QT绘制折线图 QLineSeries

相关链接：
QT绘制直方图BarChart
QT绘制饼状图PieChart
QT绘制曲线图SplineChart
QT绘制散点图ScatterChart
QT绘制面积图AreaChart

0.创建ui窗口：

主要就是拖拉一个Horizontal Layout

1.创建Qchart对象：

QChart *chart = new QChart();
chart->setTitle("折线图图演示"); //设置表格标题

2.创建QLineSeries对象：

QLineSeries *series1 = new QLineSeries(chart);
QLineSeries *series2 = new QLineSeries(chart);

series1->setName("A店铺接单数");// 设置名称
series2->setName("B店铺接单数");

// 载入节点
// 也可以这样写：<< QPointF(0,6);
series1->append(0,6); 
series1->append(1,10);
series1->append(4,12);
series1->append(6,5);

series2->append(0,18);
series2->append(3,13);
series2->append(5,7);
series2->append(6,2);

3.创建QScatterSeries对象：

// 突出显示节点图的节点
QScatterSeries *scatterSeries1 = new QScatterSeries();
scatterSeries1->setPointLabelsFormat("@yPoint");
scatterSeries1->setPointLabelsVisible();
scatterSeries1->setMarkerSize(5); // 设置节点大小
// *scatterSeries1 << QPointF(0,6);也可以
scatterSeries1->append(0,6);
scatterSeries1->append(1,10);
scatterSeries1->append(4,12);
scatterSeries1->append(6,5);
    
QScatterSeries *scatterSeries2 = new QScatterSeries();
scatterSeries2->setPointLabelsFormat("@yPoint");
scatterSeries2->setPointLabelsVisible();
scatterSeries2->setMarkerSize(5);
scatterSeries2->append(0,18);
scatterSeries2->append(3,13);
scatterSeries2->append(5,7);
scatterSeries2->append(6,2);

4.将QScatterSeries，QLineSeries添加到QChart

chart->addSeries(series1);
chart->addSeries(series2);
chart->addSeries(scatterSeries1);
chart->addSeries(scatterSeries2);

5.图表综合效果设置：

//设置动画效果
chart->setAnimationOptions(QChart::AllAnimations);

chart->createDefaultAxes();//设置网格线
chart->axes(Qt::Horizontal).first()->setRange(0, 7);//设置x轴范围
chart->axes(Qt::Vertical).first()->setRange(0, 20);//设置y轴范围

// Add space to label to add space between labels and axis 在标签和轴之间加空格
QValueAxis *axisY = qobject_cast<QValueAxis*>(chart->axes(Qt::Vertical).first());
Q_ASSERT(axisY);
axisY->setLabelFormat("%.1f  ");

//设置图表主题(会修改到扇区的颜色)
// 可选： QChart::ChartThemeLight
// QChart::ChartThemeBlueCerulean
// QChart::ChartThemeDark
// QChart::ChartThemeBrownSand
// QChart::ChartThemeBlueNcs
// QChart::ChartThemeHighContrast
// QChart::ChartThemeBlueIcy
// QChart::ChartThemeQt
chart->setTheme(QChart::ChartThemeDark);

6.显示图表：

QChartView *chartView;
chartView = new QChartView(chart);
ui->verticalLayout->insertWidget(chartView);

代码整体呈现：

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtCharts>

QT_BEGIN_NAMESPACE
namespace Ui {
    
     class MainWindow; }
QT_END_NAMESPACE

QT_CHARTS_BEGIN_NAMESPACE
class QChartView;
class QChart;
QT_CHARTS_END_NAMESPACE

QT_CHARTS_USE_NAMESPACE

class MainWindow : public QMainWindow
{
    
    
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
    QChart * createLineChart() const; // 绘制自定义的折线图
private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    
    
    ui->setupUi(this);

	// 创建QChartView 对象
	QChartView *chartView;
	// QChartView 对象载入折线图
	chartView = new QChartView(createLineChart());
	// 显示图标
	ui->verticalLayout->insertWidget(chartView);

}

MainWindow::~MainWindow()
{
    
    
    delete ui;
}

// 绘制折线图
QChart *MainWindow::createLineChart() const
{
    
    
    QChart *chart = new QChart();
    chart->setTitle("折线图演示");


    QLineSeries *series1 = new QLineSeries(chart);
    QLineSeries *series2 = new QLineSeries(chart);

    series1->setName("A店铺接单数");
    series2->setName("B店铺接单数");

    series1->append(0,6);
    series1->append(1,10);
    series1->append(4,12);
    series1->append(6,5);

    series2->append(0,18);
    series2->append(3,13);
    series2->append(5,7);
    series2->append(6,2);

    chart->addSeries(series1);
    chart->addSeries(series2);

    QScatterSeries *scatterSeries1 = new QScatterSeries();
    scatterSeries1->setPointLabelsFormat("@yPoint");
    scatterSeries1->setPointLabelsVisible();
    scatterSeries1->setMarkerSize(5);
    // *scatterSeries1 << QPointF(0,6);也可以
    scatterSeries1->append(0,6);
    scatterSeries1->append(1,10);
    scatterSeries1->append(4,12);
    scatterSeries1->append(6,5);
    
    QScatterSeries *scatterSeries2 = new QScatterSeries();
    scatterSeries2->setPointLabelsFormat("@yPoint");
    scatterSeries2->setPointLabelsVisible();
    scatterSeries2->setMarkerSize(5);
    scatterSeries2->append(0,18);
    scatterSeries2->append(3,13);
    scatterSeries2->append(5,7);
    scatterSeries2->append(6,2);
    chart->addSeries(scatterSeries1);
    chart->addSeries(scatterSeries2);

    chart->legend()->hide();//隐藏legend（图例）
    
    //设置动画效果
    chart->setAnimationOptions(QChart::AllAnimations);

    chart->createDefaultAxes();// 设置网格
    chart->axes(Qt::Horizontal).first()->setRange(0, 7);//设置x轴范围
    chart->axes(Qt::Vertical).first()->setRange(0, 20);//设置y轴范围

    // Add space to label to add space between labels and axis 在标签和轴之间加空格
    QValueAxis *axisY = qobject_cast<QValueAxis*>(chart->axes(Qt::Vertical).first());
    Q_ASSERT(axisY);
    axisY->setLabelFormat("%.1f  ");
    chart->setTheme(QChart::ChartThemeDark);
    return chart;
}