7、QtCharts 获取数值曲线内容

#include "dialog.h" #include "ui_dialog.h" #include <QString> const quint32 c_MaxSize=1000;//数据个数 Dialog::Dialog(QWidget *parent) : QDialog(parent) , ui(new Ui::Dialog) ,m_splineSerise1(NULL) ,m_splineSerise2(NULL) { ui->setupUi(this); m_pChartView=new CChartView(ui->widget); QGridLayout* gridLayout=new QGridLayout(ui->widget); gridLayout->addWidget(m_pChartView,0,0); ui->widget->setLayout(gridLayout); //setWindowFlags(Qt::FramelessWindowHint); //构建各个系列的画笔 m_penSeries1 =QPen(Qt::green,2.f); m_penSeries2 =QPen(Qt::cyan,2.f); //构建曲线系列 m_splineSerise1=new QSplineSeries(this); m_splineSerise2=new QSplineSeries(this); //为折线添加数据,曲线一 qint32 i=0; qreal x=0.f; for (i=0;i<c_MaxSize;i++) { x=i*1.f/c_MaxSize; m_splineSerise1->append(i,getData_1(x)); } //为折线添加数据,曲线二 for ( i=0;i<c_MaxSize;i++) { x=i*1.f/c_MaxSize; m_splineSerise2->append(i,getData_2(x)); } //构建图标对象 m_chart=new QChart(); //注意：先添加到图表再创建坐标轴,否则无效 //构建坐标轴 m_axisX = new QValueAxis(); m_axisX->setRange(0,c_MaxSize); m_axisX->setTitleText(QString::fromLocal8Bit("Time"));//设置标题 m_axisX->setLabelFormat("%g");//设置格式 m_axisX->setTickCount(5);//设置刻度数 m_axisY= new QValueAxis(); m_axisY->setRange(-10,10); m_axisY->setTitleText(QString::fromLocal8Bit("T")); //将坐标轴绑定 m_chart->setAxisX(m_axisX,m_splineSerise1); m_chart->setAxisY(m_axisY,m_splineSerise1); m_chart->setAxisX(m_axisX,m_splineSerise2); m_chart->setAxisY(m_axisY,m_splineSerise2); // 隐藏图例 m_chart->legend()->hide(); // 设置图表的主题 m_chart->setTheme(QtCharts::QChart::ChartThemeBlueCerulean); // 为图表添加标题 m_chart->setTitle(QString::fromLocal8Bit("Polyline Chart")); // 将图表绑定到视图 m_pChartView->setChart(m_chart); /* 感兴趣的读者，可以封掉下面3行代码进行对比 */ m_chart->layout()->setContentsMargins(0, 0, 0, 0);//设置外边界全部为0 m_chart->setMargins(QMargins(0, 0, 0, 0));//设置内边界全部为0 m_chart->setBackgroundRoundness(0);//设置背景区域无圆角 // 设置反走样 m_pChartView->setRenderHint(QPainter::Antialiasing, true); m_pChartView->setBackgroundBrush(Qt::yellow); // 设置样式 changeStyle(); //1.将折线系列添加到图表 m_chart->addSeries(m_splineSerise1); m_chart->addSeries(m_splineSerise2); // 绑定鼠标悬浮信号 connect(m_splineSerise1, &QSplineSeries::hovered, this, &Dialog::slot_serieshovered1); connect(m_splineSerise2, &QSplineSeries::hovered, this, &Dialog::slot_serieshovered2); connect(m_splineSerise1, &QSplineSeries::hovered, m_pChartView, &CChartView::slot_showTip); connect(m_splineSerise2, &QSplineSeries::hovered, m_pChartView, &CChartView::slot_showTip); connect(m_splineSerise1, &QSplineSeries::clicked, m_pChartView, &CChartView::slot_keepTip); connect(m_splineSerise2, &QSplineSeries::clicked, m_pChartView, &CChartView::slot_keepTip); } Dialog::~Dialog() { delete ui; } void Dialog::slot_serieshovered1(const QPointF &point, bool state) { QPen penHighlight(Qt::white,5.f); if(state)//悬浮进入 { m_splineSerise1->setPen(penHighlight); } else { m_splineSerise1->setPen(m_penSeries1); } } void Dialog::slot_serieshovered2(const QPointF &point, bool state) { QPen penHighlight(Qt::white,5.f); if(state)//悬浮进入 { m_splineSerise2->setPen(penHighlight); } else { m_splineSerise2->setPen(m_penSeries2); } } qreal Dialog::getData_1(qreal x) { return qSin(x*2*M_PI)*7;//正弦 } qreal Dialog::getData_2(qreal x) { return qCos(x*2*M_PI)*7;//余弦 } void Dialog::changeStyle() { /** * 修改窗体 * */ //根据图表的主题设置调色板 setDialogPalette(); /** * 修改图表 * */ m_chart->setBackgroundVisible(true); //m_chart->setBackgroundBrush(Qt::transparent);//设置为透明 m_chart->setBackgroundBrush(Qt::lightGray); QPen penBackground; penBackground.setStyle(Qt::DotLine); penBackground.setColor(Qt::green); m_chart->setBackgroundPen(penBackground); /** * 修改绘图区 * */ m_chart->setPlotAreaBackgroundVisible(true); m_chart->setPlotAreaBackgroundBrush(Qt::gray); /** * 修改标题 * */ QFont fontTitle; fontTitle.setFamily(QString::fromLocal8Bit("华文琥珀")); fontTitle.setPointSizeF(20.f); m_chart->setTitleFont(fontTitle); //设置字色 m_chart->setTitleBrush(Qt::black); /** * 修改刻度 * */ //设置刻度 QFont fontAxis; fontAxis.setFamily(QString::fromLocal8Bit("微软雅黑")); fontAxis.setPointSizeF(12.f); m_axisX->setTitleFont(fontAxis); m_axisY->setTitleFont(fontAxis); //设置字色 m_axisX->setTitleBrush(Qt::darkMagenta); m_axisY->setTitleBrush(Qt::darkMagenta); //设否显示刻度线 m_axisX->setGridLineVisible(true); m_axisY->setGridLineVisible(true); //设置字体坐标轴 QFont fontLabel; fontLabel.setFamily(QStringLiteral("微软雅黑")); fontLabel.setPixelSize(12); m_axisX->setLabelsFont(fontLabel); m_axisY->setLabelsFont(fontLabel); /** * 修改图例 * */ //对齐方式 m_chart->legend()->setAlignment(Qt::AlignLeft); /** * 系列 * */ m_splineSerise1->setPen(m_penSeries1); QPen pn2(Qt::cyan,2.f); m_splineSerise2->setPen(m_penSeries2); /** * 开启动画 * */ QChart::AnimationOptions aniOptions=QChart::AllAnimations; //m_chart->setAnimationOptions(aniOptions); } void Dialog::setDialogPalette() { QChart::ChartTheme theme=QChart::ChartThemeBlueIcy; m_chart->setTheme(theme); //根据选定的主题确定Dialog的调色板 QPalette pal=window()->palette(); switch (theme) { case QtCharts::QChart::ChartThemeLight: pal.setColor(QPalette::Window, QRgb(0xf0f0f0)); pal.setColor(QPalette::WindowText, QRgb(0x404040)); break; case QtCharts::QChart::ChartThemeBlueCerulean: pal.setColor(QPalette::Window, QRgb(0xf0f0f0)); pal.setColor(QPalette::WindowText, QRgb(0x404040)); break; case QtCharts::QChart::ChartThemeDark: pal.setColor(QPalette::Window, QRgb(0x121218)); pal.setColor(QPalette::WindowText, QRgb(0xd6d6d6)); break; case QtCharts::QChart::ChartThemeBrownSand: pal.setColor(QPalette::Window, QRgb(0x9e8965)); pal.setColor(QPalette::WindowText, QRgb(0x404044)); break; case QtCharts::QChart::ChartThemeBlueNcs: pal.setColor(QPalette::Window, QRgb(0x18bba)); pal.setColor(QPalette::WindowText, QRgb(0x404044)); break; case QtCharts::QChart::ChartThemeHighContrast: pal.setColor(QPalette::Window, QRgb(0xffab03)); pal.setColor(QPalette::WindowText, QRgb(0x181818)); break; case QtCharts::QChart::ChartThemeBlueIcy: pal.setColor(QPalette::Window, QRgb(0xcee7f0)); pal.setColor(QPalette::WindowText, QRgb(0x404044)); break; case QtCharts::QChart::ChartThemeQt: default: pal.setColor(QPalette::Window, QRgb(0xf0f0f0)); pal.setColor(QPalette::WindowText, QRgb(0x404044));