[mkgmap-dev] [PATCH v1] Remove one direction of motorways in overview

Tue May 14 18:29:52 BST 2013

Hi Gerd,

the angle() function calculates the angle between start/end point of the 
way and one axis (to be honest I haven't check if it's the lat or lon 
axis...).

I don't need to check if the ways are parallel. For motorways I assume 
that there are two parallel ways. Using the angle method I select only 
one of both because one way has an angle >= 0° and the other < 0°. It's 
not working perfect but it's ok for a quick test if merging ways in the 
overview map benefits.

WanMil

> Hi WanMil,
>
> I would like to implement an isSimilar() methid as suggested by Steve:
> http://gis.19327.n5.nabble.com/ways-are-deleted-when-not-routable-tp5760424p5760727.html
>
> but I don't understand how your function calculates an angle between just
> two points.
> I think I have to compare two bearings to find out if two lines are
> parallel?
>
> Gerd
>
>
> WanMil wrote
>> Attached patch gives a little try how we could remove the duplicate
>> motorways in the overview map. Usually both directions of a motorway are
>> painted on each other.
>>
>> The patch removes all motorway segments from the overview map that span
>> an angle 0° to 180° between first and last point of a segment.
>>
>> It should not be commited because I think we could do better with a
>> specialized filter (?) but it's an easy prototype to check if it's
>> worthy to start such an implementation.
>>
>> WanMil
>>
>> _______________________________________________
>> mkgmap-dev mailing list
>
>> mkgmap-dev at .org
>
>> http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>
>> motorway_undup_v1.patch (4K)
>> &lt;http://gis.19327.n5.nabble.com/attachment/5760869/0/motorway_undup_v1.patch&gt;
>
>
>
>
>
> --
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