dynamic symbol rotation

[Brent Fraser]

Franceso,

  I ran into this a couple of years ago, and I don't think the situation has changed.

The short answer is no, there is no map file keyword to indicate the field to use as the rotation value.


The long answer is there are a couple of work-arounds that might work for you:

1.  Use LABEL with POSITION CC and LABELANGLEITEM to indicate the field with the rotation
        - if you want to have a text label along with the "symbol" then you'll to define another LAYER just for that
        - this will only work for using TrueType fonts for symbols (it won't work for Bitmap or Vector symbols)

OR

2. Create different symbols for the different directions, and then use CLASS and EXPRESSION to assign the appropriate symbol for the different values in the field.
    -  We used this method to show ship symbols based on a "heading" attribute:

   CLASS
       EXPRESSION ([HEADING]<23 or [HEADING]>337)
       SYMBOL 'arrowup'
       SIZE 10
       COLOR 255 0 0
       OUTLINECOLOR 0 0 0
   END # CLASS
   CLASS
       EXPRESSION ([HEADING]>=23 and [HEADING]<67)
       SYMBOL 'arrowuprt'
         :

In this case we generalized the heading values to eight different symbols representing eight points on a compasss.

I don't think there is any work planned to allow rotation of symbols.

Brent Fraser

  ----- Original Message ----- 
  From: Francesco Sozzi 
  To: MAPSERVER-USERS at LISTS.UMN.EDU 
  Sent: Thursday, March 24, 2005 3:40 AM
  Subject: [UMN_MAPSERVER-USERS] dynamic symbol rotation


  Hi all,

  I would like to rotate point symbols reading rotation angle from a field.
  I think that at this version it is not possible.
  Anybody knows if this possibility will be provided in any future release?

  Regards

  Francesco
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