Hi List,
I'm using MS4W 3.0.6 (MapServer version 6.0.3) with PHP-mapscript, but
this problem occured on older versions too.
I have an tile-indexed raster-layer for topografic maps (for the german
users: it's the TK 25 from NRW).
The tiffs are colour-indexed, so I use several classes like this:
[SNIP]
CLASS
NAME "Beschriftung"
EXPRESSION ([pixel] = 13)
STYLE
COLOR 0 0 0
END
END
[/SNIP]
I want to give the user with our web client the possibility, to hide
some classes, so I tried the following mapscript:
[SNIP]
for($cc=0; $cc < $map_file_layer_object->numclasses; $cc++){
$map_file_layer_object->getClass($cc)->status = $some_boolean_variable;
}
[/SNIP]
where some_boolean_variable sets the class-status to on (=visible) or
off (=hidden).
Unfortunatly, this only works for feature-layers, but has no effect on
raster-layers.
Hint: Setting "STATUS OFF" in the mapfile doen't work with
raster-layers, too. The class is allways drawn.
Is this a bug or am I doing something wrong?
Ludwig
P.S.:
As workaround i got the same effect with
[SNIP]
if(!$some_boolean_variable){
for($sc=0; $sc < $map_file_class->numstyles; $sc++){
$map_file_class->getStyle($sc)->opacity = 0;
}
}
[/SNIP]
but this seems too complicated...
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