利用Qt的Qcharts库实现时间/温度变化波形绘制 可自定义名称、颜色等

#include "widget.h" #include "ui_widget.h" Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); createChart(); } Widget::~Widget() { delete ui; } void Widget::createChart() { //创建对象 m_Chart = new QChart; m_chLoadSerise= new QSplineSeries; m_chLoadSerise->clear(); m_axisX = new QDateTimeAxis; m_axisY = new QValueAxis; //坐标、波形属性设置 QDateTime timeStart=QDateTime::currentDateTime(); QDateTime timeEnd=timeStart.addSecs(1800); m_Chart->setTitle("温度变化曲线");//坐标系名称 m_axisX->setTitleText("时间");//横坐标名称 m_axisX->setTitleBrush(Qt::white);//横坐标名称字体颜色 m_axisX->setFormat("hh:mm:ss");//横坐标时间格式 m_axisX->setRange(timeStart, timeEnd);//设置横坐标时间范围 m_axisX->setTickCount(10);//设置横坐标格数（间隔） m_axisY->setTitleText("温度(℃)");//纵坐标名称 m_axisY->setTitleBrush(Qt::white);//纵坐标名称字体颜色 m_axisY->setLabelFormat("%.1f");//纵坐标温度小数位数 m_axisY->setRange(0,25);//纵坐标范围 m_axisY->setTickCount(10);//设置纵坐标格数（间隔） m_chLoadSerise->setName("温度值");//曲线名称 m_Chart->addSeries(m_chLoadSerise);//曲线加入到坐标 m_Chart->setAxisX(m_axisX, m_chLoadSerise);//横坐标加入曲线 m_Chart->setAxisY(m_axisY, m_chLoadSerise);//纵坐标加入曲线 //m_Chart->setTheme(QChart::ChartThemeDark);//设置坐标背景颜色 m_Chart->setBackgroundVisible(false);//设置坐标系背景透明透明 m_Chart->legend()->setVisible(true);//曲线图例显示 m_Chart->legend()->setAlignment(Qt::AlignBottom);//图例位置 m_Chart->legend()->setLabelColor(Qt::white);//图例颜色 m_Chart->setTitleBrush(Qt::white);//坐标系名称颜色 m_Chart->axisX()->setLabelsColor(Qt::white);//横坐标刻度颜色 m_Chart->axisY()->setLabelsColor(Qt::white);//纵坐标刻度颜色 ui->widget_chartView->setChart(m_Chart);//画布加入到widget控件中（注：在ui界面需将widget提升控件为QChartView） ui->widget_chartView->setRenderHint(QPainter::Antialiasing);//防止图形走样 m_chLoadSerise->append(timeStart.toMSecsSinceEpoch(),5); m_chLoadSerise->append(timeStart.addSecs(200).toMSecsSinceEpoch(),5.5); m_chLoadSerise->append(timeStart.addSecs(500).toMSecsSinceEpoch(),5.6); m_chLoadSerise->append(timeStart.addSecs(800).toMSecsSinceEpoch(),5.8); m_chLoadSerise->append(timeStart.addSecs(1200).toMSecsSinceEpoch(),6); m_chLoadSerise->append(timeStart.addSecs(1500).toMSecsSinceEpoch(),7); m_chLoadSerise->append(timeStart.addSecs(1700).toMSecsSinceEpoch(),12); }