#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QChartView>
#include <QChart>
#include <QLineSeries>
#include <QValueAxis>
 
QT_CHARTS_USE_NAMESPACE
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
 Q_OBJECT
 
public:
 explicit MainWindow(QWidget *parent = 0);
 ~MainWindow();
 
private:
 Ui::MainWindow *ui;
 QChart *chart;//非必要（QCharView實(shí)體中自帶一個QChart實(shí)體）
 QLineSeries *series_sin, *series_cos;
 QValueAxis *axis_x_sin, *axis_y_sin, *axis_x_cos, *axis_y_cos;
};
 
#endif // MAINWINDOW_H

MainWindow::MainWindow(QWidget *parent) :
 QMainWindow(parent),
 ui(new Ui::MainWindow),
 chart(new QChart),//或者不用new，直接指向ui->graphicsView->chart()也行
 series_sin(new QLineSeries),//sin曲線的數(shù)據(jù)點(diǎn)
 series_cos(new QLineSeries),//cos曲線的數(shù)據(jù)點(diǎn)
 axis_x_sin(new QValueAxis),//sin的X軸
 axis_y_sin(new QValueAxis),//sin的Y軸
 axis_x_cos(new QValueAxis),//cos的X軸
 axis_y_cos(new QValueAxis)//cos的Y軸
{
 ui->setupUi(this);
 ui->graphicsView->setChart(chart);//view中顯示出chart
 
 for(float x = 0; x < 10; x += 0.1)
 {
  series_sin->append(x, sin(x));
 }
 axis_x_sin->setRange(-5,25);
 axis_y_sin->setRange(-2,2);
 chart->addSeries(series_sin);
 /*功能是：添加軸，并把軸和數(shù)據(jù)系列連接。注意，這一行并不能用來給chart添加數(shù)據(jù)系列
  添加數(shù)據(jù)系列，要用chart->addSeries*/
 chart->setAxisX(axis_x_sin, series_sin);
 chart->setAxisY(axis_y_sin, series_sin);
 
 
 for(float x = 10; x < 20; x += 0.1)
 {
  series_cos->append(x, cos(x));
 }
 
 axis_x_cos->setRange(5,25);
 axis_y_cos->setRange(-2,2);
 chart->addSeries(series_cos);
 chart->setAxisX(axis_x_cos, series_cos);//cos使用自己的X軸
 chart->setAxisY(axis_y_cos, series_cos);
// chart->setAxisX(axis_x_sin, series_cos);//cos共享sin曲線的X軸
// chart->setAxisY(axis_y_sin, series_cos);
}