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嗨,我有一个带有位图图像的画布。现在我想缩放触摸部分并将其显示在画布上的固定位置。放大镜是如何工作的。直到现在我能够在位图上显示触摸部分的缩放视图但是问题是它会随着手指触摸不断移动,当我尝试修复它的位置时,它会产生不准确的结果。严重卡住请帮忙!