QwtPlotLayout(3)

NAME
QwtPlotLayout - Layout engine for QwtPlot.

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 ()
void setMargin (int)
int margin () const
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 QRect &rect, int options=0)
virtual void invalidate ()
const QRect & titleRect () const
const QRect & legendRect () const
const QRect & scaleRect (int axis) const
const QRect & canvasRect () const

  Protected Member Functions
QRect layoutLegend (int options, const QRect &) const
QRect alignLegend (const QRect &canvasRect, const QRect &legendRect) const
void expandLineBreaks (int options, const QRect &rect, int &dimTitle, int dimAxes[QwtPlot::axisCnt]) const
void alignScales (int options, QRect &canvasRect, QRect 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 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()

Constructor & Destructor Documentation

  QwtPlotLayout::QwtPlotLayout () [explicit]

Constructor.

  QwtPlotLayout::~QwtPlotLayout () [virtual]

Destructor.

Member Function Documentation

  void QwtPlotLayout::activate (const QwtPlot * plot, const QRect & plotRect, int options = 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 (int options, QRect & canvasRect, QRect scaleRect[QwtPlot::axisCnt]) const [protected]

Align the ticks of the axis to the canvas borders using the empty corners.

See also:
    Options

  int QwtPlotLayout::canvasMargin (int axis) 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 (int options, const QRect & rect, int & dimTitle, int dimAxis[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 (int options, 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 (int axis) const

Parameters:
    axis Axis index

Returns:
    Geometry for the scale

See also:
    activate(), invalidate()

  void QwtPlotLayout::setAlignCanvasToScales (bool alignCanvasToScales)

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 (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 alignCanvasToScales is true

  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::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 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 (double ratio)

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 (int margin)

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 (int spacing)

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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