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太棒了！什麼是1990年和1900年？爲什麼這個數字？ – skywind
這就是你的圈子的中心。我可以使用BBox來計算它以更一般化代碼，但認爲最好保持簡單;-) –
謝謝！你能幫助保存最後/當前位置嗎？ http://stackoverflow.com/questions/32682503/jquery-transform-rotation-how-to-save-last-angle – skywind