[OSM-talk] JOSM dual-carriageway feature - "alpha" test version

[Ray Booysen]

Very nice. :)

On 1/13/07, matthew-osm at newtoncomputing.co.uk <
matthew-osm at newtoncomputing.co.uk> wrote:
>
> Hi,
>
> I've been working on a feature for JOSM to auto-align the distance of
> nodes on
> dual-carriageways. You can currently do the following:
>
>   a) Select two nodes - they will be be set to a set distance apart from
> each
>      other.
>
>   b) Select two ways - each pair of nodes in the ways will be set to a set
>      distance apart from each other.
>
> This is obviously intended, like the Align in Circle patch, for when you
> have
> the underlying data and can make sure things are placed in the correct
> positions. Please don't use it on roads where you don't know that the
> carriageways don't diverge from each other...
>
> Currently there are some limitations. Notes are below:
>
> * the distance is fixed - it is nominally 30 metres, if my great circle
> distance
>   calculations are correct. There should be a dialog that allow this to be
> set.
>
> * node distances are set, but the nodes are not rotated. I have worked out
> an
>   algorithm and this will be implemented next. This means that things can
> look a
>   bit distorted if nodes are not fairly well placed initially.
>
> * ways of differing lengths and/or different numbers of nodes may have
> unusual
>   results. There are semi-plans for ignoring parts of ways that are not
>   relevant. However, nodes should generally be in pairs along the way
> already
>   otherwise it will break. Currently one end of the ways must be aligned.
>
>   this will work:
>
>   *---->*----->*---------->*------->*-------->*
>   *----->*---->*--------->*--------->*
>
>   this will break:
>
>   *---->*----->*---------->*------->*-------->*
>          *---->*--------->*--------->*
>
> * ways with branches are not supported - they must be paths. I do not
> consider
>   this to be a bug ;-)
>
> * you might see some dialog boxes with debugging info in; to be removed.
>
> JOSM 191 with the patch is available from the below location, as well as
> the
> patch itself. Suggestions/patches to improve the code please - I'm not a
> Java
> programmer, and get very worked up that I could code it 90% less lines in
> perl
> ;-)
>
>   http://dl.newtoncomputing.co.uk/josm191_equidist_ways.patch
>   http://dl.newtoncomputing.co.uk/josm-equidist.jar
>
> I'll be away until mid-week now, so may not respond quickly to replies,
> sorry.
>
> Thanks,
>
> --
> Matthew
>
>
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>



-- 
Ray Booysen
raybooysen at rjb.za.net
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