[mapserver-users] Adding symbols on top of polyline elements

[thomas bonfort]

it's the direction of the underlying geometry that's used.
so you either need
* data that's oriented, and a single boolean filed indicating if its
oneway or not,
* or an unoriented geometry, and a field indicating if the oneway
direction is reversed or not wrt the geometry (and two directional
symbols, one with > , the other with <)

cheers,
thomas

On Mon, Nov 10, 2008 at 12:01, Adrian Popa <adrian_gh.popa at romtelecom.ro> wrote:
> Hello Thomas,
>
> Thank you very much for your tip! It's great.
> However, I have a question: How can I select the direction of the arrow? I
> mean, between A and B I have a road segment:
>
> A----------------B
>
> Right now, it renders as A---->---->----->-----B, but I want it to render as
> A----<------<-----<------B.
>
> My question is: how does mapserver select the order of A and B? If I
> understand this, I can create another symbol and use it for the reverse
> path.
>
> Thanks,
> Adrian
>
> thomas bonfort wrote:
>
> Hi,
>
> for repeated arrow symbols, you can use a truetype (or image, or
> vector) symbol, with a negative GAP:
>
> SYMBOL
>  NAME oneway
>  TYPE TRUETYPE
>  CHARACTER '>'
>  FONT arial
>  GAP -20
> END
>
> and then in your layer:
>
> STYLE
>  SYMBOL oneway
>  SIZE 8
>  COLOR 0 0 0
> END
>
> cheers,
> thomas
>
> On Mon, Nov 10, 2008 at 10:51, Adrian Popa <adrian_gh.popa at romtelecom.ro>
> wrote:
>
>
> Hello everybody,
>
> I have a map that displays roads stored in a polyline format. I would like
> to mark one-way streets with an arrow symbol drawn on top of the road
> itself. The symbol can be as small as possible (for beginning I would like
> to be able to superimpose it anywhere between the street ends, and later on
> I will lock it to be next to one of the ends).
>
> I can already select the one way streets based on the following template:
>
>   CLASS
>
>      Name "OneWay"
>
>      EXPRESSION
> /^FO040127$|^FO040132$|^FO040139$|^FO040120$|^FO040104$|^FO040131$|^FO040146$|^FO040129$/
>      STYLE
>
>         COLOR 255 0 0
>
>         WIDTH 4
>
>      END
>
>      LABEL
>
>          COLOR 0 0 255
>
>          TYPE TRUETYPE
>
>          FONT arial
>
>          SIZE 8
>
>      ANTIALIAS TRUE
>
>
>          POSITION AUTO
>
>
>          ANGLE AUTO
>          PARTIALS TRUE
>
>
>          MINDISTANCE 0
>
>
>          BUFFER 0       END
>
>
>  END
>
> Can you show me an example of how to draw such a symbol on top of the layer?
> Thank you
>
> Adrian
>
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>
>
>
>
> --
> Adrian Popa
>
> Network Engineer
> Romtelecom S.A.
> Divizia Centrul National de Operare Retea
> Departament Transport IP & Metro
> Compartiment IP Core
>
>