Qt-Charts动态显示多条折线电压值(实现示波器效果).rar

#include <QDebug> #include "ChartsView.h" #include <QtGui/QResizeEvent> #include <QtWidgets/QGraphicsScene> #include <QtCharts/QChart> #include <QtCharts/QLineSeries> #include <QtCharts/QSplineSeries> #include <QtWidgets/QGraphicsTextItem> #include <QtGui/QMouseEvent> #include <QValueAxis> #define X_Width 5 //宽度5S ChartsView::ChartsView(int YRange, QWidget *parent) : QGraphicsView(new QGraphicsScene, parent), m_coordX(0), m_coordY(0), m_chart(0) { setDragMode(QGraphicsView::NoDrag); setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); m_chart = new QChart; initLineSeries( YRange); m_chart->setAcceptHoverEvents(true); setRenderHint(QPainter::Antialiasing); scene()->addItem(m_chart); m_coordX = new QGraphicsSimpleTextItem(m_chart); m_coordX->setPos(m_chart->size().width()/2 + 100, m_chart->size().height()); m_coordX->setText(""); m_coordX->setPen(QColor(20,164,226)); m_coordY = new QGraphicsSimpleTextItem(m_chart); m_coordY->setPos(m_chart->size().width()/2 - 50, m_chart->size().height()); m_coordY->setText(""); m_coordY->setPen(QColor(226,20,216)); this->setMouseTracking(true); MSecBase = QDateTime::currentDateTime().toMSecsSinceEpoch(); } void ChartsView::initLineSeries(int YRange) { QColor colors[3] = {QColor(20,164,226),QColor(36,20,226),QColor(226,20,216)}; //创建X轴和Y轴 axisX = new QValueAxis; axisX->setLabelFormat("%ds"); axisX->setTickCount(X_Width); //定义X有多少个表格 axisX->setRange(0,X_Width); axisY = new QValueAxis; axisY->setRange(-YRange,YRange); axisY->setTitleText("纹波值"); axisY->setTickCount(9); //定义Y有多少个表格 for(int i =0; i<3;i++) { series[i].setColor(colors[i]); series[i].setName(QString("测值%1").arg(i)); series[i].setVisible(true); m_chart->addSeries(&series[i]); m_chart->setAxisX(axisX,&series[i]); m_chart->setAxisY(axisY,&series[i]); m_Line[i] = new QGraphicsSimpleTextItem(m_chart); m_Line[i]->setPos(34+i*40, m_chart->size().height()- 20); m_Line[i]->setText(QString("测值%1").arg(i)); m_Line[i]->setPen(colors[i]); } //设置底部 m_chart->legend()->setVisible(false); } void ChartsView::initMSecBase(int YRange) //初始化MSecBase,以MSecBase为开头 { axisX->setMin(0); axisX->setMax(X_Width); axisY->setMin(-YRange); axisY->setMax(YRange); for(int i=0;i<3;i++) { series[i].clear(); series[i].clear(); series[i].append(QPointF(0,0)); } MSecBase = QDateTime::currentDateTime().toMSecsSinceEpoch(); } void ChartsView::clearMSecBase() { MSecBase = QDateTime::currentDateTime().toMSecsSinceEpoch(); } void ChartsView::setShowLine(int flag) //0~2:显示某个曲线 否则的话显示所有曲线 { for(int i=0;i<3;i++) { if(flag>=0&&flag<=2) { if(flag==i) series[i].show(); else series[i].hide(); } else series[i].show(); } } void ChartsView::addLineSeries(int i,float value) { float currentS =(QDateTime::currentDateTime().toMSecsSinceEpoch() - MSecBase)/1000.0; //1s=1000MS if(i>=3) return; if(currentS>=axisX->max()) { axisX->setMin(currentS-X_Width); axisX->setMax(currentS); } if(value>=qMax(qAbs(axisY->max()),qAbs(axisY->min()))) { axisY->setMin(-value*1.1); axisY->setMax(value*1.1); } //定时清除以前不要的曲线数据 if(series[i].count()>600) { series[i].removePoints(0,series[i].count()/2); } series[i].append(QPointF(currentS,value)); } void ChartsView::addLineSeries(int i,float s,float value) { if(s>=axisX->max()) { axisX->setMin(s-X_Width); axisX->setMax(s); } if(value>=qMax(qAbs(axisY->max()),qAbs(axisY->min()))) { axisY->setMin(-value*1.1); axisY->setMax(value*1.1); } series[i].append(QPointF(s,value)) ; } void ChartsView::resizeEvent(QResizeEvent *event) { if (scene()) { scene()->setSceneRect(QRect(QPoint(0, 0), event->size())); m_chart->resize(event->size()); m_coordX->setPos(m_chart->size().width()/2 + 100, m_chart->size().height() - 20); m_coordY->setPos(m_chart->size().width()/2 - 50, m_chart->size().height() - 20); for(int i=0;i<3;i++) { m_Line[i]->setPos(34+i*40, m_chart->size().height()- 20); m_Line[i]->setText(QString("测值%1").arg(i)); } } QGraphicsView::resizeEvent(event); } void ChartsView::mouseMoveEvent(QMouseEvent *event) { m_coordX->setText(QString("值:%1mV").arg(QString::asprintf("%.2f",m_chart->mapToValue(event->pos()).y()))); m_coordY->setText(QString("时间:%1S").arg(QString::asprintf("%.2f",m_chart->mapToValue(event->pos()).x()))); emit mouseMoveisChange(QPointF(m_chart->mapToValue(event->pos()).x(),m_chart->mapToValue(event->pos()).y())); QGraphicsView::mouseMoveEvent(event); }