src/ChartCarbonate.cpp

/**
 * ChartCarbonate.cpp is part of bmsapp.
 *
 * bmsapp 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 3 of the License, or
 * (at your option) any later version.
 *
 * bmsapp 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 "ChartCarbonate.h"
#include "callout.h"
#include "MainWindow.h"


ChartCarbonate::ChartCarbonate(QString code, QString name, QWidget *parent) : QDialog(parent)
{
    QSqlQuery query;
    double timestamp;

    qDebug() << "ChartCarbonate:" << code << name;

    QDialog* dialog = new QDialog(parent);
    dialog->setWindowTitle(tr("BMSapp - Carbonation ") + "\"" + name + "\"");
    dialog->setObjectName(QString::fromUtf8("ChartCarbonate"));
    dialog->setWindowFlags(Qt::Window | Qt::WindowTitleHint | Qt::CustomizeWindowHint);
    dialog->resize(1024, 600);

    QPushButton *saveButton = new QPushButton(tr("Save"));
    saveButton->setAutoDefault(false);
    QIcon icon1;
    icon1.addFile(QString::fromUtf8(":icons/silk/disk.png"), QSize(), QIcon::Normal, QIcon::Off);
    saveButton->setIcon(icon1);

    QDialogButtonBox *buttonBox = new QDialogButtonBox(dialog);
    buttonBox->setObjectName(QString::fromUtf8("buttonBox"));
    buttonBox->setOrientation(Qt::Vertical);
    buttonBox->setStandardButtons(QDialogButtonBox::Ok);
    buttonBox->addButton(saveButton,QDialogButtonBox::ActionRole);

    temperature = new QSplineSeries();
    pressure = new QSplineSeries();

    query.prepare("SELECT * FROM log_co2pressure WHERE code=:code ORDER BY datetime");
    query.bindValue(":code", code);
    query.exec();
    while (query.next()) {
        timestamp = query.value("datetime").toDateTime().toSecsSinceEpoch() * 1000;
        temperature->append(timestamp, query.value("temperature").toDouble());
        pressure->append(timestamp, query.value("pressure").toDouble());
    }

    temperature->setName(tr("Temperature °C"));
    temperature->setColor(QColorConstants::Svg::red);
    pressure->setName(tr("Pressure bar"));
    QPen pen(QColorConstants::Svg::navy);
    pen.setWidth(2);
    pressure->setPen(pen);

    chart = new QChart();
    chart->setTitle(QString("%1 \"%2\"").arg(code).arg(name));
    chart->addSeries(temperature);
    chart->addSeries(pressure);

    QDateTimeAxis *axisX = new QDateTimeAxis;
    axisX->setTickCount(10);
    axisX->setFormat("dd MMM");
    axisX->setTitleText(tr("Date"));
    axisX->setLabelsFont(QFont("Helvetica", 8, QFont::Normal));
    chart->addAxis(axisX, Qt::AlignBottom);
    temperature->attachAxis(axisX);
    pressure->attachAxis(axisX);

    QValueAxis *axisYT = new QValueAxis;
    axisYT->setRange(14.0, 25.0);
    axisYT->setTickCount(12);
    axisYT->setLabelFormat("%.1f");
    axisYT->setTitleText(tr("Temperature °C"));
    axisYT->setLabelsFont(QFont("Helvetica", 8, QFont::Normal));
    chart->addAxis(axisYT, Qt::AlignRight);
    temperature->attachAxis(axisYT);

    QValueAxis *axisYP = new QValueAxis;
    axisYP->setRange(0, 5.5);
    axisYP->setTickCount(12);
    axisYP->setLabelFormat("%.1f");
    axisYP->setTitleText(tr("Pressure bar"));
    axisYP->setLabelsFont(QFont("Helvetica", 8, QFont::Normal));
    chart->addAxis(axisYP, Qt::AlignLeft);
    pressure->attachAxis(axisYP);

    chart->setAcceptHoverEvents(true);

    connect(temperature, &QSplineSeries::hovered, this, &ChartCarbonate::tooltip);
    connect(pressure, &QSplineSeries::hovered, this, &ChartCarbonate::tooltip);

    chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);
    dialog->setLayout(new QHBoxLayout);
    dialog->layout()->addWidget(chartView);
    dialog->layout()->addWidget(buttonBox);

    QObject::connect(buttonBox, SIGNAL(accepted()), dialog, SLOT(accept()));
    QObject::connect(buttonBox, SIGNAL(rejected()), dialog, SLOT(reject()));
    QObject::connect(saveButton, SIGNAL(clicked()), this, SLOT(savePNG()));

    dialog->setModal(true);
    dialog->exec();
}


ChartCarbonate::~ChartCarbonate() {}


void ChartCarbonate::savePNG()
{
    QSettings settings(QSettings::IniFormat, QSettings::UserScope, "mbse", "bmsapp");
    QString dirName;

    /*
     * First check if the directory stored in the settings file exists.
     * It might be on a removable media that was last used ...
     * If so, fallback to the user's home directory.
     */
    dirName = settings.value("paths/download").toString();
    if (! QDir(dirName).exists()) {
	dirName = QDir::homePath();
    }

    QString path = QFileDialog::getSaveFileName(this, tr("Save Image"), dirName + "/carbonation.png", tr("Image (*.png)"));
    if (path.isEmpty()) {
	QMessageBox::warning(this, tr("Save File"), tr("No image file selected."));
	return;
    }

    /*
     * Update to current selected path
     */
    settings.setValue("paths/download", QFileInfo(path).absolutePath());

    QImage img((chartView->size()), QImage::Format_ARGB32);
    QPainter painter;
    painter.begin(&img);
    chartView->render(&painter);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.end();
    img.save(path);
}


void ChartCarbonate::tooltip(QPointF point, bool state)
{
    QAbstractSeries *series = qobject_cast<QAbstractSeries *>(sender());

    if (t_tooltip == 0)
        t_tooltip = new Callout(chart, series);

    if (state) {
	QDateTime timeis = QDateTime::fromMSecsSinceEpoch(point.x());
	QString suffix = (series == temperature) ? "°C":" bar";
	t_tooltip->setSeries(series);
	t_tooltip->setText(QString("%1\n%2%3").arg(timeis.toString("dd-MM-yyyy hh:mm")).arg(point.y(), 2, 'f', 1).arg(suffix));
	t_tooltip->setAnchor(point);
	t_tooltip->setZValue(11);
	t_tooltip->updateGeometry();
	t_tooltip->show();
    } else {
	t_tooltip->hide();
    }
}