Qwt自定义平移操作类QwtPlotPanner

#include "MyWidget.h" #include "ui_MyWidget.h" #include "MPlotPanner.h" #include <qwt_legend.h> #include <qwt_plot_panner.h> #include <qwt_plot_magnifier.h> #include <qwt_symbol.h> #include <qwt_plot_zoomer.h> #include <qwt_scale_draw.h> #include <qwt_scale_widget.h> #include <QTime> #include <QTimer> #include <QDebug> #define SHOW_SECONDS 5 class MyTimeScaleDraw : public QwtScaleDraw { public: MyTimeScaleDraw() { } virtual QwtText label(double v) const { QDateTime dt; dt.setTime_t((int)v); return dt.toString("yyyy-MM-dd\n hh:mm:ss"); } private: QDateTime baseTime; }; MyWidget::MyWidget(QWidget *parent) : QMainWindow(parent), ui(new Ui::MyWidget) { ui->setupUi(this); init(); } MyWidget::~MyWidget() { delete ui; } void MyWidget::init() { //设置标题 ui->qwtPlot->setTitle(QStringLiteral("按秒采集数据波形图")); //设置画图板的大小 ui->qwtPlot->resize(500, 300); //设置plot的背景 ui->qwtPlot->setCanvasBackground(Qt::green); //设置坐标轴的名称 ui->qwtPlot->setAxisTitle(QwtPlot::xBottom, " System Uptime[yyyy-MM-dd\n hh:mm:ss]"); ui->qwtPlot->setAxisTitle(QwtPlot::yLeft, "V"); ui->qwtPlot->setAxisScaleDraw(QwtPlot::xBottom, new MyTimeScaleDraw()); //设置坐标轴的范围 m_xMaxScale = QDateTime::currentDateTime().toTime_t(); ui->qwtPlot->setAxisScale(QwtPlot::xBottom, m_xMaxScale - 10, m_xMaxScale); ui->qwtPlot->setAxisLabelAlignment(QwtPlot::xBottom, Qt::AlignHCenter | Qt::AlignBottom); ui->qwtPlot->setAxisScale(QwtPlot::yLeft, 0, 255); //设置右边标注(示例图示) ui->qwtPlot->insertLegend(new QwtLegend(), QwtPlot::RightLegend); QwtScaleWidget *scaleWidget = ui->qwtPlot->axisWidget(QwtPlot::xBottom);//设置坐标边距 const int fmh = QFontMetrics(scaleWidget->font()).height(); scaleWidget->setMinBorderDist(0, fmh / 2); m_pMagnifier = new QwtPlotMagnifier(ui->qwtPlot->canvas()); //使用滚轮放大/缩小 m_pMagnifier->setAxisEnabled(QwtPlot::yLeft, false); m_pPanner = new MPlotPanner(ui->qwtPlot->canvas()); //使用鼠标左键平移 m_pPanner->setAxisEnabled(QwtPlot::yLeft, false); m_pPOCurve = new QwtPlotCurve(QStringLiteral("AD模拟采集")); //线名 // xs.append(0); // ys.append(0); // m_pPOCurve->setSamples(xs,ys); //设置数据 m_pPOCurve->setStyle(QwtPlotCurve::Lines); //直线形式 m_pPOCurve->setCurveAttribute(QwtPlotCurve::Fitted, true); //让曲线更光滑 m_pPOCurve->setPen(QPen(Qt::red)); //设置画笔 //把曲线附加到plot m_pPOCurve->attach(ui->qwtPlot); //启动定时器，1秒响应，用于模拟产生实时数据 randPlotTimer = new QTimer(); connect(randPlotTimer, SIGNAL(timeout()), SLOT(realTimePlot())); AddSample(10); } void MyWidget::AddSample(const unsigned uDrawLength) { double dx = m_xMaxScale - uDrawLength; xs.clear(); ys.clear(); for (qint64 i = 0; i < uDrawLength; i++) { xs.append(dx + i); ys.append(rand() % 250); } m_pPOCurve->setSamples(xs, ys); m_pPanner->setAxisRange(QwtPlot::xBottom, xs.first(), xs.last()); } void MyWidget::on_btnStart_clicked() { if ("stop" == ui->btnStart->text()) { randPlotTimer->stop(); ui->btnStart->setText("start"); } else { randPlotTimer->start(40); ui->btnStart->setText("stop"); } } void MyWidget::realTimePlot() { ui->qwtPlot->setAxisScale(QwtPlot::xBottom, QDateTime::currentDateTime().toTime_t() - 5, m_xMaxScale = QDateTime::currentDateTime().toTime_t()); //qDebug()<<QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss")+"sec"; points << QPointF(QDateTime::currentDateTime().toTime_t(), rand() % 255); m_pPOCurve->setSamples(points); m_pPOCurve->attach(ui->qwtPlot); ui->qwtPlot->replot(); }