qt_demoe/third/qcustomplotdemo/frmexample/frmadvancedaxes.cpp

#include "frmadvancedaxes.h"
#include "ui_frmadvancedaxes.h"
#include "qdebug.h"

frmAdvancedAxes::frmAdvancedAxes(QWidget *parent) : QWidget(parent), ui(new Ui::frmAdvancedAxes)
{
    ui->setupUi(this);
    this->initForm();
}

frmAdvancedAxes::~frmAdvancedAxes()
{
    delete ui;
}

void frmAdvancedAxes::initForm()
{
    // configure axis rect:
    ui->customPlot->plotLayout()->clear(); // clear default axis rect so we can start from scratch

    QCPAxisRect *wideAxisRect = new QCPAxisRect(ui->customPlot);
    wideAxisRect->setupFullAxesBox(true);
    wideAxisRect->axis(QCPAxis::atRight, 0)->setTickLabels(true);
    wideAxisRect->addAxis(QCPAxis::atLeft)->setTickLabelColor(QColor("#6050F8")); // add an extra axis on the left and color its numbers

    QCPLayoutGrid *subLayout = new QCPLayoutGrid;
    ui->customPlot->plotLayout()->addElement(0, 0, wideAxisRect); // insert axis rect in first row
    ui->customPlot->plotLayout()->addElement(1, 0, subLayout); // sub layout in second row (grid layout will grow accordingly)
    //ui->customPlot->plotLayout()->setRowStretchFactor(1, 2);

    // prepare axis rects that will be placed in the sublayout:
    QCPAxisRect *subRectLeft = new QCPAxisRect(ui->customPlot, false); // false means to not setup default axes
    QCPAxisRect *subRectRight = new QCPAxisRect(ui->customPlot, false);
    subLayout->addElement(0, 0, subRectLeft);
    subLayout->addElement(0, 1, subRectRight);
    subRectRight->setMaximumSize(100, 100); // make bottom right axis rect size fixed 100x100
    subRectRight->setMinimumSize(100, 100); // make bottom right axis rect size fixed 100x100

    // setup axes in sub layout axis rects:
    subRectLeft->addAxes(QCPAxis::atBottom | QCPAxis::atLeft);
    subRectRight->addAxes(QCPAxis::atBottom | QCPAxis::atRight);
    subRectLeft->axis(QCPAxis::atLeft)->ticker()->setTickCount(2);
    subRectRight->axis(QCPAxis::atRight)->ticker()->setTickCount(2);
    subRectRight->axis(QCPAxis::atBottom)->ticker()->setTickCount(2);
    subRectLeft->axis(QCPAxis::atBottom)->grid()->setVisible(true);

    // synchronize the left and right margins of the top and bottom axis rects:
    QCPMarginGroup *marginGroup = new QCPMarginGroup(ui->customPlot);
    subRectLeft->setMarginGroup(QCP::msLeft, marginGroup);
    subRectRight->setMarginGroup(QCP::msRight, marginGroup);
    wideAxisRect->setMarginGroup(QCP::msLeft | QCP::msRight, marginGroup);

    // move newly created axes on "axes" layer and grids on "grid" layer:
    foreach (QCPAxisRect *rect, ui->customPlot->axisRects()) {
        foreach (QCPAxis *axis, rect->axes()) {
            axis->setLayer("axes");
            axis->grid()->setLayer("grid");
        }
    }

    // prepare data:
    QVector<QCPGraphData> dataCos(21), dataGauss(50), dataRandom(100);
    QVector<double> x3, y3;
    std::srand(3);
    for (int i = 0; i < dataCos.size(); ++i) {
        dataCos[i].key = i / (double)(dataCos.size() - 1) * 10 - 5.0;
        dataCos[i].value = qCos(dataCos[i].key);
    }
    for (int i = 0; i < dataGauss.size(); ++i) {
        dataGauss[i].key = i / (double)dataGauss.size() * 10 - 5.0;
        dataGauss[i].value = qExp(-dataGauss[i].key * dataGauss[i].key * 0.2) * 1000;
    }
    for (int i = 0; i < dataRandom.size(); ++i) {
        dataRandom[i].key = i / (double)dataRandom.size() * 10;
        dataRandom[i].value = std::rand() / (double)RAND_MAX - 0.5 + dataRandom[qMax(0, i - 1)].value;
    }
    x3 << 1 << 2 << 3 << 4;
    y3 << 2 << 2.5 << 4 << 1.5;

    // create and configure plottables:
    QCPGraph *mainGraphCos = ui->customPlot->addGraph(wideAxisRect->axis(QCPAxis::atBottom), wideAxisRect->axis(QCPAxis::atLeft));
    mainGraphCos->data()->set(dataCos);
    mainGraphCos->valueAxis()->setRange(-1, 1);
    mainGraphCos->rescaleKeyAxis();
    mainGraphCos->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssCircle, QPen(Qt::black), QBrush(Qt::white), 6));
    mainGraphCos->setPen(QPen(QColor(120, 120, 120), 2));

    QCPGraph *mainGraphGauss = ui->customPlot->addGraph(wideAxisRect->axis(QCPAxis::atBottom), wideAxisRect->axis(QCPAxis::atLeft, 1));
    mainGraphGauss->data()->set(dataGauss);
    mainGraphGauss->setPen(QPen(QColor("#8070B8"), 2));
    mainGraphGauss->setBrush(QColor(110, 170, 110, 30));
    mainGraphCos->setChannelFillGraph(mainGraphGauss);
    mainGraphCos->setBrush(QColor(255, 161, 0, 50));
    mainGraphGauss->valueAxis()->setRange(0, 1000);
    mainGraphGauss->rescaleKeyAxis();

    QCPGraph *subGraphRandom = ui->customPlot->addGraph(subRectLeft->axis(QCPAxis::atBottom), subRectLeft->axis(QCPAxis::atLeft));
    subGraphRandom->data()->set(dataRandom);
    subGraphRandom->setLineStyle(QCPGraph::lsImpulse);
    subGraphRandom->setPen(QPen(QColor("#FFA100"), 1.5));
    subGraphRandom->rescaleAxes();

    QCPBars *subBars = new QCPBars(subRectRight->axis(QCPAxis::atBottom), subRectRight->axis(QCPAxis::atRight));
    subBars->setWidth(3 / (double)x3.size());
    subBars->setData(x3, y3);
    subBars->setPen(QPen(Qt::black));
    subBars->setAntialiased(false);
    subBars->setAntialiasedFill(false);
    subBars->setBrush(QColor("#705BE8"));
    subBars->keyAxis()->setSubTicks(false);
    subBars->rescaleAxes();

    // setup a ticker for subBars key axis that only gives integer ticks:
    QSharedPointer<QCPAxisTickerFixed> intTicker(new QCPAxisTickerFixed);
    intTicker->setTickStep(1.0);
    intTicker->setScaleStrategy(QCPAxisTickerFixed::ssMultiples);
    subBars->keyAxis()->setTicker(intTicker);
    ui->customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom);
}