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/*!
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\class Widget
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\brief Ui for the application.
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\internal
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*/
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#include "widget.h"
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#include <QChart>
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#include <QScatterSeries>
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#include <QChartAxis>
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#include <QBarset>
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#include <QBarSeries>
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#include <QGridLayout>
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#include <QPushButton>
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#include <QLabel>
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#include <QListWidget>
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#include <QPrinter>
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#include <QPrintDialog>
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#include <QRadioButton>
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#include <QStringList>
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#include <QSqlQuery>
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QTCOMMERCIALCHART_USE_NAMESPACE
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Widget::Widget(QWidget *parent)
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: QWidget(parent)
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{
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setGeometry(100, 100, 1000, 600);
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// right panel layout
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barChartRadioButton = new QRadioButton(tr("Bar chart"));
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barChartRadioButton->setChecked(true);
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scatterChartRadioButton = new QRadioButton(tr("Scatter chart"));
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scatterChartRadioButton->setChecked(false);
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countrieslist = new QListWidget;
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countrieslist->setSelectionMode(QAbstractItemView::MultiSelection);
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//list of years widget
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yearslist = new QListWidget;
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yearslist->setSelectionMode(QAbstractItemView::ExtendedSelection);
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for (int i = 1990; i < 2011; i++)
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yearslist->addItem(QString("%1").arg(i));
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QPushButton* refreshButton = new QPushButton(tr("Refresh"));
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connect(refreshButton, SIGNAL(clicked()), this, SLOT(refreshChart()));
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QPushButton* printButton = new QPushButton(tr("Print chart"));
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connect(printButton, SIGNAL(clicked()), this, SLOT(printChart()));
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QVBoxLayout* rightPanelLayout = new QVBoxLayout;
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rightPanelLayout->addWidget(barChartRadioButton);
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rightPanelLayout->addWidget(scatterChartRadioButton);
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rightPanelLayout->addWidget(countrieslist);
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rightPanelLayout->addWidget(yearslist);
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rightPanelLayout->addWidget(refreshButton);
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rightPanelLayout->addWidget(printButton);
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rightPanelLayout->setStretch(0, 1);
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rightPanelLayout->setStretch(1, 0);
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QChart *chart = new QChart();
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chart->setTitle("GDP by country");
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// main layout
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chartView = new QChartView(chart);
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QGridLayout* mainLayout = new QGridLayout;
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mainLayout->addWidget(chartView, 0, 0);
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mainLayout->addLayout(rightPanelLayout, 0, 1);
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mainLayout->setColumnStretch(0,1);
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setLayout(mainLayout);
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// connect to the database
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db = QSqlDatabase::addDatabase("QSQLITE");
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db.setDatabaseName("gdpData");
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if(!db.open())
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{
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qDebug() << "could not open database. SQLite db file missing (?)";
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return;
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}
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// get the list of all countires and regions.
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QSqlQuery query;
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query.exec("SELECT DISTINCT country FROM gdp2");
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// add the countries to the country filter
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while (query.next()) {
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countrieslist->addItem(query.value(0).toString());
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}
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// hide axis X labels
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//QChartAxis* axis = chartArea->axisX();
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// axis->
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// axis->setLabelsVisible(false);
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// newAxis.setLabelsOrientation(QChartAxis::LabelsOrientationSlide);
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}
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Widget::~Widget()
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{
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//
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db.close();
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}
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/*!
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refreshes the chart
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*/
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void Widget::refreshChart()
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{
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chartView->chart()->removeAllSeries();
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// selected countries items list is not sorted. copy the values to QStringlist and sort them.
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QStringList selectedCountriesStrings;
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QList<QListWidgetItem*> selectedCountriesItems = countrieslist->selectedItems();
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for (int i = 0; i < selectedCountriesItems.size(); i++)
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selectedCountriesStrings.append(selectedCountriesItems[i]->text());
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selectedCountriesStrings.sort();
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QSqlQuery query;
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// selected years items list is not sorted. copy the values to QList<int> and sort them.
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QList<int> selectedYearsInts;
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QList<QListWidgetItem*> selectedYearsItems = yearslist->selectedItems();
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for (int i = 0; i < selectedYearsItems.size(); i++)
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selectedYearsInts.append(selectedYearsItems[i]->text().toInt());
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qSort(selectedYearsInts.begin(), selectedYearsInts.end(), qGreater<int>());
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if (barChartRadioButton->isChecked())
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{
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// use the sorted selected coutries list to initialize BarCategory
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QStringList category;
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for (int i = 0; i < selectedCountriesStrings.size(); i++)
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category << selectedCountriesStrings[i];
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QBarSeries* series0 = new QBarSeries(category);
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series0 = new QBarSeries(category);
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// prepare the selected counries SQL query
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QString countriesQuery = "country IN (";
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for (int i = 0; i < selectedCountriesStrings.size(); i++)
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{
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countriesQuery.append("'" + selectedCountriesStrings[i] + "'");
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if ( i < selectedCountriesStrings.size() - 1)
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countriesQuery.append(",");
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else
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countriesQuery.append(")");
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}
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// perform a query for each selected year
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for (int i = 0; i < selectedYearsInts.size(); i++)
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{
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query.exec("SELECT country,gdpvalue FROM gdp2 where year=" + QString("%1").arg(selectedYearsInts[i]) + " AND " + countriesQuery);
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QBarSet* barSet = new QBarSet("Barset" + QString::number(i));
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// while (query.next()) {
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// qDebug() << query.value(0).toString() << " : " << query.value(1).toString();
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// }
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query.first();
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// the data for some of the coutries for some years might be missing.
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// QBarChart needs bars to have same size
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for (int k = 0; k < selectedCountriesStrings.size(); k++)
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{
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if (selectedCountriesStrings[k] == query.value(0).toString())
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{
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*barSet << query.value(1).toReal();
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qDebug() << query.value(0).toString() << query.value(1).toReal() << " : " << QString("%1").arg(selectedYearsInts[i]);
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query.next();
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}
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else
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{
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// data missing, put 0
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*barSet << 0.0f;
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qDebug() << "Putting 0 for the missing data" << " : " << QString("%1").arg(selectedYearsInts[i]);
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}
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}
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series0->appendBarSet(barSet);
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}
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// add the serie to the chart
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chartView->chart()->addSeries(series0);
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}
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else if (scatterChartRadioButton->isChecked())
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{
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QString yearsQuery = "year IN (";
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for (int i = 0; i < selectedYearsInts.size(); i++)
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{
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yearsQuery.append("'" + QString("%1").arg(selectedYearsInts[i]) + "'");
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if ( i < selectedYearsInts.size() - 1)
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yearsQuery.append(",");
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else
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yearsQuery.append(")");
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}
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// perform a query for each selected country
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for (int i = 0; i < selectedCountriesStrings.size(); i++)
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{
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query.exec("SELECT year,gdpvalue FROM gdp2 where country='" + selectedCountriesStrings[i] + "' AND " + yearsQuery);
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query.first();
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QScatterSeries* series = new QScatterSeries;
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// the data for some of the coutries for some years might be missing.
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for (int k = 0; k < selectedYearsInts.size(); k++)
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{
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if (selectedYearsInts[k] == query.value(0).toInt())
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{
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*series << QPointF(query.value(0).toInt() , query.value(1).toReal());
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qDebug() << query.value(0).toString() << query.value(1).toReal() << " : " << QString("%1").arg(selectedYearsInts[k]);
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query.next();
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}
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else
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{
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// data missing, put 0
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*series << QPointF(selectedYearsInts[k] , 0.0f);
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qDebug() << "Putting 0 for the missing data" << " : " << QString("%1").arg(selectedYearsInts[i]) << " " << query.value(0).toInt();
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}
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}
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// chartArea->axisX()->setRange(selectedYearsInts[selectedYearsInts.size() - 1] + 1, selectedYearsInts[0] - 1);
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chartView->chart()->addSeries(series);
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}
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chartView->chart()->axisX()->setRange(selectedYearsInts[selectedYearsInts.size() - 1] - 1, selectedYearsInts[0] + 1);
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}
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}
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void Widget::printChart()
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{
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QPrinter printer;
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// QPrinter printer(QPrinter::HighResolution);
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printer.setOutputFormat(QPrinter::PdfFormat);
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printer.setOrientation(QPrinter::Landscape);
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printer.setOutputFileName("print.pdf");
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QPainter painter;
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painter.begin(&printer);
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chartView->render(&painter);
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}
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