新手求教学QT画长方形的时候一直不显示,该怎么解决_QT开发

新手求教学QT画长方形的时候一直不显示
画长方形 .cpp代码如下

C/C++ code

#include <QtGui>#include <QPushButton>#include <QFont>#include <QSpinBox>#include <QSlider>#include <QHBoxLayout>#include <QWidget>#include <Qt>#include <QPainter>#include "test.h"Test::Test(QWidget *parent):QWidget(parent){    resize(800,600);    setWindowTitle(QObject::tr("Paint　Demo"));}void Test::paint(QPaintEvent *){   QPainter painter(this);    painter.setRenderHint(QPainter::Antialiasing, true);    painter.drawLine( 80,100,100,100 );    painter.setPen( Qt::red );    painter.drawRect(10,10,100,400);    painter.setPen( QPen(Qt::green,5));    painter.setBrush( Qt::blue );    painter.drawEllipse( 50,150,400,200 );    painter.save();}头文件代码如下：#ifndef TEST_H#define TEST_H#include <QtGui/QMainWindow>class Test:public QWidget{    Q_OBJECTpublic:        Test(QWidget *parent = 0);protected:private:    void paint(QPaintEvent *event);};#endifmain.cpp代码#include <QtGui/QApplication>#include "test.h"int main(int argc, char *argv[]){    QApplication a(argc, argv);    Test w;    w.show();    return a.exec();}

我用的是LINUX下的QT creator
能运行，标题栏也改了，但是就是不更改颜色。用time也更新过，QOBJECT也试过注释，希望各位师哥师姐指点下啊。还有就是输出汉字的问题，这边运行tr的时候说是未声明.加上QOBJECT行了可是还是乱码，能一并解决了么？在线等，谢谢

------解决方案--------------------
1.

C/C++ code

//void paint(QPaintEvent *event);void paintEvent(QPaintEvent *event);
------解决方案--------------------
1,在paintEvent事件里执行

2,用QGraphicsView