Related links:
QT draws a histogram BarChart
QT draws a pie
chart PieChart
QT draws a curve graph SplineChart QT draws a scatter chart ScatterChart
QT draws an area chart AreaChart
0. Create ui window:
Mainly drag oneHorizontal Layout
1. Create a Qchart object:
QChart *chart = new QChart();
chart->setTitle("折线图图演示"); //设置表格标题
2. Create a QLineSeries object:
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. Create a QScatterSeries object:
// 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. Add QScatterSeries, QLineSeries to QChart
chart->addSeries(series1);
chart->addSeries(series2);
chart->addSeries(scatterSeries1);
chart->addSeries(scatterSeries2);
5. Chart comprehensive effect settings:
//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. Display chart:
QChartView *chartView;
chartView = new QChartView(chart);
ui->verticalLayout->insertWidget(chartView);
The overall code presentation:
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;
}