qcustomplotdemo/mainwindow.cpp at main · replicam/qcustomplotdemo · GitHub

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#include "mainwindow.h"

const char instructionsTxt[] =
		"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \"http://www.w3.org/TR/REC-html40/strict.dtd\">\n"
		       "<html><head><meta name=\"qrichtext\" content=\"1\" /><style type=\"text/css\">\n"
		       "p, li { white-space: pre-wrap; }\n"
		       "</style></head><body style=\" font-family:'Ubuntu'; font-size:11pt; font-weight:400; font-style:normal;\">\n"
		       "<p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\"><span style=\" font-weight:600;\">Select the axes</span> to drag and zoom them individually.</p>\n"
		       "<p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\"><span style=\" font-weight:600;\">Left click</span> on graphs or legend to select graphs.</p>\n"
		       "</body></html>";

const char titleTxt[] = "QCustomPlot Interaction and Realtime example";

MainWindow::MainWindow(QWidget *parent) :
	QMainWindow(parent) {
    //srand(QDateTime::currentDateTime().toTime_t());

	// Layout
	centralWidget = new QWidget();
	verticalLayout = new QVBoxLayout(centralWidget);
	verticalLayout->setSpacing(6);
	verticalLayout->setContentsMargins(11, 11, 11, 11);
	frame_2 = new QFrame(centralWidget);
	frame_2->setFrameShape(QFrame::StyledPanel);
	frame_2->setFrameShadow(QFrame::Sunken);
	frame_2->setLineWidth(1);
	frame_2->setMidLineWidth(0);
	verticalLayout_3 = new QVBoxLayout(frame_2);
	verticalLayout_3->setSpacing(0);
	verticalLayout_3->setContentsMargins(0, 0, 0, 0);
	customPlot = new QCustomPlot(frame_2);
	QSizePolicy sizePolicy(QSizePolicy::Preferred, QSizePolicy::MinimumExpanding);
	sizePolicy.setHorizontalStretch(0);
	sizePolicy.setVerticalStretch(0);
	sizePolicy.setHeightForWidth(customPlot->sizePolicy().hasHeightForWidth());
	customPlot->setSizePolicy(sizePolicy);
	verticalLayout_3->addWidget(customPlot);
	verticalLayout->addWidget(frame_2);
	frame = new QFrame(centralWidget);
	frame->setFrameShape(QFrame::StyledPanel);
	frame->setFrameShadow(QFrame::Raised);
	verticalLayout_2 = new QVBoxLayout(frame);
	verticalLayout_2->setSpacing(6);
	verticalLayout_2->setContentsMargins(11, 11, 11, 11);
	label = new QLabel(frame);
	verticalLayout_2->addWidget(label);
	verticalLayout->addWidget(frame);
	setCentralWidget(centralWidget);
	statusBar = new QStatusBar();
	setStatusBar(statusBar);

	customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectAxes |
				    QCP::iSelectLegend | QCP::iSelectPlottables);
	customPlot->xAxis->setRange(-1, 8);
	customPlot->yAxis->setRange(-5, 5);
	customPlot->axisRect()->setupFullAxesBox();

	customPlot->plotLayout()->insertRow(0);
	QCPTextElement *title = new QCPTextElement(customPlot, titleTxt, QFont("sans", 17, QFont::Bold));
	customPlot->plotLayout()->addElement(0, 0, title);

	customPlot->xAxis->setLabel("x Axis");
	customPlot->yAxis->setLabel("y Axis");
	customPlot->legend->setVisible(true);
	QFont legendFont = font();
	legendFont.setPointSize(10);
	customPlot->legend->setFont(legendFont);
	customPlot->legend->setSelectedFont(legendFont);
	customPlot->legend->setSelectableParts(QCPLegend::spItems); // legend box shall not be selectable, only legend items

	addRealtimeGraph();
	addRandomGraph();
	addRandomGraph();

	// mouse events callbacks
	connect(customPlot, &QCustomPlot::mousePress,
		this, &MainWindow::mousePress);
	connect(customPlot, &QCustomPlot::mouseWheel,
		this, &MainWindow::mouseWheel);

	// connect callback that shows a message in the status bar when a graph is clicked:
	connect(customPlot, &QCustomPlot::plottableClick,
		this, &MainWindow::graphClicked);

	setWindowTitle(titleTxt);
	label->setText(instructionsTxt);
}

void MainWindow::mousePress() {
	// if an axis is selected, only allow the direction of that axis to be dragged
	// if no axis is selected, both directions may be dragged

	if (customPlot->xAxis->selectedParts().testFlag(QCPAxis::spAxis))
		customPlot->axisRect()->setRangeDrag(customPlot->xAxis->orientation());
	else if (customPlot->yAxis->selectedParts().testFlag(QCPAxis::spAxis))
		customPlot->axisRect()->setRangeDrag(customPlot->yAxis->orientation());
	else
		customPlot->axisRect()->setRangeDrag(Qt::Horizontal|Qt::Vertical);
}

void MainWindow::mouseWheel() {
	// if an axis is selected, only allow the direction of that axis to be zoomed
	// if no axis is selected, both directions may be zoomed

	if (customPlot->xAxis->selectedParts().testFlag(QCPAxis::spAxis))
		customPlot->axisRect()->setRangeZoom(customPlot->xAxis->orientation());
	else if (customPlot->yAxis->selectedParts().testFlag(QCPAxis::spAxis))
		customPlot->axisRect()->setRangeZoom(customPlot->yAxis->orientation());
	else
		customPlot->axisRect()->setRangeZoom(Qt::Horizontal|Qt::Vertical);
}

void MainWindow::addRealtimeGraph() {
	customPlot->addGraph();
	customPlot->graph()->setName(QString("Realtime"));
	animdata.reset(new QCPDataContainer<QCPGraphData>);
	for(int i=0;i<nRealtimePoints;i++) {
		QCPGraphData data(i*dt,0);
		animdata->add(data);
	}
	customPlot->graph()->setData(animdata);
	QPen graphPen;
	graphPen.setColor(QColor(rand()%245+10, rand()%245+10, rand()%245+10));
	graphPen.setWidthF(2);
	customPlot->graph()->setPen(graphPen);
	customPlot->replot();
	startTimer(40);
}

void MainWindow::addRealtimeSample(double v) {
	// shift the values
	for (auto i = animdata->end(); i != (animdata->begin()); --i) {
		i->value = (i-1)->value;
	}
	// add a new datapoint at the start
	animdata->begin()->value = v;
}

void MainWindow::timerEvent( QTimerEvent * ) {
	// demonstrates that adding a few samples before plotting speeds things up
	for(int i = 0; i < 5; i++) {
		addRealtimeSample(sin(t*5));
		t = t + dt;
	}
	customPlot->replot();
}

void MainWindow::addRandomGraph() {
	int n = 2000; // number of points in graph
	double xScale = (rand()/(double)RAND_MAX + 0.5)*2;
	double yScale = (rand()/(double)RAND_MAX + 0.5)*2;
	double xOffset = (rand()/(double)RAND_MAX - 0.5)*4;
	double yOffset = (rand()/(double)RAND_MAX - 0.5)*10;
	double r1 = (rand()/(double)RAND_MAX - 0.5)*2;
	double r2 = (rand()/(double)RAND_MAX - 0.5)*2;
	double r3 = (rand()/(double)RAND_MAX - 0.5)*2;
	double r4 = (rand()/(double)RAND_MAX - 0.5)*2;
	QVector<double> x(n), y(n);
	for (int i=0; i<n; i++)
	{
		x[i] = (i/(double)n-0.5)*10.0*xScale + xOffset;
		y[i] = (qSin(x[i]*r1*5)*qSin(qCos(x[i]*r2)*r4*3)+r3*qCos(qSin(x[i])*r4*2))*yScale + yOffset;
	}

	customPlot->addGraph();
	customPlot->graph()->setName(QString("New graph %1").arg(customPlot->graphCount()-1));
	customPlot->graph()->setData(x, y);
	QPen graphPen;
	graphPen.setColor(QColor(rand()%245+10, rand()%245+10, rand()%245+10));
	graphPen.setWidthF(2);
	customPlot->graph()->setPen(graphPen);
	customPlot->replot();
}

void MainWindow::removeSelectedGraph() {
	if (customPlot->selectedGraphs().size() > 0)
	{
		customPlot->removeGraph(customPlot->selectedGraphs().first());
		customPlot->replot();
	}
}

void MainWindow::removeAllGraphs() {
	customPlot->clearGraphs();
	customPlot->replot();
}

void MainWindow::moveLegend() {
	if (QAction* contextAction = qobject_cast<QAction*>(sender())) // make sure this slot is really called by a context menu action, so it carries the data we need
	{
		bool ok;
		int dataInt = contextAction->data().toInt(&ok);
		if (ok)
		{
			customPlot->axisRect()->insetLayout()->setInsetAlignment(0, (Qt::Alignment)dataInt);
			customPlot->replot();
		}
	}
}

void MainWindow::graphClicked(QCPAbstractPlottable *plottable, int dataIndex) {
	// since we know we only have QCPGraphs in the plot, we can immediately access interface1D()
	// usually it's better to first check whether interface1D() returns non-zero, and only then use it.
	double dataValue = plottable->interface1D()->dataMainValue(dataIndex);
	QString message = QString("Clicked on graph '%1' at data point #%2 with value %3.").arg(plottable->name()).arg(dataIndex).arg(dataValue);
	statusBar->showMessage(message, 2500);
}