Question

我尝试使用qt库qcustomplot绘制一个用户通过鼠标拍摄的图表。

我尝试过这样的事情：

void MainWindow::makePlot()
{
    ui->customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectAxes |
                                QCP::iSelectLegend | QCP::iSelectPlottables);
    ui->customPlot->xAxis->setRange(-8, 8);
    ui->customPlot->yAxis->setRange(-5, 5);
    ui->customPlot->axisRect()->setupFullAxesBox();

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

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

    ui->customPlot->rescaleAxes();

    // connect slot that ties some axis selections together (especially opposite axes):
    connect(ui->customPlot, SIGNAL(selectionChangedByUser()), this, SLOT(selectionChanged()));
    // connect slots that takes care that when an axis is selected, only that direction can be dragged and zoomed:
    connect(ui->customPlot, SIGNAL(mousePress(QMouseEvent*)), this, SLOT(mousePress()));
    connect(ui->customPlot, SIGNAL(mouseWheel(QWheelEvent*)), this, SLOT(mouseWheel()));

    // make bottom and left axes transfer their ranges to top and right axes:
    connect(ui->customPlot->xAxis, SIGNAL(rangeChanged(QCPRange)), ui->customPlot->xAxis2, SLOT(setRange(QCPRange)));
    connect(ui->customPlot->yAxis, SIGNAL(rangeChanged(QCPRange)), ui->customPlot->yAxis2, SLOT(setRange(QCPRange)));

    // connect some interaction slots:
    connect(ui->customPlot, SIGNAL(axisDoubleClick(QCPAxis*,QCPAxis::SelectablePart,QMouseEvent*)), this, SLOT(axisLabelDoubleClick(QCPAxis*,QCPAxis::SelectablePart)));
    connect(ui->customPlot, SIGNAL(legendDoubleClick(QCPLegend*,QCPAbstractLegendItem*,QMouseEvent*)), this, SLOT(legendDoubleClick(QCPLegend*,QCPAbstractLegendItem*)));
    connect(title, SIGNAL(doubleClicked(QMouseEvent*)), this, SLOT(titleDoubleClick(QMouseEvent*)));

    // connect slot that shows a message in the status bar when a graph is clicked:
    connect(ui->customPlot, SIGNAL(plottableClick(QCPAbstractPlottable*,int,QMouseEvent*)), this, SLOT(graphClicked(QCPAbstractPlottable*,int)));

    // setup policy and connect slot for context menu popup:
    ui->customPlot->setContextMenuPolicy(Qt::CustomContextMenu);
    connect(ui->customPlot, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(contextMenuRequest(QPoint)));


}

是否可以使用此库，我该怎么做？如果你能告诉我任何一个例子，我将不胜感激。

使用qcustom绘图用鼠标绘制图形

0 个答案: