[mapserver-users] How to show/hide labels?

[Hankley, Chip]

You could have your labels done as a separate layer in the mapfile
(annotation) and then turn that layer on / off based on whatever criteria
you want to use for 'dynamically' showing or hiding labels...

Here's an example of a layer definition from one of my mapfiles that shows
only annotation (the data source is a polygon shapefile)...i.e. this layer
will display only the labels based on the 'feat_name' field of the
shapefile... it WON'T draw the polygon outline, etc.

...
LAYER
  NAME "Feat_Labels"
  STATUS Default
  DATA ml3_feat
  LABELCACHE ON
  TYPE ANNOTATION
  LABELITEM "feat_name"
  CLASS
    COLOR 255 255 255
    LABEL
      FORCE TRUE
      POSITION CC
      SIZE TINY
      OUTLINECOLOR 255 255 255
      BACKGROUNDCOLOR 255 255 204
      BACKGROUNDSHADOWCOLOR 221 221 221
      BACKGROUNDSHADOWSIZE 1 1
      MINDISTANCE 2
      COLOR 0 0 0
      WRAP "$"
    END
  END
END # Annotation Layer
...

In php...

$map = ms_newMapObj("test.map");
$MyLayer = $map->getlayerbyname("Feat_Labels");
$MyLayer->set("status", 1); //display the layer
//OR
$MyLayer->set("status", 0); //hide the layer

Chip



-----Original Message-----
From: Greg Liapis [mailto:gregliapis at hotmail.com]
Sent: Wednesday, November 14, 2001 1:13 PM
To: mapserver-users at lists.gis.umn.edu
Subject: [mapserver-users] How to show/hide labels?


Hi all,
I am new to map server and this question may seem a little silly.
Is there a method in PHP/Mapscript to show or hide labels dynamically?
Thanks.

Greg Liapis
Greece