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
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
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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