QwtPainter (3) - Linux Man Pages

NAME

QwtPainter -

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 &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:

widget Widget, for which the backinstore 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::Orientationorientation, 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::ColorRoleforegroundRole, intframeWidth, intmidLineWidth, intframeStyle) [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, doublexRadius, doubleyRadius, const QPalette &palette, intlineWidth, intframeStyle) [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, intlineWidth, intframeStyle) [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, intflags, 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 (boolenable) [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 (boolenable) [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()

Author

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