QT实现简单曲线图

首先用到的控件为QGraphicsView

使用到的头文件

#include <QChart>

#include <QChartView>

#include <QtWidgets/QMainWindow>

#include <QWidget>
在QT Pro文件当中 需要添加QT += charts
另外 在头文件中 也需要声明
#include <QtCharts>

QT_CHARTS_USE_NAMESPACE

说明将要会使用到图表
.cpp文件核心代码
 QChart *pChart = new QChart();

    pChart->setTitle("简单函数曲线");

    ui->graphicsView->setChart(pChart);

    QLineSeries *series0 = new QLineSeries();

    QLineSeries *series1 = new QLineSeries();

    series0->setName("sin曲线");

    series1->setName("Cos曲线");

    pChart->addSeries(series0);

    pChart->addSeries(series1);

    // 序列添加数值

    qreal t = 0,y1,y2,intv = 0.1;

    int cnt = 100;

    for(int nIndex = 0; nIndex != cnt; nIndex++)

    {

        y1 = qSin(t);

        series0->append(t,y1);

        y2 = qSin(t+20);

        series1->append(t,y2);

        t+=intv;

    }

    // 创建坐标轴

    QValueAxis *axisX = new QValueAxis;

    axisX->setRange(0,10);

    axisX->setTitleText("Time"); // 标题

    QValueAxis *axisY = new QValueAxis;

    axisY->setRange(-2,2);

    axisY->setTitleText("Value"); // 标题

　　// 为序列设置坐标轴

    pChart->setAxisX(axisX,series0);

    pChart->setAxisY(axisY,series0);

    pChart->setAxisX(axisX,series1);

    pChart->setAxisY(axisY,series1);