我不清楚 Graphics View 是怎麼設計的,但官方的說明文件裡有這麼一段話
"Graphics View uses a BSP (Binary Space Partitioning) tree to provide very fast item discovery, and as a result of this, it can visualize large scenes in real-time, even with millions of items."
我想十幾萬比起幾百萬不算什麼吧