15.QT中qchart绘制图表注意事项

第一步：在ui中，拖拽一个widget组件。右键提升为QChartView类

第 二步：在构造函数中添加如下chart相关代码

    m_Chart = new QChart();
    m_Series = new QLineSeries();

    m_Series->append(QPointF(100, 100));
    m_Series->append(QPointF(110, 110));
    m_Series->append(QPointF(120, 130));
    m_Series->append(QPointF(130, 120));

    m_Series->setPointsVisible(true);  //设置点可见

    m_Chart->addSeries(m_Series); //添加数据，添加数据要在添加坐标轴之前

    m_Chart->setTitle("xxxx"); //设置图表，标题

    //创建坐标轴
    QValueAxis * axisX = new QValueAxis();
    QValueAxis * axisY = new QValueAxis();

    axisX->setRange(100, 150);
    axisY->setRange(100, 150);

    //设置刻度
    axisX->setTickCount(6);
    axisY->setTickCount(6); // (max - min)/(count-1)

    // *** 将坐标轴刻度与数据进行关联，如果m_Series 图表就乱了，数据对不上
    m_Chart->setAxisX(axisX, m_Series);
    m_Chart->setAxisY(axisY, m_Series);

    m_Chart->legend()->setVisible(true);

    ui->widget->resize(400, 300);
    ui->widget->setChart(m_Chart);
    ui->widget->setRenderHint(QPainter::Antialiasing);

   第3步：效果如图