QwtPlotLayout(3) 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


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

QwtPlotLayout ()

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

virtual ~QwtPlotLayout ()

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::OptionsOptions 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, 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 () constReturn 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) constReturns:

Margin around the scale tick borders

See also:

setCanvasMargin()

const QRect & QwtPlotLayout::canvasRect () constReturns:

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 () constReturns:

Position of the legend

See also:

setLegendPosition(), QwtPlot::setLegendPosition(), QwtPlot::legendPosition()

double QwtPlotLayout::legendRatio () constReturns:

The relative size of the legend in the plot.

See also:

setLegendPosition()

const QRect & QwtPlotLayout::legendRect () constReturns:

Geometry for the legend

See also:

activate(), invalidate()

int QwtPlotLayout::margin () constReturns:

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) constParameters:

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 () constReturns:

spacing

See also:

margin(), setSpacing()

const QRect & QwtPlotLayout::titleRect () constReturns:

Geometry for the title

See also:

activate(), invalidate()

Author

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