Show zoomed view of bitmap on canvas at fix position similiar to magnifying glass

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Hie, I have a canvas with bitmap image on it.Now i want to zoom touched portion and display it at fix position on canvas.Just how the magnifying glass works.Till now i am able to display zoomed view of touched portion on bitmap but the problem is it keeps on moving with the finger touch and when i try to fix its position, it produces inaccurate results.Badly stucked please do help!

Bitmap on canvas when not touched

Magnifying glass showing zoomed view hovering with bitmap touch

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