先看效果，后上源码：
下面是自定义的一个控件类：
#ifndef DIALWIDGET_H#define DIALWIDGET_H#include <QWidget>class DialWidget : public QWidget{Q_OBJECTpublic:explicit DialWidget(QWidget *parent = nullptr);~DialWidget();void paintEvent(QPaintEvent *);void drawBg(QPainter *painter);void drawScale(QPainter *painter);void drawScaleNum(QPainter *painter);void drawPointer(QPainter *painter);void drawText(QPainter *painter);void setValue(int val);int getValue();int radius;int value =0;};#endif // DIALWIDGET_H
下面是控件类的源文件：
#include "dialwidget.h"#include<QPainter>#include<QtMath>DialWidget::DialWidget(QWidget *parent) :QWidget(
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