Changing symbol icon on the fly

[Aaron Craig]

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Using mapscript (perl, but any generic example will do) what's the
preferred way to change the icon of a point, in a layer that is defined
as follows:

LAYER
~  NAME "musei"
~  TYPE POINT
~  STATUS OFF

~  CONNECTION 'user=tsc2 password=tsc2 dbname=geo_sardegna'
~  CONNECTIONTYPE POSTGIS
~  DATA 'the_point from musei'

~  CLASS
~    NAME "musei"
~    STYLE
~    SYMBOL
"/var/www/OpenPortal/htdocs/confartigianato/Images/icona_small.gif"
~    SIZE  10
~    COLOR 0 0 0
~  END
END


I'm doing

my $lyrPoints = $map->getLayerByName($sLayerName);

$lyrPoints->{status} = $mapscript::MS_ON;
my $cls = $lyrPoints->getClass(0); # change this if we ever use layers
with more than one class
my $stl = $cls->getStyle(0); # change this if we ever use classes with
more than one style
my $nSymbolIndex = $stl->{symbol};

my $sym = $map->{symbolset}->getSymbol($nSymbolIndex);
$sym->{imagepath} =
"/var/www/OpenPortal/htdocs/confartigianato/Images/$sLayerName.gif";

my $pnt = mapscript::pointObj->new();
$pnt->{x}       = $x;
$pnt->{y}       = $y;

$pnt->draw($map, $lyrPoints, $img, undef, $label);

but the image on the point remains the same as is declared in the mapfile.


- --
Aaron Craig
mercutio at pobox.com

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