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Refactored donutbreakdown example
Jani Honkonen -
r1875:431c64e8346f
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1 #include "donutbreakdownchart.h"
2 #include <QPieSlice>
3
4 QTCOMMERCIALCHART_USE_NAMESPACE
5
6 //![1]
7 DonutBreakdownChart::DonutBreakdownChart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
8 :QChart(parent, wFlags)
9 {
10 // create the series for main center pie
11 mainSeries = new QPieSeries();
12 mainSeries->setPieSize(0.7);
13 addSeries(mainSeries);
14 }
15 //![1]
16
17 //![2]
18 void DonutBreakdownChart::addBreakdownSeries(QPieSeries *breakdownSeries, QColor color)
19 {
20 // add breakdown series as a slice to center pie
21 QPieSlice *slice = mainSeries->append(breakdownSeries->name(), breakdownSeries->sum());
22
23 // customize the slice
24 slice->setBrush(color);
25 slice->setLabelVisible();
26 slice->setLabelColor(Qt::white);
27 slice->setLabelPosition(QPieSlice::LabelInsideHorizontal);
28
29 // position and customize the breakdown series
30 breakdownSeries->setPieSize(0.8);
31 breakdownSeries->setHoleSize(0.7);
32 breakdownSeries->setLabelsVisible();
33 foreach (QPieSlice *slice, breakdownSeries->slices()) {
34 color = color.lighter(110);
35 slice->setBrush(color);
36 slice->setLabelFont(QFont("Arial", 7));
37 slice->setLabelArmLengthFactor(0.05);
38 }
39
40 // add the series to the chart
41 addSeries(breakdownSeries);
42
43 // recalculate breakdown donut segments
44 recalculateAngles();
45 }
46 //![2]
47
48 void DonutBreakdownChart::recalculateAngles()
49 {
50 qreal angle = 0;
51 foreach (QPieSlice *slice, mainSeries->slices()) {
52 QPieSeries *s = find(slice->label());
53 if (s) {
54 s->setPieStartAngle(angle);
55 angle += slice->percentage() * 360.0;
56 s->setPieEndAngle(angle);
57 }
58 }
59 }
60
61 QPieSeries *DonutBreakdownChart::find(QString seriesName) const
62 {
63 // find pieseries by name
64 foreach (QAbstractSeries *series, this->series()) {
65 QPieSeries *s = qobject_cast<QPieSeries*>(series);
66 if (!s)
67 continue;
68 if (s->name() == seriesName)
69 return s;
70 }
71 return 0;
72 }
73
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@@ -0,0 +1,23
1 #ifndef DONUTBREAKDOWNCHART_H
2 #define DONUTBREAKDOWNCHART_H
3
4 #include <QChart>
5 #include <QPieSeries>
6
7 QTCOMMERCIALCHART_USE_NAMESPACE
8
9 class DonutBreakdownChart : public QChart
10 {
11 public:
12 DonutBreakdownChart(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0);
13 void addBreakdownSeries(QPieSeries *series, QColor color);
14
15 private:
16 void recalculateAngles();
17 QPieSeries *find(QString seriesName) const;
18
19 private:
20 QPieSeries *mainSeries;
21 };
22
23 #endif // DONUTBREAKDOWNCHART_H
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@@ -4,6 +4,7
4
4
5 TARGET = donutbreakdown
5 TARGET = donutbreakdown
6 SOURCES += main.cpp\
6 SOURCES += main.cpp\
7 widget.cpp
7 donutbreakdownchart.cpp
8
8
9 HEADERS += widget.h
9 HEADERS += \
10 donutbreakdownchart.h
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@@ -1,11 +1,55
1 #include <QApplication>
1 #include <QApplication>
2 #include "widget.h"
2 #include <QMainWindow>
3 #include <QChartView>
4 #include "donutbreakdownchart.h"
5
6 QTCOMMERCIALCHART_USE_NAMESPACE
3
7
4 int main(int argc, char *argv[])
8 int main(int argc, char *argv[])
5 {
9 {
6 QApplication a(argc, argv);
10 QApplication a(argc, argv);
7 Widget w;
11
8 w.show();
12 // Data from http://www.stat.fi/til/ekul/2010/ekul_2010_2011-12-13_tie_001_en.html
13
14 //![1]
15 QPieSeries *series1 = new QPieSeries();
16 series1->setName("Fossil");
17 series1->append("Oil", 353295);
18 series1->append("Wood", 319663);
19 series1->append("Coal", 188500);
20 series1->append("Natural gas", 148680);
21 series1->append("Peat", 94545);
22
23 QPieSeries *series2 = new QPieSeries();
24 series2->setName("Renewable");
25 series2->append("Hydro power", 45875);
26 series2->append("Wind power", 1060);
27
28 QPieSeries *series3 = new QPieSeries();
29 series3->setName("Other");
30 series3->append("Nuclear energy", 238789);
31 series3->append("Import energy", 37802);
32 series3->append("Others", 32441);
33 //![1]
34
35 //![2]
36 DonutBreakdownChart *donutBreakdown = new DonutBreakdownChart();
37 donutBreakdown->setAnimationOptions(QChart::AllAnimations);
38 donutBreakdown->setTitle("Total consumption of energy in Finland 2010");
39 donutBreakdown->legend()->setVisible(false);
40 donutBreakdown->addBreakdownSeries(series1, Qt::red);
41 donutBreakdown->addBreakdownSeries(series2, Qt::darkGreen);
42 donutBreakdown->addBreakdownSeries(series3, Qt::darkBlue);
43 //![2]
44
45 //![3]
46 QMainWindow window;
47 QChartView* chartView = new QChartView(donutBreakdown);
48 chartView->setRenderHint(QPainter::Antialiasing);
49 window.setCentralWidget(chartView);
50 window.resize(800, 600);
51 window.show();
52 //![3]
9
53
10 return a.exec();
54 return a.exec();
11 }
55 }
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@@ -46,9 +46,9 int main(int argc, char *argv[])
46 chartView->setRenderHint(QPainter::Antialiasing);
46 chartView->setRenderHint(QPainter::Antialiasing);
47 chartView->chart()->setTitle("Donut with a lemon glaze (100g)");
47 chartView->chart()->setTitle("Donut with a lemon glaze (100g)");
48 chartView->chart()->addSeries(series);
48 chartView->chart()->addSeries(series);
49 chartView->chart()->legend()->setAlignment(Qt::AlignBottom);
49 chartView->chart()->legend()->setAlignment(Qt::AlignLeft);
50 chartView->chart()->setTheme(QChart::ChartThemeBlueCerulean);
50 chartView->chart()->setTheme(QChart::ChartThemeBlueCerulean);
51 chartView->chart()->legend()->setFont(QFont("Arial", 7));
51 //chartView->chart()->legend()->setFont(QFont("Arial", 7));
52 //![2]
52 //![2]
53
53
54 //![3]
54 //![3]
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