[ka-Map-users] Bug in label rendering

Loïc MAZE lm at geosphere.fr
Thu Nov 16 08:23:44 EST 2006 

Hy Paul,

Thanks for your advice. Unfortunately, I have already played with the 
$metaBuffer var and have no result. I have tried many combinations by 
changing the $metaBuffer var (config.php) and the $tileBuffer var 
(tile_nocache.php). If the value of the $metaBuffer var is too low, labels 
are still duplicated; and if the value is too high, labels are often not 
drawn (but some of them are well drawn): 
http://img172.imageshack.us/img172/8778/tile4iz1.jpg .

Regards,
Loïc


----- Original Message ----- 
From: "Paul Spencer" <pspencer at dmsolutions.ca>
To: "Loïc MAZE" <lm at geosphere.fr>
Cc: "Christopher Schmidt" <crschmidt at crschmidt.net>; "Mailing de Ka-Map" 
<ka-map-users at lists.maptools.org>
Sent: Thursday, November 16, 2006 12:28 PM
Subject: Re: [ka-Map-users] Bug in label rendering


> Try changing the value of $metaBuffer in config.php to 10.
>
> Cheers
>
> Paul
>
> On 16-Nov-06, at 5:40 AM, Loïc MAZE wrote:
>
>> I have today another problem with the label rendering function. It  is 
>> difficult to explain such a problem for me so please don't blame  me for 
>> my poor English. The most important thing is I must use the 
>> tile_nocache.php file to generate my tiles.
>>
>> I have added a layer in my mapfile in order to show labels of  roads. The 
>> type of this layer is LINE. If I set the $tileBuffer var  to 0, all my 
>> labels are well drawn (the position of labels in the  mapfile must be set 
>> to the value AUTO in order to be drawn in a  tile. The PARTIALS value is 
>> of course, set to FALSE).
>>
>> The problem is I have also another layer with labels. The type of  this 
>> layer is POINT. If I keep the $tileBuffer var to 0, symbols  are 
>> truncated at tile boundaries but all the labels of this layer  are well 
>> drawn.
>> Here's a screenshot of the problem: http://img169.imageshack.us/ 
>> img169/1242/tile2pz9.jpg .The blue line is the tile boundaries  (drawn 
>> with the plugin Firebug).
>>
>> If I increase the $tileBuffer var, symbols are not truncated but  labels 
>> are duplicated (because the symbol is drawn on two tiles): 
>> http://img169.imageshack.us/img169/4369/tile1as5.jpg
>>
>> And if I increase the $tileBuffer var to a high value, the  performance 
>> of Ka-map comes down and the labels in my road layer  are truncated: 
>> http://img93.imageshack.us/img93/6325/tile3zb4.jpg
>>
>> I have searched a fix all the day and I have found nothing to do  for the 
>> moment.
>> Many thanks in advance.
>>
>> Regards,
>> Loïc
>>
>>
>>
>>
>> ----- Original Message ----- From: "Loïc MAZE" <lm at geosphere.fr>
>> To: "Loïc MAZE" <lm at geosphere.fr>; "Christopher Schmidt" 
>> <crschmidt at crschmidt.net>
>> Cc: "Mailing de Ka-Map" <ka-map-users at lists.maptools.org>
>> Sent: Tuesday, November 14, 2006 5:01 PM
>> Subject: Re: [ka-Map-users] Bug in label rendering
>>
>>
>>> I have increased the value of the $tileBuffer var in the 
>>> tile_nocache.php file and it works perfectly now. This var seems  to 
>>> have the same purpose as the $metaBuffer var in the tile.php  file. 
>>> Sorry for the warning and hope this will be helpful for the  others. 
>>> Maybe it will be interesting the $tileBuffer var receive  the same value 
>>> as the $metaBuffer var (in config.php file).
>>>
>>> Regards,
>>> Loïc
>>>
>>>
>>> ----- Original Message ----- From: "Loïc MAZE" <lm at geosphere.fr>
>>> To: "Christopher Schmidt" <crschmidt at crschmidt.net>
>>> Cc: "Mailing de Ka-Map" <ka-map-users at lists.maptools.org>
>>> Sent: Tuesday, November 14, 2006 3:24 PM
>>> Subject: Re: [ka-Map-users] Bug in label rendering
>>>
>>>
>>>> All my label layers have "PARTIALS OFF".
>>>> Here's an example of the values I use in my mapfile :
>>>>
>>>> LABEL
>>>>        FONT "times"
>>>>        SIZE 14
>>>>        TYPE TRUETYPE
>>>>        BUFFER 0
>>>>        COLOR 0 0 0
>>>>        FORCE TRUE
>>>>        OFFSET 0 0
>>>>        PARTIALS OFF
>>>>        POSITION CC
>>>> END
>>>>
>>>> I have played a long time by changing those values but I have no 
>>>> result. I can notice that if FORCE has FALSE value, the labels  are not 
>>>> visible any more (with TRUE value they are truncated),  but it is 
>>>> probably not the problem...
>>>>
>>>> Regards,
>>>> Loïc
>>>>
>>>>
>>>> ----- Original Message ----- From: "Christopher Schmidt" 
>>>> <crschmidt at crschmidt.net>
>>>> To: "Loïc MAZE" <lm at geosphere.fr>
>>>> Cc: "Mailing de Ka-Map" <ka-map-users at lists.maptools.org>
>>>> Sent: Tuesday, November 14, 2006 3:07 PM
>>>> Subject: Re: [ka-Map-users] Bug in label rendering
>>>>
>>>>
>>>>> On Tue, Nov 14, 2006 at 02:55:46PM +0100, Loïc MAZE wrote:
>>>>>> Hi all,
>>>>>>
>>>>>> I have some troubles with the current version of Ka-map. I  would 
>>>>>> like to draw some labels thanks to the label object used  by 
>>>>>> Mapserver to define a label. They are well drawn by Ka-Map  but they 
>>>>>> are often truncated at tile boundaries. It happens  when the label is 
>>>>>> too long to be contained by one tile. It  really seems like this bug 
>>>>>> : http://bugzilla.maptools.org/ show_bug.cgi?id=1379 . It is marked 
>>>>>> as resolved for the 0.2  version of Ka-Map but changing the 
>>>>>> $metaBuffer var (in  config.php) doesn't work for me. I have played 
>>>>>> with the values  of the other vars contained in this file but I was 
>>>>>> unsuccessful.
>>>>>
>>>>> Does your mapfile have "PARTIALS OFF" on your label layers? This is
>>>>> probably important: it prevents mapsever from trying to draw off  the
>>>>> edge of the map. If this isn't the case, ka-Map won't draw them
>>>>> correctly regardless, because its edge label prevention is  simply not
>>>>> taken into account.
>>>>>
>>>>> I'd recommend trying that, and if it doesn't work, report back.
>>>>>
>>>>> Regards,
>>>>> -- 
>>>>> Christopher Schmidt
>>>>> Web Developer
>>>>
>>>> _______________________________________________
>>>> ka-Map-users mailing list
>>>> ka-Map-users at lists.maptools.org
>>>> http://lists.maptools.org/mailman/listinfo/ka-map-users
>>
>> _______________________________________________
>> 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/ |
> +-----------------------------------------------------------------+
>
>
>

More information about the ka-Map-users mailing list