QwtPainter - A collection of QPainter workarounds.

NAME

QwtPainter − A collection of QPainter workarounds.

static void setPolylineSplitting (bool)
En/Disable line splitting for the raster paint engine.
static bool polylineSplitting ()
static void setRoundingAlignment (bool)
static bool roundingAlignment ()
static bool roundingAlignment (const QPainter *)
static void drawText (QPainter *, qreal x, qreal y, const QString &)
Wrapper for QPainter::drawText()
static void drawText (QPainter *, const QPointF &, const QString &)
Wrapper for QPainter::drawText()
static void drawText (QPainter *, qreal x, qreal y, qreal w, qreal h, int flags, const QString &)
Wrapper for QPainter::drawText()
static void drawText (QPainter *, const QRectF &, int flags, const QString &)
Wrapper for QPainter::drawText()
static void drawSimpleRichText (QPainter *, const QRectF &, int flags, const QTextDocument &)
static void drawRect (QPainter *, qreal x, qreal y, qreal w, qreal h)
Wrapper for QPainter::drawRect()
static void drawRect (QPainter *, const QRectF &rect)
Wrapper for QPainter::drawRect()
static void fillRect (QPainter *, const QRectF &, const QBrush &)
Wrapper for QPainter::fillRect()
static void drawEllipse (QPainter *, const QRectF &)
Wrapper for QPainter::drawEllipse()
static void drawPie (QPainter *, const QRectF &r, int a, int alen)
Wrapper for QPainter::drawPie()
static void drawLine (QPainter *, qreal x1, qreal y1, qreal x2, qreal y2)
Wrapper for QPainter::drawLine()
static void drawLine (QPainter *, const QPointF &p1, const QPointF &p2)
Wrapper for QPainter::drawLine()
static void drawLine (QPainter *, const QLineF &)
Wrapper for QPainter::drawLine()
static void drawPolygon (QPainter *, const QPolygonF &)
Wrapper for QPainter::drawPolygon()
static void drawPolyline (QPainter *, const QPolygonF &)
Wrapper for QPainter::drawPolyline()
static void drawPolyline (QPainter *, const QPointF *, int pointCount)
Wrapper for QPainter::drawPolyline()
static void drawPolygon (QPainter *, const QPolygon &)
Wrapper for QPainter::drawPolygon()
static void drawPolyline (QPainter *, const QPolygon &)
Wrapper for QPainter::drawPolyline()
static void drawPolyline (QPainter *, const QPoint *, int pointCount)
Wrapper for QPainter::drawPolyline()
static void drawPoint (QPainter *, const QPoint &)
Wrapper for QPainter::drawPoint()
static void drawPoints (QPainter *, const QPolygon &)
Wrapper for QPainter::drawPoints()
static void drawPoints (QPainter *, const QPoint *, int pointCount)
Wrapper for QPainter::drawPoints()
static void drawPoint (QPainter *, qreal x, qreal y)
Wrapper for QPainter::drawPoint()
static void drawPoint (QPainter *, const QPointF &)
Wrapper for QPainter::drawPoint()
static void drawPoints (QPainter *, const QPolygonF &)
Wrapper for QPainter::drawPoints()
static void drawPoints (QPainter *, const QPointF *, int pointCount)
Wrapper for QPainter::drawPoints()
static void drawPath (QPainter *, const QPainterPath &)
Wrapper for QPainter::drawPath()
static void drawImage (QPainter *, const QRectF &, const QImage &)
Wrapper for QPainter::drawImage()
static void drawPixmap (QPainter *, const QRectF &, const QPixmap &)
Wrapper for QPainter::drawPixmap()
static void drawRoundFrame (QPainter *, const QRectF &, const QPalette &, int lineWidth, int frameStyle)
static void drawRoundedFrame (QPainter *, const QRectF &, qreal xRadius, qreal yRadius, const QPalette &, int lineWidth, int frameStyle)
static void drawFrame (QPainter *, const QRectF &rect, const QPalette &palette, QPalette::ColorRole foregroundRole, int lineWidth, int midLineWidth, int frameStyle)
static void drawFocusRect (QPainter *, const QWidget *)
Draw a focus rectangle on a widget using its style.
static void drawFocusRect (QPainter *, const QWidget *, const QRect &)
Draw a focus rectangle on a widget using its style.
static void drawColorBar (QPainter *, const QwtColorMap &, const QwtInterval &, const QwtScaleMap &, Qt::Orientation, const QRectF &)
static bool isAligning (const QPainter *)
static bool isX11GraphicsSystem ()
static void fillPixmap (const QWidget *, QPixmap &, const QPoint &offset=QPoint())
static void drawBackgound (QPainter *, const QRectF &, const QWidget *)
static QPixmap backingStore (QWidget *, const QSize &)
static qreal devicePixelRatio (const QPaintDevice *)
static qreal effectivePenWidth (const QPen &)
static int horizontalAdvance (const QFontMetrics &, const QString &)
static qreal horizontalAdvance (const QFontMetricsF &, const QString &)
static int horizontalAdvance (const QFontMetrics &, QChar)
static qreal horizontalAdvance (const QFontMetricsF &, QChar)
static QFont scaledFont (const QFont &, const QPaintDevice *=NULL)

Detailed Description

painter Painter
rect Rectangle to be filled
widget Widget

See also

QStyle::PE_Widget, QWidget::backgroundRole()

Definition at line 1341 of file qwt_painter.cpp.

void QwtPainter::drawColorBar (QPainter * painter, const QwtColorMap &colorMap, const QwtInterval & interval, const QwtScaleMap & scaleMap,Qt::Orientation orientation, const QRectF & rect) [static]

Draw a color bar into a rectangle

Parameters

painter Painter
colorMap Color map
interval Value range
scaleMap Scale map
orientation Orientation
rect Target rectangle

Definition at line 1195 of file qwt_painter.cpp.

void QwtPainter::drawEllipse (QPainter * painter, const QRectF & rect)[static]

Wrapper for QPainter::drawEllipse()

Definition at line 416 of file qwt_painter.cpp.

void QwtPainter::drawFocusRect (QPainter * painter, const QWidget * widget)[static]

Draw a focus rectangle on a widget using its style.

Definition at line 805 of file qwt_painter.cpp.

void QwtPainter::drawFocusRect (QPainter * painter, const QWidget * widget,const QRect & rect) [static]

Draw a focus rectangle on a widget using its style.

Definition at line 811 of file qwt_painter.cpp.

void QwtPainter::drawFrame (QPainter * painter, const QRectF & rect, constQPalette & palette, QPalette::ColorRole foregroundRole, int frameWidth,int midLineWidth, int frameStyle) [static]

Draw a rectangular frame

Parameters

painter Painter
rect Frame rectangle
palette Palette
foregroundRole Foreground role used for QFrame::Plain
frameWidth Frame width
midLineWidth Used for QFrame::Box
frameStyle bitwise ORÂ´ed value of QFrame::Shape and QFrame::Shadow

Definition at line 901 of file qwt_painter.cpp.

void QwtPainter::drawImage (QPainter * painter, const QRectF & rect, constQImage & image) [static]

Wrapper for QPainter::drawImage()

Definition at line 763 of file qwt_painter.cpp.

void QwtPainter::drawLine (QPainter * painter, const QLineF & line)[inline], [static]

Wrapper for QPainter::drawLine()

Definition at line 161 of file qwt_painter.h.

void QwtPainter::drawLine (QPainter * painter, const QPointF & p1, constQPointF & p2) [static]

Wrapper for QPainter::drawLine()

Definition at line 531 of file qwt_painter.cpp.

void QwtPainter::drawLine (QPainter * painter, qreal x1, qreal y1, qrealx2, qreal y2) [inline], [static]

Wrapper for QPainter::drawLine()

Definition at line 154 of file qwt_painter.h.

void QwtPainter::drawPath (QPainter * painter, const QPainterPath & path)[static]

Wrapper for QPainter::drawPath()

Definition at line 331 of file qwt_painter.cpp.

void QwtPainter::drawPie (QPainter * painter, const QRectF & r, int a, intalen) [static]

Wrapper for QPainter::drawPie()

Definition at line 404 of file qwt_painter.cpp.

void QwtPainter::drawPixmap (QPainter * painter, const QRectF & rect, constQPixmap & pixmap) [static]

Wrapper for QPainter::drawPixmap()

Definition at line 784 of file qwt_painter.cpp.

void QwtPainter::drawPoint (QPainter * painter, const QPoint & pos)[static]

Wrapper for QPainter::drawPoint()

Definition at line 681 of file qwt_painter.cpp.

void QwtPainter::drawPoint (QPainter * painter, const QPointF & pos)[static]

Wrapper for QPainter::drawPoint()

Definition at line 669 of file qwt_painter.cpp.

void QwtPainter::drawPoint (QPainter * painter, qreal x, qreal y) [inline],[static]

Wrapper for QPainter::drawPoint()

Definition at line 136 of file qwt_painter.h.

void QwtPainter::drawPoints (QPainter * painter, const QPoint * points, intpointCount) [static]

Wrapper for QPainter::drawPoints()

Definition at line 704 of file qwt_painter.cpp.

void QwtPainter::drawPoints (QPainter * painter, const QPointF * points,int pointCount) [static]

Wrapper for QPainter::drawPoints()

Definition at line 737 of file qwt_painter.cpp.

void QwtPainter::drawPoints (QPainter * painter, const QPolygon & polygon)[inline], [static]

Wrapper for QPainter::drawPoints()

Definition at line 142 of file qwt_painter.h.

void QwtPainter::drawPoints (QPainter * painter, const QPolygonF & polygon)[inline], [static]

Wrapper for QPainter::drawPoints()

Definition at line 148 of file qwt_painter.h.

void QwtPainter::drawPolygon (QPainter * painter, const QPolygon & polygon)[static]

Wrapper for QPainter::drawPolygon()

Definition at line 610 of file qwt_painter.cpp.

void QwtPainter::drawPolygon (QPainter * painter, const QPolygonF &polygon) [static]

Wrapper for QPainter::drawPolygon()

Definition at line 551 of file qwt_painter.cpp.

void QwtPainter::drawPolyline (QPainter * painter, const QPoint * points,int pointCount) [static]

Wrapper for QPainter::drawPolyline()

Definition at line 647 of file qwt_painter.cpp.

void QwtPainter::drawPolyline (QPainter * painter, const QPointF * points,int pointCount) [static]

Wrapper for QPainter::drawPolyline()

Definition at line 588 of file qwt_painter.cpp.

void QwtPainter::drawPolyline (QPainter * painter, const QPolygon &polygon) [static]

Wrapper for QPainter::drawPolyline()

Definition at line 627 of file qwt_painter.cpp.

void QwtPainter::drawPolyline (QPainter * painter, const QPolygonF &polygon) [static]

Wrapper for QPainter::drawPolyline()

Definition at line 568 of file qwt_painter.cpp.

void QwtPainter::drawRect (QPainter * painter, const QRectF & rect)[static]

Wrapper for QPainter::drawRect()

Definition at line 343 of file qwt_painter.cpp.

void QwtPainter::drawRect (QPainter * painter, qreal x, qreal y, qreal w,qreal h) [static]

Wrapper for QPainter::drawRect()

Definition at line 337 of file qwt_painter.cpp.

void QwtPainter::drawRoundedFrame (QPainter * painter, const QRectF & rect,qreal xRadius, qreal yRadius, const QPalette & palette, int lineWidth,int frameStyle) [static]

Draw a rectangular frame with rounded borders

Parameters

painter Painter
rect Frame rectangle
xRadius x-radius of the ellipses defining the corners
yRadius y-radius of the ellipses defining the corners
palette QPalette::WindowText is used for plain borders QPalette::Dark and QPalette::Light for raised or sunken borders
lineWidth Line width
frameStyle bitwise ORÂ´ed value of QFrame::Shape and QFrame::Shadow

Definition at line 1055 of file qwt_painter.cpp.

void QwtPainter::drawRoundFrame (QPainter * painter, const QRectF & rect,const QPalette & palette, int lineWidth, int frameStyle) [static]

Draw a round frame

Parameters

painter Painter
rect Frame rectangle
palette QPalette::WindowText is used for plain borders QPalette::Dark and QPalette::Light for raised or sunken borders
lineWidth Line width
frameStyle bitwise ORÂ´ed value of QFrame::Shape and QFrame::Shadow

Definition at line 835 of file qwt_painter.cpp.

void QwtPainter::drawSimpleRichText (QPainter * painter, const QRectF &rect, int flags, const QTextDocument & text) [static]

Check if the painter is using a paint engine, that aligns coordinates to integers. Today these are all paint engines beside QPaintEngine::Pdf and QPaintEngine::SVG.

If we have an integer based paint engine it is also checked if the painter has a transformation matrix, that rotates or scales.

Parameters

painter Painter

Returns

true, when the painter is aligning

See also

setRoundingAlignment()

Definition at line 257 of file qwt_painter.cpp.

bool QwtPainter::isX11GraphicsSystem () [static]

Check is the application is running with the X11 graphics system that has some special capabilities that can be used for incremental painting to a widget.

Returns

True, when the graphics system is X11

Definition at line 223 of file qwt_painter.cpp.

bool QwtPainter::polylineSplitting () [inline], [static]

Returns

True, when line splitting for the raster paint engine is enabled.

See also

setPolylineSplitting()

Definition at line 170 of file qwt_painter.h.

bool QwtPainter::roundingAlignment () [inline], [static]

Check whether coordinates should be rounded, before they are painted to a paint engine that rounds to integer values. For other paint engines ( PDF, SVG ), this flag has no effect.

Returns

True, when rounding is enabled

See also

setRoundingAlignment(), isAligning()

Definition at line 183 of file qwt_painter.h.

bool QwtPainter::roundingAlignment (const QPainter * painter) [inline],[static]

Returns

roundingAlignment() && isAligning(painter);

Parameters

painter Painter

Definition at line 192 of file qwt_painter.h.

QFont QwtPainter::scaledFont (const QFont & font, const QPaintDevice *paintDevice = NULL) [static]

Adjust the DPI value of font according to the DPI value of the paint device

Parameters

font Unscaled font
paintDevice Paint device providing a DPI value. If paintDevice == null the DPI value of the primary screen will be used

Returns

Font being adjusted to the DPI value of the paint device

Definition at line 1440 of file qwt_painter.cpp.

void QwtPainter::setPolylineSplitting (bool enable) [static]

En/Disable line splitting for the raster paint engine. In some Qt versions the raster paint engine paints polylines of many points much faster when they are split in smaller chunks: f.e all supported Qt versions >= Qt 5.0 when drawing an antialiased polyline with a pen width >=2.

Also the raster paint engine has a nasty bug in many versions ( Qt 4.8 - ... ) for short lines ( https://codereview.qt-project.org/#/c/99456 ), that is worked around in this mode.

The default setting is true.

See also

polylineSplitting()

Definition at line 325 of file qwt_painter.cpp.

void QwtPainter::setRoundingAlignment (bool enable) [static]

Enable whether coordinates should be rounded, before they are painted to a paint engine that floors to integer values. For other paint engines ( PDF, SVG ) this flag has no effect. QwtPainter stores this flag only, the rounding itself is done in the painting code ( f.e the plot items ).

The default setting is true.

See also

roundingAlignment(), isAligning()

Definition at line 305 of file qwt_painter.cpp.

Author

Generated automatically by Doxygen for Qwt User’s Guide from the source code.

Updated 2026-06-01 - jenkler.se | uex.se

QwtPainter - A collection of QPainter workarounds.

NAME

SYNOPSIS

Static Public Member Functions

Detailed Description

Member Function Documentation

QPixmap QwtPainter::backingStore (QWidget * widget, const QSize & size)[static]

qreal QwtPainter::devicePixelRatio (const QPaintDevice * paintDevice)[static]

void QwtPainter::drawBackgound (QPainter * painter, const QRectF & rect,const QWidget * widget) [static]

void QwtPainter::drawColorBar (QPainter * painter, const QwtColorMap &colorMap, const QwtInterval & interval, const QwtScaleMap & scaleMap,Qt::Orientation orientation, const QRectF & rect) [static]

void QwtPainter::drawEllipse (QPainter * painter, const QRectF & rect)[static]

void QwtPainter::drawFocusRect (QPainter * painter, const QWidget * widget)[static]

void QwtPainter::drawFocusRect (QPainter * painter, const QWidget * widget,const QRect & rect) [static]

void QwtPainter::drawFrame (QPainter * painter, const QRectF & rect, constQPalette & palette, QPalette::ColorRole foregroundRole, int frameWidth,int midLineWidth, int frameStyle) [static]

void QwtPainter::drawImage (QPainter * painter, const QRectF & rect, constQImage & image) [static]

void QwtPainter::drawLine (QPainter * painter, const QLineF & line)[inline], [static]

void QwtPainter::drawLine (QPainter * painter, const QPointF & p1, constQPointF & p2) [static]

void QwtPainter::drawLine (QPainter * painter, qreal x1, qreal y1, qrealx2, qreal y2) [inline], [static]

void QwtPainter::drawPath (QPainter * painter, const QPainterPath & path)[static]

void QwtPainter::drawPie (QPainter * painter, const QRectF & r, int a, intalen) [static]

void QwtPainter::drawPixmap (QPainter * painter, const QRectF & rect, constQPixmap & pixmap) [static]

void QwtPainter::drawPoint (QPainter * painter, const QPoint & pos)[static]

void QwtPainter::drawPoint (QPainter * painter, const QPointF & pos)[static]

void QwtPainter::drawPoint (QPainter * painter, qreal x, qreal y) [inline],[static]

void QwtPainter::drawPoints (QPainter * painter, const QPoint * points, intpointCount) [static]

void QwtPainter::drawPoints (QPainter * painter, const QPointF * points,int pointCount) [static]

void QwtPainter::drawPoints (QPainter * painter, const QPolygon & polygon)[inline], [static]

void QwtPainter::drawPoints (QPainter * painter, const QPolygonF & polygon)[inline], [static]

void QwtPainter::drawPolygon (QPainter * painter, const QPolygon & polygon)[static]

void QwtPainter::drawPolygon (QPainter * painter, const QPolygonF &polygon) [static]

void QwtPainter::drawPolyline (QPainter * painter, const QPoint * points,int pointCount) [static]

void QwtPainter::drawPolyline (QPainter * painter, const QPointF * points,int pointCount) [static]

void QwtPainter::drawPolyline (QPainter * painter, const QPolygon &polygon) [static]

void QwtPainter::drawPolyline (QPainter * painter, const QPolygonF &polygon) [static]

void QwtPainter::drawRect (QPainter * painter, const QRectF & rect)[static]

void QwtPainter::drawRect (QPainter * painter, qreal x, qreal y, qreal w,qreal h) [static]

void QwtPainter::drawRoundedFrame (QPainter * painter, const QRectF & rect,qreal xRadius, qreal yRadius, const QPalette & palette, int lineWidth,int frameStyle) [static]

void QwtPainter::drawRoundFrame (QPainter * painter, const QRectF & rect,const QPalette & palette, int lineWidth, int frameStyle) [static]

void QwtPainter::drawSimpleRichText (QPainter * painter, const QRectF &rect, int flags, const QTextDocument & text) [static]

void QwtPainter::drawText (QPainter * painter, const QPointF & pos, constQString & text) [static]

void QwtPainter::drawText (QPainter * painter, const QRectF & rect, intflags, const QString & text) [static]

void QwtPainter::drawText (QPainter * painter, qreal x, qreal y, constQString & text) [static]

void QwtPainter::drawText (QPainter * painter, qreal x, qreal y, qreal w,qreal h, int flags, const QString & text) [static]

qreal QwtPainter::effectivePenWidth (const QPen & pen) [inline], [static]

void QwtPainter::fillPixmap (const QWidget * widget, QPixmap & pixmap,const QPoint & offset = QPoint()) [static]

void QwtPainter::fillRect (QPainter * painter, const QRectF & rect, constQBrush & brush) [static]

int QwtPainter::horizontalAdvance (const QFontMetrics & fontMetrics, constQString & text) [static]

int QwtPainter::horizontalAdvance (const QFontMetrics & fontMetrics, QCharch) [static]

qreal QwtPainter::horizontalAdvance (const QFontMetricsF & fontMetrics,const QString & text) [static]

qreal QwtPainter::horizontalAdvance (const QFontMetricsF & fontMetrics,QChar ch) [static]

bool QwtPainter::isAligning (const QPainter * painter) [static]

bool QwtPainter::isX11GraphicsSystem () [static]

bool QwtPainter::polylineSplitting () [inline], [static]

bool QwtPainter::roundingAlignment () [inline], [static]

bool QwtPainter::roundingAlignment (const QPainter * painter) [inline],[static]

QFont QwtPainter::scaledFont (const QFont & font, const QPaintDevice *paintDevice = NULL) [static]

void QwtPainter::setPolylineSplitting (bool enable) [static]

void QwtPainter::setRoundingAlignment (bool enable) [static]

Author