[mapserver-users] lane presentation of highways

[Bob Basques]

That's about what I was describing in the second paragraph of my post, 
only I don't think you would need the third class you have listed, just 
set up a class, one for each direction, and only labels those based 
where a value exists.

bobb



Milo van der Linden wrote:
> Hello Martijn,
>
> I am able to help you on this one.
>
> There is no need to set a transparent line. It is a matter of defining 
> style based upon an attribute.
> First you need a definition for a class item:
>
> CLASSITEM 'DRIVING_DIRECTION'
>
> Then you set up classes for the directions:
>
> CLASS
>        NAME 'FROM_LEFT'
>      EXPRESSION 'FROM_LEFT'
>      MINSCALE 0
>      MAXSCALE 100000
>        STYLE
>          SYMBOL 0
>          SIZE 6
>          OFFSET -3 0
>          WIDTH 3
>          COLOR 249 201 139
>        END
>     END
>
> CLASS
>        NAME 'FROM_RIGHT'
>      EXPRESSION 'FROM_RIGHT'
>      MINSCALE 0
>      MAXSCALE 100000
>        STYLE
>          SYMBOL 0
>          SIZE 6
>          OFFSET 3 0
>          WIDTH 3
>          COLOR 249 201 139
>        END
>     END
>
> CLASS
>        NAME 'SINGLELANE'
>      EXPRESSION 'SINGLELANE'
>      MINSCALE 0
>      MAXSCALE 100000
>        STYLE
>          SYMBOL 0
>          SIZE 6
>          #OFFSET 3 0 #NO OFFSET
>          WIDTH 3
>          COLOR 249 201 139
>        END
>     END
>
>
>
>
> Martijn van der Pauw schreef:
>> If I have right understood, you suggest to add the lines as an 
>> attribute/arrowsymbol to a single (transparent) line that represents 
>> the highway. I will try to find out how to do something like that. 
>> Thank you for your suggestion. It sounds as a possible solution.
>>  
>> Martijn
>>
>> ------------------------------------------------------------------------
>> *Van:* Bob Basques  
>>  *Onderwerp:* Re: [mapserver-users] lane presentation of highways
>>
>> I can't think of a way of doing this, because you physically need to 
>> spread the two lines apart for the longer scale views if you want to 
>> see both.  I have a couple of ideas about how to label a wide sigle 
>> line though that would show both direction if they are attached as 
>> attributes.
>>
>> It might be possible to draw the lines, and then draw the layer 
>> again, drawing only with the Symbols on top (no lines), and then 
>> offset the arrow symbol locations,  Actually I think that would 
>> work.  I have something similar in a address range labeling layer.  
>> It would take a bit of trial and error to do though.
>>
>> You could still get into trouble though at longer range views, just 
>> because there won't physically be enough room to apply the labels.
>>
>> bobb
>>
>>
>> Martijn
>>>  
>>> The data is set up with two seperate lines, one for each direction. On the higher zoom levels you can already see the seperate lanes. But, unfortunately, when zoomed out they overlay each other of course.
>>>  
>>> Martijn
>>>
>>> ------------------------------------------------------------------------
>>> *Van:* Bob Basques [mailto:bob.b at gritechnologies.com]
>>>
>>>
>>> Is the data for the lines set up as single line layers, or are there 
>>> two separate lines, one for each direction?
>>>
>>> bobb
>>>
>>>
>>> Martijn wrote:
>>>>  
>>>> Hello, 
>>>>  
>>>> I'd like to know how I can plot the 2 seperate directions of a 
>>>> highway (I have the data in the database) in a way that they can be 
>>>> distinguished from each other at all zoomlevels. When you zoomed in 
>>>> a lot, you can always see the different driving directions (lanes), 
>>>> but when you zoom out they overlay each other. Important is that 
>>>> each lane is colored depending the road condition. So, the standard 
>>>> way of plotting a highway doesn't meet our needs. The colors of the 
>>>> 2 seperate driving directions can/will differ.
>>>>  
>>>>  Regards,
>>>> Waver
>>>>
>>>>  
>>>>
>>>>
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