Qwt User's Guide  6.1.1
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Static Public Member Functions | List of all members
QwtPainter Class Reference

A collection of QPainter workarounds. More...

#include <qwt_painter.h>

Static Public Member Functions

static void setPolylineSplitting (bool)
 En/Disable line splitting for the raster paint engine. More...
 
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 &r, 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 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 *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
widgetWidget, for which the backinstore is intended
sizeSize of the pixmap
void QwtPainter::drawBackgound ( QPainter *  painter,
const QRectF &  rect,
const QWidget *  widget 
)
static

Fill rect with the background of a widget

Parameters
painterPainter
rectRectangle to be filled
widgetWidget
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
painterPainter
colorMapColor map
intervalValue range
scaleMapScale map
orientationOrientation
rectTraget 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
painterPainter
rectFrame rectangle
palettePalette
foregroundRoleForeground role used for QFrame::Plain
frameWidthFrame width
midLineWidthUsed for QFrame::Box
frameStylebitwise 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
painterPainter
rectFrame rectangle
xRadiusx-radius of the ellipses defining the corners
yRadiusy-radius of the ellipses defining the corners
paletteQPalette::WindowText is used for plain borders QPalette::Dark and QPalette::Light for raised or sunken borders
lineWidthLine width
frameStylebitwise 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
painterPainter
rectFrame rectangle
paletteQPalette::WindowText is used for plain borders QPalette::Dark and QPalette::Light for raised or sunken borders
lineWidthLine width
frameStylebitwise 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
painterPainter
rectTraget rectangle
flagsAlignments/Text flags, see QPainter::drawText()
textText 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
widgetWidget
pixmapPixmap to be filled
offsetOffset
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
painterPainter
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 ( )
inlinestatic
Returns
True, when line splitting for the raster paint engine is enabled.
See Also
setPolylineSplitting()
bool QwtPainter::roundingAlignment ( )
inlinestatic

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)
inlinestatic
Returns
roundingAlignment() && isAligning(painter);
Parameters
painterPainter
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.

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 this ( 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()