Classes | Public Types | Public Member Functions | Protected Member Functions | Private Member Functions | Private Attributes | List of all members
QwtPlotBarChart Class Reference

QwtPlotBarChart displays a series of a values as bars. More...

#include <qwt_plot_barchart.h>

Inheritance diagram for QwtPlotBarChart:
Inheritance graph
[legend]

Classes

class  PrivateData
 

Public Types

enum  LegendMode { LegendChartTitle, LegendBarTitles }
 Legend modes. More...
 
- Public Types inherited from QwtPlotAbstractBarChart
enum  LayoutPolicy { AutoAdjustSamples, ScaleSamplesToAxes, ScaleSampleToCanvas, FixedSampleSize }
 Mode how to calculate the bar width. More...
 
- Public Types inherited from QwtPlotItem
enum  ItemAttribute { Legend = 0x01, AutoScale = 0x02, Margins = 0x04 }
 Plot Item Attributes. More...
 
typedef QFlags< ItemAttributeItemAttributes
 Plot Item Attributes. More...
 
enum  ItemInterest { ScaleInterest = 0x01, LegendInterest = 0x02 }
 Plot Item Interests. More...
 
typedef QFlags< ItemInterestItemInterests
 Plot Item Interests. More...
 
enum  RenderHint { RenderAntialiased = 0x1 }
 Render hints. More...
 
typedef QFlags< RenderHintRenderHints
 Render hints. More...
 
enum  RttiValues {
  Rtti_PlotItem = 0, Rtti_PlotGrid, Rtti_PlotScale, Rtti_PlotLegend,
  Rtti_PlotMarker, Rtti_PlotCurve, Rtti_PlotSpectroCurve, Rtti_PlotIntervalCurve,
  Rtti_PlotHistogram, Rtti_PlotSpectrogram, Rtti_PlotSVG, Rtti_PlotTradingCurve,
  Rtti_PlotBarChart, Rtti_PlotMultiBarChart, Rtti_PlotShape, Rtti_PlotTextLabel,
  Rtti_PlotZone, Rtti_PlotUserItem = 1000
}
 Runtime type information. More...
 

Public Member Functions

virtual QwtText barTitle (int sampleIndex) const
 Return the title of a bar. More...
 
virtual QRectF boundingRect () const
 
virtual void drawSeries (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
 
LegendMode legendMode () const
 
 QwtPlotBarChart (const QString &title=QString())
 
 QwtPlotBarChart (const QwtText &title)
 
virtual int rtti () const
 
void setLegendMode (LegendMode)
 
void setSamples (const QVector< QPointF > &)
 
void setSamples (const QVector< double > &)
 
void setSamples (QwtSeriesData< QPointF > *series)
 
void setSymbol (QwtColumnSymbol *)
 Assign a symbol. More...
 
virtual QwtColumnSymbolspecialSymbol (int sampleIndex, const QPointF &) const
 
const QwtColumnSymbolsymbol () const
 
virtual ~QwtPlotBarChart ()
 Destructor. More...
 
- Public Member Functions inherited from QwtPlotAbstractBarChart
double baseline () const
 
virtual void getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, double &left, double &top, double &right, double &bottom) const
 Calculate a hint for the canvas margin. More...
 
double layoutHint () const
 
LayoutPolicy layoutPolicy () const
 
int margin () const
 
 QwtPlotAbstractBarChart (const QwtText &title)
 
void setBaseline (double)
 Set the baseline. More...
 
void setLayoutHint (double)
 
void setLayoutPolicy (LayoutPolicy)
 
void setMargin (int)
 Set the margin. More...
 
void setSpacing (int)
 Set the spacing. More...
 
int spacing () const
 
virtual ~QwtPlotAbstractBarChart ()
 Destructor. More...
 
- Public Member Functions inherited from QwtPlotSeriesItem
virtual void draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &) const
 Draw the complete series. More...
 
Qt::Orientation orientation () const
 
 QwtPlotSeriesItem (const QString &title=QString())
 
 QwtPlotSeriesItem (const QwtText &title)
 
void setOrientation (Qt::Orientation)
 
virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
 Update the item to changes of the axes scale division. More...
 
virtual ~QwtPlotSeriesItem ()
 Destructor. More...
 
- Public Member Functions inherited from QwtPlotItem
void attach (QwtPlot *plot)
 Attach the item to a plot. More...
 
void detach ()
 This method detaches a QwtPlotItem from any QwtPlot it has been associated with. More...
 
void hide ()
 Hide the item. More...
 
bool isVisible () const
 
virtual void itemChanged ()
 
virtual void legendChanged ()
 
QSize legendIconSize () const
 
QRectF paintRect (const QwtScaleMap &, const QwtScaleMap &) const
 Calculate the bounding paint rectangle of 2 maps. More...
 
QwtPlotplot () const
 Return attached plot. More...
 
 QwtPlotItem (const QwtText &title=QwtText())
 
uint renderThreadCount () const
 
QRectF scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
 Calculate the bounding scale rectangle of 2 maps. More...
 
void setAxes (int xAxis, int yAxis)
 
void setItemAttribute (ItemAttribute, bool on=true)
 
void setItemInterest (ItemInterest, bool on=true)
 
void setLegendIconSize (const QSize &)
 
void setRenderHint (RenderHint, bool on=true)
 
void setRenderThreadCount (uint numThreads)
 
void setTitle (const QString &title)
 
void setTitle (const QwtText &title)
 
virtual void setVisible (bool)
 
void setXAxis (int axis)
 
void setYAxis (int axis)
 
void setZ (double z)
 Set the z value. More...
 
void show ()
 Show the item. More...
 
bool testItemAttribute (ItemAttribute) const
 
bool testItemInterest (ItemInterest) const
 
bool testRenderHint (RenderHint) const
 
const QwtTexttitle () const
 
virtual void updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &)
 Update the item to changes of the legend info. More...
 
int xAxis () const
 Return xAxis. More...
 
int yAxis () const
 Return yAxis. More...
 
double z () const
 
virtual ~QwtPlotItem ()
 Destroy the QwtPlotItem. More...
 
- Public Member Functions inherited from QwtSeriesStore< QPointF >
QwtSeriesData< QPointF > * data ()
 
const QwtSeriesData< QPointF > * data () const
 
virtual QRectF dataRect () const
 
virtual size_t dataSize () const
 
 QwtSeriesStore ()
 Constructor The store contains no series. More...
 
QPointF sample (int index) const
 
void setData (QwtSeriesData< QPointF > *series)
 
virtual void setRectOfInterest (const QRectF &rect)
 
QwtSeriesData< QPointF > * swapData (QwtSeriesData< QPointF > *series)
 
 ~QwtSeriesStore ()
 Destructor. More...
 

Protected Member Functions

QwtColumnRect columnRect (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, const QwtInterval &boundingInterval, const QPointF &sample) const
 
virtual void drawBar (QPainter *, int sampleIndex, const QPointF &point, const QwtColumnRect &) const
 
virtual void drawSample (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, const QwtInterval &boundingInterval, int index, const QPointF &sample) const
 
QList< QwtLegendDatalegendData () const
 Return all information, that is needed to represent the item on the legend. More...
 
QwtGraphic legendIcon (int index, const QSizeF &) const
 
- Protected Member Functions inherited from QwtPlotAbstractBarChart
double sampleWidth (const QwtScaleMap &map, double canvasSize, double dataSize, double value) const
 
- Protected Member Functions inherited from QwtPlotSeriesItem
virtual void dataChanged ()
 dataChanged() indicates, that the series has been changed. More...
 
- Protected Member Functions inherited from QwtPlotItem
QwtGraphic defaultIcon (const QBrush &, const QSizeF &) const
 Return a default icon from a brush. More...
 
- Protected Member Functions inherited from QwtAbstractSeriesStore
virtual ~QwtAbstractSeriesStore ()
 Destructor. More...
 

Private Member Functions

void init ()
 

Private Attributes

PrivateDatad_data
 

Detailed Description

QwtPlotBarChart displays a series of a values as bars.

Each bar might be customized individually by implementing a specialSymbol(). Otherwise it is rendered using a default symbol.

Depending on its orientation() the bars are displayed horizontally or vertically. The bars cover the interval between the baseline() and the value.

By activating the LegendBarTitles mode each sample will have its own entry on the legend.

The most common use case of a bar chart is to display a list of y coordinates, where the x coordinate is simply the index in the list. But for other situations ( f.e. when values are related to dates ) it is also possible to set x coordinates explicitly.

See also
QwtPlotMultiBarChart, QwtPlotHistogram, QwtPlotCurve::Sticks, QwtPlotSeriesItem::orientation(), QwtPlotAbstractBarChart::baseline()

Definition at line 41 of file qwt_plot_barchart.h.

Member Enumeration Documentation

Legend modes.

The default setting is QwtPlotBarChart::LegendChartTitle.

See also
setLegendMode(), legendMode()
Enumerator
LegendChartTitle 

One entry on the legend showing the default symbol and the title() of the chart

See also
QwtPlotItem::title()
LegendBarTitles 

One entry for each value showing the individual symbol of the corresponding bar and the bar title.

See also
specialSymbol(), barTitle()

Definition at line 51 of file qwt_plot_barchart.h.

Constructor & Destructor Documentation

QwtPlotBarChart::QwtPlotBarChart ( const QString &  title = QString())
explicit

Constructor

Parameters
titleTitle of the curve

Definition at line 48 of file qwt_plot_barchart.cpp.

QwtPlotBarChart::QwtPlotBarChart ( const QwtText title)
explicit

Constructor

Parameters
titleTitle of the curve

Definition at line 38 of file qwt_plot_barchart.cpp.

QwtPlotBarChart::~QwtPlotBarChart ( )
virtual

Destructor.

Definition at line 55 of file qwt_plot_barchart.cpp.

Member Function Documentation

QwtText QwtPlotBarChart::barTitle ( int  sampleIndex) const
virtual

Return the title of a bar.

In LegendBarTitles mode the title is displayed on the legend entry corresponding to a bar.

The default implementation is a dummy, that is intended to be overloaded.

Parameters
sampleIndexIndex of the bar
Returns
An empty text
See also
LegendBarTitles

Definition at line 396 of file qwt_plot_barchart.cpp.

QRectF QwtPlotBarChart::boundingRect ( ) const
virtual
Returns
Bounding rectangle of all samples. For an empty series the rectangle is invalid.

Reimplemented from QwtPlotSeriesItem.

Definition at line 183 of file qwt_plot_barchart.cpp.

QwtColumnRect QwtPlotBarChart::columnRect ( const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
const QwtInterval boundingInterval,
const QPointF &  sample 
) const
protected

Calculate the geometry of a bar in widget coordinates

Parameters
xMapx map
yMapy map
canvasRectContents rect of the canvas
boundingIntervalBounding interval of sample values
sampleValue of the sample
Returns
Geometry of the column

Definition at line 259 of file qwt_plot_barchart.cpp.

void QwtPlotBarChart::drawBar ( QPainter *  painter,
int  sampleIndex,
const QPointF &  sample,
const QwtColumnRect rect 
) const
protectedvirtual

Draw a bar

Parameters
painterPainter
sampleIndexIndex of the sample represented by the bar
sampleValue of the sample
rectBounding rectangle of the bar

Definition at line 338 of file qwt_plot_barchart.cpp.

void QwtPlotBarChart::drawSample ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
const QwtInterval boundingInterval,
int  index,
const QPointF &  sample 
) const
protectedvirtual

Draw a sample

Parameters
painterPainter
xMapx map
yMapy map
canvasRectContents rect of the canvas
boundingIntervalBounding interval of sample values
indexIndex of the sample
sampleValue of the sample
See also
drawSeries()

Definition at line 319 of file qwt_plot_barchart.cpp.

void QwtPlotBarChart::drawSeries ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
int  from,
int  to 
) const
virtual

Draw an interval of the bar chart

Parameters
painterPainter
xMapMaps x-values into pixel coordinates.
yMapMaps y-values into pixel coordinates.
canvasRectContents rect of the canvas
fromIndex of the first point to be painted
toIndex of the last point to be painted. If to < 0 the curve will be painted to its last point.
See also
drawSymbols()

Implements QwtPlotSeriesItem.

Definition at line 220 of file qwt_plot_barchart.cpp.

void QwtPlotBarChart::init ( )
private

Definition at line 60 of file qwt_plot_barchart.cpp.

QList< QwtLegendData > QwtPlotBarChart::legendData ( ) const
protectedvirtual

Return all information, that is needed to represent the item on the legend.

In case of LegendBarTitles an entry for each bar is returned, otherwise the chart is represented like any other plot item from its title() and the legendIcon().

Returns
Information, that is needed to represent the item on the legend
See also
title(), setLegendMode(), barTitle(), QwtLegend, QwtPlotLegendItem

Reimplemented from QwtPlotItem.

Definition at line 413 of file qwt_plot_barchart.cpp.

QwtGraphic QwtPlotBarChart::legendIcon ( int  index,
const QSizeF &  size 
) const
protectedvirtual
Returns
Icon representing a bar or the chart on the legend

When the legendMode() is LegendBarTitles the icon shows the bar corresponding to index - otherwise the bar displays the default symbol.

Parameters
indexIndex of the legend entry
sizeIcon size
See also
setLegendMode(), drawBar(), QwtPlotItem::setLegendIconSize(), QwtPlotItem::legendData()

Reimplemented from QwtPlotItem.

Definition at line 465 of file qwt_plot_barchart.cpp.

QwtPlotBarChart::LegendMode QwtPlotBarChart::legendMode ( ) const
Returns
Legend mode
See also
setLegendMode()

Definition at line 174 of file qwt_plot_barchart.cpp.

int QwtPlotBarChart::rtti ( ) const
virtual
Returns
QwtPlotItem::Rtti_PlotBarChart

Reimplemented from QwtPlotItem.

Definition at line 67 of file qwt_plot_barchart.cpp.

void QwtPlotBarChart::setLegendMode ( LegendMode  mode)

Set the mode that decides what to display on the legend

In case of LegendBarTitles barTitle() needs to be overloaded to return individual titles for each bar.

Parameters
modeNew mode
See also
legendMode(), legendData(), barTitle(), QwtPlotItem::ItemAttribute

Definition at line 161 of file qwt_plot_barchart.cpp.

void QwtPlotBarChart::setSamples ( const QVector< QPointF > &  samples)

Initialize data with an array of points

Parameters
samplesVector of points
Note
QVector is implicitly shared
QPolygonF is derived from QVector<QPointF>

Definition at line 79 of file qwt_plot_barchart.cpp.

void QwtPlotBarChart::setSamples ( const QVector< double > &  samples)

Initialize data with an array of doubles

The indices in the array are taken as x coordinate, while the doubles are interpreted as y values.

Parameters
samplesVector of y coordinates
Note
QVector is implicitly shared

Definition at line 94 of file qwt_plot_barchart.cpp.

void QwtPlotBarChart::setSamples ( QwtSeriesData< QPointF > *  data)

Assign a series of samples

setSamples() is just a wrapper for setData() without any additional value - beside that it is easier to find for the developer.

Parameters
dataData
Warning
The item takes ownership of the data object, deleting it when its not used anymore.

Definition at line 116 of file qwt_plot_barchart.cpp.

void QwtPlotBarChart::setSymbol ( QwtColumnSymbol symbol)

Assign a symbol.

The bar chart will take the ownership of the symbol, hence the previously set symbol will be delete by setting a new one. If symbol is NULL no symbol will be drawn.

Parameters
symbolSymbol
See also
symbol()

Definition at line 131 of file qwt_plot_barchart.cpp.

QwtColumnSymbol * QwtPlotBarChart::specialSymbol ( int  sampleIndex,
const QPointF &  sample 
) const
virtual

Needs to be overloaded to return a non default symbol for a specific sample

Parameters
sampleIndexIndex of the sample represented by the bar
sampleValue of the sample
Returns
NULL, indicating to use the default symbol

Definition at line 374 of file qwt_plot_barchart.cpp.

const QwtColumnSymbol * QwtPlotBarChart::symbol ( ) const
Returns
Current symbol or NULL, when no symbol has been assigned
See also
setSymbol()

Definition at line 147 of file qwt_plot_barchart.cpp.

Member Data Documentation

PrivateData* QwtPlotBarChart::d_data
private

Definition at line 119 of file qwt_plot_barchart.h.


The documentation for this class was generated from the following files:


plotjuggler
Author(s): Davide Faconti
autogenerated on Sat Jul 6 2019 03:44:18