixmapTransform` | `0x04` | Indicates that the engine should use a smooth pixmap transformation algorithm (such as bilinear) rather than nearest neighbor.

The RenderHints type is a typedef for QFlags<RenderHint>. It stores an OR combination of RenderHint values.

## Member Function Documentation

### QPainter::QPainter ()

Constructs a painter.

Notice that all painter settings (setPen, setBrush etc.) are reset to default values when begin() is called.

See also begin() and end().

### QPainter::QPainter ( QPaintDevice * pd )

Constructs a painter that begins painting the paint device pd immediately.

This constructor is convenient for short-lived painters, e.g. in a paint event and should be used only once. The constructor calls begin() for you and the QPainter destructor automatically calls end().

Here's an example using begin() and end():

        void MyWidget::paintEvent(QPaintEvent *)
        {
            QPainter p;
            p.begin(this);
            p.drawLine(...);        // drawing code
            p.end();
        }

The same example using this constructor:

        void MyWidget::paintEvent(QPaintEvent *)
        {
            QPainter p(this);
            p.drawLine(...);        // drawing code
        }

Since the constructor cannot provide feedback when the initialization of the painter failed you should rather use begin() and end() to paint on external devices, e.g. printers.

See also begin() and end().

### QPainter::~QPainter ()

Destroys the painter.

### const QBrush & QPainter::background () const

Returns the current background brush.

See also setBackground() and QBrush.

### Qt::BGMode QPainter::backgroundMode () const

Returns the current background mode.

See also setBackgroundMode() and Qt::BGMode.

### bool QPainter::begin ( QPaintDevice * pd )

Begins painting the paint device pd and returns true if successful; otherwise returns false.

The errors that can occur are serious problems, such as these:

        p->begin(0); // impossible - paint device cannot be 0

        QPixmap pm(0, 0);
        p->begin(&pm); // impossible - pm.isNull();

        p->begin(myWidget);
        p2->begin(myWidget); // impossible - only one painter at a time

Note that most of the time, you can use one of the constructors instead of begin(), and that end() is automatically done at destruction.

Warning: A paint device can only be painted by one painter at a time.

See also end().

### QRectF QPainter::boundingRect ( const QRectF & rect, int flags, const QString & str )

Returns the bounding rectangle of the aligned text that would be printed with the corresponding drawText() function of the string str. The drawing, and hence the bounding rectangle, is constrained to the rectangle rect, or to the rectangle required to draw the text, whichever is the larger.

The flags argument is the bitwise OR of the following flags:

Flag | Meaning
--- | ---
Qt::AlignLeft | aligns to the left border, or to the right border for right-to-left languages.
Qt::AlignRight | aligns to the right border, or to the left border for right-to-left languages.
Qt::AlignHCenter | aligns horizontally centered.
Qt::AlignTop | aligns to the top border.
Qt::AlignBottom | aligns to the bottom border.
Qt::AlignVCenter | aligns vertically centered.
Qt::AlignCenter | (== Qt::AlignHCenter | Qt::AlignVCenter).
Qt::TextSingleLine | ignores newline characters in the text.
Qt::TextExpandTabs | expands tabs.
Qt::TextShowMnemonic | interprets "&x" as x.
Qt::TextWordWrap | breaks the text to fit the rectangle.

Qt::Horizontal alignment defaults to Qt::AlignLeft and vertical alignment defaults to Qt::AlignTop.

If several of the horizontal or several of the vertical alignment flags are set, the resulting alignment is undefined.

See also Qt::TextFlag.

### QRectF QPainter::boundingRect ( const QRectF & rectangle, const QString & text, const QTextOption & option = QTextOption() )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns the bounding rectangle for the given text when placed within the specified rectangle. The option can be used to control the way the text is positioned and orientated.

### QRect QPainter::boundingRect ( int x, int y, int w, int h, int flags, const QString & text )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns the bounding rectangle of the characters in the given text, constrained by the rectangle beginning at the point (x, y) with width w and height h.

### QRect QPainter::boundingRect ( const QRect & rect, int flags, const QString & str )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns the bounding rectangle constrained by rectangle rect.

### const QBrush & QPainter::brush () const

Returns the painter's current brush.

See also QPainter::setBrush().

### QPoint QPainter::brushOrigin () const

Returns the brush origin currently set.

See also setBrushOrigin().

### QPainterPath QPainter::clipPath () const

Returns the currently clip as a path. Note that the clip path is given in logical coordinates and subject to coordinate transformation

See also setClipPath().

### QRegion QPainter::clipRegion () const

Returns the currently set clip region. Note that the clip region is given in logical coordinates and subject to coordinate transformation.

See also setClipRegion(), setClipRect(), and setClipping().

### CompositionMode QPainter::compositionMode () const

Resturns the current composition mode.

See also QPainter::CompositionMode and setCompositionMode().

### QPaintDevice * QPainter::device () const

Returns the paint device on which this painter is currently painting, or 0 if the painter is not active.

See also QPaintDevice::paintingActive().

### const QMatrix & QPainter::deviceMatrix () const

Returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paintdevice.

This function is ONLY needed when using platform painting commands on the platform dependent handle, and the platform does not do transformations nativly.

See also matrix() and QPaintEngine::hasFeature().

### void QPainter::drawArc ( const QRectF & r, int a, int alen )

Draws an arc defined by the rectangle r, the start angle a and the arc length alen.

The angles a and alen are 1/16th of a degree, i.e. a full circle equals 5760 (16*360). Positive values of a and alen mean counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

Example:

        QPainter painter(this);
        painter.drawArc(10, 10, 70, 100, 100 * 16, 160 * 16); // draws a "(" arc

See also drawPie() and drawChord().

### void QPainter::drawArc ( const QRect & r, int startAngle, int spanAngle )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the arc that fits inside the rectangle r, with the given startAngle and spanAngle.

### void QPainter::drawArc ( int x, int y, int w, int h, int startAngle, int spanAngle )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the arc that fits inside the rectangle (x, y, w, h), with the given startAngle and spanAngle.

### void QPainter::drawChord ( const QRectF & r, int a, int alen )

Draws a chord defined by the rectangle r, the start angle a and the arc length alen.

The chord is filled with the current brush().

The angles a and alen are 1/16th of a degree, i.e. a full circle equals 5760 (16*360). Positive values of a and alen mean counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

        QPainter painter(this);
        painter.drawChord(10, 10, 70, 100, 50 * 16, 150 * 16);

See also drawArc() and drawPie().

### void QPainter::drawChord ( const QRect & r, int startAngle, int spanAngle )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a chord that fits inside the rectangle r with the given startAngle and spanAngle.

### void QPainter::drawChord ( int x, int y, int w, int h, int startAngle, int spanAngle )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a chord that fits inside the rectangle (x, y, w, h) with the given startAngle and spanAngle.

### void QPainter::drawConvexPolygon ( const QPointF * points, int pointCount )

Draws the convex polygon defined by the first pointCount points in the array points using the current pen and brush.

If the supplied polygon is not convex, the results are undefined.

On some platforms (e.g. X11), drawing convex polygons can be faster than drawPolygon().

See also drawPolygon().

### void QPainter::drawConvexPolygon ( const QPoint * points, int pointCount )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the convex polygon defined by the first pointCount points in the array points using the current pen and brush.

If the supplied polygon is not convex, the results are undefined.

On some platforms (e.g. X11), drawing convex polygons can be faster than drawPolygon().

See also drawPolygon().

### void QPainter::drawConvexPolygon ( const QPolygonF & polygon )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the convex polygon defined by polygon using the current pen and brush.

### void QPainter::drawConvexPolygon ( const QPolygon & polygon )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the convex polygon defined by polygon using the current pen and brush.

### void QPainter::drawEllipse ( const QRectF & r )

Draws the ellipse that fits inside the rectangle r.

A filled ellipse has a size of r.size(). An stroked ellipse has a size of r.size() plus the pen width.

        QPainter painter(this);
        painter.drawEllipse(10, 10, 70, 100);

### void QPainter::drawEllipse ( const QRect & r )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws an ellipse that fits inside the rectangle r.

### void QPainter::drawEllipse ( int x, int y, int w, int h )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws an ellipse that fits inside the rectangle (x, y, w, h).

### void QPainter::drawImage ( const QRectF & targetRect, const QImage & image, const QRectF & sourceRect, Qt::ImageConversionFlags flags = Qt::AutoColor )

Draws the rectanglular portion sourceRect, of image image, into rectangle targetRect in the paint device.

If the image needs to be modified to fit in a lower-resolution result (e.g. converting from 32-bit to 8-bit), use the flags to specify how you would prefer this to happen.

See also drawPixmap().

### void QPainter::drawImage ( const QPointF & p, const QImage & image, const QRectF & sr, Qt::ImageConversionFlags flags = Qt::AutoColor )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the rectangle sr of image image with its origin at point p.

If the image needs to be modified to fit in a lower-resolution result (e.g. converting from 32-bit to 8-bit), use the flags to specify how you would prefer this to happen.

See also drawPixmap().

### void QPainter::drawImage ( const QRectF & rectangle, const QImage & image )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws image into rectangle.

See also drawPixmap().

### void QPainter::drawImage ( const QPoint & p, const QImage & image )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the image image at point p.

See also drawPixmap().

### void QPainter::drawImage ( const QPointF & p, const QImage & image )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the image image at point p.

See also drawPixmap().

### void QPainter::drawImage ( const QPoint & p, const QImage & image, const QRect & sr, Qt::ImageConversionFlags flags = Qt::AutoColor )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the rectangle sr of image image with its origin at point p.

See also drawPixmap().

### void QPainter::drawImage ( const QRect & rectangle, const QImage & image )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws image into rectangle.

See also drawPixmap().

### void QPainter::drawImage ( int x, int y, const QImage & image, int sx = 0, int sy = 0, int sw = -1, int sh = -1, Qt::ImageConversionFlags flags = Qt::AutoColor )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws an image at (x, y) by copying a part of image into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in image that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the image that is to be drawn. The default, (-1, -1), means all the way to the bottom-right of the image.

See also drawPixmap().

### void QPainter::drawImage ( const QRect & targetRect, const QImage & image, const QRect & sourceRect, Qt::ImageConversionFlags flags = Qt::AutoColor )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

### void QPainter::drawLine ( const QLineF & line )

Draws a line defined by line.

See also pen().

### void QPainter::drawLine ( int x1, int y1, int x2, int y2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a line from (x1, y1) to (x2, y2) and sets the current pen position to (x2, y2).

### void QPainter::drawLine ( const QPoint & p1, const QPoint & p2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a line from p1 to p2.

### void QPainter::drawLine ( const QPointF & p1, const QPointF & p2 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a line from p1 to p2.

### void QPainter::drawLine ( const QLine & line )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

See also pen().

### void QPainter::drawLines ( const QLineF * lines, int lineCount )

Draws the first lineCount lines in the array lines using the current pen.

### void QPainter::drawLines ( const QVector<QLineF> & lines )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the set of lines defined by the list lines using the current pen and brush.

### void QPainter::drawLines ( const QLine * lines, int lineCount )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the first lineCount lines in the array lines using the current pen.

### void QPainter::drawLines ( const QVector<QLine> & lines )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the set of lines defined by the list lines using the current pen and brush.

### void QPainter::drawLines ( const QVector<QPoint> & pointPairs )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the set of lines defined by the vector of points specified by pointPairs using the current pen and brush.

### void QPainter::drawLines ( const QVector<QPointF> & pointPairs )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a line for each pair of points in the vector pointPairs using the current pen.

If there is an odd number of points in the array, the last point will be ignored.

### void QPainter::drawLines ( const QPointF * pointPairs, int lineCount )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the first lineCount lines in the array pointPairs using the current pen.

The lines are specified as pairs of points so the number of entries in pointPairs must be at least lineCount * 2

See also drawLines().

### void QPainter::drawLines ( const QPoint * pointPairs, int lineCount )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the first lineCount lines in the array pointPairs using the current pen.

The lines are specified as pairs of points so the number of entries in pointPairs must be at least lineCount * 2

See also drawLines().

### void QPainter::drawPath ( const QPainterPath & path )

Draws the painter path specified by path using the current pen for outline and the current brush for filling.

### void QPainter::drawPicture ( const QPointF & p, const QPicture & picture )

Replays the picture picture at point p.

This function does exactly the same as QPicture::play() when called with p = QPoint(0, 0).

### void QPainter::drawPicture ( int x, int y, const QPicture & picture )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws picture picture at point (x, y).

### void QPainter::drawPicture ( const QPoint & p, const QPicture & picture )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws picture picture at point p.

### void QPainter::drawPie ( const QRectF & r, int a, int alen )

Draws a pie defined by the rectangle r, the start angle a and the arc length alen.

The pie is filled with the current brush().

The angles a and alen are 1/16th of a degree, i.e. a full circle equals 5760 (16*360). Positive values of a and alen mean counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

        QPainter painter(this);
        painter.drawPie(10, 10, 70, 100, 50 * 16, 100 * 16);

See also drawArc() and drawChord().

### void QPainter::drawPie ( const QRect & rect, int startAngle, int spanAngle )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a pie segment that fits inside the rectangle rect with the given startAngle and spanAngle.

### void QPainter::drawPie ( int x, int y, int w, int h, int startAngle, int spanAngle )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a pie segment that fits inside the rectangle (x, y, w, h) with the given startAngle and spanAngle.

### void QPainter::drawPixmap ( const QRectF & r, const QPixmap & pm, const QRectF & sr )

Draws the rectanglular portion sr, of pixmap pm, into rectangle r in the paint device.

See also drawImage().

### void QPainter::drawPixmap ( const QRect & targetRect, const QPixmap & pixmap, const QRect & sourceRect )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the rectangular portion sourceRect of the pixmap pixmap in the rectangle targetRect.

See also drawImage().

### void QPainter::drawPixmap ( const QPointF & p, const QPixmap & pixmap, const QRectF & sourceRect )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the rectangular portion sourceRect of the pixmap pixmap at the point p.

See also drawImage().

### void QPainter::drawPixmap ( const QPointF & p, const QPixmap & pixmap )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the pixmap at the point p.

See also drawImage().

### void QPainter::drawPixmap ( int x, int y, const QPixmap & pixmap )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the given pixmap at position (x, y).

See also drawImage().

### void QPainter::drawPixmap ( int x, int y, int width, int height, const QPixmap & pixmap )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the pixmap in the rectangle at position (x, y) and of the given width and height.

See also drawImage().

### void QPainter::drawPixmap ( int x, int y, int w, int h, const QPixmap & pm, int sx, int sy, int sw, int sh )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the pixmap pm, at the point (x, y), with a width of w and a height of h.

See also drawImage().

### void QPainter::drawPixmap ( int x, int y, const QPixmap & pixmap, int sx, int sy, int sw, int sh )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a pixmap at (x, y) by copying a part of pixmap into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in pixmap that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the pixmap that is to be drawn. The default, (-1, -1), means all the way to the bottom-right of the pixmap.

See also QPixmap::setMask() and drawImage().

### void QPainter::drawPixmap ( const QPoint & p, const QPixmap & pm, const QRect & sr )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the rectangle sr of pixmap pm with its origin at point p.

See also drawImage().

### void QPainter::drawPixmap ( const QPoint & p, const QPixmap & pm )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the pixmap pm with its origin at point p.

See also drawImage().

### void QPainter::drawPixmap ( const QRect & r, const QPixmap & pm )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the pixmap pm into the rectangle r.

See also drawImage().

### void QPainter::drawPoint ( const QPointF & p )

Draws a single point at position p using the current pen's color.

See also QPen.

### void QPainter::drawPoint ( const QPoint & p )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a single point at position p using the current pen's color.

See also QPen.

### void QPainter::drawPoint ( int x, int y )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a single point at position (x, y).

### void QPainter::drawPoints ( const QPointF * points, int pointCount )

Draws the first pointCount points in the array points using the current pen's color.

See also QPen.

### void QPainter::drawPoints ( const QPolygonF & points )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the points in the list points.

### void QPainter::drawPoints ( const QPoint * points, int pointCount )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the first pointCount points in the array points using the current pen's color.

See also QPen.

### void QPainter::drawPoints ( const QPolygon & points )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the points in the polygon points using the current pen's color.

### void QPainter::drawPolygon ( const QPointF * points, int pointCount, Qt::FillRule fillRule = Qt::OddEvenFill )

Draws the polygon defined by the first pointCount points in the array points using the current pen and brush.

The first point is implicitly connected to the last point.

The polygon is filled with the current brush(). If fillRule is Qt::WindingFill, the polygon is filled using the winding fill algorithm. If fillRule is Qt::OddEvenFill, the polygon is filled using the odd-even fill algorithm. See Qt::FillRule for a more detailed description of these fill rules.

See also drawLines(), drawPolyline(), and QPen.

### void QPainter::drawPolygon ( const QPolygon & pa, Qt::FillRule fillRule = Qt::OddEvenFill )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the polygon defined by the points in pa using the fill rule fillRule.

### void QPainter::drawPolygon ( const QPolygonF & pa, Qt::FillRule fillRule = Qt::OddEvenFill )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the polygon defined by the points in pa using the fill rule fillRule.

### void QPainter::drawPolygon ( const QPoint * points, int pointCount, Qt::FillRule fillRule = Qt::OddEvenFill )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the polygon defined by the first pointCount points in the array points.

### void QPainter::drawPolyline ( const QPointF * points, int pointCount )

Draws the polyline defined by the first pointCount points in points using the current pen.

See also drawLines(), drawPolygon(), and QPen.

### void QPainter::drawPolyline ( const QPolygon & pa )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the polyline defined by pa using the current pen.

### void QPainter::drawPolyline ( const QPolygonF & pa )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the polyline defined by pa using the current pen.

### void QPainter::drawPolyline ( const QPoint * points, int pointCount )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the polyline defined by the first pointCount points in the array points using the current pen.

### void QPainter::drawRect ( const QRectF & r )

Draws the rectangle r with the current pen and brush.

A filled rectangle has a size of r.size(). A stroked rectangle has a size of r.size() plus the pen width.

### void QPainter::drawRect ( int x, int y, int w, int h )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a rectangle with upper left corner at (x, y) and with width w and height h.

### void QPainter::drawRect ( const QRect & rect )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the rectangle rect with the current pen and brush.

### void QPainter::drawRects ( const QRectF * rects, int rectCount )

Draws the first rectCount rectangles in the array rects using the current pen and brush.

See also drawRect().

### void QPainter::drawRects ( const QVector<QRectF> & rectangles )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the rectangles specified in rectangles using the current pen and brush.

### void QPainter::drawRects ( const QRect * rects, int rectCount )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the first rectCount rectangles in the array rects using the current pen and brush.

See also drawRect().

### void QPainter::drawRects ( const QVector<QRect> & rectangles )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the rectangles specified in rectangles using the current pen and brush.

### void QPainter::drawRoundRect ( const QRectF & r, int xRnd = 25, int yRnd = 25 )

Draws a rectangle r with rounded corners.

The xRnd and yRnd arguments specify how rounded the corners should be. 0 is angled corners, 99 is maximum roundedness.

A filled rectangle has a size of r.size(). A stroked rectangle has a size of r.size() plus the pen width.

See also drawRect() and QPen.

### void QPainter::drawRoundRect ( int x, int y, int w, int h, int xRnd = 25, int yRnd = 25 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the rectangle x, y, w, h with rounded corners.

### void QPainter::drawRoundRect ( const QRect & r, int xRnd = 25, int yRnd = 25 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the rectangle r with rounded corners.

### void QPainter::drawText ( const QPointF & p, const QString & str )

Draws the string str with the currently defined text direction, beginning at position p.

See also Qt::LayoutDirection.

### void QPainter::drawText ( const QRectF & rectangle, const QString & text, const QTextOption & option = QTextOption() )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the given text in the rectangle specified using the option to control its positioning and orientation.

### void QPainter::drawText ( int x, int y, const QString & text )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the given text at position (x, y), using the painter's text layout direction.

See also layoutDirection() and setLayoutDirection().

### void QPainter::drawText ( int x, int y, int w, int h, int flags, const QString & text, QRect * br = 0 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the given text within the rectangle with origin (x, y), width w and height h. The flags that are given in the flags parameter are a selection of flags from Qt::AlignmentFlags and Qt::TextFlags combined using the bitwise OR operator. br (if not null) is set to the actual bounding rectangle of the output.

### void QPainter::drawText ( const QRect & r, int flags, const QString & str, QRect * br = 0 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the string str within the rectangle r. The flags that are given in the flags parameter are a selection of flags from Qt::AlignmentFlags and Qt::TextFlags combined using the bitwise OR operator. br (if not null) is set to the actual bounding rectangle of the output.

### void QPainter::drawText ( const QPoint & p, const QString & s )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the string s at position p, using the painter's layout direction.

See also layoutDirection() and setLayoutDirection().

### void QPainter::drawText ( const QRectF & r, int flags, const QString & str, QRectF * br = 0 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws the string str within the rectangle r. The specified flags are constructed from Qt::AlignmentFlags and Qt::TextFlags, combined using the bitwise OR operator. If br is not null, it is set to the actual bounding rectangle of the output.

### void QPainter::drawTiledPixmap ( int x, int y, int w, int h, const QPixmap & pixmap, int sx = 0, int sy = 0 )

Draws a tiled pixmap in the specified rectangle.

(x, y) specifies the top-left point in the paint device that is to be drawn onto; with the width and height given by w and h. (sx, sy) specifies the top-left point in the pixmap that is to be drawn; this defaults to (0, 0).

Calling drawTiledPixmap() is similar to calling drawPixmap() several times to fill (tile) an area with a pixmap, but is potentially much more efficient depending on the underlying window system.

See also drawPixmap().

### void QPainter::drawTiledPixmap ( const QRect & rect, const QPixmap & pixmap, const QPoint & sp = QPoint() )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a tiled pixmap, inside rectangle rect with its origin at point sp.

### void QPainter::drawTiledPixmap ( const QRectF & r, const QPixmap & pixmap, const QPointF & sp = QPointF() )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Draws a tiled pixmap, inside rectangle r with its origin at point sp.

### bool QPainter::end ()

Ends painting. Any resources used while painting are released. You don't normally need to call this since it is called by the destructor.

See also begin() and isActive().

### void QPainter::eraseRect ( const QRectF & r )

Erases the area inside the rectangle r. Equivalent to `fillRect(r, backgroundColor())`.

### void QPainter::eraseRect ( const QRect & rect )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Erases the area inside the rectangle rect. Equivalent to `fillRect(rect, backgroundColor())`.

### void QPainter::eraseRect ( int x, int y, int w, int h )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Erases the area inside x, y, w, h. Equivalent to `fillRect(x, y, w, h, backgroundColor())`.

### void QPainter::fillPath ( const QPainterPath & path, const QBrush & brush )

Fills the path path using the given brush. The outline is not drawn.

### void QPainter::fillRect ( const QRectF & r, const QBrush & brush )

Fills the rectangle r with the brush.

You can specify a QColor as brush, since there is a QBrush constructor that takes a QColor argument and creates a solid pattern brush.

See also drawRect().

### void QPainter::fillRect ( const QRect & rect, const QBrush & brush )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Fills the rectangle rect with the brush.

You can specify a QColor as brush, since there is a QBrush constructor that takes a QColor argument and creates a solid pattern brush.

See also drawRect().

### void QPainter::fillRect ( int x, int y, int w, int h, const QBrush & brush )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Fills the rectangle (x, y, w, h) with the brush.

You can specify a QColor as brush, since there is a QBrush constructor that takes a QColor argument and creates a solid pattern brush.

See also drawRect().

### const QFont & QPainter::font () const

Returns the currently set painter font.

See also setFont() and QFont.

### QFontInfo QPainter::fontInfo () const

If the painter is active, returns the font info for the painter. If the painter is not active, the return value is undefined.

See also fontMetrics() and isActive().

### QFontMetrics QPainter::fontMetrics () const

If the painter is active, returns the font metrics for the painter. If the painter is not active, the return value is undefined.

See also fontInfo() and isActive().

### bool QPainter::hasClipping () const

Returns true if clipping has been set; otherwise returns false.

See also setClipping().

### void QPainter::initFrom ( const QWidget * widget )

Initializes the painters pen, background and font to the same as widget. To be called after begin() while the painter is active.

### bool QPainter::isActive () const

Returns true if the painter is active painting, i.e. begin() has been called and end() has not yet been called; otherwise returns false.

See also QPaintDevice::paintingActive().

### Qt::LayoutDirection QPainter::layoutDirection () const

Returns the layout direction used by the painter when drawing text.

See also setLayoutDirection().

### const QMatrix & QPainter::matrix () const

Returns the world transformation matrix.

See also setMatrix().

### bool QPainter::matrixEnabled () const

Returns true if world transformation is enabled; otherwise returns false.

See also setMatrixEnabled() and setMatrix().

### QPaintEngine * QPainter::paintEngine () const

If the painter is active, returns the paint engine that the painter is currently operating on; otherwise 0.

### const QPen & QPainter::pen () const

Returns the painter's current pen.

See also setPen().

### RenderHints QPainter::renderHints () const

Returns a flag that specifies the rendering hints that are set for this painter.

### void QPainter::resetMatrix ()

Resets any transformations that were made using translate(), scale(), shear(), rotate(), setMatrix(), setViewport() and setWindow().

See also matrix() and setMatrix().

### void QPainter::restore ()

Restores the current painter state (pops a saved state off the stack).

See also save().

### void QPainter::rotate ( qreal a )

Rotates the coordinate system a degrees clockwise.

See also translate(), scale(), shear(), resetXForm(), setMatrix(), and xForm().

### void QPainter::save ()

Saves the current painter state (pushes the state onto a stack). A save() must be followed by a corresponding restore(). end() unwinds the stack.

See also restore().

### void QPainter::scale ( qreal sx, qreal sy )

Scales the coordinate system by (sx, sy).

See also translate(), shear(), rotate(), resetXForm(), setMatrix(), and xForm().

### void QPainter::setBackground ( const QBrush & bg )

Sets the background brush of the painter to bg.

The background brush is the brush that is filled in when drawing opaque text, stippled lines and bitmaps. The background brush has no effect in transparent background mode (which is the default).

See also background(), setBackgroundMode(), and Qt::BGMode.

### void QPainter::setBackgroundMode ( Qt::BGMode mode )

Sets the background mode of the painter to mode, which must be either Qt::TransparentMode (the default) or Qt::OpaqueMode.

Transparent mode draws stippled lines and text without setting the background pixels. Opaque mode fills these space with the current background color.

Note that in order to draw a bitmap or pixmap transparently, you must use QPixmap::setMask().

See also backgroundMode() and setBackground().

### void QPainter::setBrush ( Qt::BrushStyle style )

Sets the painter's brush to black color and the specified style.

See also brush() and QBrush.

### void QPainter::setBrush ( const QBrush & brush )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the painter's brush to brush.

The brush defines how shapes are filled.

See also brush().

### void QPainter::setBrushOrigin ( const QPointF & p )

Sets the brush origin to p.

The brush origin specifies the (0, 0) coordinate of the painter's brush. This setting only applies to pattern brushes and pixmap brushes.

See also brushOrigin().

### void QPainter::setBrushOrigin ( const QPoint & p )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the brush's origin to p.

### void QPainter::setBrushOrigin ( int x, int y )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the brush's origin to point (x, y).

### void QPainter::setClipPath ( const QPainterPath & path, Qt::ClipOperation op = Qt::ReplaceClip )

Sets the clip path for the painter to path, with the clip operation op.

The clip path is specified in logical (painter) coordinates.

See also clipPath().

### void QPainter::setClipRect ( const QRect & rect, Qt::ClipOperation op = Qt::ReplaceClip )

Sets the clip region to the rectangle rect using the clip operation op. The default operation is to replace the current clip rectangle.

See also setClipRegion(), clipRegion(), and setClipping().

### void QPainter::setClipRect ( int x, int y, int w, int h, Qt::ClipOperation op = Qt::ReplaceClip )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the clip region to the rectangle x, y, w, h and enables clipping.

See also setClipRegion(), clipRegion(), and setClipping().

### void QPainter::setClipRect ( const QRectF & rect, Qt::ClipOperation op = Qt::ReplaceClip )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the clip region of the rectange rect.

### void QPainter::setClipRegion ( const QRegion & r, Qt::ClipOperation op = Qt::ReplaceClip )

Sets the clip region to r using the clip operation op. The default clip operation is to replace the current clip region.

Note that the clip region is given in logical coordinates and subject to coordinate transformation.

See also setClipRect(), clipRegion(), and setClipping().

### void QPainter::setClipping ( bool enable )

Enables clipping if enable is true, or disables clipping if enable is false.

See also hasClipping(), setClipRect(), and setClipRegion().

### void QPainter::setCompositionMode ( CompositionMode mode )

Sets the composition mode to mode.

Warning: Not all paintdevices support non default composition modes.

See also compositionMode(), QPainter::CompositionMode, and QPaintEngine::PaintEngineFeature.

### void QPainter::setFont ( const QFont & font )

Sets the painter's font to font.

This font is used by subsequent drawText() functions. The text color is the same as the pen color.

If you set a font that isn't available, Qt finds a close match. font() will return what you set using setFont() and fontInfo() returns the font actually being used (which may be the same).

See also font() and drawText().

### void QPainter::setLayoutDirection ( Qt::LayoutDirection direction )

Sets the layout direction used by the painter when drawing text to the direction specified.

See also layoutDirection().

### void QPainter::setMatrix ( const QMatrix & matrix, bool combine = false )

Sets the transformation matrix to matrix and enables transformations.

If combine is true, then matrix is combined with the current transformation matrix; otherwise matrix replaces the current transformation matrix.

If matrix is the identity matrix and combine is false, this function calls setMatrixEnabled(false). (The identity matrix is the matrix where QMatrix::m11() and QMatrix::m22() are 1.0 and the rest are 0.0.)

World transformations are applied after the view transformations (i.e. window and viewport).

The following functions can transform the coordinate system without using a QMatrix:

- translate()
- scale()
- shear()
- rotate()

They operate on the painter's worldMatrix() and are implemented like this:

        void QPainter::rotate(qreal a)
        {
            QMatrix m;
            m.rotate(a);
            setMatrix(m, true);
        }

Note that you should always have combine be true when you are drawing into a QPicture. Otherwise it may not be possible to replay the picture with additional transformations. Using translate(), scale(), etc., is safe.

For a brief overview of coordinate transformation, see the Coordinate System Overview.

See also matrix(), setMatrixEnabled(), and QMatrix.

### void QPainter::setMatrixEnabled ( bool enable )

Enables transformations if enable is true, or disables world transformations if enable is false. The world transformation matrix is not changed.

See also matrixEnabled(), setMatrix(), and matrix().

### void QPainter::setPen ( const QPen & pen )

Sets a new painter pen.

The pen defines how to draw lines and outlines, and it also defines the text color.

See also pen().

### void QPainter::setPen ( const QColor & color )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the painter's pen to have style Qt::SolidLine, width 0 and the specified color.

See also pen() and QPen.

### void QPainter::setPen ( Qt::PenStyle style )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the painter's pen to have style style, width 0 and black color.

See also pen() and QPen.

### void QPainter::setRedirected ( const QPaintDevice * device, QPaintDevice * replacement, const QPoint & offset = QPoint() ) `[static]`

Redirects all paint commands for a paint device, device, to another paint device, replacement. The optional point offset defines an offset within the source device. After painting you must call restoreRedirected().

In general, you'll probably find calling QPixmap::grabWidget() or QPixmap::grabWindow() is an easier solution.

See also redirected().

### void QPainter::setRenderHint ( RenderHint hint, bool on = true )

Sets the render hint hint on this painter if on is true; otherwise clears the render hint.

### void QPainter::setViewTransformEnabled ( bool enable )

Enables view transformations if enable is true, or disables view transformations if enable is false.

See also viewTransformEnabled(), setWindow(), setViewport(), setMatrix(), and setMatrixEnabled().

### void QPainter::setViewport ( int x, int y, int w, int h )

Sets the viewport rectangle view transformation for the painter and enables view transformation.

The viewport rectangle is part of the view transformation. The viewport specifies the device coordinate system and is specified by the x, y, w width and h height parameters. Its sister, the window(), specifies the logical coordinate system.

The default viewport rectangle is the same as the device's rectangle. See the Coordinate System Overview for an overview of coordinate transformation.

See also viewport(), setWindow(), setViewTransformEnabled(), setMatrix(), and setMatrixEnabled().

### void QPainter::setViewport ( const QRect & r )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the painter's viewport rectangle to r.

### void QPainter::setWindow ( int x, int y, int w, int h )

Sets the window rectangle view transformation for the painter and enables view transformation.

The window rectangle is part of the view transformation. The window specifies the logical coordinate system and is specified by the x, y, w width and h height parameters. Its sister, the viewport(), specifies the device coordinate system.

The default window rectangle is the same as the device's rectangle. See the Coordinate System Overview for an overview of coordinate transformation.

See also window(), setViewport(), setViewTransformEnabled(), setMatrix(), and setMatrixEnabled().

### void QPainter::setWindow ( const QRect & r )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Sets the painter's window to the rectangle r.

### void QPainter::shear ( qreal sh, qreal sv )

Shears the coordinate system by (sh, sv).

See also translate(), scale(), rotate(), resetXForm(), setMatrix(), and xForm().

### void QPainter::strokePath ( const QPainterPath & path, const QPen & pen )

Draws the outline (strokes) the path path with the pen specified by pen

### void QPainter::translate ( const QPointF & offset )

Translates the coordinate system by offset. After this call, offset is added to points.

For example, the following code draws the same point twice:

        void MyWidget::paintEvent()
        {
            QPainter paint(this);

            paint.drawPoint(0, 0);

            paint.translate(100.0, 40.0);
            paint.drawPoint(-100, -40);
        }

See also scale(), shear(), rotate(), resetXForm(), setMatrix(), and xForm().

### void QPainter::translate ( qreal dx, qreal dy )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Translates the coordinate system by the vector (dx, dy).

### void QPainter::translate ( const QPoint & offset )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Translates the coordinate system by the given offset.

### bool QPainter::viewTransformEnabled () const

Returns true if view transformation is enabled; otherwise returns false.

See also setViewTransformEnabled() and matrix().

### QRect QPainter::viewport () const

Returns the viewport rectangle.

See also setViewport() and setViewTransformEnabled().

### QRect QPainter::window () const

Returns the window rectangle.

See also setWindow() and setViewTransformEnabled().

## Related Non-Members

### void qDrawPlainRect ( QPainter * p, int x, int y, int w, int h, const QColor & c, int lineWidth = 1, const QBrush * fill = 0 )

`#include <qdrawutil.h>`

Draws the plain rectangle specified by (x, y, w, h) using the painter p.

The color argument c specifies the line color.

The lineWidth argument specifies the line width.

The rectangle's interior is filled with the fill brush unless fill is 0.

If you want to use a QFrame widget instead, you can make it display a plain rectangle, for example `QFrame::setFrameStyle( QFrame::Box | QFrame::Plain)`.

Warning: This function does not look at QWidget::style() or QApplication::style()-> Use the drawing functions in QStyle to make widgets that follow the current GUI style.

See also qDrawShadeRect() and QStyle::drawPrimitive().

### void qDrawShadeLine ( QPainter * p, int x1, int y1, int x2, int y2, const QPalette & pal, bool sunken = true, int lineWidth = 1, int midLineWidth = 0 )

`#include <qdrawutil.h>`

Draws a horizontal (y1 == y2) or vertical (x1 == x2) shaded line using the painter p.

Nothing is drawn if y1 != y2 and x1 != x2 (i.e. the line is neither horizontal nor vertical).

The palette pal specifies the shading colors (light, dark and middle colors).

The line appears sunken if sunken is true, or raised if sunken is false.

The lineWidth argument specifies the line width for each of the lines. It is not the total line width.

The midLineWidth argument specifies the width of a middle line drawn in the QPalette::mid() color.

If you want to use a QFrame widget instead, you can make it display a shaded line, for example `QFrame::setFrameStyle( QFrame::HLine | QFrame::Sunken)`.

Warning: This function does not look at QWidget::style() or QApplication::style()-> Use the drawing functions in QStyle to make widgets that follow the current GUI style.

See also qDrawShadeRect(), qDrawShadePanel(), and QStyle::drawPrimitive().

### void qDrawShadePanel ( QPainter * p, int x, int y, int w, int h, const QPalette & pal, bool sunken = false, int lineWidth = 1, const QBrush * fill = 0 )

`#include <qdrawutil.h>`

Draws the shaded panel specified by (x, y, w, h) using the painter p.

The palette pal specifies the shading colors (light, dark and middle colors).

The panel appears sunken if sunken is true, or raised if sunken is false.

The lineWidth argument specifies the line width.

The panel's interior is filled with the fill brush unless fill is 0.

If you want to use a QFrame widget instead, you can make it display a shaded panel, for example `QFrame::setFrameStyle( QFrame::Panel | QFrame::Sunken)`.

Warning: This function does not look at QWidget::style() or QApplication::style()-> Use the drawing functions in QStyle to make widgets that follow the current GUI style.

See also qDrawWinPanel(), qDrawShadeLine(), qDrawShadeRect(), and QStyle::drawPrimitive().

### void qDrawShadeRect ( QPainter * p, int x, int y, int w, int h, const QPalette & pal, bool sunken = false, int lineWidth = 1, int midLineWidth = 0, const QBrush * fill = 0 )

`#include <qdrawutil.h>`

Draws the shaded rectangle specified by (x, y, w, h) using the painter p.

The paletted pal specifies the shading colors (light, dark and middle colors).

The rectangle appears sunken if sunken is true, or raised if sunken is false.

The lineWidth argument specifies the line width for each of the lines. It is not the total line width.

The midLineWidth argument specifies the width of a middle line drawn in the QPalette::mid() color.

The rectangle's interior is filled with the fill brush unless fill is 0.

If you want to use a QFrame widget instead, you can make it display a shaded rectangle, for example `QFrame::setFrameStyle( QFrame::Box | QFrame::Raised)`.

Warning: This function does not look at QWidget::style() or QApplication::style()-> Use the drawing functions in QStyle to make widgets that follow the current GUI style.

See also qDrawShadeLine(), qDrawShadePanel(), qDrawPlainRect(), QStyle::drawItemText(), QStyle::drawItemPixmap(), QStyle::drawControl(), and QStyle::drawComplexControl().

### void qDrawWinButton ( QPainter * p, int x, int y, int w, int h, const QPalette & pal, bool sunken = false, const QBrush * fill = 0 )

`#include <qdrawutil.h>`

Draws the Windows-style button specified by (x, y, w, h) using the painter p.

The palette pal specifies the shading colors (light, dark and middle colors).

The button appears sunken if sunken is true, or raised if sunken is false.

The line width is 2 pixels.

The button's interior is filled with the `*`fill brush unless fill is 0.

Warning: This function does not look at QWidget::style() or QApplication::style()-> Use the drawing functions in QStyle to make widgets that follow the current GUI style.

See also qDrawWinPanel() and QStyle::drawControl().

### void qDrawWinPanel ( QPainter * p, int x, int y, int w, int h, const QPalette & pal, bool sunken = false, const QBrush * fill = 0 )

`#include <qdrawutil.h>`

Draws the Windows-style panel specified by (x, y, w, h) using the painter p.

The palette pal specifies the shading colors.

The panel appears sunken if sunken is true, or raised if sunken is false.

The line width is 2 pixels.

The button's interior is filled with the fill brush unless fill is 0.

If you want to use a QFrame widget instead, you can make it display a shaded panel, for example `QFrame::setFrameStyle( QFrame::WinPanel | QFrame::Raised)`.

Warning: This function does not look at QWidget::style() or QApplication::style()-> Use the drawing functions in QStyle to make widgets that follow the current GUI style.

See also qDrawShadePanel(), qDrawWinButton(), and QStyle::drawPrimitive().