Qt之绘制折线图：图标以及坐标轴设置

一、建立QT GUI应用，基类选择"QMainWindows"，在.pro中添加：

QT       += charts

在源文件中添加：

#include  <QtCharts>

二、在构造函数中添加：

QChartView *chartView = new QChartView(this);

QChartView *chartView = new QChartView(this);

    QChart *chart = new QChart();
    chart->setTitle("简单函数曲线");   //图标的名字
    chartView->setChart(chart);
    setCentralWidget(chartView);

QChartView *chartView = new QChartView(this);

    QChart *chart = new QChart();
    chart->setTitle("简单函数曲线");   //图标的名字
    chartView->setChart(chart);
    setCentralWidget(chartView);

    //建立曲线序列
    QLineSeries *series0 = new QLineSeries();
    QLineSeries *series1 = new QLineSeries();
    series0->setName("sin曲线");   //自动添加折线名字
    series1->setName("cos曲线");
    chart->addSeries(series0);
    chart->addSeries(series1);

QChartView *chartView = new QChartView(this);

    QChart *chart = new QChart();
    chart->setTitle("简单函数曲线");   //图标的名字
    chartView->setChart(chart);
    setCentralWidget(chartView);

    //建立曲线序列
    QLineSeries *series0 = new QLineSeries();
    QLineSeries *series1 = new QLineSeries();
    series0->setName("sin曲线");   //自动添加折线名字
    series1->setName("cos曲线");
    chart->addSeries(series0);
    chart->addSeries(series1);

    //序列添加数值
    qreal t = 0, y1, y2, intv = 0.1;
    int cnt = 200;
    for(int i = 0; i < cnt; ++i){
        y1 = qSin(t);
        series0->append(t, y1);

        y2=qSin(t+20);
        series1->append(t,y2);

        t+=intv;  //每次角度增长
    }

    //建立坐标
    QValueAxis *axisX = new QValueAxis;
    axisX->setRange(0, 10);//设置坐标轴范围
    axisX->setTitleText("time(secs)");//标题
    axisX->setLabelFormat("%.1f"); //标签格式：每一个单位保留几位小数
    axisX->setTickCount(20); //主分隔个数：0到10分红20个单位
    axisX->setMinorTickCount(4); //每一个单位之间绘制了多少虚网线
//    axisX->setGridLineVisible(false);

    QValueAxis *axisY = new QValueAxis; //Y 轴
    axisY->setRange(-2, 2);
    axisY->setTitleText("value");
    axisY->setLabelFormat("%.2f"); //标签格式
    axisY->setTickCount(10);
    axisY->setMinorTickCount(4);
//    axisX->setGridLineVisible(false);

    //为序列设置坐标轴
    chart->setAxisX(axisX, series0);
    chart->setAxisY(axisY, series0);

    chart->setAxisX(axisX, series1);
    chart->setAxisY(axisY, series1);