[ka-Map-users] Bug in label rendering

Thu Nov 16 06:28:24 EST 2006

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
>
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> 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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