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Marek Rosa -
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1 1 /*!
2 2 \page examples.html
3 3 \title Examples
4 4 \keyword Examples
5 5
6 6 \raw HTML
7 7 <table cellpadding="2" cellspacing="1" border="0" width="100%" class="indextable">
8 8 <tr>
9 9 <th class="titleheader" width="33%">
10 10 List of examples
11 11 </th>
12 12 </tr>
13 13 <tr>
14 14 <td valign="top">
15 15 <ul>
16 16 <li><a href="example-barchart.html">Bar Chart example</a></li>
17 17 <li><a href="example-linechart.html">Line Chart example</a></li>
18 18 <li><a href="example-piechart.html">Pie Chart example</a></li>
19 <li><a href="example-gdpbarchart.html">GDP Chart example</a></li>
19 20 </ul>
20 21 </td>
21 22 </tr>
22 23 </table>
23 24 \endraw
24 25 */
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@@ -1,227 +1,227
1 1 /*!
2 2 \class Widget
3 3 \brief Ui for the application.
4 4 \internal
5 5 */
6 6
7 7 #include "widget.h"
8 8 #include <QGridLayout>
9 9 #include <QPushButton>
10 10 #include <QLabel>
11 11
12 12 #include <QSqlQuery>
13 13 #include <qscatterseries.h>
14 14 #include <qchartview.h>
15 15 #include <qchartaxis.h>
16 16 #include <qbarcategory.h>
17 17 #include <qbarset.h>
18 18 #include <QListWidget>
19 19 #include <QPrinter>
20 20 #include <QPrintDialog>
21 21 #include <QRadioButton>
22 22
23 23 QTCOMMERCIALCHART_USE_NAMESPACE
24 24
25 25 Widget::Widget(QWidget *parent)
26 26 : QWidget(parent)
27 27 {
28 28 setGeometry(100, 100, 1000, 600);
29 29
30 30 // right panel layout
31 31 barChartRadioButton = new QRadioButton(tr("Bar chart"));
32 32 barChartRadioButton->setChecked(true);
33 33 scatterChartRadioButton = new QRadioButton(tr("Scatter chart"));
34 34 scatterChartRadioButton->setChecked(false);
35 35 countrieslist = new QListWidget;
36 36 countrieslist->setSelectionMode(QAbstractItemView::MultiSelection);
37 37
38 //list of years widget
38 39 yearslist = new QListWidget;
39 40 yearslist->setSelectionMode(QAbstractItemView::ExtendedSelection);
40 41 for (int i = 1990; i < 2011; i++)
41 42 yearslist->addItem(QString("%1").arg(i));
42 43
43 44 QPushButton* refreshButton = new QPushButton(tr("Refresh"));
44 45 connect(refreshButton, SIGNAL(clicked()), this, SLOT(refreshChart()));
45 46
46 47 QPushButton* printButton = new QPushButton(tr("Print chart"));
47 48 connect(printButton, SIGNAL(clicked()), this, SLOT(printChart()));
48 49
49 50 QVBoxLayout* rightPanelLayout = new QVBoxLayout;
50 51 rightPanelLayout->addWidget(barChartRadioButton);
51 52 rightPanelLayout->addWidget(scatterChartRadioButton);
52 53 rightPanelLayout->addWidget(countrieslist);
53 54 rightPanelLayout->addWidget(yearslist);
54 55 rightPanelLayout->addWidget(refreshButton);
55 56 rightPanelLayout->addWidget(printButton);
56 57 rightPanelLayout->setStretch(0, 1);
57 58 rightPanelLayout->setStretch(1, 0);
58 59
59 60 // main layout
60 61 chartArea = new QChartView(this);
61 62 chartArea->setChartTitle("GDP by country");
62 63 QGridLayout* mainLayout = new QGridLayout;
63 64 mainLayout->addWidget(chartArea, 0, 0);
64 65 mainLayout->addLayout(rightPanelLayout, 0, 1);
65 66 mainLayout->setColumnStretch(0,1);
66 67 setLayout(mainLayout);
67 68
68 69 // connect to the database
69 70 db = QSqlDatabase::addDatabase("QSQLITE");
70 71 db.setDatabaseName("gdpData");
71 72 if(!db.open())
72 73 {
73 74 qDebug() << "could not open database. SQLite db file missing (?)";
74 75 return;
75 76 }
76 77
77 78 // get the list of all countires and regions.
78 79 QSqlQuery query;
79 80 query.exec("SELECT DISTINCT country FROM gdp2");
80 81
81 82 // add the countries to the country filter
82 83 while (query.next()) {
83 84 countrieslist->addItem(query.value(0).toString());
84 85 }
85 86
86 87 // hide axis X labels
87 88 QChartAxis* axis = chartArea->axisX();
88 89 // axis->setLabelsVisible(false);
89 90 // newAxis.setLabelsOrientation(QChartAxis::LabelsOrientationSlide);
90 91
91 92 }
92 93
93 94 Widget::~Widget()
94 95 {
95 96 //
96 97 db.close();
97 98 }
98 99
99 100 /*!
100 101 refreshes the chart
101 102 */
102 103 void Widget::refreshChart()
103 104 {
104 105 chartArea->removeAllSeries();
105 106
106 107 // selected countries items list is not sorted. copy the values to QStringlist and sort them.
107 108 QStringList selectedCountriesStrings;
108 109 QList<QListWidgetItem*> selectedCountriesItems = countrieslist->selectedItems();
109 110 for (int i = 0; i < selectedCountriesItems.size(); i++)
110 111 selectedCountriesStrings.append(selectedCountriesItems[i]->text());
111 112 selectedCountriesStrings.sort();
112 113
113 114 QSqlQuery query;
114 // selected years items list is not sorted. copy the values to QList<Integer> and sort them.
115 // selected years items list is not sorted. copy the values to QList<int> and sort them.
115 116 QList<int> selectedYearsInts;
116 117 QList<QListWidgetItem*> selectedYearsItems = yearslist->selectedItems();
117 118 for (int i = 0; i < selectedYearsItems.size(); i++)
118 119 selectedYearsInts.append(selectedYearsItems[i]->text().toInt());
119 120 qSort(selectedYearsInts.begin(), selectedYearsInts.end(), qGreater<int>());
120 121
121 122 if (barChartRadioButton->isChecked())
122 123 {
123 124 // use the sorted selected coutries list to initialize BarCategory
124 125 QBarCategory* category = new QBarCategory;
125 126 for (int i = 0; i < selectedCountriesStrings.size(); i++)
126 127 *category << selectedCountriesStrings[i];
127 series0 = new QBarChartSeries(category);
128 QBarChartSeries* series0 = new QBarChartSeries(category);
128 129
129 130 // prepare the selected counries SQL query
130 131 QString countriesQuery = "country IN (";
131 132 for (int i = 0; i < selectedCountriesStrings.size(); i++)
132 133 {
133 134 countriesQuery.append("'" + selectedCountriesStrings[i] + "'");
134 135 if ( i < selectedCountriesStrings.size() - 1)
135 136 countriesQuery.append(",");
136 137 else
137 138 countriesQuery.append(")");
138 139 }
139 140
140 141 // perform a query for each selected year
141 142 for (int i = 0; i < selectedYearsInts.size(); i++)
142 143 {
143 144 query.exec("SELECT country,gdpvalue FROM gdp2 where year=" + QString("%1").arg(selectedYearsInts[i]) + " AND " + countriesQuery);
144 145 QBarSet* barSet = new QBarSet("Barset" + QString::number(i));
145 146
146 147 // while (query.next()) {
147 148 // qDebug() << query.value(0).toString() << " : " << query.value(1).toString();
148 149 // }
149 150 query.first();
150 151
151 152 // the data for some of the coutries for some years might be missing.
152 153 // QBarChart needs bars to have same size
153 154 for (int k = 0; k < selectedCountriesStrings.size(); k++)
154 155 {
155 156 if (selectedCountriesStrings[k] == query.value(0).toString())
156 157 {
157 158 *barSet << query.value(1).toReal();
158 159 qDebug() << query.value(0).toString() << query.value(1).toReal() << " : " << QString("%1").arg(selectedYearsInts[i]);
159 160 query.next();
160 161 }
161 162 else
162 163 {
163 164 // data missing, put 0
164 165 *barSet << 0.0f;
165 qDebug() << "Putting 0 for Bosnia" << " : " << QString("%1").arg(selectedYearsInts[i]);
166 qDebug() << "Putting 0 for the missing data" << " : " << QString("%1").arg(selectedYearsInts[i]);
166 167 }
167 168 }
168 169 series0->addBarSet(barSet);
169 170 }
170 171 // add the serie to the chart
171 172 chartArea->addSeries(series0);
172
173 173 }
174 174 else if (scatterChartRadioButton->isChecked())
175 175 {
176 176 QString yearsQuery = "year IN (";
177 177 for (int i = 0; i < selectedYearsInts.size(); i++)
178 178 {
179 179 yearsQuery.append("'" + QString("%1").arg(selectedYearsInts[i]) + "'");
180 180 if ( i < selectedYearsInts.size() - 1)
181 181 yearsQuery.append(",");
182 182 else
183 183 yearsQuery.append(")");
184 184 }
185 185
186 // perform a query for each selected year
186 // perform a query for each selected country
187 187 for (int i = 0; i < selectedCountriesStrings.size(); i++)
188 188 {
189 189 query.exec("SELECT year,gdpvalue FROM gdp2 where country='" + selectedCountriesStrings[i] + "' AND " + yearsQuery);
190 190 query.first();
191 191
192 192 QScatterSeries* series = new QScatterSeries;
193 193 // the data for some of the coutries for some years might be missing.
194 194 for (int k = 0; k < selectedYearsInts.size(); k++)
195 195 {
196 196 if (selectedYearsInts[k] == query.value(0).toInt())
197 197 {
198 198 *series << QPointF(query.value(0).toInt() , query.value(1).toReal());
199 199 qDebug() << query.value(0).toString() << query.value(1).toReal() << " : " << QString("%1").arg(selectedYearsInts[k]);
200 200 query.next();
201 201 }
202 202 else
203 203 {
204 204 // data missing, put 0
205 205 *series << QPointF(selectedYearsInts[k] , 0.0f);
206 qDebug() << "Putting 0 for Bosnia" << " : " << QString("%1").arg(selectedYearsInts[i]) << " " << query.value(0).toInt();
206 qDebug() << "Putting 0 for the missing data" << " : " << QString("%1").arg(selectedYearsInts[i]) << " " << query.value(0).toInt();
207 207 }
208 208 }
209 209 // chartArea->axisX()->setRange(selectedYearsInts[selectedYearsInts.size() - 1] + 1, selectedYearsInts[0] - 1);
210 210 chartArea->addSeries(series);
211 211 }
212 212 chartArea->axisX()->setRange(selectedYearsInts[selectedYearsInts.size() - 1] + 1, selectedYearsInts[0] - 1);
213 213 }
214 214 }
215 215
216 216 void Widget::printChart()
217 217 {
218 218 QPrinter printer;
219 219 // QPrinter printer(QPrinter::HighResolution);
220 220 printer.setOutputFormat(QPrinter::PdfFormat);
221 221 printer.setOrientation(QPrinter::Landscape);
222 222 printer.setOutputFileName("print.pdf");
223 223
224 224 QPainter painter;
225 225 painter.begin(&printer);
226 226 chartArea->render(&painter);
227 227 }
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@@ -1,36 +1,36
1 1 #ifndef WIDGET_H
2 2 #define WIDGET_H
3 3
4 4 #include <QtGui/QWidget>
5 5 #include <qchartview.h>
6 6 #include <qbarchartseries.h>
7 7 #include <QSqlDatabase>
8 8
9 9 QTCOMMERCIALCHART_USE_NAMESPACE
10 10
11 11 class QListWidget;
12 12 class QRadioButton;
13 13
14 14 class Widget : public QWidget
15 15 {
16 16 Q_OBJECT
17 17
18 18 public:
19 19 Widget(QWidget *parent = 0);
20 20 ~Widget();
21 21
22 22 public slots:
23 23 void refreshChart();
24 24 void printChart();
25 25
26 26 private:
27 27 QChartView* chartArea;
28 28 QListWidget* countrieslist;
29 29 QListWidget* yearslist;
30 30 QSqlDatabase db;
31 QBarChartSeries* series0;
31 // QBarChartSeries* series0;
32 32 QRadioButton* barChartRadioButton;
33 33 QRadioButton* scatterChartRadioButton;
34 34 };
35 35
36 36 #endif // WIDGET_H
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