[mkgmap-dev] bug in add road-speed-min & add road-speed-max implementation.

Thu Aug 30 12:47:33 BST 2012

There is a bug in the implementation of the road-speed-min and 
road-speed-max command.

Here is a table of what is happening, and what should happen:

Status quo --> Current Behaviour --> Supposed Behaviour - highway with 
road_speed=X and road_class=Y, next to a point which has the following 
action added: add mkgmap:road-class ='-1'; add mkgmap:road-class-min='1' 
; add mkgmap:road-class-max='3' ; add mkgmap:road-speed ='-1';  add 
mkgmap:road-speed-min='1' ; add mkgmap:road-speed-max='3'
XY  ---> XY ---> XY
00  ---> 11 ---> 00
11  ---> 11 ---> 00
22  ---> 11 ---> 11
33  ---> 22 ---> 22
44  ---> 33 ---> 33
45  ---> 33 ---> 33 (34 would also be a logically sound solution, as the 
decrease was maximum 1, but it decreased 2).

While in this case the road-class-max=3 and road-speed-max=3 is working 
correctly (though of course it is stupid to set a road-class-max if you 
decrease the road-class or road-speed - so it is debatable on how to 
logically solve this ), the important bit of road-class-min and 
road-class-max is heavily failing. Instead of decreasing it, it actually 
increases it.
If you work with add mkgmap:road-class ='+1 ' or mkgmap:road-speed='+1', 
the same problem is of course happening.

-- 
keep on biking and discovering new trails

Felix
openmtbmap.org & www.velomap.org