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decide a point in what map[x][y]

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i use this method in rectangle smooth scrolling =================== int mapx=x /64; int mapy=y /64; int offsetx=x & 63; int offsety=y & 63; =================== it works.. but when i got into isometric tile .. this method seems can''t work.. because i can''t decide a point is inside a rhombus or not can somebody tell me how to do?

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