Plot temperature curves; QChart,

.pro

QT += core gui charts

widget.h

#include "widget.h"#include "ui_widget.h"#include #include #include #include #include #include Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget){ui->setupUi(this);this->setLayout(ui->verticalLayout);//1 Create a chart view; here it is created directly in the ui//QChartView *chartView = new QChartView();//2, create a chart;QChart *chart = new QChart();//3. Create the coordinate axis;QValueAxis *valueAxisX = new QValueAxis();QValueAxis *valueAxisY = new QValueAxis();//4. Set the coordinate axis range;valueAxisX->setRange(0,5000);valueAxisY->setRange(0,110);//5. Set the axis title and display format;valueAxisX->setTitleText("time/ms");valueAxisY->setTitleText("temperature/℃");valueAxisX->setLabelFormat("%d");valueAxisY->setLabelFormat("%.2f");//Set the precision of the coordinate axis;valueAxisX->setTickCount(11);valueAxisY->setTickCount(11);//6. Add axes to the chart;chart->addAxis(valueAxisX,Qt::AlignBottom);chart->addAxis(valueAxisY,Qt::AlignLeft);//7. Set the title and legend display of the chart;chart->setTitle("Temperature change chart");chart->legend()->setVisible(false);//8. Create a curve;QSplineSeries *splineSeres = new QSplineSeries;splineSeres->append(0,50);splineSeres->append(1000,100);splineSeres->append(2000,80);splineSeres->append(3000,40);splineSeres->append(4000,60);splineSeres->append(5000,50);//9, set the color of the curve;QPen pen(QColor(0xff5566));pen.setWidth(5);splineSeres->setPen(pen);//10. Add a line to the chart;chart->addSeries(splineSeres);//11. Connect the curve and the coordinate axis;splineSeres->attachAxis(valueAxisX);splineSeres->attachAxis(valueAxisY);//12. Place the chart in the chart view and display it;ui->chartView->setChart(chart);}Widget::~Widget(){delete ui;}

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