QwtPlotLayout(3)

NAME
QwtPlotLayout - Layout engine for QwtPlot.

SYNOPSIS

#include <qwt_plot_layout.h>

  Public Types

enum Option { AlignScales = 0x01, IgnoreScrollbars = 0x02, IgnoreFrames = 0x04, IgnoreLegend = 0x08, IgnoreTitle = 0x10, IgnoreFooter = 0x20 }
typedef QFlags< Option > Options
Layout options.

  Public Member Functions

QwtPlotLayout ()
Constructor.
virtual ~QwtPlotLayout ()
Destructor.
void setCanvasMargin (int margin, int axis=-1)
int canvasMargin (int axisId) const
void setAlignCanvasToScales (bool)
Set the align-canvas-to-axis-scales flag for all axes.
void setAlignCanvasToScale (int axisId, bool)
bool alignCanvasToScale (int axisId) const
void setSpacing (int)
int spacing () const
void setLegendPosition (QwtPlot::LegendPosition pos, double ratio)
Specify the position of the legend.
void setLegendPosition (QwtPlot::LegendPosition pos)
Specify the position of the legend.
QwtPlot::LegendPosition legendPosition () const
void setLegendRatio (double ratio)
double legendRatio () const
virtual QSize minimumSizeHint (const QwtPlot *) const
virtual void activate (const QwtPlot *, const QRectF &plotRect, Options options=0x00)
Recalculate the geometry of all components.
virtual void invalidate ()
QRectF titleRect () const
QRectF footerRect () const
QRectF legendRect () const
QRectF scaleRect (int axis) const
QRectF canvasRect () const

  Protected Member Functions

void setTitleRect (const QRectF &)
Set the geometry for the title.
void setFooterRect (const QRectF &)
Set the geometry for the footer.
void setLegendRect (const QRectF &)
Set the geometry for the legend.
void setScaleRect (int axis, const QRectF &)
Set the geometry for an axis.
void setCanvasRect (const QRectF &)
Set the geometry for the canvas.
QRectF layoutLegend (Options options, const QRectF &) const
QRectF alignLegend (const QRectF &canvasRect, const QRectF &legendRect) const
void expandLineBreaks (Options options, const QRectF &rect, int &dimTitle, int &dimFooter, int dimAxes[QwtPlot::axisCnt]) const
void alignScales (Options 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.

See also:
    QwtPlot::setPlotLayout()

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.

IgnoreTitle
    Ignore the title.

IgnoreFooter
    Ignore the footer.

Member Function Documentation

  void QwtPlotLayout::activate (const QwtPlot * plot, const QRectF & plotRect, Options options = 0x00) [virtual]

Recalculate the geometry of all components.

Parameters:
    plot Plot to be layout
    plotRect Rectangle where to place the components
    options Layout options

See also:
    invalidate(), titleRect(), footerRect() legendRect(), scaleRect(), canvasRect()

  bool QwtPlotLayout::alignCanvasToScale (int axisId) 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.

Parameters:
    axisId Axis index

Returns:
    align-canvas-to-axis-scales setting

See also:
    setAlignCanvasToScale(), setAlignCanvasToScale(), setCanvasMargin()

  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 (Options options, QRectF & canvasRect, QRectF scaleRect[QwtPlot::axisCnt]) const [protected]
Align the ticks of the axis to the canvas borders using the empty corners.

Parameters:
    options Layout options
    canvasRect Geometry of the canvas ( IN/OUT )
    scaleRect Geometries of the scales ( IN/OUT )

See also:
    Options

  int QwtPlotLayout::canvasMargin (int axisId) const

Parameters:
    axisId Axis index

Returns:
    Margin around the scale tick borders

See also:
    setCanvasMargin()

  QRectF QwtPlotLayout::canvasRect () const

Returns:
    Geometry for the canvas

See also:
    activate(), invalidate()

  void QwtPlotLayout::expandLineBreaks (Options options, const QRectF & rect, int & dimTitle, int & dimFooter, int dimAxes[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 rectangle for title, footer, axes and canvas.
    dimTitle Expanded height of the title widget
    dimFooter Expanded height of the footer widget
    dimAxes Expanded heights of the axis in axis orientation.

See also:
    Options

  QRectF QwtPlotLayout::footerRect () const

Returns:
    Geometry for the footer

See also:
    activate(), invalidate()

  void QwtPlotLayout::invalidate () [virtual]
Invalidate the geometry of all components.

See also:
    activate()

  QRectF QwtPlotLayout::layoutLegend (Options options, 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()

  QRectF QwtPlotLayout::legendRect () const

Returns:
    Geometry for the legend

See also:
    activate(), invalidate()

  QSize QwtPlotLayout::minimumSizeHint (const QwtPlot * plot) const [virtual]

Returns:
    Minimum size hint

Parameters:
    plot Plot widget

See also:
    QwtPlot::minimumSizeHint()

  QRectF QwtPlotLayout::scaleRect (int axis) const

Parameters:
    axis Axis index

Returns:
    Geometry for the scale

See also:
    activate(), invalidate()

  void QwtPlotLayout::setAlignCanvasToScale (int axisId, bool on)
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.

The axisId parameter is somehow confusing as it identifies a border of the plot and not the axes, that are aligned. F.e when QwtPlot::yLeft is set, the left end of the the x-axes ( QwtPlot::xTop, QwtPlot::xBottom ) is aligned.

Parameters:
    axisId Axis index
    on New align-canvas-to-axis-scales setting

See also:
    setCanvasMargin(), alignCanvasToScale(), setAlignCanvasToScales()

Warning:
    In case of on == true canvasMargin() will have no effect

  void QwtPlotLayout::setAlignCanvasToScales (bool on)

Set the align-canvas-to-axis-scales flag for all axes.

Parameters:
    on True/False

See also:
    setAlignCanvasToScale(), alignCanvasToScale()

  void QwtPlotLayout::setCanvasMargin (int margin, int axis = -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 alignCanvasToScale() is true

  void QwtPlotLayout::setCanvasRect (const QRectF & rect) [protected]

Set the geometry for the canvas. This method is intended to be used from derived layouts overloading activate()

See also:
    canvasRect(), activate()

  void QwtPlotLayout::setFooterRect (const QRectF & rect) [protected]

Set the geometry for the footer. This method is intended to be used from derived layouts overloading activate()

See also:
    footerRect(), activate()

  void QwtPlotLayout::setLegendPosition (QwtPlot::LegendPosition pos, double ratio)

Specify the position of the legend.

Parameters:
    pos The legend's position.
    ratio Ratio between legend and the bounding rectangle of title, footer, canvas and axes. The legend will be shrunk 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::LegendPosition pos)

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 (double ratio)
Specify the relative size of the legend in the plot

Parameters:
    ratio Ratio between legend and the bounding rectangle of title, footer, canvas and axes. The legend will be shrunk 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::setLegendRect (const QRectF & rect) [protected]

Set the geometry for the legend. This method is intended to be used from derived layouts overloading activate()

Parameters:
    rect Rectangle for the legend

See also:
    legendRect(), activate()

  void QwtPlotLayout::setScaleRect (int axis, const QRectF & rect) [protected]

Set the geometry for an axis. This method is intended to be used from derived layouts overloading activate()

Parameters:
    axis Axis index
    rect Rectangle for the scale

See also:
    scaleRect(), activate()

  void QwtPlotLayout::setSpacing (int spacing)
Change the spacing of the plot. The spacing is the distance between the plot components.

Parameters:
    spacing New spacing

See also:
    setCanvasMargin(), spacing()

  void QwtPlotLayout::setTitleRect (const QRectF & rect) [protected]

Set the geometry for the title. This method is intended to be used from derived layouts overloading activate()

See also:
    titleRect(), activate()

  int QwtPlotLayout::spacing () const

Returns:
    Spacing

See also:
    margin(), setSpacing()

  QRectF QwtPlotLayout::titleRect () const

Returns:
    Geometry for the title

See also:
    activate(), invalidate()

Author

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