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i'm facing a problem when it comes to snapping a line from one layer to an outline from a different layer

what i'm doing is drawing a polygon and i added another style to it and had it offset outwards from the polygon, and i want a line from another layer to snap to the outline from the polygon layer..not the polygon itself, i tried lowering the resolution of the snapping but it still doesn't snap to the outline just the polygon...any ideas on how to solve this?

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You need to create a buffer polygon to snap the line to it. You can set the which layers to snap from Settings -> Snapping options, as follows:

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  1. Change the snapping mode to Advanced
  2. Select the layers you need to snap. Set the mode to to vertex and segment, tolerance of 10 and Units: pixels. The OUTPUT.shp (in this example) is the buffer layer
  3. Uncheck the layers that you don't want to snap to.

enter image description here

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