基于qt5.14.2版本Qchart绘制图表

#include "EVChartView.h" #include <QtDebug> EVChartView::EVChartView():MyChart(nullptr), x_line(nullptr), y_line(nullptr) { resize(width(),height()); setRenderHints(QPainter::Antialiasing );//设置抗锯齿| QPainter::SmoothPixmapTransform // Mychartview->setAttribute(Qt::WA_TransparentForMouseEvents, true); //设置控件不接受鼠标事件 // setMouseTracking(true); init(); } EVChartView::~EVChartView() { } void EVChartView::repaceData(QVector<QPointF> &Pointf) { if(Pointf.size()) { MyPointf = Pointf; MyLineSeries.replace(Pointf); if(MyLineSeries.attachedAxes().size() == 0) { MyLineSeries.attachAxis(&MyAxisX); MyLineSeries.attachAxis(&MyAxisY); } } } void EVChartView::clearData() { MyLineSeries.clear(); } void EVChartView::setAxisX(double xmin, double xmax) { MyAxisX.setMin(xmin); MyAxisX.setMax(xmax); } void EVChartView::setAxisY(double ymin, double ymax) { MyAxisY.setMin(ymin); MyAxisY.setMax(ymax); } QString htmldata; void EVChartView::mouseMoveEvent(QMouseEvent *e) { // qDebug()<< this->chart()->mapToValue(e->pos());//把鼠标坐标值转化为画出的图中的坐标 //以防父类的实例接收不到mouseMoveEvent事件。 // QChartView::mouseMoveEvent(e);//调用父类的重写方法。本行程序不同于e->ignore()，ignor是把事件继续向父控件（一般其父控件就是ui界面）传递，而不是向父类传递 int nX = this->chart()->mapToValue(e->pos()).x(); int nY = this->chart()->mapToValue(e->pos()).y(); if(MyAxisX.max()>= nX && MyAxisX.min() <= nX && MyAxisY.min() <= nY && MyAxisY.max()>= nY) { x_line->setLine(e->x(),0,e->x(),this->height()); y_line->setLine(0,e->y(),this->width(),e->y()); htmldata = QString("当前坐标位置 [%1,%2]").arg(nX).arg(nY); currentPointText->setHtml(htmldata); currentPointText->setX(e->x()+15); currentPointText->setY(e->y()); x_line->setVisible(true); y_line->setVisible(true); currentPointText->setVisible(true); }else{ x_line->setVisible(false); y_line->setVisible(false); currentPointText->setVisible(false); } } //void EVChartView::enterEvent(QEvent *event) //{ // x_line->setVisible(true); // y_line->setVisible(true); // currentPointText->setVisible(true); //} void EVChartView::leaveEvent(QEvent *event) { x_line->setVisible(false); y_line->setVisible(false); currentPointText->setVisible(false); } void EVChartView::init() { //设置图表样式 MyChart = new QChart(); MyChart->setBackgroundBrush(QColor("#243B59")); //设置背景颜色 // MyChart->legend()->setColor(QColor("#ffffff")); // MyChart->legend()->setAlignment(Qt::AlignLeft); // MyChart->legend()->setLabelColor("#ffffff"); MyChart->legend()->setVisible(false); QFont font("微软雅黑"); font.setBold(true); font.setPointSize(10); MyChart->legend()->setFont(font); MyAxisX.setLabelsColor(QColor("#ffffff")); MyAxisX.setGridLineColor(QColor("#45658D")); MyAxisX.setLineVisible(false); MyAxisX.setLabelsFont(font); MyAxisX.setTickCount(5); MyAxisY.setLabelsColor(QColor("#ffffff")); MyAxisY.setGridLineColor(QColor("#45658D")); MyAxisY.setLineVisible(false); MyAxisY.setLabelsFont(font); MyAxisY.setTickCount(5); MyAxisX.setMin(0); MyAxisX.setMax(50); MyAxisY.setMin(0); MyAxisY.setMax(50); MyChart->addAxis(&MyAxisY,Qt::AlignLeft); MyChart->addAxis(&MyAxisX,Qt::AlignBottom); // MyLineSeries.setName("Voltage.V"); MyLineSeries.setColor(QColor("#36D2FF")); // MyLineSeries.setUseOpenGL(true); MyChart->addSeries(&MyLineSeries); setChart(MyChart); //添加线条 y_line = new QGraphicsLineItem(); // 定义一个直线图元 x_line = new QGraphicsLineItem(); y_line->setLine(QLineF(10, 0, 10,height())); y_line->setPen(QPen(QColor("#36D2FF"))); y_line->setEnabled(false); y_line->setVisible(false); x_line->setLine(QLineF(10, 0, 10,height())); x_line->setPen(QPen(QColor("#36D2FF"))); x_line->setEnabled(false); x_line->setVisible(false); scene()->addItem(x_line); scene()->addItem(y_line); currentPointText=new QGraphicsTextItem(); currentPointText->setDefaultTextColor(QColor("#ffffff")); currentPointText->setHtml("大家好"); currentPointText->setEnabled(false); currentPointText->setVisible(false); scene()->addItem(currentPointText); }