Creating buffer based on polyline without line end caps and without dissolving the created polygons in QGIS?

Question

I have a projected line layer (Shapefile) in QGIS. For every line segment I want to create a polygon without line end caps. The resulting polygone should not be dissolved to a single one.

I tried fTools buffering tool. This can create a buffer without dissolving, but its not possible to define the line end caps.

I tried also v.buffer of GRASS. This can create a buffer with defined line ends, but I cannot disable the dissolving.

Is there a possibility to have both: not dissolved and without caps at line end? The result should be a Shapefile with polygons (buffer) for every line segment.

Answer 1

With GRASS v.buffer press Iterate over this layer button.

Below (RHS) figure shows buffers, a buffer polygon layer per each polyline feature, without dissolved parts. Then merge output buffers. (Vector | Data Management Tools)

Answer 2

I imagine that this might be what you are after:

If so, I think you have to first break up your polylines into lines, e.g. using the 'Explode lines' processing tool.

Then, applying v.buffer as you mention above might leed to success.

update

What I just saw is that the 'Explode lines' tool shoots a little over the target, because it explodes each polyline into segments with only start- and endpoint and nothing in between...