Qt Qwt 绘制动态曲线

#include "qwt_test.h" #include "ui_qwt_test.h" #include <qwt_plot.h> #include <qwt_plot_curve.h> #include <time.h> #include "timescaledraw.h" #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> QTime m_baseTime =QTime::currentTime(); //QDateTime::currentDateTime(); int i; //bool ok; //QTime TimeArr[6]; //double tim[20] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,17,19,20,22,24}; //double tim[6] = {0,20,40,60,80,100}; //double val[12] = {3, 5, 8, 7, 2, 0, 7, 9, 1}; //double val[6] = {}; //double Data[6]; float Qri = 0.0; float Des = 20.0; Qwt_test::Qwt_test(QWidget *parent) : QWidget(parent), ui(new Ui::Qwt_test) { ui->setupUi(this); //QwtPlotCurve * curve; tim = 0.0; //设置坐标轴的名称 //ui->qwtPlot.setAxisTitle(QwtPlot::xBottom, "x->"); //ui->qwtPlot->setAxisTitle(QwtPlot::yLeft, "y->"); //ui->qwtPlot->setAxisTitle(20,"x->"); time_t timep; time (&timep); QString DataString = asctime(gmtime(&timep)); QString DataString2 = ctime(&timep); ui->lineEdit->setText(DataString); ui->lineEdit_2->setText(DataString2); int StringSize; StringSize = DataString2.size(); ui->lineEdit_8->setText(QString::number(StringSize)); QString s1 = DataString2.left(3); ui->lineEdit_3->setText(s1); QString s2 = DataString2.mid(4,3); ui->lineEdit_4->setText(s2); QString s3 = DataString2.mid(7,3); ui->lineEdit_5->setText(s3); QString s4 = DataString2.mid(10,10); ui->lineEdit_6->setText(s4); QString s5 = DataString2.mid(20,4); ui->lineEdit_7->setText(s5); // for(int i = 0;i < 20;i++) // { // double data = s4.toDouble(&ok); // if(ok) // { // tim[i] = data; // } // } ui->qwtPlot->setAxisTitle(QwtPlot::xBottom, " System Uptime [h:m:s]"); curve = new QwtPlotCurve("Acc_X"); QPen pen(Qt::red,3); curve->setPen(pen); //-Wl,-rpath,/usr/local/qwt-5.2.1/lib //ui->qwtPlot->setAxisScaleDraw(QwtPlot::xBottom, new TimeScaleDraw()); //qwtplot->setAxisScaleDraw(QwtPlot::xBottom, new TimeScaleDraw(0, 20)); //qwtplot->setAxisScaleDraw(QwtPlot::xBottom, new TimeScaleDraw()); ui->qwtPlot->setAxisScaleDraw(QwtPlot::xBottom,new TimeScaleDraw(m_baseTime)); ui->qwtPlot->setAxisScale(QwtPlot::yLeft,0.0,10.0); ui->qwtPlot->setAxisScale(QwtPlot::xBottom,Qri,Des); // ui->qwtPlot->setAxisScaleDraw( QwtPlot::xBottom, // new TimeScaleDraw( cpuStat.upTime() ) ); //curve->setRawData(tim, val,i); curve->attach(ui->qwtPlot); //ui->qwtPlot->replot(); this->startTimer(1000); //printf(“%s”,asctime(gmtime(&timep))); } Qwt_test::~Qwt_test() { delete ui; } void Qwt_test::timerEvent( QTimerEvent * ) { // if(i<20) // { // val[i]=qrand()%10; // curve->setRawData(tim, val,i); // i++; // } // else // { // for (int i = 0; i < 20; i++) // { // val[i] = val[i+1]; // } // val[19] = qrand()%10; // curve->setData(tim, val,20); // } //m_baseTime =QTime::currentTime(); if(i<20) { //TimeArr[i] = QTime::currentTime(); //double data[i] = (new TimeScaleDraw(TimeArr[i])); //double //val[i]=qrand()%10; //ui->qwtPlot->setAxisScaleDraw(QwtPlot::xBottom,new TimeScaleDraw(TimeArr[i])); //curve->setRawData(tim, val,i+1); yData.append(qrand()%10); xData.append(tim); tim += 1;//per one seconds one data //m_baseTime =QTime::currentTime(); //ui->qwtPlot->setAxisScaleDraw(QwtPlot::xBottom,new TimeScaleDraw(m_baseTime)); curve->setData(xData,yData); i++; } else { // for (int i = 0; i < 9; i++) // { // val[i] = val[i+1]; // TimeArr[i]=TimeArr[i+1]; // } // val[5] = qrand()%10; // TimeArr[5]=QTime::currentTime(); // tim[6] = tim[6]+5; // //TimeArr[i] = QTime::currentTime(); // //ui->qwtPlot->setAxisScale(QwtPlot::xBottom,new TimeScaleDraw(TimeArr[0]),new TimeScaleDraw(TimeArr[5])); // //ui->qwtPlot->setAxisScaleDraw(QwtPlot::xBottom,new TimeScaleDraw(TimeArr[i])); // //curve->SetAxisScaleDraw(TimeArr); // curve->setData(tim, val,6); // //curve->setData(); m_baseTime =QTime::currentTime(); ui->qwtPlot->setAxisScaleDraw(QwtPlot::xBottom,new TimeScaleDraw(m_baseTime)); yData.remove(0); yData.append(qrand()%10); curve->setData(xData,yData); } //所有数据前移移位，首位被覆盖 //最后一位为新数据（这里为随机数模拟） //重新加载数据 //curve->setSamples(time, val, 10); QPen pen(Qt::red,3); curve->setPen(pen); //QwtPlot重绘，重要，没有这句不起作用 ui->qwtPlot->replot(); }