File indexing completed on 2024-05-12 16:45:36

 /***************************************************************************
     Copyright (C) 2021 Robby Stephenson <robby@periapsis.org>
  ***************************************************************************/
 
 /***************************************************************************
  *                                                                         *
  *   This program is free software; you can redistribute it and/or         *
  *   modify it under the terms of the GNU General Public License as        *
  *   published by the Free Software Foundation; either version 2 of        *
  *   the License or (at your option) version 3 or any later version        *
  *   accepted by the membership of KDE e.V. (or its successor approved     *
  *   by the membership of KDE e.V.), which shall act as a proxy            *
  *   defined in Section 14 of version 3 of the license.                    *
  *                                                                         *
  *   This program is distributed in the hope that it will be useful,       *
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  *   GNU General Public License for more details.                          *
  *                                                                         *
  *   You should have received a copy of the GNU General Public License     *
  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  *                                                                         *
  ***************************************************************************/
 
 #include "collectionsizereport.h"
 #include "../document.h"
 #include "../tellico_debug.h"
 
 #include <KLocalizedString>
 
 #include <QApplication>
 #include <QVBoxLayout>
 #include <QChartView>
 #include <QLineSeries>
 #include <QDateTimeAxis>
 #include <QValueAxis>
 
 using namespace QtCharts;
 using Tellico::CollectionSizeReport;
 
 CollectionSizeReport::CollectionSizeReport() : ChartReport() {
 }
 
 QString CollectionSizeReport::title() const {
   return i18n("Collection Size");
 }
 
 QWidget* CollectionSizeReport::createWidget() {
   // create a new widget every time
   Data::CollPtr coll = Data::Document::self()->collection();
   Q_ASSERT(coll);
 
   const QString cdate = QStringLiteral("cdate");
   if(!coll->hasField(cdate)) {
     myDebug() << "No cdate field in collection";
     return nullptr;
   }
 
   int emptyCount = 0;
   QMap<QString, int> entryDateCounts;
   foreach(Data::EntryPtr entry, coll->entries()) {
     auto date = entry->field(cdate);
     if(date.isEmpty()) {
       emptyCount++;
     } else {
       entryDateCounts[date]++;
     }
   }
 
   auto series = new QLineSeries;
   const QStringList dates = entryDateCounts.keys(); // already sorted
   int totalCount = emptyCount; // assume empty values predate earliest date
   foreach(const QString& date, dates) {
     QDateTime momentInTime;
     momentInTime.setDate(QDate::fromString(date, Qt::ISODate));
     if(momentInTime.isValid()) {
       auto msecs = momentInTime.toMSecsSinceEpoch();
       // for a step chart, add a point just before this one with the previous total
       series->append(msecs-1, totalCount);
       totalCount += entryDateCounts.value(date);
       series->append(msecs, totalCount);
     }
   }
   // add current date
   QDateTime now = QDateTime::currentDateTimeUtc();
   series->append(now.toMSecsSinceEpoch(), coll->entryCount());
   series->setName(i18n("Total entries: %1", coll->entryCount()));
 
   auto chart = new QChart;
   chart->addSeries(series);
   chart->setTitle(i18n("Collection Size Over Time"));
   chart->setTheme(qApp->palette().color(QPalette::Window).lightnessF() < 0.25 ? QChart::ChartThemeDark
                                                                               : QChart::ChartThemeLight);
   QFont f = chart->titleFont();
   int fontSize = f.pointSize();
   if(fontSize > 0) {
     f.setPointSize(qRound(fontSize * 1.3));
   } else {
     f.setPixelSize(qRound(f.pixelSize() * 1.3));
   }
   f.setWeight(QFont::Bold);
   chart->setTitleFont(f);
 
   QPen pen = series->pen();
   pen.setWidth(3);
   series->setPen(pen);
 
   auto axisX = new QDateTimeAxis;
   axisX->setTickCount(10);
   axisX->setFormat(QStringLiteral("MMM yyyy"));
   chart->addAxis(axisX, Qt::AlignBottom);
   series->attachAxis(axisX);
 
   auto axisY = new QValueAxis;
   axisY->setLabelFormat(QStringLiteral("%d"));
   axisY->setTitleText(i18n("Collection Size"));
   chart->addAxis(axisY, Qt::AlignLeft);
   series->attachAxis(axisY);
   if(axisY->max() < 5) axisY->setMax(5);
   axisY->applyNiceNumbers();
 
   auto widget = new QWidget;
   auto layout = new QVBoxLayout(widget);
   layout->setMargin(0);
   layout->setSpacing(0);
   auto chartView = new QChartView(chart, widget);
   chartView->setRenderHint(QPainter::Antialiasing);
   // avoid a transparent frame around the chart
   chartView->setBackgroundBrush(chart->backgroundBrush());
   layout->addWidget(chartView);
   widget->setLayout(layout);
   return widget;
 }