QT 中paintEvent的问题

[qq_41621832]

想要利用QT画一个雷达图，编写了如下的程序：
void RadarDlg::paintEvent( QPaintEvent * )
{
QPainter *painter = new QPainter(this);
painter->setRenderHint(QPainter::Antialiasing);
painter->setRenderHint(QPainter::SmoothPixmapTransform);
painter->setRenderHint(QPainter::TextAntialiasing);
drawRadarType(painter);
drawLabel(painter);
drawData(painter);
drawAxisLabel(painter);
}
但是运行时，会报警告：
QBackingStore::endPaint() called with active painter on backingstore paint device
QPaintDevice: Cannot destroy paint device that is being painted
然后给paintEvent加上begin()和end()
void CRadarDlg::paintEvent( QPaintEvent * )
{
QPainter *painter = new QPainter(this);
painter->begin (this);
painter->setRenderHint(QPainter::Antialiasing);
painter->setRenderHint(QPainter::SmoothPixmapTransform);
painter->setRenderHint(QPainter::TextAntialiasing);
drawRadarType(painter);
drawLabel(painter);
drawData(painter);
drawAxisLabel(painter);
painter->end ();
}
还是有警告：
QPainter::begin: Painter already active
请问该如何让解决？

[这是一个正经昵称]

试一下delete painter；painter=NULL；

[qq_41621832]

引用 1 楼 这是一个正经昵称 的回复:

试一下delete painter；painter=NULL；

试了一下，还是不行。

[这是一个正经昵称]

引用 2 楼 qq_41621832 的回复:

[quote=引用 1 楼 这是一个正经昵称 的回复:] 试一下delete painter；painter=NULL；

试了一下，还是不行。[/quote]

QPainter* p = new QPainter;
    p->begin(this);
    p->setBrush(QBrush(QColor(222,222,123)));
    p->drawRect(0,0,10,20);
    p->end();
    delete p;
    p=NULL;

[华木子薛]

这个不管用呀？楼主最后怎么解决的呢？求赐教。

[lingyunyicun]

QPainter p(this); 变成局部变量就好了

[MT_GH]

不要用指针就没问题