QtQChart实现折线图的绘制

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
 
#include <QtCharts>
#include <QChartView>
#include <QSplineSeries>
 
QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
 
private slots:
    void on_pushButton_clicked();
 
    void on_pushButton_2_clicked();
 
private:
    Ui::MainWindow *ui;
 
};
 
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
#pragma execution_character_set("utf-8")
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
 
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_pushButton_clicked()
{
    QLineSeries *lineSeries = new QLineSeries();        //创建折线系列
 
 
       QChartView *chartView = new QChartView(this);
 
 
       
 
       for(quint8 i=0; i<100; i++)
 
       {
 
           lineSeries->append(i,qrand()%300);
 
       }
 
 
       lineSeries->setName("red line");                  //设置系列名称
 
 
       QChart * mChart = new QChart();                          //创建图标对象
 
 
       mChart->addSeries(lineSeries);                  //向图表中添加系列
 
 
       mChart->createDefaultAxes();                       //创建默认的坐标，必须在addSeries之后调用
 
       mChart->setTheme(QChart::ChartThemeDark);           //设置图标主题
 
 
       mChart->setTitle("qrand");                       //设置图标名称
 
 
      // mChart->legend()->hide();                          //隐藏图例，也就是不显示系列名称了
 
 
       chartView->setChart(mChart);                    //向chartView中添加图标
 
 
       chartView->resize(QSize(500,300));              //重新设置chartView的大小
 
 
       chartView->setRenderHints(QPainter::Antialiasing);//消除边缘，看起来平滑一些
 
 
       ui->horizontalLayout->addWidget(chartView);     //把chartView放到水平布局中（在ui中拖一个水平布局）
}
 
void MainWindow::on_pushButton_2_clicked()
{
       QLineSeries *lineSeries = new QLineSeries();        //创建折线系列
       QChartView *chartView = new QChartView(this);
 
       for(quint8 i=0; i<100; i++)
       {
           lineSeries->append(i,qrand()%300);
       }
 
 
       lineSeries->setName("red line");
 
       QChart * mChart = new QChart();
       mChart->addSeries(lineSeries);
 
 
       //mChart->createDefaultAxes();
       QValueAxis *axisX = new QValueAxis;
       axisX->setRange(0, 300); //设置坐标轴范围
       axisX->setTickCount(5); //主分隔个数
       axisX->setMinorTickCount(2);//4
       mChart->addAxis(axisX,Qt::AlignLeft ); //坐标轴添加到图表，并指定方向
       lineSeries->attachAxis(axisX); //序列 series0 附加坐标轴
 
 
       QValueAxis *axisY = new QValueAxis;
       axisY->setRange( 0,  100);
       axisY->setTickCount(10);
       axisY->setMinorTickCount(2);//4
       mChart->addAxis(axisY,Qt::AlignBottom);
       lineSeries->attachAxis(axisY);
 
       mChart->setTheme(QChart::ChartThemeDark);
       lineSeries->setColor(Qt::red);
 
       mChart->setTitle("qrand");
 
       chartView->setChart(mChart);
 
       chartView->resize(QSize(500,300));
 
       chartView->setRenderHints(QPainter::Antialiasing); 
       ui->horizontalLayout->addWidget(chartView);     
}

//更新系列中的数据  注意：不需要将该系列从图表中移除
    lineSeries->clear();
    QList<QPointF> list;
    int count = cloud.points.size();
    std::cout << "new point s count : " << count << "  " << std::endl;
 
 
    for (int i = 0; i < count; i+=10)
    {
        list << QPointF(cloud.points[i].z, cloud.points[i].y);
    }
    lineSeries->replace(list);

    //------------------------------排序----------------------------
    std::sort(cloud.begin(), cloud.end(),
        [](pcl::PointXYZ a, pcl::PointXYZ b) {return a.z < b.z; });