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swift 座標 判定位置

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初めまして、Xcodのswiftの初心者です。

Image.viewがある範囲内に行くと一定の位置に移動する
プログラムを作っているのですが、普段座標の判定位置は
X,Yは00で右上ですが、赤い位置で反応したいと考えています。
座標.png
center.xで・・・yはどうしたらよいのかわかりません
根本的に違うのでしょうか?
どのようにすればよいのでしょうか?

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