ui界面

核心代码

void Dialog::slot_timer()
{qreal xOffset=0.f;//x的偏移量,推进的距离qreal dIncrease=10;//增加量//数据for(int i=0;i<10;i++){m_x+=dIncrease;xOffset+=dIncrease;m_splineSerise->append(m_x,qrand()%10);//根据实际情况删除多余数据}//删除多余数据if(m_splineSerise->count()>c_MaxSize){m_splineSerise->removePoints(0,m_splineSerise->count()*0.5-c_MaxSize);//删除多余数据}//计算x周每个单位的宽度qreal xUnit =m_chart->plotArea().width()/(m_axisX->max()-m_axisX->min());qreal xScroll =xOffset*xUnit;m_chart->scroll(xScroll,0);//对x轴进行滚动}

全部代码

#include "dialog.h"
#include "ui_dialog.h"const quint32 c_MaxSize=1000;//数据个数Dialog::Dialog(QWidget *parent):QDialog(parent),ui(new Ui::Dialog),m_x(0.f),m_splineSerise(NULL)
{ui->setupUi(this);//构建曲线系列m_splineSerise=new QSplineSeries(this);//为折线图添加初始数据：第一个位置决定了心电图的曲线终点位置m_x=1000;m_splineSerise->append(m_x,1);//构建图标对象m_chart=new QChart();//注意：先添加到图表再创建坐标轴,否则无效//1.将折线系列添加到图表m_chart->addSeries(m_splineSerise);//构建坐标轴m_axisX = new QValueAxis();m_axisX->setRange(0,c_MaxSize);m_axisX->setTitleText(QStringLiteral("X"));//设置标题m_axisX->setLabelFormat("%g");//设置格式m_axisX->setTickCount(5);//设置刻度数m_axisY= new QValueAxis();m_axisY->setRange(-10,10);m_axisY->setTitleText(QStringLiteral("Y"));//将坐标轴绑定m_chart->setAxisX(m_axisX,m_splineSerise);m_chart->setAxisY(m_axisY,m_splineSerise);//隐藏图例m_chart->legend()->hide();//设置图标主题m_chart->setTheme(QtCharts::QChart::ChartThemeBlueCerulean);//设置标题m_chart->setTitle(QString("图表1"));//设置尺寸m_chart->setGeometry(0,0,500,300);//构建场景m_pScene =new QGraphicsScene(this);//为视图构建场景ui->graphicsView->setScene(m_pScene);//将图表添加到场景m_pScene->addItem(m_chart);//设置抗锯齿ui->graphicsView->setRenderHint(QPainter::Antialiasing,true);//构造定时器m_timer=new QTimer(this);m_timer->setInterval(100);//设置定时器间隔//绑定定时器connect(m_timer,&QTimer::timeout,this,&Dialog::slot_timer);m_timer->start();}Dialog::~Dialog()
{m_chart->removeAllSeries();delete ui;
}qreal Dialog::getData(qreal x)
{return qSin(x*2*M_PI)*7;
}void Dialog::slot_timer()
{qreal xOffset=0.f;//x的偏移量,推进的距离qreal dIncrease=10;//增加量//数据for(int i=0;i<10;i++){m_x+=dIncrease;xOffset+=dIncrease;m_splineSerise->append(m_x,qrand()%10);//根据实际情况删除多余数据}//删除多余数据if(m_splineSerise->count()>c_MaxSize){m_splineSerise->removePoints(0,m_splineSerise->count()*0.5-c_MaxSize);//删除多余数据}//计算x周每个单位的宽度qreal xUnit =m_chart->plotArea().width()/(m_axisX->max()-m_axisX->min());qreal xScroll =xOffset*xUnit;m_chart->scroll(xScroll,0);//对x轴进行滚动}