c/c++语言开发共享Qt实现简单折线图表

#include <qapplication>  #include <qchartview>  #include <qlineseries>    #include <qdebug>    qvector<qpointf> convertline2step(const qvector<qpointf> &points)  {      qvector<qpointf> s;      s << points.at(0);      int x, y;      for (int i = 1; i < points.count(); i++)      {          x = points.at(i).x();          y = points.at(i - 1).y();          s << qpointf(x, y);          s << points.at(i);      }      return s;  }    int main(int argc, char *argv[])  {      qapplication a(argc, argv);      qtcharts::qchartview w;      w.setrenderhint(qpainter::antialiasing);      qtcharts::qchart chart;      chart.legend()->setvisible(true);      w.setchart(&chart);      qtcharts::qlineseries *series = new qtcharts::qlineseries;      qvector<qpointf> points;      points << qpointf(2, 4);      points << qpointf(3, 8);      points << qpointf(7, 4);      points << qpointf(10, 5);      points << qpointf(11, 1) << qpointf(13, 3) << qpointf(17, 6) << qpointf(18, 3)             << qpointf(20, 2);        *series << points.tolist();      series->setname("original");        qtcharts::qlineseries *stepserie = new qtcharts::qlineseries;      *stepserie << convertline2step(points).tolist();      stepserie->setname("step");      chart.addseries(series);      chart.addseries(stepserie);      chart.createdefaultaxes();      chart.settitle("simple line chart example");      w.show();      return a.exec();  }