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In my map, there are lots of points in layer A. I want to make a line layer B and I want to make start & end points of lines snapping to points in layer A manually.

Can I use points of layer A as a coordinate attribute selection index for my line layer B? Thank you.

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Are you seeking an automated process (i.e. no mouse involved) or you want to draw the lines manually but wish for the points on layer A to be guides to start and end points of the line(s)? – nirvn Nov 21 '12 at 5:17
Yes I want to draw manually but I want to snap the lines to points A as a guide. – kazim.senocak Nov 21 '12 at 21:03

In Settings->Snapping options, you can select layers to which the points of a line can snap to.

You may set the snapping radius to 10 pixel in Settings->Options->Digitizing , to see the mouse snap to the points of the other layer.

After creation of the line, you may move the nodes with the node tool, where snapping is also working.

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