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/*!
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\class Widget
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\brief Ui for the application.
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*/
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#include "widget.h"
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#include <QGridLayout>
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#include <QPushButton>
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#include <QLabel>
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#include <QSqlQuery>
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#include <qscatterseries.h>
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#include <qchartview.h>
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#include <qchartaxis.h>
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#include <qbarchartseries.h>
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#include <qbarcategory.h>
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#include <qbarset.h>
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#include <QListWidget>
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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, 800, 600);
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// right panel layout
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countrieslist = new QListWidget;
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countrieslist->setSelectionMode(QAbstractItemView::MultiSelection);
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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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QVBoxLayout* rightPanelLayout = new QVBoxLayout;
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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->setStretch(0, 1);
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rightPanelLayout->setStretch(1, 0);
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// main layout
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chartArea = new QChartView(this);
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chartArea->setChartTitle("GDP by country");
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QGridLayout* mainLayout = new QGridLayout;
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mainLayout->addWidget(chartArea, 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 newAxis = chartArea->defaultAxisX();
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newAxis.setLabelsVisible(false);
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// newAxis.setLabelsOrientation(QChartAxis::LabelsOrientationSlide);
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chartArea->setDefaultAxisX(newAxis);
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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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// 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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// use the sorted selected coutries list to initialize BarCategory
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QBarCategory* category = new QBarCategory;
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for (int i = 0; i < selectedCountriesStrings.size(); i++)
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*category << selectedCountriesStrings[i];
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QBarChartSeries* series0 = new QBarChartSeries(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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QSqlQuery query;
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// selected years items list is not sorted. copy the values to QList<Integer> 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);
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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;
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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 Bosnia" << " : " << QString("%1").arg(selectedYearsInts[i]);
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}
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}
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series0->addBarSet(barSet);
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}
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// add the serie to the chart
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chartArea->addSeries(series0);
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}
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