Provided by: libqwt-doc_6.0.0-1.2_all 
NAME
QwtPlotRenderer -
Renderer for exporting a plot to a document, a printer or anything else, that is supported
by QPainter/QPaintDevice.
SYNOPSIS
#include <qwt_plot_renderer.h>
Public Types
enum DiscardFlag { DiscardNone = 0x00, DiscardBackground = 0x01, DiscardTitle = 0x02,
DiscardLegend = 0x04, DiscardCanvasBackground = 0x08 }
enum LayoutFlag { DefaultLayout = 0x00, KeepFrames = 0x01, FrameWithScales = 0x02 }
typedef QFlags< DiscardFlag > DiscardFlags
typedef QFlags< LayoutFlag > LayoutFlags
Public Member Functions
QwtPlotRenderer (QObject *=NULL)
virtual ~QwtPlotRenderer ()
void setDiscardFlag (DiscardFlag flag, bool on=true)
bool testDiscardFlag (DiscardFlag flag) const
void setDiscardFlags (DiscardFlags flags)
DiscardFlags discardFlags () const
void setLayoutFlag (LayoutFlag flag, bool on=true)
bool testLayoutFlag (LayoutFlag flag) const
void setLayoutFlags (LayoutFlags flags)
LayoutFlags layoutFlags () const
void renderDocument (QwtPlot *, const QString &format, const QSizeF &sizeMM, int
resolution=85)
void renderDocument (QwtPlot *, const QString &title, const QString &format, const QSizeF
&sizeMM, int resolution=85)
void renderTo (QwtPlot *, QPrinter &) const
void renderTo (QwtPlot *, QPaintDevice &p) const
virtual void render (QwtPlot *, QPainter *, const QRectF &rect) const
virtual void renderLegendItem (const QwtPlot *, QPainter *, const QWidget *, const QRectF
&) const
virtual void renderTitle (const QwtPlot *, QPainter *, const QRectF &) const
virtual void renderScale (const QwtPlot *, QPainter *, int axisId, int startDist, int
endDist, int baseDist, const QRectF &) const
virtual void renderCanvas (const QwtPlot *, QPainter *, const QRectF &canvasRect, const
QwtScaleMap *maps) const
virtual void renderLegend (const QwtPlot *, QPainter *, const QRectF &) const
Protected Member Functions
void buildCanvasMaps (const QwtPlot *, const QRectF &, QwtScaleMap maps[]) const
Detailed Description
Renderer for exporting a plot to a document, a printer or anything else, that is supported
by QPainter/QPaintDevice.
Member Typedef Documentation
typedef QFlags<DiscardFlag> QwtPlotRenderer::DiscardFlags
Disard flags.
typedef QFlags<LayoutFlag> QwtPlotRenderer::LayoutFlags
Layout flags.
Member Enumeration Documentation
enum QwtPlotRenderer::DiscardFlag
Disard flags.
Enumerator:
DiscardNone
Render all components of the plot.
DiscardBackground
Don't render the background of the plot.
DiscardTitle
Don't render the title of the plot.
DiscardLegend
Don't render the legend of the plot.
DiscardCanvasBackground
Don't render the background of the canvas.
enum QwtPlotRenderer::LayoutFlag
Layout flags. See also:
setLayoutFlag(), testLayoutFlag()
Enumerator:
DefaultLayout
Use the default layout without margins and frames.
KeepFrames
Render all frames of the plot.
FrameWithScales
Instead of the scales a box is painted around the plot canvas, where the scale
ticks are aligned to.
Constructor & Destructor Documentation
QwtPlotRenderer::QwtPlotRenderer (QObject *parent = NULL) [explicit] Constructor
Parameters:
parent Parent object
QwtPlotRenderer::~QwtPlotRenderer () [virtual]
Destructor.
Member Function Documentation
void QwtPlotRenderer::buildCanvasMaps (const QwtPlot *plot, const QRectF &canvasRect,
QwtScaleMapmaps[]) const [protected] Calculated the scale maps for rendering the canvas
Parameters:
plot Plot widget
canvasRect Target rectangle
maps Scale maps to be calculated
QwtPlotRenderer::DiscardFlags QwtPlotRenderer::discardFlags () const Returns:
Flags, indicating what to discard from rendering
See also:
DiscardFlag, setDiscardFlags(), setDiscardFlag(), testDiscardFlag()
QwtPlotRenderer::LayoutFlags QwtPlotRenderer::layoutFlags () const Returns:
Layout flags
See also:
LayoutFlag, setLayoutFlags(), setLayoutFlag(), testLayoutFlag()
void QwtPlotRenderer::render (QwtPlot *plot, QPainter *painter, const QRectF &plotRect) const
[virtual] Paint the contents of a QwtPlot instance into a given rectangle.
Parameters:
plot Plot to be rendered
painter Painter
plotRect Bounding rectangle
See also:
renderDocument(), renderTo(), QwtPainter::setRoundingAlignment()
void QwtPlotRenderer::renderCanvas (const QwtPlot *plot, QPainter *painter, const QRectF
&canvasRect, const QwtScaleMap *map) const [virtual] Render the canvas into a given
rectangle.
Parameters:
plot Plot widget
painter Painter
map Maps mapping between plot and paint device coordinates
canvasRect Canvas rectangle
void QwtPlotRenderer::renderDocument (QwtPlot *plot, const QString &fileName, const QSizeF
&sizeMM, intresolution = 85) Render a plot to a file
The format of the document will be autodetected from the suffix of the filename.
Parameters:
plot Plot widget
fileName Path of the file, where the document will be stored
sizeMM Size for the document in millimeters.
resolution Resolution in dots per Inch (dpi)
void QwtPlotRenderer::renderDocument (QwtPlot *plot, const QString &fileName, const QString
&format, const QSizeF &sizeMM, intresolution = 85) Render a plot to a file
Supported formats are:
• pdf
Portable Document Format PDF
• ps
Postcript
• svg
Scalable Vector Graphics SVG
• all image formats supported by Qt
see QImageWriter::supportedImageFormats()
Scalable vector graphic formats like PDF or SVG are superior to raster graphics formats.
Parameters:
plot Plot widget
fileName Path of the file, where the document will be stored
format Format for the document
sizeMM Size for the document in millimeters.
resolution Resolution in dots per Inch (dpi)
See also:
renderTo(), render(), QwtPainter::setRoundingAlignment()
void QwtPlotRenderer::renderLegend (const QwtPlot *plot, QPainter *painter, const QRectF
&rect) const [virtual] Render the legend into a given rectangle.
Parameters:
plot Plot widget
painter Painter
rect Bounding rectangle
void QwtPlotRenderer::renderLegendItem (const QwtPlot *plot, QPainter *painter, const QWidget
*widget, const QRectF &rect) const [virtual] Render the legend item into a given
rectangle.
Parameters:
plot Plot widget
painter Painter
widget Widget representing a legend item
rect Bounding rectangle
Note:
When widget is not derived from QwtLegendItem renderLegendItem does nothing and needs
to be overloaded
void QwtPlotRenderer::renderScale (const QwtPlot *plot, QPainter *painter, intaxisId,
intstartDist, intendDist, intbaseDist, const QRectF &rect) const [virtual]
Paint a scale into a given rectangle. Paint the scale into a given rectangle. Parameters:
plot Plot widget
painter Painter
axisId Axis
startDist Start border distance
endDist End border distance
baseDist Base distance
rect Bounding rectangle
void QwtPlotRenderer::renderTitle (const QwtPlot *plot, QPainter *painter, const QRectF &rect)
const [virtual] Render the title into a given rectangle.
Parameters:
plot Plot widget
painter Painter
rect Bounding rectangle
void QwtPlotRenderer::renderTo (QwtPlot *plot, QPrinter &printer) const
Render the plot to a QPrinter. This function renders the contents of a QwtPlot instance to
QPaintDevice object. The size is derived from the printer metrics.
Parameters:
plot Plot to be rendered
printer Printer to paint on
See also:
renderDocument(), render(), QwtPainter::setRoundingAlignment()
void QwtPlotRenderer::renderTo (QwtPlot *plot, QPaintDevice &paintDevice) const
Render the plot to a QPaintDevice. This function renders the contents of a QwtPlot
instance to QPaintDevice object. The target rectangle is derived from its device metrics.
Parameters:
plot Plot to be rendered
paintDevice device to paint on, f.e a QImage
See also:
renderDocument(), render(), QwtPainter::setRoundingAlignment()
void QwtPlotRenderer::setDiscardFlag (DiscardFlagflag, boolon = true) Change a flag,
indicating what to discard from rendering
Parameters:
flag Flag to change
on On/Off
See also:
DiscardFlag, testDiscardFlag(), setDiscardFlags(), discardFlags()
void QwtPlotRenderer::setDiscardFlags (DiscardFlagsflags) Set the flags, indicating what to
discard from rendering
Parameters:
flags Flags
See also:
DiscardFlag, setDiscardFlag(), testDiscardFlag(), discardFlags()
void QwtPlotRenderer::setLayoutFlag (LayoutFlagflag, boolon = true) Change a layout flag
Parameters:
flag Flag to change
on On/Off
See also:
LayoutFlag, testLayoutFlag(), setLayoutFlags(), layoutFlags()
void QwtPlotRenderer::setLayoutFlags (LayoutFlagsflags) Set the layout flags
Parameters:
flags Flags
See also:
LayoutFlag, setLayoutFlag(), testLayoutFlag(), layoutFlags()
bool QwtPlotRenderer::testDiscardFlag (DiscardFlagflag) const Check if a flag is set.
Parameters:
flag Flag to be tested
See also:
DiscardFlag, setDiscardFlag(), setDiscardFlags(), discardFlags()
bool QwtPlotRenderer::testLayoutFlag (LayoutFlagflag) const Check if a flag is set.
Parameters:
flag Flag to be tested
See also:
LayoutFlag, setLayoutFlag(), setLayoutFlags(), layoutFlags()
Author
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