QwtPainter - Man Page

A collection of QPainter workarounds.

Synopsis

#include <qwt_painter.h>

Static Public Member Functions

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 (QPainter *)
static void drawText (QPainter *, double x, double y, const QString &)
Wrapper for QPainter::drawText()
static void drawText (QPainter *, const QPointF &, const QString &)
Wrapper for QPainter::drawText()
static void drawText (QPainter *, double x, double y, double w, double 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 *, double x, double y, double w, double 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 &, int a, int alen)
Wrapper for QPainter::drawPie()
static void drawLine (QPainter *, double x1, double y1, double x2, double 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 *, double x, double 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 &, double xRadius, double yRadius, const QPalette &, int lineWidth, int frameStyle)
static void drawFrame (QPainter *, const QRectF &rect, const QPalette &palette, QPalette::ColorRole foregroundRole, int frameWidth, 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 *painter, const QwtColorMap &, const QwtInterval &, const QwtScaleMap &, Qt::Orientation, const QRectF &)
static bool isAligning (QPainter *painter)
static bool isX11GraphicsSystem ()
static void fillPixmap (const QWidget *, QPixmap &, const QPoint &offset=QPoint())
static void drawBackgound (QPainter *painter, const QRectF &rect, const QWidget *widget)
static QPixmap backingStore (QWidget *, const QSize &)

Detailed Description

A collection of QPainter workarounds.

Member Function Documentation

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

Returns

A pixmap that can be used as backing store

Parameters

widget Widget, for which the backingstore is intended
size Size of the pixmap

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

Fill rect with the background of a widget

Parameters

painter Painter
rect Rectangle to be filled
widget Widget

See also

QStyle::PE_Widget, QWidget::backgroundRole()

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 Traget rectangle

void QwtPainter::drawFrame (QPainter * painter, const QRectF & rect, const QPalette & 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 OR´ed value of QFrame::Shape and QFrame::Shadow

void QwtPainter::drawRoundedFrame (QPainter * painter, const QRectF & rect, double xRadius, double 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 OR´ed value of QFrame::Shape and QFrame::Shadow

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 OR´ed value of QFrame::Shape and QFrame::Shadow

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

Draw a text document into a rectangle

Parameters

painter Painter
rect Traget rectangle
flags Alignments/Text flags, see QPainter::drawText()
text Text document

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

Fill a pixmap with the content of a widget

In Qt >= 5.0 QPixmap::fill() is a nop, in Qt 4.x it is buggy for backgrounds with gradients. Thus fillPixmap() offers an alternative implementation.

Parameters

widget Widget
pixmap Pixmap to be filled
offset Offset

See also

QPixmap::fill()

bool QwtPainter::isAligning (QPainter * painter) [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()

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

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

Returns

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

See also

setPolylineSplitting()

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()

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

Returns

roundingAlignment() && isAligning(painter);

Parameters

painter Painter

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()

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()

Author

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

Info

Mon Jun 1 2020 Version 6.1.5 Qwt User's Guide