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Display google earth kml in qgraphicsview issue

  • i want to display kml's path in my map application. but the kml contains too much lines and points, maybe thousands. i used a lot of QGraphicsLineItem,and when the map zoom, the QGraphicsLineItem need to use setLine function again to recalculate its coordinate to scale with the map together. the problem is that the application is blocked because too much lineitem need to be update.
    does anyone can give me some advices?

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