[mapserver-dev] Development of new functions "combine symbols"
and "displace symbols"
Olaf Knopp
olaf.knopp at wheregroup.com
Tue Jan 25 04:56:37 EST 2011
Hi Tamas,
thanks for you reply. Please check my answers below:
Combine Symbols:
1. I would prefer a centroid.
2. I think it should be possible to click on the combined symbol and get
a featureInfo of all combined objects. Perhaps this is not useful if you
have many symbols. What do you think?
3. For the moment we only need point layers.
Displace Symbols:
1. It should be possible to configure each layer (PRIORITY, DISTANCE of
the relocation and a displace ANGLE) to avoid the relocated symbols
cover each other.
2. Yes this is a problem. I think we can't solve it, because it could
create a "cascade" in the mapfile with every symbol relocated. Perhaps
we should limit the function only to objects with the same coordinates.
You will then have to configure the mapfile and layers to provide the
best map design.
3. This could be a nice option. Perhaps with something like "ARROW
YES/NO" and a line symbol configured for the arrow. For our project it
is not necessary.
4. For the moment we only need point layers.
values of COMBINEUNITS and DISPLACEUNITS?: I think it would be best to
use the options that are mostly availible in MapServer:
[pixels|feet|inches|kilometers|meters|miles|nauticalmiles], but to make
the configurement easy pixels is the option of choice, because you can
"play" with symbolsize and the displacedistance.
By the way. Do you know how this would work? Do we have to give a
concept to the steering commitee e.g. for the options like
"COMBINEUNITS, DISPLACEUNITS, COMBINESYMBOLS" etc? Do you commit to the
MapServer trunk?
Greetings
Olaf
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********************************************
-----------------------------------
WhereGroup GmbH& Co. KG
Eifelstraße 7
53119 Bonn
Germany
Olaf Knopp
Geschäftsführer
Fon: +49 (0)228 / 90 90 38 - 27
Fax: +49 (0)228 / 90 90 38 - 11
info at wheregroup.com
www.wheregroup.com
Amtsgericht Bonn, HRA 6788
-----------------------------------
Komplementärin:
WhereGroup Verwaltungs GmbH
vertreten durch:
Olaf Knopp, Peter Stamm
-----------------------------------
Am 24.01.11 23:12, schrieb Tamas Szekeres:
> Hi Olaf,
>
> The idea looks compelling to me, however I would have some further
> questions before trying to propose a reasonable approach to this feature:
>
> Combine Symbols:
> 1. What would be the position of the combined feature? Would this be
> one of the features have been combined or some other location (like
> the centroid of the features)?
> 2. What did you mean by 'not to lose the FeatureInfo'? Does it mean
> that the invidual features should be retrieved from a 'query by point
> option' and not the combined feature?
> 3. Would this option affect only the point layers (with marker
> symbols) or some other types as well? (like annotations)
>
> Displace Symbols:
> 1. How the position of the relocated symbols should be calculated?
> Would this be a constant vector assigned to each layer/class?
> 2. What should be happened when a relocated symbols would overlap with
> some other symbols because of the relocation?
> 3. Shouldn't the relocation be displayed somehow? (ie. by using a line
> or arrow along with the symbol)
> 4. What type of layers would be affected? (points only?)
>
> Assuming the distance threshold is specified in screen coordinates,
> what would be the possible values of COMBINEUNITS and DISPLACEUNITS?
>
>
> Best regards,
>
> Tamas
>
>
>
>
> 2011/1/24 Olaf Knopp <olaf.knopp at wheregroup.com
> <mailto:olaf.knopp at wheregroup.com>>
>
> Hello everybody,
>
> for a project we need some software development to be done. We
> think these new features will become more important to provide
> modern and elegant maps and therefore would be a great add-on for
> MapServer. As working titles we call these functions "combine
> symbols" and "displace symbols".
> Here follows a rough concept for the functions.
>
> 1. Combine symbols
> This function combines symbols of the same layer (or class) to one
> symbol containing the number of combined symbols if viewed in a
> certain scale.
> For this you have to mark a layer/class e.g. by "COMBINESYMBOLS
> TRUE", give a distance between the symbols (COMBINEDISTANCE xy,
> COMBINEUNITS …), perhaps a MAXCOUNT etc. You will also have to
> define a symbol and the label for the combination. It would be
> best no to lose the FeatureInfo and get a list of templates after
> clicking on the combined symbol. You will find a nice example of
> combined symbols here: http://www.verbeterdebuurt.nl/ (zoom to the
> Netherlands).
> By configuring a zoom range (e.g. COMBINEMAXSCALEDENOM,
> COMBINEMINSCALEDENOM) you define in which scales the symbols
> should be combined.
>
> 2. Displace Symbols
> This function should relocate symbols of objects with same or
> similar coordinates so they don't conceal each other or overlap.
> For this you have to mark the mapfile e.g. by "DISPLACESYMBOLS
> YES" and give a distance between symbols that should be displaced
> (DISPLACEDISTANCE xy, DISPLACEUNITS …). Then you have to configure
> every layer similar to a label by giving a priority, a displace
> distance and an displace angle.
> You will also have to give a zoom range similar to the combine
> function described above. FeatureInfo should still work by
> clicking on the moved symbols.
>
> Who can develop this functions until the end of February? Is there
> anybody else interested in these functions?
> Please conctact us to discuss further details and to calculate a
> proposal.
>
> Greetings
> Olaf Knopp
>
> --
> ********************************************
> Die WhereGroup ist umgezogen ...
>
> Seit dem 01.01.2011 lautet unsere neue Adresse:
>
> WhereGroup GmbH& Co. KG
> Eifelstraße 7
> 53119 Bonn
>
> Alle Telefonnummern und eMail-Adressen
> bleiben unverändert.
> ********************************************
> -----------------------------------
> WhereGroup GmbH& Co. KG
> Eifelstraße 7
> 53119 Bonn
> Germany
>
> Olaf Knopp
> Geschäftsführer
>
> Fon: +49 (0)228 / 90 90 38 - 27
> Fax: +49 (0)228 / 90 90 38 - 11
>
> info at wheregroup.com <mailto:info at wheregroup.com>
> www.wheregroup.com <http://www.wheregroup.com>
> Amtsgericht Bonn, HRA 6788
> -----------------------------------
> Komplementärin:
> WhereGroup Verwaltungs GmbH
> vertreten durch:
> Olaf Knopp, Peter Stamm
> -----------------------------------
>
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