[mapserver-users] Smaller polygon sizes when usingmapserver 5.4.1compare to 5.2.0

[Nikolai Nikolov]

Hi Thomas,

Please note, that this Mapserver behaviour (correct or incorrect) still
exists in 5.4.1 version, when the GD library is used.  The change of
behaviour affects the rendering of the background when AGG library is used.

Also, in the documentation, the use of BACKGROUNDCOLOR is regarded as
creating a "billboard" effect.  It would be nice to have capability to
control the size (and appearance) of this "billboard", which seems to exist
in the older 5.2.0 version, but have been partially removed in the new 5.4.1
version.

The other point was about the rendering of polygons. I would suggest to put
some kind of a note or explanation for the 5.4.1 version, that when the
OUTLINECOLOR is not specified, the polygon will be one pixel smaller in size
in all directions, from the real one and to avoid this, the OUTLINECOLOR
needs to be always defined either with the same colour as the rest of the
polygon or with another desired colour.

Best regards,
Nick

-----Original Message-----
From: Thomas Bonfort [mailto:thomas.bonfort at camptocamp.com] 
Sent: 15 July 2009 06:36
To: Steve Lime
Cc: nnikolov at gypsii.com; mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Smaller polygon sizes when usingmapserver
5.4.1compare to 5.2.0

the previous versions of mapserver (incorrectly I think) used the
value of the label buffer to expand the background billboard. You'd
get nice results whith a 1 or 2 px buffer like in your case, but
unusable ones when you added larger buffers.

I hope we can work around this for 5.6 with the possible label style
rewrite.

regards,

thomas

www.camptocamp.com
+33 4 79 26 57 97



On Tue, Jul 14, 2009 at 03:01, Steve Lime<Steve.Lime at dnr.state.mn.us> wrote:
> Wonder if it's the same issue as with the polygon size you noted. Even
though the shield
> is a rect it's rendered as a polygon. Thomas, should polygons be drawn
with an outline
> same as the fill color if no outline color is specifiied?
>
> Steve
>
>>>> "Nikolai Nikolov" <nnikolov at gypsii.com> 07/09/09 2:43 AM >>>
> Hi Steve and everyone,
>
> The images below are from Mapserver 5.2.0 (left) and 5.4.1 (right) of the
> same map using AGG. Please note the difference in the size of the road
> shields (green shields).
>
> The following are images from the same servers (Mapserver 5.2.0 (left) and
> 5.4.1 (right)) of the same map (different zoom) using GD.  Please note
that
> the two maps are practically the same.
>
> The complete map-file used for the first example is attached to this
e-mail.
> The parts of it specific to the issue are like that:
>
>
>
>    OUTPUTFORMAT
>
>        NAME AGG_PNG
>
>        DRIVER AGG/PNG
>
>        MIMETYPE  "image/png"
>
>        IMAGEMODE RGB
>
>        EXTENSION  "png"
>
>        #FORMATOPTION "QUANTIZE_FORCE=TRUE"
>
>        #FORMATOPTION "QUANTIZE_COLORS=256"
>
>        FORMATOPTION "PALETTE_FORCE=TRUE"
>
>        FORMATOPTION "PALETTE=/var/www/html/maps_gypsii/palette.txt"
>
>        FORMATOPTION "INTERLACE=OFF"
>
>    END
>
>
>
> and
>
>        CLASS
>
>            EXPRESSION /^E/
>
>            LABEL
>
>                PRIORITY 4
>
>                PARTIALS false
>
>                MINFEATURESIZE 10
>
>                MINDISTANCE 300
>
>                COLOR 255 255 255
>
>                BACKGROUNDCOLOR 128 208 100
>
>                BACKGROUNDSHADOWCOLOR 81 145 58
>
>                ANGLE 0
>
>                BUFFER 2
>
>                FONT arial-bold
>
>                TYPE truetype
>
>                SIZE 7
>
>            END
>
>        END
>
>
>
> The difference for the second examples is in the output format used:
>
>
>
>    OUTPUTFORMAT
>
>        NAME PNG
>
>        DRIVER GD/PNG
>
>        MIMETYPE  "image/png"
>
>        IMAGEMODE RGB
>
>        EXTENSION  "png"
>
>        #FORMATOPTION "QUANTIZE_FORCE=TRUE"
>
>        #FORMATOPTION "QUANTIZE_COLORS=256"
>
>        FORMATOPTION "PALETTE_FORCE=TRUE"
>
>        FORMATOPTION "PALETTE=/var/www/html/maps_gypsii/palette.txt"
>
>        FORMATOPTION "INTERLACE=OFF"
>
>    END
>
>
>
> Many thanks,
>
> Nick
>
>
>
>
>
> -----Original Message-----
> From: Steve Lime [mailto:Steve.Lime at dnr.state.mn.us]
> Sent: 08 July 2009 15:29
> To: Nikolai Nikolov; mapserver-users at lists.osgeo.org
> Subject: Re: [mapserver-users] Smaller polygon sizes when usingmapserver
> 5.4.1compare to 5.2.0
>
>
>
> Perhaps you could post image samples and a mapfile?
>
>
>
> Steve
>
>
>
>>>> On 7/8/2009 at 3:05 AM, in message
>
> <65D1C555BE9443A180F3B1697EF7E69F at BenefonUK.local>, "Nikolai Nikolov"
>
> <nnikolov at gypsii.com> wrote:
>
>> Hi everyone,
>
>>
>
>>
>
>>
>
>> I've just upgraded one of my test servers from 5.2.0 to 5.4.1.  I have an
>
>> issue there and I wonder whether anybody have noticed it.  My map
> polygones
>
>> seems to be fractionaly smaller (compare to those drawned by 5.2.0).
>
>>
>
>>
>
>>
>
>> I am using the same maps, map files, PHP scripts, etc.  The plygons which
>
>> belong to the same layer, do not quite well "fit" with each other - their
>
>> borders match perfectly before the upgarde to 5.4.1.
>
>>
>
>>
>
>>
>
>> Also, I use BACKGROUNDCOLOR in my map file to create shield like square
>
>> behind a label.  Those squares are now significantly smaller too.
>
>>
>
>>
>
>>
>
>> I wander what causes this effect and what I should do to achieve the same
>
>> image as with 5.2.0?
>
>>
>
>>
>
>>
>
>> Thanks,
>
>>
>
>> Nick
>
>>
>
>>
>
>>
>
>>
>
>
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