1.效果图

2.代码如下

2.1 .h文件

#ifndef PIECHARTWIDGET_H
#define PIECHARTWIDGET_H#include <QWidget>
#include <QChartView>
#include <QPieSeries>#include<QVBoxLayout>
#include<QMessageBox>
#include <QtCharts>struct PieData
{QString type_s;qreal value_q;
};class PieChartWidget : public QWidget
{Q_OBJECTpublic:PieChartWidget(QWidget *parent = nullptr);~PieChartWidget();//设置图表标题void f_setTitle(const QString& title);//设置图表数据void f_setSeries(const QMap<QString, int> &data);void f_insert_one(const QString& newType,const int& newValue);void f_delete_one(const QString& deleteType);private slots:void f_updata_label();private:QChartView *chartView; // 图表视图QChart *chart; // 图表QPieSeries *series; // 饼图数据系列//数据// QMap<QString, int> pieData;};
#endif // PIECHARTWIDGET_H

2.2 .cpp文件

#include "piechartwidget.h"PieChartWidget::PieChartWidget(QWidget *parent): QWidget(parent)
{// 创建饼图数据系列series = new QPieSeries();// 创建图表并添加饼图数据系列chart = new QChart();chart->addSeries(series);// 创建图例chart->legend()->setVisible(true);//图例位置chart->legend()->setAlignment(Qt::AlignRight);// 创建一个QColor对象，表示浅蓝色QColor lightBlue = QColor(173, 216, 230); // 使用RGB值表示浅蓝色，RGB值为(173, 216, 230)// 创建一个QBrush对象，设置背景颜色为浅蓝色QBrush brush(lightBlue);// 使用setBrush方法设置图表的背景画刷为浅蓝色chart->setBackgroundBrush(brush);// 创建图表视图，并设置图表chartView = new QChartView(chart, this);chartView->setRenderHint(QPainter::Antialiasing);// 将图表视图添加到布局中QVBoxLayout *layout = new QVBoxLayout(this);layout->addWidget(chartView);// 连接数据系列的信号到自定义槽函数connect(series, &QPieSeries::added, this, &PieChartWidget::f_updata_label);connect(series, &QPieSeries::removed, this, &PieChartWidget::f_updata_label);// 连接饼图点击事件的信号和槽QObject::connect(series, &QPieSeries::clicked, [=](QPieSlice *slice){// 添加点击效果动画// 迭代所有饼片并将其还原if(slice->isExploded()){slice->setExploded(false);return;}for (QPieSlice *s : series->slices()) {s->setExploded(false);}slice->setExploded(true);slice->setLabelVisible(true);slice->setExplodeDistanceFactor(0.2);});}PieChartWidget::~PieChartWidget()
{}void PieChartWidget::f_setTitle(const QString &title)
{chart->setTitle(title);
}void PieChartWidget::f_setSeries(const QMap<QString, int> &data)
{// 清空之前的数据系列series->clear();// 更新 pieData// 添加新的图表数据for (auto it = data.begin(); it != data.end(); ++it){series->append(it.key(), it.value());}}void PieChartWidget::f_insert_one(const QString &newType, const int &newValue)
{// series->append(newType, newValue);bool isExist = false;// 获取所有的数据项QList<QPieSlice *> slices = series->slices();for (int i = 0; i < slices.size(); i++) {if (slices.at(i)->label().contains(newType)) {  // 如果类别已存在isExist = true;// slices.at(i)->setValue(newValue);// 如果类别已存在，则将原值与新值相加int oldValue = slices.at(i)->value();slices.at(i)->setValue(oldValue + newValue);break;}}if (!isExist) {  // 如果类别不存在，则添加新的数据项series->append(newType, newValue);}f_updata_label();
}void PieChartWidget::f_delete_one(const QString &deleteType)
{// 从饼图系列中删除特定类型的数据for (QPieSlice *slice : series->slices()) {qDebug()<<slice->label()<<deleteType;if (slice->label().contains(deleteType)) {qDebug()<<"从饼图系列中删除特定类型的数据";series->remove(slice);return;}}}//更新百分比
void PieChartWidget::f_updata_label()
{for (int i = 0; i < series->count(); ++i) {QPieSlice *slice = series->slices().at(i);QString currentLabel = slice->label();// 如果当前标签已包含百分比信息，则只更新百分比内容QRegularExpression regex("\\d+\\.\\d+%");if(regex.match(currentLabel).hasMatch()) {QStringList labelParts = currentLabel.split(" ");int lastSpaceIndex = currentLabel.lastIndexOf(" ");  // 获取最后一个空格的索引QString category = currentLabel.mid(0, lastSpaceIndex);  // 提取空格前的部分作为类别QString updatedLabel = QString("%1 %2%").arg(category).arg(100 * slice->percentage(), 0, 'f', 1);slice->setLabel(updatedLabel);} else {  // 否则，在当前标签后面添加百分比信息slice->setLabel(QString("%1 %2%").arg(slice->label()).arg(100 * slice->percentage(), 0, 'f', 1));}}//是否显示在图表上series->setLabelsVisible(true);//箭头指内，注释指外// series->setLabelsPosition(QPieSlice::LabelInsideTangential);
}

3. main

#include "piechartwidget.h"#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);PieChartWidget w;// 创建 QMap 存储数据QMap<QString, int> data;data.insert("Category A", 30);data.insert("Category B", 20);data.insert("Category C", 50);w.f_setTitle("测试饼图");w.f_setSeries(data);w.f_insert_one("新数据",20);QString delete_s="Category C";w.f_delete_one(delete_s);w.f_insert_one("新数据",40);w.show();return a.exec();
}

2.4 .pro文件

QT       += core gui chartsgreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++17# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \piechartwidget.cppHEADERS += \piechartwidget.h# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target