[ka-Map-users] Blank tiles
Paul Spencer
pspencer at dmsolutions.ca
Wed Oct 18 22:41:10 EDT 2006
Hi David,
a lot of people are reporting seemingly intermittent problems with
tile generation and png24 output. I have not experienced a problem
with actual tiles on disk being empty, but I have seen problems in IE
(because you are using transparency alpha, you will get a png that IE
will have problems with).
Is your problem only in IE? Do the actual tiles on disk have data in
them, or are they actually empty? Are all tiles in the same meta
tile (same directory) empty, or is it just one (or some) of them.
I suspect the image handling code for the IE case is not always
setting up the work-around code properly. Anyone else care to weigh
in on this?
Cheers
Paul
On 13-Oct-06, at 12:55 PM, davidvaz wrote:
> Hello,
>
> I am trying to use png24 as output, but some of the tiles appear
> blank.
> If I set the output in the map file to png it works.
>
> My mapfile and config.php is as follows:
>
> Thanks in advance,
>
> David Vaz
>
> MAP
> IMAGETYPE PNG24
> EXTENT -47193.675000 163096.225000 -34659.260000
> 168949.713000
> SHAPEPATH "/home/david/myddas/MapaCMP/Transformado"
> IMAGECOLOR 255 255 255
> UNITS METERS
> FONTSET "/mnt/var/www/porto/etc/fonts.txt"
>
> DEBUG ON
>
> WEB
> IMAGEPATH "/mnt/var/www/porto/tmp/"
> IMAGEURL "/porto/tmp/"
> METADATA
> "max_extents" "auto"
> # labels in work
> "version" "0.3"
> END
> END
>
> REFERENCE
> IMAGE "/mnt/var/www/porto/porto.png"
> SIZE 200 96
> EXTENT -47193.675000 163096.225000 -34659.260000 168949.713000
> STATUS ON
> END
>
> # Start of LAYER DEFINITIONS
> LAYER
> NAME "Base"
> DATA "quarteiroes_aff"
> STATUS ON
> TYPE POLYGON
> TRANSPARENCY ALPHA
>
> CLASS
> NAME "Limite Costa"
> EXPRESSION ([COD_COR] == 6)
> STYLE
> COLOR 235 230 220
> ANTIALIAS TRUE
> END
> END
>
> CLASS
> # "Rio Oceano" ([COD_COR] == 3)
> # "Rio Tinto" ([COD_COR] == 8)
> NAME "Rio Oceano"
> EXPRESSION ([COD_COR] == 3 || [COD_COR] == 8)
> STYLE
> COLOR 153 179 204
> ANTIALIAS TRUE
> END
> END
>
> CLASS
> NAME "Limite Concelho"
> EXPRESSION ([COD_COR] == 2)
> STYLE
> COLOR 204 195 177
> ANTIALIAS TRUE
> END
> END
>
> CLASS
> NAME "Canal Vias"
> EXPRESSION ([COD_COR] == 4)
> STYLE
> COLOR 255 255 255
> OUTLINECOLOR 171 158 137
> ANTIALIAS TRUE
> END
> END
>
> # "Separadores" ([COD_COR] == 9)
> # "Quart_Guias" ([COD_COR] == 1)
> # "Canal Metro CP" ([COD_COR] == 7)
>
> CLASS
> NAME "Other"
> STYLE
> COLOR 242 239 233
> OUTLINECOLOR 171 158 137
> ANTIALIAS TRUE
> END
> END
> END
>
> LAYER
> NAME "Eixos de Via da Cidade do Porto"
> DATA "eixos_via_aff"
> STATUS ON
> TYPE LINE
> LabelItem "NOME"
> TRANSPARENCY ALPHA
>
> CLASS
> NAME "1000"
> MAXSCALE 1000
>
> LABEL
> FONT sans-bold
> TYPE truetype
> SIZE 10
>
> ANGLE FOLLOW
> POSITION AUTO
> PARTIALS FALSE
>
> COLOR 0 0 0
> OUTLINECOLOR 255 255 255
> ANTIALIAS TRUE
> END
> END
> CLASS
> NAME "5000"
> MINSCALE 500
> MAXSCALE 5000
>
> LABEL
> FONT sans
> TYPE truetype
> SIZE 8
>
> ANGLE FOLLOW
> POSITION AUTO
> PARTIALS FALSE
>
> COLOR 0 0 0
> OUTLINECOLOR 255 255 255
> ANTIALIAS TRUE
> END
> END
> END
> END
>
> <?php
> /
> **********************************************************************
> *
> * $Id: config.dist.php,v 1.12 2006/07/05 15:17:34 dmorissette Exp $
> *
> * purpose: configuration file for kaMap, hopefully well documented
> *
> * author: Paul Spencer (pspencer at dmsolutions.ca)
> *
> * TODO:
> *
> * - consider moving per-map configuration to metadata in map files
> *
>
> **********************************************************************
> *
> * Copyright (c) 2005, DM Solutions Group Inc.
> *
> * Permission is hereby granted, free of charge, to any person
> obtaining a
> * copy of this software and associated documentation files (the
> "Software"),
> * to deal in the Software without restriction, including without
> limitation
> * the rights to use, copy, modify, merge, publish, distribute,
> sublicense,
> * and/or sell copies of the Software, and to permit persons to
> whom the
> * Software is furnished to do so, subject to the following
> conditions:
> *
> * The above copyright notice and this permission notice shall be
> included
> * in all copies or substantial portions of the Software.
> *
> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> EXPRESS OR
> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL
> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR
> OTHER
> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> * DEALINGS IN THE SOFTWARE.
> *
>
> **********************************************************************
> /
>
> /
> **********************************************************************
> ********
> * basic system configuration
> *
> * kaMap! uses PHP/MapScript and the PHP GD extension to
> * render tiles, and uses PHP/MapScript to generate initialization
> parameters
> * a legend, and a keymap from the selected map file.
> *
> * Make sure to set the correct module names for your PHP extensions.
> *
> * WINDOWS USERS: you will likely need to use php_gd2.dll instead of
> php_gd.dll
> */
> $szPHPMapScriptModule = 'php_mapscript.'.PHP_SHLIB_SUFFIX;
> $szPHPGDModule = 'gd.'.PHP_SHLIB_SUFFIX;
>
> /
> **********************************************************************
> ********
> * tile generation parameters
> *
> * kaMap! generates tiles to load in the client application by first
> rendering
> * larger areas from the map file and then slicing them up into
> smaller
> tiles.
> * This approach reduces the overhead of loading PHP/MapScript and PHP
> GD and
> * drawing the map file. These larger areas are referred to as
> metaTiles in
> * the code. You can set the size of both the small tiles and the
> metaTiles
> * here. A reasonable size for the small tiles seems to be 200 pixels
> square.
> * Smaller tiles seem to cause problems in client browsers by causing
> too many
> * images to be created and thus slowing performance of live dragging.
> Larger
> * tiles take longer to download to the client and are inefficient.
> *
> * The number of smaller tiles that form a metaTile can also be
> configured.
> * This parameter allows tuning of the tile generator to ensure
> optimal
> * performance and for label placement. MapServer will produce
> labels only
> * within a rendered area. If the area is too small then features
> may be
> * labelled multiple times. If the area is too large, it may exceed
> MapServer,s
> * maximum map size (by default 2000x2000) or be too resource-
> intensive
> on the
> * server, ultimately reducing performance.
> */
> $tileWidth = 256;
> $tileHeight =256;
> $metaWidth = 6;
> $metaHeight = 6;
> /* $metaBuffer = Buffer size in pixels to add around metatiles to
> avoid
> * rendering issues along the edge of the map image
> */
> $metaBuffer = 128;
>
> /
> **********************************************************************
> ********
> * in-image debugging information - tile location, outlines etc.
> * to use this, you need to remove images from your cache first.
> This also
> * affects the meta tiles - if debug is on, they are not deleted.
> */
> $bDebug = false;
>
> /
> **********************************************************************
> ********
> * aszMapFiles - an array of map files available to the application.
> How this
> * is used is determined by the application. Each map file is
> entered into
> * this array as a key->value pair.
> *
> * The key is the name to be used by the tile caching system to
> store cached
> * tiles within the base cache directory. This key should be a
> single word
> * that uniquely identifies the map.
> *
> * The value associated with each key is an array of three values.
> The
> first
> * value is a human-readable name to be presented to the user
> (should the
> * application choose to do so) and the second value is the path to
> the map
> * file. It is assumed that the map file is fully configured for
> use with
> * MapServer/MapScript as no error checking or setting of values is
> done. The
> * third value is an array of scale values for zooming.
> */
>
> $aszGMap = array (
> 'title' => 'porto',
> 'path' => '/mnt/var/www/porto/porto.map',
> 'scales' => array(30000, 25000, 20000, 15000, 10000, 5000,
> 2500 , 1000, 500),
> 'format' =>'PNG24'
> /* Sample authorized_users entry. See auth.php for more
> details:
> * ,'authorized_users' => array('popplace' => array('user1',
> 'user2'),
> * 'park' => array('user1')
> */
> );
>
>
> $aszMapFiles = array( 'porto' => $aszGMap
>
> /* Add more elements to this array to offer multiple mapfiles */
>
> );
>
> /
> **********************************************************************
> ********
> * figure out which map file to use and set up the necessary
> variables for
> * the rest of the code to use. This does need to be done on every
> page
> load
> * unfortunately.
> *
> * szMap should be set to the default map file to use but can
> change if
> * this script is called with map=<mapname>.
> */
> $szMap = 'porto';
>
> /
> **********************************************************************
> ********
> * kaMap! caching
> *
> * this is the directory within which kaMap! will create its tile
> cache. The
> * directory does NOT have to be web-accessible, but it must be
> writable
> by the
> * web-server-user and allow creation of both directories AND files.
> *
> * the tile caching system will create a separate subdirectory within
> the base
> * cache directory for each map file. Within the cache directory for
> each map
> * file, directories will be created for each group of layers. Within
> the group
> * directories, directories will be created at each of the
> configured scales
> * for the application (see mapfile configuration above.)
> */
> $szBaseCacheDir = "/mnt/var/www/porto/tmp/";
>
> /* Uncomment the following if you have a web accessible cache */
> $szBaseWebCache = "/mnt/var/www/porto/tmp/";
>
> /
> **********************************************************************
> ********
> * Authentication and access control:
> *
> * Uncomment the following lines to load auth.php and enable access
> control.
> * See docs at the top of auth.php for more details.
> */
> //include_once('auth.php');
> //$oAuth = new
> kaBasicAuthentication(&$aszMapFiles[$szMap]['authorized_users']);
>
>
> /***** END OF CONFIGURABLE STUFF - unless you know what you are doing
> *****/
>
> if (isset($_REQUEST['map']) && isset($aszMapFiles[$_REQUEST['map']]))
> {
> $szMap = $_REQUEST['map'];
> }
>
> $szMapCacheDir = $szBaseCacheDir.$szMap;
> $szMapName = $aszMapFiles[$szMap]['title'];
> $szMapFile = $aszMapFiles[$szMap]['path'];
> $anScales = $aszMapFiles[$szMap]['scales'];
> setOutputFormat($aszMapFiles[$szMap]['format']);
> /
> **********************************************************************
> ********
> * output format of the map and resulting tiles
> *
> * The output format used with MapServer can greatly affect
> appearance and
> * performance. It is recommended to use an 8 bit format such as PNG
> *
> * NOTE: the tile caching code in tile.php is not configurable
> here. It
> * currently assumes that it is outputting 8bit PNG files. If you
> change to
> * PNG24 here then you will need to update tile.php to use the gd
> function
> * imagecreatetruecolor. If you change the output format to jpeg then
> * you would need to change imagepng() to imagejpeg(). A nice
> enhancement
> * would be to make that fully configurable from here.
> *
> * DITHERED is a special output format that uses the 24bit png
> renderer to
> * render the entire map and then quantizes the final image into
> some number
> * number of colours just before saving, typically 256.
> *
> * To use DITHERED, you need MapServer 4.9 CVS after 2006-03-08, or
> any
> later
> * release. You also need to create an OUTPUTFORMAT block in your
> * map file as follows:
> *
> OUTPUTFORMAT
> NAME dithered
> DRIVER "GD/PNG"
> EXTENSION "png"
> MIMETYPE "image/png"
> IMAGEMODE RGBA
> TRANSPARENT OFF
> FORMATOPTION "QUANTIZE_FORCE=ON"
> FORMATOPTION "QUANTIZE_DITHER=OFF"
> FORMATOPTION "QUANTIZE_COLORS=256"
> END
> *
> */
> function setOutputFormat($szFormat)
> {
> switch(strtoupper($szFormat)) {
> case "DITHERED":
> $GLOBALS['szMapImageFormat'] = 'dithered';
> $GLOBALS['szMapImageCreateFunction'] =
> "imagecreatefrompng";
> $GLOBALS['szImageExtension'] = '.png';
> $GLOBALS['szImageCreateFunction'] = "imagecreate";
> $GLOBALS['szImageOutputFunction'] = "imagepng";
> $GLOBALS['szImageHeader'] = 'image/png';
> break;
> case "PNG24":
> $GLOBALS['szMapImageFormat'] = 'PNG24';
> $GLOBALS['szMapImageCreateFunction'] =
> "imagecreatefrompng";
> $GLOBALS['szImageExtension'] = '.png';
> $GLOBALS['szImageCreateFunction'] =
> "imagecreatetruecolor";
> $GLOBALS['szImageOutputFunction'] = "imagepng";
> $GLOBALS['szImageHeader'] = 'image/png';
> break;
> case "ALPHA":
> $GLOBALS['szMapImageFormat'] = 'PNG24';
> $GLOBALS['szMapImageCreateFunction'] =
> "imagecreatefrompng";
> $GLOBALS['szImageExtension'] = '.png';
> $GLOBALS['szImageCreateFunction'] =
> "imagecreatetruecolor";
> $GLOBALS['szImageOutputFunction'] = "imagepng";
> $GLOBALS['szImageHeader'] = 'image/png';
> break;
> case "GIF":
> $GLOBALS['szMapImageFormat'] = 'GIF';
> $GLOBALS['szMapImageCreateFunction'] =
> "imagecreatefromgif";
> $GLOBALS['szImageExtension'] = '.gif';
> $GLOBALS['szImageCreateFunction'] = "imagecreate";
> $GLOBALS['szImageOutputFunction'] = "imagegif";
> $GLOBALS['szImageHeader'] = 'image/gif';
> break;
> case "JPEG":
> $GLOBALS['szMapImageFormat'] = 'JPEG';
> $GLOBALS['szMapImageCreateFunction'] =
> "imagecreatefromjpeg";
> $GLOBALS['szImageExtension'] = '.jpg';
> $GLOBALS['szImageCreateFunction'] =
> "imagecreatetruecolor";
> $GLOBALS['szImageOutputFunction'] = "imagejpeg";
> $GLOBALS['szImageHeader'] = 'image/jpeg';
> break;
> case "PNG":
> $GLOBALS['szMapImageFormat'] = 'PNG';
> $GLOBALS['szMapImageCreateFunction'] =
> "imagecreatefrompng";
> $GLOBALS['szImageExtension'] = '.png';
> $GLOBALS['szImageCreateFunction'] = "imagecreate";
> $GLOBALS['szImageOutputFunction'] = "imagepng";
> $GLOBALS['szImageHeader'] = 'image/png';
> break;
> }
> }
>
> /**
> * create all directories in a directory tree - found on the php
> web site
> * under the mkdir function ...
> */
> function makeDirs($strPath, $mode = 0777)
> {
> return is_dir($strPath) or ( makeDirs(dirname($strPath), $mode) and
> mkdir($strPath, $mode) );
> }
>
> /**
> * This function replaces all special characters in the given string.
> *
> * @param szString string - The string to convert.
> *
> * @return string converted
> */
> function normalizeString($szString)
> {
> // Normalize string by replacing all special characters
> // e.g. "http://my.host.com/cgi-bin/mywms?"
> // becomes "http___my_host_com_cgi_bin_mywms_"
> return preg_replace("/(\W)/", "_", $szString);
> }
> ?>
>
>
>
>
> _______________________________________________
> ka-Map-users mailing list
> ka-Map-users at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/ka-map-users
+-----------------------------------------------------------------+
|Paul Spencer pspencer at dmsolutions.ca |
+-----------------------------------------------------------------+
|Chief Technology Officer |
|DM Solutions Group Inc http://www.dmsolutions.ca/ |
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