Qt QChart实现折线图的绘制

#ifndef MAINWINDOW_H #define MAINWINDOW_H #include  #include  #include  #include  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); /*为系列里添加100个数据*/ 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 list; int count = cloud.points.size(); std::cout << "new point s count : " << count << "  " << std::endl; for (int i = 0; i replace(list); 

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