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