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How can get a rectangle selection from the user and use it for imageprocessing filters?

April 26, 2017filters rectangle selection user

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How can get a rectangle selection from the user and use it for imageprocessing filters?

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One way is to let the user draw a rectangle. The rectangle will never be stored in a vector layer, instead we just extract its coordinates after creation. Here is a complete VB.NET Windows Forms demo using THBImage to get the selection from the user.