QwtTextQwtPlotBarChart::barTitle(intsampleIndex)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:sampleIndex Index of the bar
Returns:
An empty text
Seealso:LegendBarTitlesQRectFQwtPlotBarChart::boundingRect()const[virtual]Returns:
Bounding rectangle of all samples. For an empty series the rectangle is invalid.
Reimplemented from QwtPlotSeriesItem.
voidQwtPlotBarChart::drawBar(QPainter*painter,intsampleIndex,constQPointF&sample,constQwtColumnRect&rect)const[protected],[virtual]
Draw a bar
Parameters:painter Painter
sampleIndex Index of the sample represented by the bar
sample Value of the sample
rect Bounding rectangle of the bar
voidQwtPlotBarChart::drawSample(QPainter*painter,constQwtScaleMap&xMap,constQwtScaleMap&yMap,constQRectF&canvasRect,constQwtInterval&boundingInterval,intindex,constQPointF&sample)const[protected],[virtual]
Draw a sample
Parameters:painter Painter
xMap x map
yMap y map
canvasRect Contents rect of the canvas
boundingInterval Bounding interval of sample values
index Index of the sample
sample Value of the sample
Seealso:drawSeries()voidQwtPlotBarChart::drawSeries(QPainter*painter,constQwtScaleMap&xMap,constQwtScaleMap&yMap,constQRectF&canvasRect,intfrom,intto)const[virtual]
Draw an interval of the bar chart
Parameters:painter Painter
xMap Maps x-values into pixel coordinates.
yMap Maps y-values into pixel coordinates.
canvasRect Contents rect of the canvas
from Index of the first point to be painted
to Index of the last point to be painted. If to < 0 the curve will be painted to its last point.
Seealso:
drawSymbols()
Implements QwtPlotSeriesItem.
QList<QwtLegendData>QwtPlotBarChart::legendData()const[protected],[virtual]
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
Seealso:title(), setLegendMode(), barTitle(), QwtLegend, QwtPlotLegendItem
Reimplemented from QwtPlotItem.
QwtGraphicQwtPlotBarChart::legendIcon(intindex,constQSizeF&size)const[protected],[virtual]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:index Index of the legend entry
size Icon size
Seealso:setLegendMode(), drawBar(), QwtPlotItem::setLegendIconSize(), QwtPlotItem::legendData()
Reimplemented from QwtPlotItem.
QwtPlotBarChart::LegendModeQwtPlotBarChart::legendMode()constReturns:
Legend mode
Seealso:setLegendMode()intQwtPlotBarChart::rtti()const[virtual]Returns:QwtPlotItem::Rtti_PlotBarChart
Reimplemented from QwtPlotItem.
voidQwtPlotBarChart::setLegendMode(LegendModemode)
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:mode New mode
Seealso:legendMode(), legendData(), barTitle(), QwtPlotItem::ItemAttributevoidQwtPlotBarChart::setSamples(constQVector<QPointF>&samples)
Initialize data with an array of points
Parameters:samples Vector of points
Note:
QVector is implicitly shared
QPolygonF is derived from QVector<QPointF>
voidQwtPlotBarChart::setSamples(constQVector<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:samples Vector of y coordinates
Note:
QVector is implicitly shared
voidQwtPlotBarChart::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:data Data
Warning:
The item takes ownership of the data object, deleting it when its not used anymore.
voidQwtPlotBarChart::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:symbol Symbol
Seealso:symbol()QwtColumnSymbol*QwtPlotBarChart::specialSymbol(intsampleIndex,constQPointF&sample)const[virtual]
Needs to be overloaded to return a non default symbol for a specific sample
Parameters:sampleIndex Index of the sample represented by the bar
sample Value of the sample
Returns:
NULL, indicating to use the default symbol
constQwtColumnSymbol*QwtPlotBarChart::symbol()constReturns:
Current symbol or NULL, when no symbol has been assigned
Seealso:setSymbol()
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