Provided by: libqwt-doc_6.0.0-1.2_all 
NAME
QwtPlotLayout -
Layout engine for QwtPlot.
SYNOPSIS
#include <qwt_plot_layout.h>
Public Types
enum Option { AlignScales = 0x01, IgnoreScrollbars = 0x02, IgnoreFrames = 0x04, IgnoreLegend = 0x08 }
typedef QFlags< Option > Options
Public Member Functions
QwtPlotLayout ()
virtual ~QwtPlotLayout ()
void setCanvasMargin (int margin, int axis=-1)
int canvasMargin (int axis) const
void setAlignCanvasToScales (bool)
bool alignCanvasToScales () const
void setSpacing (int)
int spacing () const
void setLegendPosition (QwtPlot::LegendPosition pos, double ratio)
void setLegendPosition (QwtPlot::LegendPosition pos)
QwtPlot::LegendPosition legendPosition () const
void setLegendRatio (double ratio)
double legendRatio () const
virtual QSize minimumSizeHint (const QwtPlot *) const
virtual void activate (const QwtPlot *, const QRectF &rect, Options options=0x00)
virtual void invalidate ()
const QRectF & titleRect () const
const QRectF & legendRect () const
const QRectF & scaleRect (int axis) const
const QRectF & canvasRect () const
Protected Member Functions
QRectF layoutLegend (Options options, const QRectF &) const
QRectF alignLegend (const QRectF &canvasRect, const QRectF &legendRect) const
void expandLineBreaks (int options, const QRectF &rect, int &dimTitle, int dimAxes[QwtPlot::axisCnt])
const
void alignScales (int options, QRectF &canvasRect, QRectF scaleRect[QwtPlot::axisCnt]) 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 Typedef Documentation
typedef QFlags<Option> QwtPlotLayout::Options
Layout options.
Member Enumeration Documentation
enum QwtPlotLayout::Option Options to configure the plot layout engine
See also:
activate(), QwtPlotRenderer
Enumerator:
AlignScales
Unused.
IgnoreScrollbars
Ignore the dimension of the scrollbars. There are no scrollbars, when the plot is not rendered to
widgets.
IgnoreFrames
Ignore all frames.
IgnoreLegend
Ignore the legend.
Constructor & Destructor Documentation
QwtPlotLayout::QwtPlotLayout () [explicit]
Constructor.
QwtPlotLayout::~QwtPlotLayout () [virtual]
Destructor.
Member Function Documentation
void QwtPlotLayout::activate (const QwtPlot *plot, const QRectF &plotRect, Optionsoptions = 0x00) [virtual]
Recalculate the geometry of all components. Parameters:
plot Plot to be layout
plotRect Rect where to place the components
options Layout options
See also:
invalidate(), 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.
QRectF QwtPlotLayout::alignLegend (const QRectF &canvasRect, const QRectF &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, QRectF &canvasRect, QRectFscaleRect[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 QRectF & QwtPlotLayout::canvasRect () const Returns:
Geometry for the canvas
See also:
activate(), invalidate()
void QwtPlotLayout::expandLineBreaks (intoptions, const QRectF &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()
QRectF QwtPlotLayout::layoutLegend (Optionsoptions, const QRectF &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 QRectF & QwtPlotLayout::legendRect () const Returns:
Geometry for the legend
See also:
activate(), invalidate()
QSize QwtPlotLayout::minimumSizeHint (const QwtPlot *plot) const [virtual]
Return a minimum size hint. See also:
QwtPlot::minimumSizeHint()
const QRectF & 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)
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::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::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::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 QRectF & QwtPlotLayout::titleRect () const Returns:
Geometry for the title
See also:
activate(), invalidate()
Author
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