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先確定繞哪個點旋轉,把影像上每一個點都連到那個點上(用虛線連起來),把這條線段按指定方向旋轉(大小不變,繞著那個點,自己理解下) 得出來的所有點再按原來的順序連起來就好了. 其實你按著書本多畫幾次就會了.
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