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

Tue May 14 18:56:05 BST 2013

Hi WanMil,

ok, got it. 
I don't find code that assures that there are two directions. Isn't that
allowed?

Gerd

WanMil wrote
> 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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