Qt之繪製折線圖：圖標以及座標軸設置

一、建立QT GUI應用，基類選擇"QMainWindows"，在.pro中添加：

QT       += charts

在源文件中添加：

#include  <QtCharts>

二、在構造函數中添加：

QChartView *chartView = new QChartView(this);

QChartView *chartView = new QChartView(this);

    QChart *chart = new QChart();
    chart->setTitle("簡單函數曲線");   //圖標的名字
    chartView->setChart(chart);
    setCentralWidget(chartView);

QChartView *chartView = new QChartView(this);

    QChart *chart = new QChart();
    chart->setTitle("簡單函數曲線");   //圖標的名字
    chartView->setChart(chart);
    setCentralWidget(chartView);

    //建立曲線序列
    QLineSeries *series0 = new QLineSeries();
    QLineSeries *series1 = new QLineSeries();
    series0->setName("sin曲線");   //自動添加折線名字
    series1->setName("cos曲線");
    chart->addSeries(series0);
    chart->addSeries(series1);

QChartView *chartView = new QChartView(this);

    QChart *chart = new QChart();
    chart->setTitle("簡單函數曲線");   //圖標的名字
    chartView->setChart(chart);
    setCentralWidget(chartView);

    //建立曲線序列
    QLineSeries *series0 = new QLineSeries();
    QLineSeries *series1 = new QLineSeries();
    series0->setName("sin曲線");   //自動添加折線名字
    series1->setName("cos曲線");
    chart->addSeries(series0);
    chart->addSeries(series1);

    //序列添加數值
    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;  //每次角度增長
    }

    //建立座標
    QValueAxis *axisX = new QValueAxis;
    axisX->setRange(0, 10);//設置座標軸範圍
    axisX->setTitleText("time(secs)");//標題
    axisX->setLabelFormat("%.1f"); //標籤格式：每一個單位保留幾位小數
    axisX->setTickCount(20); //主分隔個數：0到10分紅20個單位
    axisX->setMinorTickCount(4); //每一個單位之間繪製了多少虛網線
//    axisX->setGridLineVisible(false);

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

    //爲序列設置座標軸
    chart->setAxisX(axisX, series0);
    chart->setAxisY(axisY, series0);

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