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QGraphicsLineItem with long line on huge QGraphicsScene

How do I properly use a huge QGraphicsLineItem or a huge custom QGraphicsItem, ensuring that only visible parts are painted to maintain performance?

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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
    9.