[mapserver-users] Rendering of Symbols outside map window

Wed Feb 17 09:01:54 PST 2016

My memory is lousy I guess. Expanding the search rect used based on style sizes and to account for the use case Thomas mentions seems logical to me (more efficient), that or a gutter (probably easier). Needs a small RFC IMHO as I’m sure there would be side effects.

In terms of what might be done immediately in Patrick’s case.

-          I wonder if using CIRCLE shapes might work. A circle must be defined by a minimum bounding rectangle. That is, two points that define the smallest square that can contain it. These two points are the two opposite corners of said box. Since the which shapes function operates on bounding boxes it should identify any of the circles that intersect the map extent.

-          Issues like this are also handled correctly with tiling (mapcache) if I’m not mistaken – and you can define a metatile gutter. Maybe that could be used. You could set up tiling and then make arbitrary WMS calls against mapcache if you had to, or even just use the tiles directly.

-          Go the PostGIS route as suggested by Ambrogio…

Steve

From: deduikertjes [mailto:deduikertjes at xs4all.nl]
Sent: Tuesday, February 16, 2016 1:44 AM
To: thomas bonfort <thomas.bonfort at gmail.com>; Lime, Steve D (MNIT) <Steve.Lime at state.mn.us>
Cc: Patrick Meis <Meis at stadt-muenster.de>; mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Rendering of Symbols outside map window

>>>That's something we may want to fix.

If I remember correctly, Mapserver in  tile mode draws a slightly larger tile and crops that one (something configurable with GUTTER or so). I wrote my the code in my pull request along the same principle.
Adjusting the query extent when doing whichshapes() and account for the size of symbols when adjusting  the clipping rectangle once the feature is obtained might be more efficient?

But maybe this discussion shoud be done in mapserver-dev?

MArco

On 15-02-16 21:23, thomas bonfort wrote:
Steve,
IIRC, we account for the size of symbols when adjusting our clipping rectangle once we have obtained a feature, but we do not adjust the query extent when doing whichshapes(). That's something we may want to fix.
Another use-case would also be when the DATA statement does something like "ST_Buffer(the_geom,...) as the geom"

--
thomas

On 15 February 2016 at 17:44, Lime, Steve D (MNIT) <Steve.Lime at state.mn.us<mailto:Steve.Lime at state.mn.us>> wrote:
I know. We use to account for that explicitly.

________________________________
From: deduikertjes [deduikertjes at xs4all.nl<mailto:deduikertjes at xs4all.nl>]
Sent: Monday, February 15, 2016 2:44 AM
To: Lime, Steve D (MNIT); Patrick Meis

Cc: mapserver-users at lists.osgeo.org<mailto:mapserver-users at lists.osgeo.org>
Subject: Re: [mapserver-users] Rendering of Symbols outside map window

Steve,

I think the key part in the question is here:
" and the center point of the symbol is no longer inside the map window".
To my experience a symbol doesn't get drawn at all when the point which is symbolized is outside the requested extent (WMS mode at least).

To solve that I created the mentioned pull request.

Or do I miss something?

MArco

On 13-02-16 00:17, Lime, Steve D (MNIT) wrote:
This should already be happening. The drawing code traverses a layer's class/styles to commute a selection and clipping rectangle that is larger than the map extent.

________________________________
From: mapserver-users [mapserver-users-bounces at lists.osgeo.org<mailto:mapserver-users-bounces at lists.osgeo.org>] on behalf of mdprive [deduikertjes at xs4all.nl<mailto:deduikertjes at xs4all.nl>]
Sent: Friday, February 12, 2016 4:15 PM
To: Patrick Meis
Cc: mapserver-users at lists.osgeo.org<mailto:mapserver-users at lists.osgeo.org>
Subject: Re: [mapserver-users] Rendering of Symbols outside map window
Hi Patrick,

i've submitted a pull request for extending the map by a buffer and then clipping it, so that partial symbols on the edge get rendered as well (wms non tiled mode).

maybe you can build from sources and use this patch to solve your problem.

marco

--

Op 11 feb. 2016 om 21:54 heeft Ambrogio Foletti <afoletti at gmail.com<mailto:afoletti at gmail.com>> het volgende geschreven:
Hello Patrick,

if you are using PostGIS as datasource, I would solve the problem by integrating a st_buffer in the DATA element itself ;) The added bonus is that you will get the attribute values from a GetFeatureInfo (if implemented) in the whole buffer zone.
If not, you can try to use tile mode, and add some metabuffer (see mapserver doc<http://mapserver.org/output/tile_mode.html>)

Cheers!
A. Foletti

2016-02-05 10:58 GMT+01:00 Patrick Meis <Meis at stadt-muenster.de<mailto:Meis at stadt-muenster.de>>:
Hallo,

i have stumbled on a problem.
I am simulating a buffering of point-data with the help of symbols, which I have set to
sizeunit = meters
size = 760

These rather big symbols disappear from my map when I zoom in and
the center point of the symbol is no longer inside the map window.
But a significant part of the symbol should still be displayed.

Is there any possibility of extending the rendered map, so that the symbols of my points
are still rendered even when they are outside my map window?

Greetz
Patrick

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