QGraphicsScene size

来源：百度文库编辑：神马文学网时间：2024/04/28 18:05:50

QGraphicsScene size

Hi

I am trying to create a GraphicsView where I can draw using the entire window. To do this I create a GraphicsScene with the view's rect as constructor. The result is that I get scrollbars (although it shouldnt be needed as the scene should be the same size as the view) that are pre-scrolled (why does it scroll by itself?) a few pixels in both directions. What am I doing wrong here?

Qt Code:Switch view
#include #include #include #include int main(int argc, char* argv[]){QApplication app(argc, argv);QGraphicsView *view = new QGraphicsView;view->resize(640, 480);QGraphicsScene *scene = new QGraphicsScene(view->rect());scene->addItem(new QGraphicsSvgItem("ball.svg"));view->setScene(scene);view->show();return app.exec();}
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Re: QGraphicsScene size

QRect is a little weird.
The size is actually with 1 pxiel smaller in each direction( 639x479).
So you have to adjust it a bit.

Also, I used setFixedxSize since if you resize it, the scroll bars appear again.

Qt Code:Switch view
int main(int argc, char* argv[]){QApplication app(argc, argv);QGraphicsView *view = new QGraphicsView;view->setFixedSize(640, 480);QRect r = view->rect();r.adjust(1,1,-1,-1);QGraphicsScene *scene = new QGraphicsScene(r);//scene->addItem(new QGraphicsSvgItem("ball.svg"));view->setScene(scene);view->show();return app.exec();}
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Regards

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