[mapserver-users] lane presentation of highways

[Martijn van der Pauw]

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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