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Plot Screenshots: Logarithmic Axis Demo

 customPlot->setNoAntialiasingOnDrag(true); // more performance/responsiveness during dragging
 customPlot->addGraph();
 QPen pen;
 pen.setColor(QColor(255,170,100));
 pen.setWidth(2);
 pen.setStyle(Qt::DotLine);
 customPlot->graph(0)->setPen(pen);
 customPlot->graph(0)->setName("x");
 
 customPlot->addGraph();
 customPlot->graph(1)->setPen(QPen(Qt::red));
 customPlot->graph(1)->setBrush(QBrush(QColor(255, 0, 0, 20)));
 customPlot->graph(1)->setName("-sin(x)exp(x)");
 
 customPlot->addGraph();
 customPlot->graph(2)->setPen(QPen(Qt::blue));
 customPlot->graph(2)->setBrush(QBrush(QColor(0, 0, 255, 20)));
 customPlot->graph(2)->setName(" sin(x)exp(x)");
 
 customPlot->addGraph();
 pen.setColor(QColor(0,0,0));
 pen.setWidth(1);
 pen.setStyle(Qt::DashLine);
 customPlot->graph(3)->setPen(pen);
 customPlot->graph(3)->setBrush(QBrush(QColor(0,0,0,15)));
 customPlot->graph(3)->setLineStyle(QCPGraph::lsStepCenter);
 customPlot->graph(3)->setName("x!");
 
 const int dataCount = 200;
 const int dataFactorialCount = 21;
 QVector<QCPGraphData> dataLinear(dataCount), dataMinusSinExp(dataCount), dataPlusSinExp(dataCount), dataFactorial(dataFactorialCount);
 for (int i=0; i<dataCount; ++i)
 {
 dataLinear[i].key = i/10.0;
 dataLinear[i].value = dataLinear[i].key;
 dataMinusSinExp[i].key = i/10.0;
 dataMinusSinExp[i].value = -qSin(dataMinusSinExp[i].key)*qExp(dataMinusSinExp[i].key);
 dataPlusSinExp[i].key = i/10.0;
 dataPlusSinExp[i].value = qSin(dataPlusSinExp[i].key)*qExp(dataPlusSinExp[i].key);
 }
 for (int i=0; i<dataFactorialCount; ++i)
 {
 dataFactorial[i].key = i;
 dataFactorial[i].value = 1.0;
 for (int k=1; k<=i; ++k) dataFactorial[i].value *= k; // factorial
 }
 customPlot->graph(0)->data()->set(dataLinear);
 customPlot->graph(1)->data()->set(dataMinusSinExp);
 customPlot->graph(2)->data()->set(dataPlusSinExp);
 customPlot->graph(3)->data()->set(dataFactorial);
 customPlot->yAxis->grid()->setSubGridVisible(true);
 customPlot->xAxis->grid()->setSubGridVisible(true);
 customPlot->yAxis->setScaleType(QCPAxis::stLogarithmic);
 customPlot->yAxis2->setScaleType(QCPAxis::stLogarithmic);
 QSharedPointer<QCPAxisTickerLog> logTicker(new QCPAxisTickerLog);
 customPlot->yAxis->setTicker(logTicker);
 customPlot->yAxis2->setTicker(logTicker);
 customPlot->yAxis->setNumberFormat("eb"); // e = exponential, b = beautiful decimal powers
 customPlot->yAxis->setNumberPrecision(0); // makes sure "1*10^4" is displayed only as "10^4"
 customPlot->xAxis->setRange(0, 19.9);
 customPlot->yAxis->setRange(1e-2, 1e10);
 // make range draggable and zoomable:
 customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom);
 
 // make top right axes clones of bottom left axes:
 customPlot->axisRect()->setupFullAxesBox();
 // connect signals so top and right axes move in sync with bottom and left axes:
 connect(customPlot->xAxis, SIGNAL(rangeChanged(QCPRange)), customPlot->xAxis2, SLOT(setRange(QCPRange)));
 connect(customPlot->yAxis, SIGNAL(rangeChanged(QCPRange)), customPlot->yAxis2, SLOT(setRange(QCPRange)));
 
 customPlot->legend->setVisible(true);
 customPlot->legend->setBrush(QBrush(QColor(255,255,255,150)));
 customPlot->axisRect()->insetLayout()->setInsetAlignment(0, Qt::AlignLeft|Qt::AlignTop); // make legend align in top left corner or axis rect