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並前往https://stackoverflow.com/questions/61510946/update-qgraphicslineitem-correctly

Update QGraphicsLineItem correctly - Stack Overflow

The problem is caused because the QGraphicsScene object is not initialized with a bounding box. In the constructor use

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查詢 「QGraphicsLineItem」的人也找了：

  1. QGraphicsItem
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  2. QGraphicsView
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  3. Qgraphicsitem line
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  4. QGraphicsItem paint
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  5. QGraphicsScene
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  6. QGraphicsSceneMouseEvent
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  7. QPen
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  8. QGraphicsRectItem
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