[ka-Map-users] Ka-map and AGG + Alpha? - Solved (need confirm)

[Sacha Black]

Hans, Zak, Paul, Lorenzo,

Thanks for your comments - think I finally got the AGG + Alpha (AGGA)
option to work. Hans maybe you can test the below and confirm?

I hope it works for you....

Sacha

+++++++++

[After Zak's last comment I realized that Paul's suggested code was
not being executed in tile.php, because the condition "if
($useAlphaCh)" was never true, after that was fixed, everything
worked]

here is the full set of what worked for me (the bottom 2 changes were
the final key):

///////////////// in the .map file: /////////////////

OUTPUTFORMAT
 NAME 'AGGA'
 DRIVER AGG/PNG
 IMAGEMODE RGBA
# FORMATOPTION "TRANSPARENT=ON"
END

and also for the relevant LAYER:

LAYER
  METADATA
     "IMAGEFORMAT" "AGGA"
  END
....
END

/////// in config php (around line 105): /////////////////

 $aszGMap = array (
         'title' => 'GMap 75',
         'path' => '../../gmap/htdocs/gmap_AGGA.map',
         'scales' => array( 40000000, 25000000, 12000000, 7500000,
3000000, 1000000 ),
         'format' =>'PNG'  /// <!-- doesn't seem to have an effect -->
 );

and (around line 210):

       case "AGGA":
           $GLOBALS['szMapImageFormat'] = 'AGGA';
           $GLOBALS['szMapImageCreateFunction'] = "imagecreatefrompng";
           $GLOBALS['szImageExtension'] = '.png';
           $GLOBALS['szImageCreateFunction'] = "imagecreatetruecolor";
           $GLOBALS['szImageOutputFunction'] = "imagepng";
           $GLOBALS['szImageHeader'] = 'image/png';
           break;


/////// in tile.php (around line 85): /////////////////

$useAlphaCh = false;
if (isset($_REQUEST['i'])) {
   setOutputFormat( $_REQUEST['i'] );
   if (strtoupper($_REQUEST['i']) == 'ALPHA') {
   	$useAlphaCh = true;
   }
   elseif (strtoupper($_REQUEST['i']) == 'AGGA') {    /// <-- also use
AlphaCh if AGGA
	$useAlphaCh = true;
  }
}

and lastly the fix from Paul (around line 315):

if ($useAlphaCh) {
     imageAlphaBlending($oTile, false);
     imagefill($oTile, 0, 0, imagecolorallocatealpha($oTile, 0, 0, 0, 127));
     imageSaveAlpha($oTile, true);  	
}