QCharts下的动态曲线

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QDebug> #include <QKeyEvent> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow), m_chart(new QChart), TempTime(new QTimer), isStopping(false), currentChangel(0) { ui->setupUi(this); TempInferfaceInit(); TempTime->setInterval(50); TempTime->start(); tip = 0; connect(TempTime, SIGNAL(timeout()), this, SLOT(updateData())); connect(ui->Btn_Stop, SIGNAL(clicked(bool)), this, SLOT(Btn_Stop())); } MainWindow::~MainWindow() { delete ui; } void MainWindow::wheelEvent(QWheelEvent *event) { if (event->delta() > 0) { m_chart->zoom(1.1); } else { m_chart->zoom(10.0/11); } isZooninOrOut = true; QWidget::wheelEvent(event); } void MainWindow::TempInferfaceInit() { qint8 i; // m_chart->createDefaultAxes(); axisX = new QValueAxis; axisY = new QValueAxis; axisY->setRange(0, 120); axisX->setRange(0, 100); axisY->setTickCount(12 + 1); axisX->setTickCount(10 + 1); axisY->setLabelFormat("%.2f"); axisX->setLabelFormat("%d"); axisX->setTitleFont(QFont("Microsoft YaHei", 10, QFont::Normal, true)); axisY->setTitleFont(QFont("Microsoft YaHei", 10, QFont::Normal, true)); // axisX->setTitleText("Time/sec"); axisY->setTitleText("Temp/°C"); axisX->setGridLineVisible(false); axisY->setGridLineVisible(false); for(i = 0;i < 8;i++) { SeriesInit(i); } m_chart->legend()->hide(); m_chart->setTitle("Temp demo"); chartView = new ChartView(m_chart); chartView->setRenderHint(QPainter::Antialiasing); ui->verticalLayout->addWidget(chartView); } void MainWindow::SeriesInit(qint8 ch) { m_series[ch] = new QLineSeries; m_chart->addSeries(m_series[ch]); switch(ch) { case 0:m_series[ch]->setPen(QPen(Qt::black,2,Qt::SolidLine));break; case 1:m_series[ch]->setPen(QPen(Qt::red,2,Qt::SolidLine));break; case 2:m_series[ch]->setPen(QPen(Qt::green,2,Qt::SolidLine));break; case 3:m_series[ch]->setPen(QPen(Qt::blue,2,Qt::SolidLine));break; case 4:m_series[ch]->setPen(QPen(Qt::cyan,2,Qt::SolidLine));break; case 5:m_series[ch]->setPen(QPen(Qt::magenta,2,Qt::SolidLine));break; case 6:m_series[ch]->setPen(QPen(Qt::yellow,2,Qt::SolidLine));break; case 7:m_series[ch]->setPen(QPen(Qt::gray,2,Qt::SolidLine));break; } m_chart->setAxisX(axisX,m_series[ch]); m_chart->setAxisY(axisY,m_series[ch]); connect(m_series[ch], SIGNAL(hovered(QPointF, bool)), this, SLOT(showPointData(QPointF,bool))); } void MainWindow::updateData() { int i,j; QVector<QPointF> oldData[8]; QVector<QPointF> data[8]; qint64 size[8]; if(isVisible()) { if(currentChangel == 8) { for(j = 0;j < 8;j++) { oldData[j] = m_series[j]->pointsVector(); if (oldData[j].size() < 100) { data[j] = oldData[j]; } else { /* 添加之前老的数据到新的vector中，不复制最前的数据，即每次替换前面的数据 * 由于这里每次只添加1个数据，所以为1，使用时根据实际情况修改 */ for (i = 1; i < oldData[j].size(); ++i) { data[j].append(QPointF(i - 1, oldData[j].at(i).y())); } } size[j] = data[j].size(); } /* 这里表示插入新的数据，因为每次只插入1个，这里为i < 1, * 但为了后面方便插入多个数据，先这样写 */ for(i = 0; i < 1; ++i){ for(j = 0;j < 8;j++) { data[j].append(QPointF(i + size[j], GetTempData(j) )); } } for(j = 0;j < 8;j++) { m_series[j]->replace(data[j]); } } else { lastChangel =currentChangel; oldData[currentChangel] = m_series[currentChangel]->pointsVector(); if (oldData[currentChangel].size() < 100) { data[currentChangel] = oldData[currentChangel]; } else { for (i = 1; i < oldData[currentChangel].size(); ++i) { data[currentChangel].append(QPointF(i - 1, oldData[currentChangel].at(i).y())); } } size[currentChangel] = data[currentChangel].size(); for(i = 0; i < 1; ++i) { data[currentChangel].append(QPointF(i + size[currentChangel], GetTempData(currentChangel) )); } m_series[currentChangel]->replace(data[currentChangel]); } } } void MainWindow::Btn_Stop() { if (QObject::sender() == ui->Btn_Stop) { if (!isStopping) { TempTime->stop(); ui->Btn_Stop->setText("继续"); } else { TempTime->start(); ui->Btn_Stop->setText("暂停"); } isStopping = !isStopping; } } void MainWindow::showPointData(QPointF position, bool isHovering) { if (tip == 0) tip = new Callout(m_chart); if (isHovering) { if(currentChangel != 8) { tip->setText(QString("ch: %1 \nY: %2 ").arg(currentChangel+1).arg(QString::number(position.y(),'f',2))); } else { tip->setText(QString("Temp: %1 ").arg(QString::number(position.y(),'f',2))); } tip->setAnchor(position); tip->setZValue(11); tip->updateGeometry(); tip->show(); } else { tip->hide(); } } float MainWindow::GetTempData(qint8 ch) { ch++; switch(ch) { case 1:return 10;break; case 2:return 20;break; case 3:return 30;break; case 4:return 40;break; case 5:return 50;break; case 6:return 60;break; case 7:return 70;break; case 8:return 80;break; } return qrand() % 100; } void MainWindow::on_comboBox_currentIndexChanged(int index) { currentChangel = index; if(currentChangel != lastChangel) { TempTime->stop(); if(lastChangel == 8) { for(qint8 i = 0;i < 8;i++) { m_chart->removeSeries(m_series[i]); SeriesInit(i); } } else { m_chart->removeSeries(m_series[lastChangel]); SeriesInit(lastChangel); } m_chart->legend()->update(); lastChangel = currentChangel; TempTime->start(); } else { qDebug() << "I can`t believe"; } }