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Diffstat (limited to 'examples/charts/selectedbar/main.cpp')
-rw-r--r-- | examples/charts/selectedbar/main.cpp | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/examples/charts/selectedbar/main.cpp b/examples/charts/selectedbar/main.cpp new file mode 100644 index 00000000..9ed62441 --- /dev/null +++ b/examples/charts/selectedbar/main.cpp @@ -0,0 +1,146 @@ +/**************************************************************************** +** +** Copyright (C) 2021 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the Qt Charts module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:GPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3 or (at your option) any later version +** approved by the KDE Free Qt Foundation. The licenses are as published by +** the Free Software Foundation and appearing in the file LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "utilities.h" +#include <QBarSet> +#include <QApplication> +#include <QBarSeries> +#include <QList> +#include <QChart> +#include <QBarCategoryAxis> +#include <QValueAxis> +#include <QChartView> +#include <QWindow> +#include <QHBoxLayout> +#include <QLabel> +#include <QMainWindow> + +int main(int argc, char *argv[]) +{ + QApplication a(argc, argv); + QMainWindow mainWindow; + mainWindow.setWindowTitle(QCoreApplication::tr("Meat consumption series")); + + //![1] + QBarSet *setChicken = Utilities::createChickenSet(); + QBarSet *setPork = Utilities::createPorkSet(); + QBarSet *setTurkey = Utilities::createTurkeySet(); + QBarSet *setHam = Utilities::createHamSet(); + qreal totalSum = setChicken->sum() + setPork->sum() + setTurkey->sum() + setHam->sum(); + QList<QBarSet *> setList = QList<QBarSet *>{setChicken, setPork, setTurkey, setHam}; + + QBarSeries *series = new QBarSeries(); + series->append(setList); + //![1] + + //![2] + QChart *chart = new QChart(); + chart->addSeries(series); + chart->setTitle(QCoreApplication::tr("Meat consumption")); + chart->setAnimationOptions(QChart::SeriesAnimations); + chart->legend()->setVisible(true); + chart->legend()->setAlignment(Qt::AlignBottom); + //![2] + + //![3] + for (QBarSet *barSet : series->barSets()) + barSet->setSelectedColor(barSet->brush().color().darker()); + //![3] + + //![4] + QStringList categories = Utilities::createYearCategories(); + QBarCategoryAxis *axisX = new QBarCategoryAxis(); + axisX->setCategories(categories); + chart->addAxis(axisX, Qt::AlignBottom); + series->attachAxis(axisX); + + QValueAxis *axisY = new QValueAxis(); + axisY->setRange(0, 20); + axisY->setTitleText(QCoreApplication::tr("Tons")); + axisY->setLabelsAngle(-90); + axisY->setTitleVisible(true); + chart->addAxis(axisY, Qt::AlignLeft); + series->attachAxis(axisY); + //![4] + + //![5] + QChartView *chartView = new QChartView(chart); + chartView->setRenderHint(QPainter::Antialiasing); + //![5] + + //![6] + QWidget *labelWidget = new QWidget(&mainWindow); + QHBoxLayout *labelLayout = new QHBoxLayout(labelWidget); + labelLayout->setAlignment(Qt::AlignCenter); + + QLabel *totalSumLabel = new QLabel(QCoreApplication::tr("Total sum: %1 T").arg(totalSum)); + labelLayout->addWidget(totalSumLabel); + totalSumLabel->setContentsMargins(0, 0, 54, 0); + + QLabel *selectedSumLabel = new QLabel(QCoreApplication::tr("Selected sum: 0 T")); + labelLayout->addWidget(selectedSumLabel); + + QLabel *unselectedSumLabel = new QLabel(QCoreApplication::tr("Unselected sum: %1 T").arg(totalSum)); + labelLayout->addWidget(unselectedSumLabel); + unselectedSumLabel->setContentsMargins(54, 0, 0, 0); + //![6] + + //![7] + QObject::connect(series, &QAbstractBarSeries::clicked, series, [=](int index, QBarSet *set) { + set->toggleSelection({index}); + qreal selectedSum = 0.; + for (int i = 0; i < setList.size(); ++i) { + auto selectedIndices = setList.at(i)->selectedBars(); + for (int k = 0; k < selectedIndices.size(); ++k) + selectedSum += setList.at(i)->at(selectedIndices.at(k)); + } + selectedSumLabel->setText(QCoreApplication::tr("Selected sum: %1 T").arg(selectedSum)); + // Because of rounding errors, selectedSum can result in being bigger than total sum + qreal unselectedSum = totalSum - selectedSum < 0 ? 0. : totalSum - selectedSum; + unselectedSumLabel->setText( + QCoreApplication::tr("Unselected sum: %1 T") + .arg(unselectedSum) + ); + }); + //![7] + + //![8] + QWidget *mainWidget = new QWidget(&mainWindow); + QVBoxLayout *mainLayout = new QVBoxLayout(mainWidget); + + mainLayout->addWidget(chartView); + mainLayout->addWidget(labelWidget); + + mainWindow.setCentralWidget(mainWidget); + mainWindow.resize(800, 600); + + mainWindow.show(); + return a.exec(); + //![8] +} |