qt介绍图表 charts 一

qt chartsj基于Q的Graphics View框架，其核心组件是QChartView和QChart.QChartView是一个显示图表的独立部件，基类为QGraphicsView.QChar类管理图表的序列，图例和轴示意图。

绘制一个cos和sin曲线图，效果如下

实现代码

#include "widget.h"
#include "ui_widget.h"
#include <QtCharts>
Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);QChartView *chartView=new QChartView(this);QChart *chart=new QChart();chart->setTitle("简单函数曲线");chartView->setChart(chart);//序列QLineSeries *series0=new QLineSeries();QLineSeries *series1=new QLineSeries();series0->setName("sin曲线");series1->setName("cos曲线");chart->addSeries(series0);chart->addSeries(series1);//Qpenqreal x=0,intv=0.1;for(int i=0;i<100;i++){series0->append(x,qSin(x));series1->append(x,qCos(x));x+=intv;}//轴QValueAxis *axisX=new QValueAxis();axisX->setRange(0,10);axisX->setTitleText("时间(秒)");QValueAxis *axisY=new QValueAxis();axisY->setRange(-2,2);axisY->setTitleText("值");chart->addAxis(axisX,Qt::AlignBottom);chart->addAxis(axisY,Qt::AlignLeft);series0->attachAxis(axisX);series0->attachAxis(axisY);series1->attachAxis(axisX);series1->attachAxis(axisY);chartView->setAlignment(Qt::AlignCenter);QVBoxLayout *layout=new QVBoxLayout(this);layout->addWidget(chartView);this->setLayout(layout);}Widget::~Widget()
{delete ui;
}