Provided by: libqwt5-doc_5.2.3-1_all 
NAME
QwtPlotLayout -
SYNOPSIS
#include <qwt_plot_layout.h>
Public Types
enum Options { AlignScales = 1, IgnoreScrollbars = 2, IgnoreFrames = 4, IgnoreMargin =
8, IgnoreLegend = 16 }
Public Member Functions
QwtPlotLayout ()
virtual ~QwtPlotLayout ()
virtual void activate (const QwtPlot *, const QRect &rect, int options=0)
bool alignCanvasToScales () const
int canvasMargin (int axis) const
const QRect & canvasRect () const
virtual void invalidate ()
QwtPlot::LegendPosition legendPosition () const
double legendRatio () const
const QRect & legendRect () const
int margin () const
virtual QSize minimumSizeHint (const QwtPlot *) const
const QRect & scaleRect (int axis) const
void setAlignCanvasToScales (bool)
void setCanvasMargin (int margin, int axis=-1)
void setLegendPosition (QwtPlot::LegendPosition pos, double ratio)
void setLegendPosition (QwtPlot::LegendPosition pos)
void setLegendRatio (double ratio)
void setMargin (int)
void setSpacing (int)
int spacing () const
const QRect & titleRect () const
Protected Member Functions
QRect alignLegend (const QRect &canvasRect, const QRect &legendRect) const
void alignScales (int options, QRect &canvasRect, QRect scaleRect[QwtPlot::axisCnt]) const
void expandLineBreaks (int options, const QRect &rect, int &dimTitle, int
dimAxes[QwtPlot::axisCnt]) const
QRect layoutLegend (int options, const QRect &) const
Detailed Description
Layout engine for QwtPlot.
It is used by the QwtPlot widget to organize its internal widgets or by QwtPlot::print()
to render its content to a QPaintDevice like a QPrinter, QPixmap/QImage or QSvgRenderer.
Member Enumeration Documentation
enum QwtPlotLayout::Options
Options to configure the plot layout engine
• AlignScales
Unused
• IgnoreScrollbars
Ignore the dimension of the scrollbars. There are no scrollbars, when the plot is
rendered to a paint device (QwtPlot::print() ).
• IgnoreFrames
Ignore all frames. QwtPlot::print() doesn't paint them.
• IgnoreMargin
Ignore the margin().
• IgnoreLegend
Ignore the legend.
See also:
activate()
Member Function Documentation
void QwtPlotLayout::activate (const QwtPlot *plot, const QRect &plotRect, intoptions = 0)
[virtual]
Recalculate the geometry of all components. Parameters:
plot Plot to be layout
plotRect Rect where to place the components
options Options
See also:
invalidate(), Options, titleRect(), legendRect(), scaleRect(), canvasRect()
bool QwtPlotLayout::alignCanvasToScales () const
Return the align-canvas-to-axis-scales setting. The canvas may:
• extend beyond the axis scale ends to maximize its size
• align with the axis scale ends to control its size.
Returns:
align-canvas-to-axis-scales setting
See also:
setAlignCanvasToScales, setCanvasMargin()
Note:
In this context the term 'scale' means the backbone of a scale.
QRect QwtPlotLayout::alignLegend (const QRect &canvasRect, const QRect &legendRect) const
[protected]
Align the legend to the canvas
Parameters:
canvasRect Geometry of the canvas
legendRect Maximum geometry for the legend
Returns:
Geometry for the aligned legend
void QwtPlotLayout::alignScales (intoptions, QRect &canvasRect,
QRectscaleRect[QwtPlot::axisCnt]) const [protected]
Align the ticks of the axis to the canvas borders using the empty corners.
See also:
Options
int QwtPlotLayout::canvasMargin (intaxis) const
Returns:
Margin around the scale tick borders
See also:
setCanvasMargin()
const QRect & QwtPlotLayout::canvasRect () const
Returns:
Geometry for the canvas
See also:
activate(), invalidate()
void QwtPlotLayout::expandLineBreaks (intoptions, const QRect &rect, int &dimTitle,
intdimAxis[QwtPlot::axisCnt]) const [protected]
Expand all line breaks in text labels, and calculate the height of their widgets in
orientation of the text.
Parameters:
options Options how to layout the legend
rect Bounding rect for title, axes and canvas.
dimTitle Expanded height of the title widget
dimAxis Expanded heights of the axis in axis orientation.
See also:
Options
void QwtPlotLayout::invalidate () [virtual]
Invalidate the geometry of all components.
See also:
activate()
QRect QwtPlotLayout::layoutLegend (intoptions, const QRect &rect) const [protected]
Find the geometry for the legend
Parameters:
options Options how to layout the legend
rect Rectangle where to place the legend
Returns:
Geometry for the legend
See also:
Options
QwtPlot::LegendPosition QwtPlotLayout::legendPosition () const
Returns:
Position of the legend
See also:
setLegendPosition(), QwtPlot::setLegendPosition(), QwtPlot::legendPosition()
double QwtPlotLayout::legendRatio () const
Returns:
The relative size of the legend in the plot.
See also:
setLegendPosition()
const QRect & QwtPlotLayout::legendRect () const
Returns:
Geometry for the legend
See also:
activate(), invalidate()
int QwtPlotLayout::margin () const
Returns:
margin
See also:
setMargin(), spacing(), QwtPlot::margin()
QSize QwtPlotLayout::minimumSizeHint (const QwtPlot *plot) const [virtual]
Return a minimum size hint. See also:
QwtPlot::minimumSizeHint()
const QRect & QwtPlotLayout::scaleRect (intaxis) const
Parameters:
axis Axis index
Returns:
Geometry for the scale
See also:
activate(), invalidate()
void QwtPlotLayout::setAlignCanvasToScales (boolalignCanvasToScales)
Change the align-canvas-to-axis-scales setting. The canvas may:
• extend beyond the axis scale ends to maximize its size,
• align with the axis scale ends to control its size.
Parameters:
alignCanvasToScales New align-canvas-to-axis-scales setting
See also:
setCanvasMargin()
Note:
In this context the term 'scale' means the backbone of a scale.
Warning:
In case of alignCanvasToScales == true canvasMargin will have no effect
void QwtPlotLayout::setCanvasMargin (intmargin, intaxis = -1)
Change a margin of the canvas. The margin is the space above/below the scale ticks. A
negative margin will be set to -1, excluding the borders of the scales.
Parameters:
margin New margin
axis One of QwtPlot::Axis. Specifies where the position of the margin. -1 means margin
at all borders.
See also:
canvasMargin()
Warning:
The margin will have no effect when alignCanvasToScales is true
void QwtPlotLayout::setLegendPosition (QwtPlot::LegendPositionpos, doubleratio)
Specify the position of the legend. Parameters:
pos The legend's position.
ratio Ratio between legend and the bounding rect of title, canvas and axes. The legend
will be shrinked if it would need more space than the given ratio. The ratio is
limited to ]0.0 .. 1.0]. In case of <= 0.0 it will be reset to the default ratio. The
default vertical/horizontal ratio is 0.33/0.5.
See also:
QwtPlot::setLegendPosition()
void QwtPlotLayout::setLegendPosition (QwtPlot::LegendPositionpos)
Specify the position of the legend. Parameters:
pos The legend's position. Valid values are QwtPlot::LeftLegend, QwtPlot::RightLegend,
QwtPlot::TopLegend, QwtPlot::BottomLegend.
See also:
QwtPlot::setLegendPosition()
void QwtPlotLayout::setLegendRatio (doubleratio)
Specify the relative size of the legend in the plot
Parameters:
ratio Ratio between legend and the bounding rect of title, canvas and axes. The legend
will be shrinked if it would need more space than the given ratio. The ratio is
limited to ]0.0 .. 1.0]. In case of <= 0.0 it will be reset to the default ratio. The
default vertical/horizontal ratio is 0.33/0.5.
void QwtPlotLayout::setMargin (intmargin)
Change the margin of the plot. The margin is the space around all components.
Parameters:
margin new margin
See also:
margin(), setSpacing(), QwtPlot::setMargin()
void QwtPlotLayout::setSpacing (intspacing)
Change the spacing of the plot. The spacing is the distance between the plot components.
Parameters:
spacing new spacing
See also:
setMargin(), spacing()
int QwtPlotLayout::spacing () const
Returns:
spacing
See also:
margin(), setSpacing()
const QRect & QwtPlotLayout::titleRect () const
Returns:
Geometry for the title
See also:
activate(), invalidate()
Author
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