QPainter::begin: Paint device returned engine == 0, type: 1 QPainter::setRenderHint: Painter must be active to set rendering hints QPainter::setPen: Painter not active QPainter::setBrush: Painter not active 上面就是你的程序运行是的提示。 想要使用QPainter画图,就要继承QWidget,重写painterEvent虚函数,在里面画图。 Qt不像MFC在什么时间都可以画图,只有在painterEvent里面可以。 |
|