[josm-dev] Geometry support

Stefan Baebler stefan.baebler at gmail.com
Fri Apr 11 06:06:26 BST 2008

Quick impressions of the new extrude feature:
- drawing a L shaped building leaves an extra (redundant) node after 
extruding the second part (can be fixed with "delete unnecesarry nodes 
from a way" button)
- missing the initial angle a bit is hard to fix without redrawing from 
scratch (or giving up perfect right angles). Full geometry support would 
require rotate, resize,drawing rectangles, ellipses...

While testing this feature today i still ran into many complex buildings 
(eg schools with connected appendixes and city blocks with inner court 
yards) that were much easier to make an outline by hand than to use the 
extrude tool.

Since the raster image from WMS is usually the basis for outlining 
buildings it might be better to think in this direction - with a 
dedicated "building outliner" tool (like lakewalker that i never managed 
to use so far). User would select some small area on top of the building 
so that tool determines what color to trace, then detect edges and 
adjust the nodes slightly so that shape gets right (90 degree) angles.

I know, a patch is welcome, but this time you specifically asked for 
feedback :)


Karl Newman wrote:
> On Wed, Apr 9, 2008 at 12:35 AM, Andy Robinson (blackadder) <
> blackadderajr at googlemail.com> wrote:
>> Frederik
>> I find that I drag a way all too often inadvertently when moving nodes, ie
>> I
>> accidentally end up selecting the way rather than the node. So I'd
>> certainly
>> be happy to try the function for all way drags to get rid of the extra
>> mode.
>> I guess we would want a modifier to enable the actual move of a whole way.
>> I
>> do occasionally move whole ways (areas normally) that have been drawn from
>> landsat where a shift needs to be made to fit with later mapping from GPS.
>> Cheers
>> Andy
> +1 for a modifier key to drag ways.
> Karl
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