[ka-Map-users] Bug in label rendering

Loïc MAZE lm at geosphere.fr
Tue Nov 21 03:29:09 EST 2006 

Hi all,

Sorry about that, but is there any news about this problem? It is important 
for me and I have searched a solution several days but I have found no way 
to fix it. For the moment the best solution I have found is to have small 
symbols so if they are truncated it isn't too visible. But it isn't a real 
solution. I can send you my mapfile and my shapefiles if you want to 
reproduce this bug. Must I also create a bug report?

Regards,
Loïc


----- Original Message ----- 
From: "Loïc MAZE" <lm at geosphere.fr>
To: "Paul Spencer" <pspencer at dmsolutions.ca>
Cc: "Mailing de Ka-Map" <ka-map-users at lists.maptools.org>
Sent: Thursday, November 16, 2006 2:23 PM
Subject: Re: [ka-Map-users] Bug in label rendering


> 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
>>>>>
>>>>> _______________________________________________
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>>>>> http://lists.maptools.org/mailman/listinfo/ka-map-users
>>>
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>>
>> +-----------------------------------------------------------------+
>> |Paul Spencer                          pspencer at dmsolutions.ca    |
>> +-----------------------------------------------------------------+
>> |Chief Technology Officer                                         |
>> |DM Solutions Group Inc                http://www.dmsolutions.ca/ |
>> +-----------------------------------------------------------------+
>>
>>
>>
>
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