QT QChart绘制折线图应用程序示例

#include "mainwindow.h" #include "ui_mainwindow.h" #include "qwdialogpen.h" // 若MSVC 编译版本错误，修改 msvc-version.conf 文件 // 解决MSVC编译时，界面汉字乱码的问题 #if _MSC_VER >= 1600 //MSVC2015>1899, MSVC_VER= 14.0 #pragma execution_character_set("utf-8") #endif void MainWindow::createChart() {//创建图表的各个部件 QChart *chart = new QChart(); chart->setTitle(tr("简单函数曲线")); // chart->setAcceptHoverEvents(true); ui->chartView->setChart(chart); ui->chartView->setRenderHint(QPainter::Antialiasing); QLineSeries *series0 = new QLineSeries(); QLineSeries *series1 = new QLineSeries(); series0->setName("Sin曲线"); series1->setName("Cos曲线"); curSeries=series0; //当前序列 QPen pen; pen.setStyle(Qt::DotLine);//Qt::SolidLine, Qt::DashLine, Qt::DotLine, Qt::DashDotLine pen.setWidth(2); pen.setColor(Qt::red); series0->setPen(pen); //折线序列的线条设置 pen.setStyle(Qt::SolidLine);//Qt::SolidLine, Qt::DashLine, Qt::DotLine, Qt::DashDotLine pen.setColor(Qt::blue); series1->setPen(pen);//折线序列的线条设置 chart->addSeries(series0); chart->addSeries(series1); QValueAxis *axisX = new QValueAxis; curAxis=axisX; //当前坐标轴 axisX->setRange(0, 10); //设置坐标轴范围 axisX->setLabelFormat("%.1f"); //标签格式 axisX->setTickCount(11); //主分隔个数 axisX->setMinorTickCount(4); axisX->setTitleText("time(secs)"); //标题 // axisX->setGridLineVisible(false); QValueAxis *axisY = new QValueAxis; axisY->setRange(-2, 2); axisY->setTitleText("value"); axisY->setTickCount(5); axisY->setLabelFormat("%.2f"); //标签格式 // axisY->setGridLineVisible(false); axisY->setMinorTickCount(4); chart->setAxisX(axisX, series0); //添加X坐标轴 chart->setAxisX(axisX, series1); //添加X坐标轴 chart->setAxisY(axisY, series0); //添加Y坐标轴 chart->setAxisY(axisY, series1); //添加Y坐标轴 //另一种实现设置坐标轴的方法 // chart->addAxis(axisX,Qt::AlignBottom); //坐标轴添加到图表，并指定方向 // chart->addAxis(axisY,Qt::AlignLeft); // series0->attachAxis(axisX); //序列 series0 附加坐标轴 // series0->attachAxis(axisY); // series1->attachAxis(axisX);//序列 series1 附加坐标轴 // series1->attachAxis(axisY); foreach (QLegendMarker* marker, chart->legend()->markers()) { QObject::disconnect(marker, SIGNAL(clicked()), this, SLOT(on_LegendMarkerClicked())); QObject::connect(marker, SIGNAL(clicked()), this, SLOT(on_LegendMarkerClicked())); } } void MainWindow::prepareData() {//为序列生成数据 QLineSeries *series0=(QLineSeries *)ui->chartView->chart()->series().at(0); QLineSeries *series1=(QLineSeries *)ui->chartView->chart()->series().at(1); series0->clear(); //清除数据 series1->clear(); qsrand(QTime::currentTime().second());//随机数初始化 qreal t=0,y1,y2,intv=0.1; qreal rd; int cnt=100; for(int i=0;i<cnt;i++) { rd=(qrand() % 10)-5; //随机数,-5~+5 y1=qSin(t)+rd/50; *series0<<QPointF(t,y1); //序列添加数据点 // series0->append(t,y1); //序列添加数据点 rd=(qrand() % 10)-5; //随机数,-5~+5 y2=qCos(t)+rd/50; // series1->append(t,y2); //序列添加数据点 *series1<<QPointF(t,y2); //序列添加数据点 t+=intv; } } void MainWindow::updateFromChart() { //从图表上获取数据更新界面显示 QChart *aChart; aChart=ui->chartView->chart(); //获取chart ui->editTitle->setText(aChart->title()); //图表标题 QMargins mg=aChart->margins(); //边距 ui->spinMarginLeft->setValue(mg.left()); ui->spinMarginRight->setValue(mg.right()); ui->spinMarginTop->setValue(mg.top()); ui->spinMarginBottom->setValue(mg.bottom()); } //void MainWindow::mouseMoveEvent(QMouseEvent *event) //{ //// QPointF point; //// point=ui->chartView->chart()->mapToValue(event->pos()); //// this->labXYValue->setText(QString::asprintf("X=%.2f,Y=%.2f", //// point.x(), point.y())); //// QChartView::mouseMoveEvent(event); //// m_coordX->setText(QString("X: %1").arg(m_chart->mapToValue(event->pos()).x())); //// m_coordY->setText(QString("Y: %1").arg(m_chart->mapToValue(event->pos()).y())); // // QGraphicsView::mouseMoveEvent(event); //} //bool MainWindow::eventFilter(QObject *watched, QEvent *event) //{ // if (watched==ui->chartView) // if (event->type()==QEvent::MouseMove) // { // QMouseEvent *msEvent; // msEvent=(QMouseEvent *)event; // QPointF point; // point=ui->chartView->chart()->mapToValue(msEvent->pos()); // this->labXYValue->setText(QString::asprintf("X=%.2f,Y=%.2f", // point.x(), point.y())); // return true; //// QChartView::mouseMoveEvent(event); // } // return QMainWindow::eventFilter(watched,event); //} MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); // labXYValue = new QLabel("X=, Y= "); // labXYValue->setMinimumWidth(200); // ui->statusBar->addWidget(labXYValue); createChart();//创建图表 prepareData();//生成数据 updateFromChart(); //从图表获得属性值，刷新界面显示 // ui->chartView->chart()->installEventFilter(this);//安装事件过滤器，由主窗口处理事件 // ui->chartView->setMouseTracking(true); // this->setMouseTracking(true); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_LegendMarkerClicked() { QLegendMarker* marker = qobject_cast<QLegendMarker*> (sender()); switch (marker->type()) { case QLegendMarker::LegendMarkerTypeXY: { marker->series()->setVisible(!marker->series()->isVisible()); marker->setVisible(true); qreal alpha = 1.0; if (!marker->series()->isVisible()) alpha = 0.5; QColor color; QBrush brush = marker->labelBrush(); color = brush.color(); color.setAlphaF(alpha); brush.setColor(color); marker->setLabelBrush(brush); brush = marker->brush(); color = brush.color(); color.setAlphaF(alpha); brush.setColor(color); marker->setBrush(brush); QPen pen = marker->pen(); color = pen.color(); color.setAlphaF(alpha); pen.setColor(color); marker->setPen(pen); break; } default: break; } } void MainWindow::on_actDraw_triggered() { //重新生成数据 prepareData();//重新生成数据 // ui->chartView->chart()->update();//更新绘图区 } void MainWindow::on_btnSetTitle_clicked() { //设置图标标题文字 QString str=ui->editTitle->text(); ui->chartView->chart()->setTitle(str); } void MainWindow::on_btnSetTitleFont_clicked() { //设置图标标题文字的字体 QFont font=ui->chartView->chart()->titleFont(); bool ok=false; font=QFontDialog::getFont(&ok,font); if (ok) ui->chartView->chart()->setTitleFont(font); } void MainWindow::on_btnSetMargin_clicked() {//设置图标的4个边距 QMargins mgs; mgs.setLeft(ui->spinMarginLeft->value()); mgs.setRight(ui->spinMarginRight->value()); mgs.setTop(ui->spinMarginTop->value()); mgs.setBottom(ui->spinMarginBottom->va