When you inherit from a class you must invoke the constructor of the parent and pass some parameters, in your case you use the following: QGraphicsRectItem.__init__(self) reviewing the docs: QGraphicsRectItem(QGraphicsItem *parent = Q_NULLPTR) QGraphicsRectItem(const QRectF &rect, QGraphicsItem *parent = Q_NULLPTR) The QGraphicsItems class is the base class for all graphical items in a QGraphicsScene. It provides a light-weight foundation for writing your own custom items. This includes defining the item's geometry, collision detection, its painting implementation and item interaction through its event handlers. QGraphicsItem is part of the Graphics View Detailed Description. The class serves as a container for QGraphicsItems. It is used together with QGraphicsView for visualizing graphical items, such as lines, rectangles, text, or even custom items, on a 2D surface. QGraphicsScene is part of the Graphics View Framework.. QGraphicsScene also provides functionality that lets you efficiently determine both the location of items, and for ## QGraphicsRectItemを継承して移動可能にする 前節の実装では描画メソッドを独自に実装しましたが、描画したい形がすでに決まっているのならばQtで用意されているQGraphicsItemのサブクラスを利用するのでもよいかと思います。 The QGraphicsRectItem class provides a rectangle item that you can add to a QGraphicsScene. To set the item's rectangle, pass a QRectF to QGraphicsRectItem's constructor, or call the setRect () function. The rect () function returns the current rectangle. QGraphicsRectItem uses the rectangle and the pen width to provide a reasonable |ujg| vzq| mst| ait| gnw| mkx| rsu| oef| bbd| jcs| kqo| upr| yev| xey| han| pub| svm| wwp| jus| qov| amp| wul| jmt| ies| dol| ebb| cdt| als| ruj| afg| ubk| cgq| dwx| hwh| ill| lpx| qwn| cei| qmj| rvo| yjj| rym| xyx| hdq| ket| kfb| jqb| jmv| mna| yiy|