[mapserver-users] baby steps with MapScript (problem)

[Mr. Puneet Kishor]

I am relearning MapScript after years of innocence. I have a fairly simple script like so (also at http://pastebin.com/7rehitjH). The image is created, but is empty, plain white. There is some silliness on my part, something obvious I am overlooking or doing wrong, and I need someone to point it to me. Needless to say, the same map draws fine via MapServer CGI --

my $map = new mapscript::mapObj();
warn "New mapObj() error: $mapscript::ms_error->{message}\n" unless $map;

$map->{status} = $mapscript::MS_ON;                             # STATUS ON
$map->{units} = $mapscript::MS_DD;                              # UNITS DD
$map->setImageType('png');                                      # IMAGETYPE PNG
$map->{imagecolor} = new mapscript::colorObj(255, 255, 255);    # IMAGECOLOR 255 255 255
$map->setSize(1000, 600);                                       # SIZE 1000 600
$map->setExtent( -180, -90, 180, 90 );                          # EXTENT -180 -90 180 90
$map->selectOutputFormat( 'png' );                              # Choose active output format
$map->setProjection( "proj=latlong" );                          # PROJECTION
                                                                #   "proj=latlong"
                                                                # END

my $outputFormatObj = new mapscript::outputFormatObj('GD/PNG'); # DRIVER "GD/PNG"
$outputFormatObj->setExtension('png');                          # EXTENSION "png"
$outputFormatObj->setMimetype('image/png');                     # MIMETYPE "image/png"
$outputFormatObj->{imagemode} = $mapscript::MS_IMAGEMODE_RGB;   # IMAGEMODE RGB | PC256

$map->setOutputFormat( $outputFormatObj );

my $layerObj = new mapscript::layerObj($map);
$layerObj->setConnectionType($mapscript::MS_POSTGIS, '');
$layerObj->{connection} = "host=127.0.0.1 port=5432 dbname=$db user=$dbuser password=$pwd";
$layerObj->{data} = 'the_geom FROM table USING UNIQUE gid';
    
my $classObj = new mapscript::classObj($layerObj);
$classObj->{name} = 'foo';

my $styleObj = new mapscript::styleObj($classObj);        
$styleObj->{color} = new mapscript::colorObj( 132, 132, 132);
$styleObj->{outlinecolor} = new mapscript::colorObj(0, 0, 0);
 
# create an image for drawing.
my $img = $map->draw();
warn "prepareImage() error: $mapscript::ms_error->{message}\n" unless $img;

$img->save("$tmp_dir/$image_name");