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QwtPlot

NAME

QwtPlot -

SYNOPSIS

Inherits QwtPlotDict.

Detailed Description

A 2-D plotting widget.

QwtPlot is a widget for plotting two-dimensional graphs. An unlimited number of plot items can be displayed on its canvas. Plot items might be curves (QwtPlotCurve), markers (QwtPlotMarker), the grid (QwtPlotGrid), or anything else derived from QwtPlotItem. A plot can have up to four axes, with each plot item attached to an x- and a y axis. The scales at the axes can be explicitely set (QwtScaleDiv), or are calculated from the plot items, using algorithms (QwtScaleEngine) which can be configured separately for each axis.

Example.RS 4 The following example shows (schematically) the most simple way to use QwtPlot. By default, only the left and bottom axes are visible and their scales are computed automatically.

 
 #include <qwt_plot.h>
 #include <qwt_plot_curve.h>
 
 QwtPlot *myPlot;
 double x[100], y1[100], y2[100];        // x and y values
 
 myPlot = new QwtPlot("Two Curves", parent);
 
 // add curves
 QwtPlotCurve *curve1 = new QwtPlotCurve("Curve 1");
 QwtPlotCurve *curve2 = new QwtPlotCurve("Curve 2");
 
 getSomeValues(x, y1, y2);
 
 // copy the data into the curves
 curve1->setData(x, y1, 100);
 curve2->setData(x, y2, 100);
 
 curve1->attach(myPlot);
 curve2->attach(myPlot);
 
 // finally, refresh the plot
 myPlot->replot();
 
 

 

Definition at line 77 of file qwt_plot.h.

Public Types

enum Axis { yLeft, yRight, xBottom, xTop, axisCnt }

enum LegendPosition { LeftLegend, RightLegend, BottomLegend, TopLegend, ExternalLegend }

Public Slots

virtual void clear ()

virtual void replot ()

void autoRefresh ()

Signals

void legendClicked (QwtPlotItem *plotItem)

void legendChecked (QwtPlotItem *plotItem, bool on)

Public Member Functions

QwtPlot (QWidget *=NULL)

QwtPlot (const QwtText &title, QWidget *p=NULL)

virtual ~QwtPlot ()

void applyProperties (const QString &)

QString grabProperties () const

void setAutoReplot (bool tf=true)

bool autoReplot () const

void print (QPaintDevice &p, const QwtPlotPrintFilter &=QwtPlotPrintFilter()) const

virtual void print (QPainter *, const QRect &rect, const QwtPlotPrintFilter &=QwtPlotPrintFilter()) const

QwtPlotLayout * plotLayout ()

const QwtPlotLayout * plotLayout () const

void setMargin (int margin)

int margin () const

void setTitle (const QString &)

void setTitle (const QwtText &t)

QwtText title () const

QwtTextLabel * titleLabel ()

const QwtTextLabel * titleLabel () const

QwtPlotCanvas * canvas ()

const QwtPlotCanvas * canvas () const

void setCanvasBackground (const QColor &c)

const QColor & canvasBackground () const

void setCanvasLineWidth (int w)

int canvasLineWidth () const

virtual QwtScaleMap canvasMap (int axisId) const

double invTransform (int axisId, int pos) const

int transform (int axisId, double value) const

QwtScaleEngine * axisScaleEngine (int axisId)

const QwtScaleEngine * axisScaleEngine (int axisId) const

void setAxisScaleEngine (int axisId, QwtScaleEngine *)

void setAxisAutoScale (int axisId)

bool axisAutoScale (int axisId) const

void enableAxis (int axisId, bool tf=true)

bool axisEnabled (int axisId) const

void setAxisFont (int axisId, const QFont &f)

QFont axisFont (int axisId) const

void setAxisScale (int axisId, double min, double max, double step=0)

void setAxisScaleDiv (int axisId, const QwtScaleDiv &)

void setAxisScaleDraw (int axisId, QwtScaleDraw *)

double axisStepSize (int axisId) const

const QwtScaleDiv * axisScaleDiv (int axisId) const

QwtScaleDiv * axisScaleDiv (int axisId)

const QwtScaleDraw * axisScaleDraw (int axisId) const

QwtScaleDraw * axisScaleDraw (int axisId)

const QwtScaleWidget * axisWidget (int axisId) const

QwtScaleWidget * axisWidget (int axisId)

void setAxisLabelAlignment (int axisId, Qt::Alignment)

void setAxisLabelRotation (int axisId, double rotation)

void setAxisTitle (int axisId, const QString &)

void setAxisTitle (int axisId, const QwtText &)

QwtText axisTitle (int axisId) const

void setAxisMaxMinor (int axisId, int maxMinor)

int axisMaxMajor (int axisId) const

void setAxisMaxMajor (int axisId, int maxMajor)

int axisMaxMinor (int axisId) const

void insertLegend (QwtLegend *, LegendPosition=QwtPlot::RightLegend, double ratio=-1.0)

QwtLegend * legend ()

const QwtLegend * legend () const

virtual void polish ()

virtual QSize sizeHint () const

virtual QSize minimumSizeHint () const

virtual void updateLayout ()

virtual bool event (QEvent *)

Protected Slots

virtual void legendItemClicked ()

virtual void legendItemChecked (bool)

Protected Member Functions

virtual void drawCanvas (QPainter *)

virtual void drawItems (QPainter *, const QRect &, const QwtScaleMap maps[axisCnt], const QwtPlotPrintFilter &) const

virtual void updateTabOrder ()

void updateAxes ()

virtual void resizeEvent (QResizeEvent *e)

virtual void printLegendItem (QPainter *, const QWidget *, const QRect &) const

virtual void printTitle (QPainter *, const QRect &) const

virtual void printScale (QPainter *, int axisId, int startDist, int endDist, int baseDist, const QRect &) const

virtual void printCanvas (QPainter *, const QRect &boundingRect, const QRect &canvasRect, const QwtScaleMap maps[axisCnt], const QwtPlotPrintFilter &) const

virtual void printLegend (QPainter *, const QRect &) const

Static Protected Member Functions

static bool axisValid (int axisId)

Friends

class QwtPlotCanvas

Member Enumeration Documentation

enum QwtPlot::Axis

Axis index.

Definition at line 87 of file qwt_plot.h.

enum QwtPlot::LegendPosition

Position of the legend, relative to the canvas.

ExternalLegend means that only the content of the legend will be handled by QwtPlot, but not its geometry. This might be interesting if an application wants to have a legend in an external window.

Definition at line 105 of file qwt_plot.h.

Constructor & Destructor Documentation

QwtPlot::QwtPlot (QWidget * parent = NULL) [explicit]

Constructor.

Parameters:

parent Parent widget

Definition at line 52 of file qwt_plot.cpp.

QwtPlot::QwtPlot (const QwtText & title, QWidget * parent = NULL) [explicit]

Constructor.

Parameters:

title Title text
parent Parent widget

Definition at line 63 of file qwt_plot.cpp.

References title().

QwtPlot::~QwtPlot () [virtual]

Destructor.

Definition at line 84 of file qwt_plot.cpp.

References QwtPlotDict::autoDelete(), and QwtPlotDict::detachItems().

Member Function Documentation

void QwtPlot::setAutoReplot (bool tf = true)

Set or reset the autoReplot option.

If the autoReplot option is set, the plot will be updated implicitly by manipulating member functions. Since this may be time-consuming, it is recommended to leave this option switched off and call replot() explicitly if necessary.

The autoReplot option is set to false by default, which means that the user has to call replot() in order to make changes visible.

Parameters:

tf true or false. Defaults to true.

See also:

replot()

Definition at line 184 of file qwt_plot.cpp.

Referenced by QwtPlotPrintFilter::apply(), QwtPlotCanvas::drawContents(), QwtPlotPanner::moveCanvas(), replot(), QwtPlotZoomer::rescale(), QwtPlotMagnifier::rescale(), and QwtPlotPrintFilter::reset().

bool QwtPlot::autoReplot () const

Returns:

true if the autoReplot option is set.

Definition at line 190 of file qwt_plot.cpp.

Referenced by QwtPlotPrintFilter::apply(), QwtPlotCanvas::drawContents(), QwtPlotPanner::moveCanvas(), replot(), QwtPlotZoomer::rescale(), QwtPlotMagnifier::rescale(), and QwtPlotPrintFilter::reset().

void QwtPlot::print (QPaintDevice & paintDev, const QwtPlotPrintFilter & pfilter = QwtPlotPrintFilter()) const

Print the plot to a QPaintDevice (QPrinter) This function prints the contents of a QwtPlot instance to QPaintDevice object. The size is derived from its device metrics.

Parameters:

paintDev device to paint on, often a printer
pfilter print filter

See also:

QwtPlot::print
QwtPlotPrintFilter

Definition at line 43 of file qwt_plot_print.cpp.

void QwtPlot::print (QPainter * painter, const QRect & plotRect, const QwtPlotPrintFilter & pfilter = QwtPlotPrintFilter()) const [virtual]

Paint the plot into a given rectangle. Paint the contents of a QwtPlot instance into a given rectangle.

Parameters:

painter Painter
plotRect Bounding rectangle
pfilter Print filter

See also:

QwtPlotPrintFilter

Definition at line 73 of file qwt_plot_print.cpp.

References QwtPlotPrintFilter::apply(), axisEnabled(), axisScaleDiv(), axisScaleEngine(), axisWidget(), QwtPlotLayout::canvasMargin(), QwtPlotLayout::canvasRect(), QwtScaleWidget::endBorderDist(), QwtScaleDiv::hBound(), QwtLegend::isEmpty(), QwtScaleDiv::lBound(), legend(), margin(), QwtScaleWidget::margin(), QwtPainter::metricsMap(), QwtPlotPrintFilter::options(), plotLayout(), printCanvas(), printLegend(), printScale(), printTitle(), QwtPlotPrintFilter::reset(), QwtPainter::resetMetricsMap(), QwtPlotLayout::scaleRect(), QwtScaleWidget::setMargin(), QwtPainter::setMetricsMap(), QwtScaleMap::setPaintXInterval(), QwtScaleMap::setScaleInterval(), QwtScaleWidget::startBorderDist(), and titleLabel().

QwtPlotLayout * QwtPlot::plotLayout ()

Returns:

the plot's title

Definition at line 228 of file qwt_plot.cpp.

Referenced by canvasMap(), and print().

const QwtPlotLayout * QwtPlot::plotLayout () const

Returns:

the plot's titel label.

Definition at line 234 of file qwt_plot.cpp.

void QwtPlot::setMargin (int margin)

Change the margin of the plot. The margin is the space around all components.

Parameters:

margin new margin

See also:

QwtPlotLayout::setMargin(), margin(), plotLayout()

Definition at line 665 of file qwt_plot.cpp.

References updateLayout().

int QwtPlot::margin () const

Returns:

margin

See also:

setMargin(), QwtPlotLayout::margin(), plotLayout()

Definition at line 681 of file qwt_plot.cpp.

Referenced by canvasMap(), and print().

void QwtPlot::setTitle (const QString & title)

Change the plot's title

Parameters:

title New title

Definition at line 199 of file qwt_plot.cpp.

References updateLayout().

Referenced by applyProperties().

void QwtPlot::setTitle (const QwtText & title)

Change the plot's title

Parameters:

title New title

Definition at line 212 of file qwt_plot.cpp.

References title(), and updateLayout().

QwtText QwtPlot::title () const

Returns:

the plot's title

Definition at line 222 of file qwt_plot.cpp.

Referenced by grabProperties(), QwtPlot(), setAxisTitle(), and setTitle().

QwtTextLabel * QwtPlot::titleLabel ()

Returns:

the plot's titel label.

Definition at line 240 of file qwt_plot.cpp.

Referenced by QwtPlotPrintFilter::apply(), print(), printTitle(), and QwtPlotPrintFilter::reset().

const QwtTextLabel * QwtPlot::titleLabel () const

Returns:

the plot's titel label.

Definition at line 248 of file qwt_plot.cpp.

QwtPlotCanvas * QwtPlot::canvas ()

Returns:

the plot's canvas

Definition at line 275 of file qwt_plot.cpp.

Referenced by canvasBackground(), canvasLineWidth(), QwtPlotCurve::draw(), QwtPlotLayout::minimumSizeHint(), printCanvas(), replot(), setCanvasBackground(), and setCanvasLineWidth().

const QwtPlotCanvas * QwtPlot::canvas () const

Returns:

the plot's canvas

Definition at line 283 of file qwt_plot.cpp.

void QwtPlot::setCanvasBackground (const QColor & c)

Change the background of the plotting area.

Sets c to QColorGroup::Background of all colorgroups of the palette of the canvas. Using canvas()->setPalette() is a more powerful way to set these colors.

Parameters:

c new background color

Definition at line 694 of file qwt_plot.cpp.

References canvas().

Referenced by QwtPlotPrintFilter::apply(), and QwtPlotPrintFilter::reset().

const QColor & QwtPlot::canvasBackground () const

Nothing else than: canvas()->palette().color( QPalette::Normal, QColorGroup::Background);

Returns:

the background color of the plotting area.

Definition at line 716 of file qwt_plot.cpp.

References canvas().

Referenced by QwtPlotPrintFilter::apply().

void QwtPlot::setCanvasLineWidth (int w)

Change the border width of the plotting area Nothing else than canvas()->setLineWidth(w), left for compatibility only.

Parameters:

w new border width

Definition at line 733 of file qwt_plot.cpp.

References canvas(), and updateLayout().

int QwtPlot::canvasLineWidth () const

Nothing else than: canvas()->lineWidth(), left for compatibility only.

Returns:

the border width of the plotting area

Definition at line 744 of file qwt_plot.cpp.

References canvas().

QwtScaleMap QwtPlot::canvasMap (int axisId) const [virtual]

Parameters:

axisId Axis

Returns:

Map for the axis on the canvas. With this map pixel coordinates can translated to plot coordinates and vice versa.

See also:

QwtScaleMap, transform(), invTransform()

Definition at line 612 of file qwt_plot.cpp.

References axisEnabled(), axisScaleDiv(), axisScaleEngine(), axisWidget(), QwtPlotLayout::canvasMargin(), QwtScaleWidget::endBorderDist(), QwtScaleDiv::hBound(), QwtScaleDiv::lBound(), margin(), plotLayout(), QwtScaleMap::setPaintInterval(), QwtScaleMap::setScaleInterval(), QwtScaleMap::setTransformation(), and QwtScaleWidget::startBorderDist().

Referenced by QwtPlotCurve::closestPoint(), QwtPlotCurve::draw(), drawCanvas(), QwtPlotPicker::invTransform(), invTransform(), QwtPlotPanner::moveCanvas(), QwtPlotPicker::transform(), and transform().

double QwtPlot::invTransform (int axisId, int pos) const

Transform the x or y coordinate of a position in the drawing region into a value.

Parameters:

axisId axis index
pos position

Warning:

The position can be an x or a y coordinate, depending on the specified axis.

Definition at line 349 of file qwt_plot_axis.cpp.

References axisValid(), and canvasMap().

int QwtPlot::transform (int axisId, double value) const

Transform a value into a coordinate in the plotting region.

Parameters:

axisId axis index
value value

Returns:

X or y coordinate in the plotting region corresponding to the value.

Definition at line 365 of file qwt_plot_axis.cpp.

References axisValid(), and canvasMap().

QwtScaleEngine * QwtPlot::axisScaleEngine (int axisId)

Returns:

Scale engine for a specific axis

Definition at line 144 of file qwt_plot_axis.cpp.

References axisValid().

Referenced by canvasMap(), and print().

const QwtScaleEngine * QwtPlot::axisScaleEngine (int axisId) const

Returns:

Scale engine for a specific axis

Definition at line 153 of file qwt_plot_axis.cpp.

References axisValid().

void QwtPlot::setAxisScaleEngine (int axisId, QwtScaleEngine * scaleEngine)

Change the scale engine for an axis

Parameters:

axisId axis index
scaleEngine Scale engine

See also:

axisScaleEngine()

Definition at line 128 of file qwt_plot_axis.cpp.

References autoRefresh(), and axisValid().

void QwtPlot::setAxisAutoScale (int axisId)

Enable autoscaling for a specified axis.

This member function is used to switch back to autoscaling mode after a fixed scale has been set. Autoscaling is enabled by default.

Parameters:

axisId axis index

See also:

QwtPlot::setAxisScale(), QwtPlot::setAxisScaleDiv()

Definition at line 396 of file qwt_plot_axis.cpp.

References autoRefresh(), and axisValid().

bool QwtPlot::axisAutoScale (int axisId) const

Returns:

true if autoscaling is enabled

Parameters:

axisId axis index

Definition at line 164 of file qwt_plot_axis.cpp.

References axisValid().

Referenced by updateAxes().

void QwtPlot::enableAxis (int axisId, bool tf = true)

Enable or disable a specified axis.

When an axis is disabled, this only means that it is not visible on the screen. Curves, markers and can be attached to disabled axes, and transformation of screen coordinates into values works as normal.

Only xBottom and yLeft are enabled by default.

Parameters:

axisId axis index
tf true (enabled) or false (disabled)

Definition at line 332 of file qwt_plot_axis.cpp.

References axisValid(), and updateLayout().

bool QwtPlot::axisEnabled (int axisId) const

Returns:

true if a specified axis is enabled

Parameters:

axisId axis index

Definition at line 177 of file qwt_plot_axis.cpp.

References axisValid().

Referenced by canvasMap(), QwtPlotLayout::minimumSizeHint(), print(), printScale(), QwtPlotPicker::QwtPlotPicker(), sizeHint(), and updateLayout().

void QwtPlot::setAxisFont (int axisId, const QFont & f)

Change the font of an axis.

Parameters:

axisId axis index
f font

Warning:

This function changes the font of the tick labels, not of the axis title.

Definition at line 381 of file qwt_plot_axis.cpp.

References axisValid(), and axisWidget().

QFont QwtPlot::axisFont (int axisId) const

Returns:

the font of the scale labels for a specified axis

Parameters:

axisId axis index

Definition at line 189 of file qwt_plot_axis.cpp.

References axisValid(), and axisWidget().

void QwtPlot::setAxisScale (int axisId, double min, double max, double stepSize = 0)

Disable autoscaling and specify a fixed scale for a selected axis.

Parameters:

axisId axis index
min
max minimum and maximum of the scale
stepSize Major step size. If step == 0, the step size is calculated automatically using the maxMajor setting.

See also:

setAxisMaxMajor(), setAxisAutoScale()

Definition at line 414 of file qwt_plot_axis.cpp.

References autoRefresh(), and axisValid().

Referenced by QwtPlotPanner::moveCanvas(), QwtPlotZoomer::rescale(), and QwtPlotMagnifier::rescale().

void QwtPlot::setAxisScaleDiv (int axisId, const QwtScaleDiv & scaleDiv)

Disable autoscaling and specify a fixed scale for a selected axis.

Parameters:

axisId axis index
scaleDiv Scale division

See also:

setAxisScale(), setAxisAutoScale()

Definition at line 437 of file qwt_plot_axis.cpp.

References autoRefresh(), and axisValid().

void QwtPlot::setAxisScaleDraw (int axisId, QwtScaleDraw * scaleDraw)

Set a scale draw.

Parameters:

axisId axis index
scaleDraw object responsible for drawing scales.

By passing scaleDraw it is possible to extend QwtScaleDraw functionality and let it take place in QwtPlot. Please note that scaleDraw has to be created with new and will be deleted by the corresponding QwtScale member ( like a child object ).

See also:

QwtScaleDraw, QwtScaleWidget

Warning:

The attributes of scaleDraw will be overwritten by those of the previous QwtScaleDraw.

Definition at line 465 of file qwt_plot_axis.cpp.

References autoRefresh(), axisValid(), axisWidget(), and QwtScaleWidget::setScaleDraw().

double QwtPlot::axisStepSize (int axisId) const

Return the step size parameter, that has been set in setAxisScale. This doesn't need to be the step size of the current scale.

Parameters:

axisId axis index

Returns:

step size parameter value

See also:

setAxisScale

Definition at line 300 of file qwt_plot_axis.cpp.

References axisValid().

const QwtScaleDiv * QwtPlot::axisScaleDiv (int axisId) const

Return the scale division of a specified axis.

axisScaleDiv(axisId)->lBound(), axisScaleDiv(axisId)->hBound() are the current limits of the axis scale.

Parameters:

axisId axis index

Returns:

Scale division

See also:

QwtScaleDiv, setAxisScaleDiv

Definition at line 235 of file qwt_plot_axis.cpp.

References axisValid().

Referenced by canvasMap(), QwtPlotPanner::moveCanvas(), print(), QwtPlotZoomer::rescale(), QwtPlotMagnifier::rescale(), QwtPlotPicker::scaleRect(), QwtPlotScaleItem::setScaleDivFromAxis(), QwtPlotScaleItem::setScaleDraw(), and updateAxes().

QwtScaleDiv * QwtPlot::axisScaleDiv (int axisId)

Return the scale division of a specified axis.

axisScaleDiv(axisId)->lBound(), axisScaleDiv(axisId)->hBound() are the current limits of the axis scale.

Parameters:

axisId axis index

Returns:

Scale division

See also:

QwtScaleDiv, setAxisScaleDiv

Definition at line 254 of file qwt_plot_axis.cpp.

References axisValid().

const QwtScaleDraw * QwtPlot::axisScaleDraw (int axisId) const

Returns:

the scale draw of a specified axis

Parameters:

axisId axis index

Returns:

specified scaleDraw for axis, or NULL if axis is invalid.

See also:

QwtScaleDraw

Definition at line 268 of file qwt_plot_axis.cpp.

References axisValid(), axisWidget(), and QwtScaleWidget::scaleDraw().

QwtScaleDraw * QwtPlot::axisScaleDraw (int axisId)

Returns:

the scale draw of a specified axis

Parameters:

axisId axis index

Returns:

specified scaleDraw for axis, or NULL if axis is invalid.

See also:

QwtScaleDraw

Definition at line 282 of file qwt_plot_axis.cpp.

References axisValid(), axisWidget(), and QwtScaleWidget::scaleDraw().

const QwtScaleWidget * QwtPlot::axisWidget (int axisId) const

Returns:

specified axis, or NULL if axisId is invalid.

Parameters:

axisId axis index

Definition at line 100 of file qwt_plot_axis.cpp.

References axisValid().

Referenced by QwtPlotPrintFilter::apply(), axisFont(), axisScaleDraw(), axisTitle(), canvasMap(), QwtPlotLayout::minimumSizeHint(), print(), printScale(), QwtPlotPrintFilter::reset(), setAxisFont(), setAxisLabelRotation(), setAxisScaleDraw(), setAxisTitle(), sizeHint(), updateAxes(), and updateLayout().

QwtScaleWidget * QwtPlot::axisWidget (int axisId)

Returns:

specified axis, or NULL if axisId is invalid.

Parameters:

axisId axis index

Definition at line 112 of file qwt_plot_axis.cpp.

References axisValid().

void QwtPlot::setAxisLabelAlignment (int axisId, Qt::Alignment alignment)

Change the alignment of the tick labels

Parameters:

axisId axis index
alignment Or'd Qt::AlignmentFlags <see qnamespace.h>

See also:

QwtScaleDraw::setLabelAlignment()

Definition at line 483 of file qwt_plot_axis.cpp.

void QwtPlot::setAxisLabelRotation (int axisId, double rotation)

Rotate all tick labels

Parameters:

axisId axis index
rotation Angle in degrees. When changing the label rotation, the label alignment might be adjusted too.

See also:

QwtScaleDraw::setLabelRotation(), QwtPlot::setAxisLabelAlignment

Definition at line 497 of file qwt_plot_axis.cpp.

References axisValid(), axisWidget(), and QwtScaleWidget::setLabelRotation().

void QwtPlot::setAxisTitle (int axisId, const QString & title)

Change the title of a specified axis.

Parameters:

axisId axis index
title axis title

Definition at line 561 of file qwt_plot_axis.cpp.

References axisValid(), axisWidget(), and QwtScaleWidget::setTitle().

void QwtPlot::setAxisTitle (int axisId, const QwtText & title)

Change the title of a specified axis.

Parameters:

axisId axis index
title axis title

Definition at line 572 of file qwt_plot_axis.cpp.

References axisValid(), axisWidget(), QwtScaleWidget::setTitle(), and title().

QwtText QwtPlot::axisTitle (int axisId) const

Returns:

the title of a specified axis

Parameters:

axisId axis index

Definition at line 312 of file qwt_plot_axis.cpp.

References axisValid(), axisWidget(), and QwtScaleWidget::title().

void QwtPlot::setAxisMaxMinor (int axisId, int maxMinor)

Set the maximum number of minor scale intervals for a specified axis

Parameters:

axisId axis index
maxMinor maximum number of minor steps

See also:

axisMaxMinor()

Definition at line 510 of file qwt_plot_axis.cpp.

References autoRefresh(), and axisValid().

int QwtPlot::axisMaxMajor (int axisId) const

Returns:

the maximum number of major ticks for a specified axis

Parameters:

axisId axis index sa setAxisMaxMajor()

Definition at line 203 of file qwt_plot_axis.cpp.

References axisValid().

void QwtPlot::setAxisMaxMajor (int axisId, int maxMajor)

Set the maximum number of major scale intervals for a specified axis

Parameters:

axisId axis index
maxMajor maximum number of major steps

See also:

axisMaxMajor()

Definition at line 537 of file qwt_plot_axis.cpp.

References autoRefresh(), and axisValid().

int QwtPlot::axisMaxMinor (int axisId) const

Returns:

the maximum number of minor ticks for a specified axis

Parameters:

axisId axis index sa setAxisMaxMinor()

Definition at line 216 of file qwt_plot_axis.cpp.

References axisValid().

void QwtPlot::insertLegend (QwtLegend * legend, QwtPlot::LegendPosition pos = QwtPlot::RightLegend, double ratio = -1.0)

Insert a legend.

If the position legend is QwtPlot::LeftLegend or QwtPlot::RightLegend the legend will be organized in one column from top to down. Otherwise the legend items will be placed in a table with a best fit number of columns from left to right.

If pos != QwtPlot::ExternalLegend the plot widget will become parent of the legend. It will be deleted when the plot is deleted, or another legend is set with insertLegend().

Parameters:

legend Legend
pos The legend's position. For top/left position the number of colums will be limited to 1, otherwise it will be set to unlimited.
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:

legend(), QwtPlotLayout::legendPosition(), QwtPlotLayout::setLegendPosition()

Definition at line 822 of file qwt_plot.cpp.

References QwtPlotDict::itemList(), legend(), updateLayout(), and updateTabOrder().

QwtLegend * QwtPlot::legend ()

Returns:

the plot's legend

See also:

insertLegend()

Definition at line 257 of file qwt_plot.cpp.

Referenced by QwtPlotLayout::activate(), QwtPlotPrintFilter::apply(), insertLegend(), print(), printLegend(), and QwtPlotPrintFilter::reset().

const QwtLegend * QwtPlot::legend () const

Returns:

the plot's legend

See also:

insertLegend()

Definition at line 266 of file qwt_plot.cpp.

void QwtPlot::polish () [virtual]

Polish.

Definition at line 289 of file qwt_plot.cpp.

References replot().

Referenced by event().

QSize QwtPlot::sizeHint () const [virtual]

Return sizeHint

See also:

minimumSizeHint()

Definition at line 303 of file qwt_plot.cpp.

References axisEnabled(), axisWidget(), minimumSizeHint(), QwtScaleWidget::minimumSizeHint(), QwtAbstractScaleDraw::scaleDiv(), QwtScaleWidget::scaleDraw(), and QwtScaleDiv::ticks().

QSize QwtPlot::minimumSizeHint () const [virtual]

Return a minimum size hint.

Definition at line 338 of file qwt_plot.cpp.

Referenced by sizeHint().

void QwtPlot::updateLayout () [virtual]

Adjust plot content to its current size.

See also:

resizeEvent()

Definition at line 413 of file qwt_plot.cpp.

References axisEnabled(), and axisWidget().

Referenced by enableAxis(), event(), insertLegend(), resizeEvent(), setCanvasLineWidth(), setMargin(), and setTitle().

bool QwtPlot::event (QEvent *) [virtual]

Adds handling of layout requests.

Definition at line 140 of file qwt_plot.cpp.

References polish(), and updateLayout().

void QwtPlot::legendClicked (QwtPlotItem * plotItem) [signal]

A signal which is emitted when the user has clicked on a legend item, which is in QwtLegend::ClickableItem mode.

Parameters:

plotItem Corresponding plot item of the selected legend item

Note:

clicks are disabled as default

See also:

QwtLegend::setItemMode, QwtLegend::itemMode

Referenced by legendItemClicked().

void QwtPlot::legendChecked (QwtPlotItem * plotItem, bool on) [signal]

A signal which is emitted when the user has clicked on a legend item, which is in QwtLegend::CheckableItem mode

Parameters:

plotItem Corresponding plot item of the selected legend item
on True when the legen item is checked

Note:

clicks are disabled as default

See also:

QwtLegend::setItemMode, QwtLegend::itemMode

Referenced by legendItemChecked().

void QwtPlot::clear () [virtual, slot]

Remove all curves and markers.

Definition at line 789 of file qwt_plot.cpp.

References QwtPlotDict::detachItems().

void QwtPlot::replot () [virtual, slot]

Redraw the plot.

If the autoReplot option is not set (which is the default) or if any curves are attached to raw data, the plot has to be refreshed explicitly in order to make changes visible.

See also:

setAutoReplot()

Warning:

Calls canvas()->repaint, take care of infinite recursions

Definition at line 363 of file qwt_plot.cpp.

References autoReplot(), canvas(), QwtPlotCanvas::invalidatePaintCache(), setAutoReplot(), QwtPlotCanvas::testPaintAttribute(), and updateAxes().

Referenced by applyProperties(), autoRefresh(), QwtPlotPanner::moveCanvas(), polish(), QwtPlotZoomer::rescale(), QwtPlotMagnifier::rescale(), and QwtPlotZoomer::setZoomBase().

void QwtPlot::autoRefresh () [slot]

Replots the plot if QwtPlot::autoReplot() is true.

Definition at line 163 of file qwt_plot.cpp.

References replot().

Referenced by setAxisAutoScale(), setAxisMaxMajor(), setAxisMaxMinor(), setAxisScale(), setAxisScaleDiv(), setAxisScaleDraw(), and setAxisScaleEngine().

void QwtPlot::legendItemClicked () [protected, virtual, slot]

Called internally when the legend has been clicked on. Emits a legendClicked() signal.

Definition at line 762 of file qwt_plot.cpp.

References legendClicked().

void QwtPlot::legendItemChecked (bool on) [protected, virtual, slot]

Called internally when the legend has been checked Emits a legendClicked() signal.

Definition at line 777 of file qwt_plot.cpp.

References legendChecked().

bool QwtPlot::axisValid (int axisId) [static, protected]

Returns:

true if the specified axis exists, otherwise false

Parameters:

axisId axis index

Definition at line 753 of file qwt_plot.cpp.

Referenced by axisAutoScale(), axisEnabled(), axisFont(), axisMaxMajor(), axisMaxMinor(), axisScaleDiv(), axisScaleDraw(), axisScaleEngine(), axisStepSize(), axisTitle(), axisWidget(), enableAxis(), invTransform(), setAxisAutoScale(), setAxisFont(), setAxisLabelRotation(), setAxisMaxMajor(), setAxisMaxMinor(), setAxisScale(), setAxisScaleDiv(), setAxisScaleDraw(), setAxisScaleEngine(), setAxisTitle(), and transform().

void QwtPlot::drawCanvas (QPainter * painter) [protected, virtual]

Redraw the canvas.

Parameters:

painter Painter used for drawing

Warning:

drawCanvas calls drawItems what is also used for printing. Applications that like to add individual plot items better overload drawItems()

See also:

drawItems()

Definition at line 554 of file qwt_plot.cpp.

References canvasMap(), and drawItems().

void QwtPlot::drawItems (QPainter * painter, const QRect & rect, const QwtScaleMap map[axisCnt], const QwtPlotPrintFilter & pfilter) const [protected, virtual]

Redraw the canvas items.

Parameters:

painter Painter used for drawing
rect Bounding rectangle where to paint
map QwtPlot::axisCnt maps, mapping between plot and paint device coordinates
pfilter Plot print filter

Definition at line 572 of file qwt_plot.cpp.

References QwtPlotDict::itemList(), and QwtPlotPrintFilter::options().

Referenced by drawCanvas(), and printCanvas().

void QwtPlot::updateTabOrder () [protected, virtual]

Update the focus tab order

The order is changed so that the canvas will be in front of the first legend item, or behind the last legend item - depending on the position of the legend.

Definition at line 477 of file qwt_plot.cpp.

Referenced by insertLegend().

void QwtPlot::updateAxes () [protected]

Rebuild the scales.

Definition at line 579 of file qwt_plot_axis.cpp.

References axisAutoScale(), axisScaleDiv(), axisWidget(), QwtScaleWidget::getBorderDistHint(), QwtDoubleInterval::isValid(), QwtPlotDict::itemList(), QwtDoubleInterval::maxValue(), QwtDoubleInterval::minValue(), QwtScaleWidget::setBorderDist(), and QwtScaleWidget::setScaleDiv().

Referenced by replot().

void QwtPlot::resizeEvent (QResizeEvent * e) [protected, virtual]

Resize and update internal layout.

Definition at line 347 of file qwt_plot.cpp.

References updateLayout().

void QwtPlot::printLegendItem (QPainter * painter, const QWidget * w, const QRect & rect) const [protected, virtual]

Print the legend item into a given rectangle.

Parameters:

painter Painter
w Widget representing a legend item
rect Bounding rectangle

Definition at line 335 of file qwt_plot_print.cpp.

Referenced by printLegend().

void QwtPlot::printTitle (QPainter * painter, const QRect & rect) const [protected, virtual]

Print the title into a given rectangle.

Parameters:

painter Painter
rect Bounding rectangle

Definition at line 256 of file qwt_plot_print.cpp.

References QwtText::draw(), QwtTextLabel::text(), and titleLabel().

Referenced by print().

void QwtPlot::printScale (QPainter * painter, int axisId, int startDist, int endDist, int baseDist, const QRect & rect) const [protected, virtual]

Paint a scale into a given rectangle. Paint the scale into a given rectangle.

Parameters:

painter Painter
axisId Axis
startDist Start border distance
endDist End border distance
baseDist Base distance
rect Bounding rectangle

Definition at line 359 of file qwt_plot_print.cpp.

References axisEnabled(), axisWidget(), QwtScaleWidget::colorBarRect(), QwtScaleWidget::colorBarWidth(), QwtAbstractScaleDraw::draw(), QwtScaleWidget::drawColorBar(), QwtScaleWidget::drawTitle(), QwtScaleWidget::isColorBarEnabled(), QwtMetricsMap::layoutToScreen(), QwtScaleDraw::length(), QwtPainter::metricsMap(), QwtScaleDraw::move(), QwtScaleDraw::orientation(), QwtScaleWidget::penWidth(), QwtScaleDraw::pos(), QwtScaleWidget::scaleDraw(), QwtScaleDraw::setLength(), and QwtScaleWidget::spacing().

Referenced by print().

void QwtPlot::printCanvas (QPainter * painter, const QRect & boundingRect, const QRect & canvasRect, const QwtScaleMap map[axisCnt], const QwtPlotPrintFilter & pfilter) const [protected, virtual]

Print the canvas into a given rectangle.

Parameters:

painter Painter
map Maps mapping between plot and paint device coordinates
boundingRect Bounding rectangle
canvasRect Canvas rectangle
pfilter Print filter

See also:

QwtPlotPrintFilter

Definition at line 467 of file qwt_plot_print.cpp.

References canvas(), drawItems(), QwtPainter::drawRect(), QwtPainter::fillRect(), QwtPlotPrintFilter::options(), and QwtPainter::setClipRect().

Referenced by print().

void QwtPlot::printLegend (QPainter * painter, const QRect & rect) const [protected, virtual]

Print the legend into a given rectangle.

Parameters:

painter Painter
rect Bounding rectangle

Definition at line 280 of file qwt_plot_print.cpp.

References QwtDynGridLayout::columnsForWidth(), QwtLegend::contentsWidget(), QwtDynGridLayout::count(), QwtDynGridLayout::itemAt(), QwtDynGridLayout::layoutItems(), legend(), printLegendItem(), and QwtPainter::setClipRect().

Referenced by print().

Author

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