[ka-Map-users] Bug in label rendering

[Loïc MAZE]

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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