donutbreakdownchart.cpp
73 lines
| 2.0 KiB
| text/x-c
|
CppLexer
Jani Honkonen
|
r1875 | #include "donutbreakdownchart.h" | ||
| #include <QPieSlice> | ||||
| QTCOMMERCIALCHART_USE_NAMESPACE | ||||
| //![1] | ||||
| DonutBreakdownChart::DonutBreakdownChart(QGraphicsItem *parent, Qt::WindowFlags wFlags) | ||||
| :QChart(parent, wFlags) | ||||
| { | ||||
| // create the series for main center pie | ||||
| mainSeries = new QPieSeries(); | ||||
| mainSeries->setPieSize(0.7); | ||||
| addSeries(mainSeries); | ||||
| } | ||||
| //![1] | ||||
| //![2] | ||||
| void DonutBreakdownChart::addBreakdownSeries(QPieSeries *breakdownSeries, QColor color) | ||||
| { | ||||
| // add breakdown series as a slice to center pie | ||||
| QPieSlice *slice = mainSeries->append(breakdownSeries->name(), breakdownSeries->sum()); | ||||
| // customize the slice | ||||
| slice->setBrush(color); | ||||
| slice->setLabelVisible(); | ||||
| slice->setLabelColor(Qt::white); | ||||
| slice->setLabelPosition(QPieSlice::LabelInsideHorizontal); | ||||
| // position and customize the breakdown series | ||||
| breakdownSeries->setPieSize(0.8); | ||||
| breakdownSeries->setHoleSize(0.7); | ||||
| breakdownSeries->setLabelsVisible(); | ||||
| foreach (QPieSlice *slice, breakdownSeries->slices()) { | ||||
| color = color.lighter(110); | ||||
| slice->setBrush(color); | ||||
| slice->setLabelFont(QFont("Arial", 7)); | ||||
| slice->setLabelArmLengthFactor(0.05); | ||||
| } | ||||
| // add the series to the chart | ||||
| addSeries(breakdownSeries); | ||||
| // recalculate breakdown donut segments | ||||
| recalculateAngles(); | ||||
| } | ||||
| //![2] | ||||
| void DonutBreakdownChart::recalculateAngles() | ||||
| { | ||||
| qreal angle = 0; | ||||
| foreach (QPieSlice *slice, mainSeries->slices()) { | ||||
| QPieSeries *s = find(slice->label()); | ||||
| if (s) { | ||||
| s->setPieStartAngle(angle); | ||||
| angle += slice->percentage() * 360.0; | ||||
| s->setPieEndAngle(angle); | ||||
| } | ||||
| } | ||||
| } | ||||
| QPieSeries *DonutBreakdownChart::find(QString seriesName) const | ||||
| { | ||||
| // find pieseries by name | ||||
| foreach (QAbstractSeries *series, this->series()) { | ||||
| QPieSeries *s = qobject_cast<QPieSeries*>(series); | ||||
| if (!s) | ||||
| continue; | ||||
| if (s->name() == seriesName) | ||||
| return s; | ||||
| } | ||||
| return 0; | ||||
| } | ||||