程序運(yùn)行截圖如下：

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原理：使用QPainter一個(gè)部分，一個(gè)部分的畫

源碼：

mygraphicsitem.h

#ifndef MYGRAPHICSITEM_H #define MYGRAPHICSITEM_H#include <QGraphicsItem>class MyGraphicsItem:public QGraphicsItem { public:MyGraphicsItem(QGraphicsItem *parent=0);~MyGraphicsItem();protected:QRectF boundingRect()const;void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget); };#endif // MYGRAPHICSITEM_H

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget> class QGraphicsScene;namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();private:Ui::Widget *ui;QGraphicsScene *m_scene; };#endif // WIDGET_H

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

mygraphicsitem.cpp

#include "mygraphicsitem.h" #include <QPainter> #include <QPen> #include <QRectF>MyGraphicsItem::MyGraphicsItem(QGraphicsItem *parent):QGraphicsItem(parent) {setFlags(QGraphicsItem::ItemIsSelectable|QGraphicsItem::ItemIsMovable); }MyGraphicsItem::~MyGraphicsItem() {}QRectF MyGraphicsItem::boundingRect() const {return QRectF(-14,-50,55,70); }void MyGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {Q_UNUSED(option)Q_UNUSED(widget)painter->setPen(QPen(Qt::white,1));painter->drawRect(-14,-50,55,70);painter->setPen(QPen(Qt::red,2));painter->drawLine(0,0,0,10);painter->drawLine(0,10,30,10);painter->drawLine(30,10,30,0);painter->drawLine(15,10,15,-20);painter->drawLine(15,-20,0,-20);QRectF rectangle(0,-33,30,30);int startAngle=-180*16;int spanAngle=270*16;painter->drawArc(rectangle, startAngle, spanAngle);painter->drawLine(15,-35,15,-40); }

widget.cpp

#include "widget.h" #include "ui_widget.h" #include "mygraphicsitem.h" #include <QGraphicsScene>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);m_scene=new QGraphicsScene;ui->graphicsView->setScene(m_scene);ui->graphicsView->setRenderHint(QPainter::Antialiasing);m_scene->setBackgroundBrush(QBrush(Qt::black));MyGraphicsItem *item=new MyGraphicsItem;item->setPos(0,0);m_scene->addItem(item); }Widget::~Widget() {delete ui; }

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