画动态曲线另一种方式方式
1.QChart
在pro文件中加入QT += charts
在.h文件中加入#include <QtCharts>
代码如下
.h文件
1 QChart *chart; 2 QChartView *chartView; 3 QLineSeries* _vol_series;
.cpp文件
1 void widget::initNumber() 2 { 3 4 //曲线类 5 _vol_series = new QLineSeries; 6 _vol_series->setPen(QPen(QColor(160, 217, 246), 4)); 7 //画笔 8 chart = new QChart(); 9 chart->legend()->hide(); // 隐藏图例 10 chart->setTitleBrush(Qt::white); 11 chart->setTitleFont(QFont("Montserrat", 22)); 12 chart->setBackgroundBrush(QColor(0, 200, 0, 0)); 13 //设置标题 14 chart->setTitle(QObject::tr("Voltage measurements from probe 1 to 2 during pulses 1 to 90")); 15 chart->addSeries(_vol_series); 16 //坐标轴 17 QValueAxis* vol_axisX = new QValueAxis; 18 //X轴 19 vol_axisX->setRange(0, 100); 20 vol_axisX->setVisible(false); 21 //设置是否显示网格线 22 vol_axisX->setGridLineVisible(false); 23 vol_axisX->setTitleText(QObject::tr("")); 24 chart->addAxis(vol_axisX, Qt::AlignBottom); 25 //Y轴 26 QValueAxis* vol_axisY = new QValueAxis; 27 //Y轴分成８份 28 vol_axisY->setTickCount(8); 29 //Y轴的范围 30 vol_axisY->setRange(0, 3500); 31 //Y的格式 32 vol_axisY->setLabelFormat("%i"); 33 vol_axisY->setTitleBrush(Qt::white); 34 vol_axisY->setLabelsColor(Qt::white); 35 // 36 vol_axisY->setGridLineVisible(false); 37 vol_axisY->setTitleFont(QFont("Montserrat", 13)); 38 vol_axisY->setLabelsFont(QFont("Montserrat", 10)); 39 vol_axisY->setTitleBrush(QColor(240, 133, 25)); 40 //设置Ｙ轴的标题 41 vol_axisY->setTitleText(QObject::tr("Voltage(V)")); 42 // 43 chart->addAxis(vol_axisY, Qt::AlignLeft); 44 _vol_series->attachAxis(vol_axisX); 45 _vol_series->attachAxis(vol_axisY); 46 //画布 47 chartView = new QChartView(chart, this); 48 chartView->setRenderHints(QPainter::Antialiasing); 49 chartView->setStyleSheet("background:rgb(0, 0, 200, 0);"); 50 // 51 chartView->setGeometry(0, 60, 890, 270); 52 timer = new QTimer(this); 53 connect(timer,SIGNAL(timeout()),this,SLOT(ontime())); 54 timer->start(1000); 55 } 56 57 58 void widget::ontime() 59 { 60 //产生一个数据 61 appendVolPlotValue(qrand()%3500); 62 } 63 64 65 //画线 66 void widget::appendVolPlotValue(int value) 67 { 68 // 69 if(nullptr != _vol_series) 70 { 71 // 72 73 int count = _vol_series->count()*10; 74 // 75 _vol_series->append(count, value); //点 76 // 77 if(count == 890) 78 { 79 _vol_series->clear(); 80 } 81 chartView->chart()->axisX()->setRange(0, 890); 82 }else{} 83 }
