[mapserver-dev] Motion: change default POSITION AUTO labelling order for point layers

[thomas bonfort]

Steve,

Adding this at the global level would not be particularly difficult to
implement, we'd just need to read these positions at the beginning of
the labelcache phase. However, I believe that such a customization
should be done at the label level, as the need to override the
accepted "best" positioning order would only need to be applied on a
very specific label layer.

--
thomas

On Fri, Mar 16, 2012 at 20:34, Stephen Woodbridge
<woodbri at swoodbridge.com> wrote:
> I have no idea what it would take to do something like this, but what do you
> think about adding a CONFIG "USE_ALT_LABEL_POSITION_AUTO=yes" or something
> like this in the mapfile as a global switch to an alternate hardcoded list
> of positions. Then by default you get the current positioning or select this
> in the mapfile to get the new positioning order. Assuming that it is easy to
> grab these config values, it is just an if block to reset the order on
> startup. I'm not sure if "startup" implies, reading the mapfile, or CGI or
> FastCGI, or apache module startup. Hopefully it is easy to init when the
> mapfile is read.
>
> -Steve W
>
>
> On 3/16/2012 1:42 PM, thomas bonfort wrote:
>>
>> Patches graciously accepted :)
>> I personally have no incentive in implementing configurable positioning
>> as a hardcoded
>>
>> 6 1 5
>> 4 X 3
>> 8 2 7
>>
>> suits all my needs.
>>
>> --
>> thomas
>>
>> On Fri, Mar 16, 2012 at 16:30, Bob Basques <Bob.Basques at ci.stpaul.mn.us
>> <mailto:Bob.Basques at ci.stpaul.mn.us>> wrote:
>>
>>    All,
>>
>>
>>    I know my vote doesn't count as much.  But I'm thinking the same
>>    here with regard to changing things.  As an alternative to changing
>>    things, what's the timeline on just setting up the planned MAPFILE
>>    controls instead?
>>
>>
>>    bobb
>>
>>
>>
>>
>>     >>> Daniel Morissette <dmorissette at mapgears.com
>>    <mailto:dmorissette at mapgears.com>> wrote:
>>
>>    I'd say -0 ... I can see in ticket #4249 that the change of order gives
>>    better results in that case, but I am always hesitant to change a
>>    built-in behavior that has been around for years as this change could
>>    cause side-effects for other use cases where the current order is
>>    better. (I have no such use case in mind, just being overly careful
>>    because our users don't like when we break backwards compatibility.)
>>
>>    BTW, I love the idea of a mechanism to control the order in the
>> mapfile.
>>
>>    Daniel
>>
>>
>>
>>    On 12-03-16 10:19 AM, thomas bonfort wrote:
>>     > Hi devs,
>>     >
>>     > We have tickets 2981, 4242 and 4249 opened to ask for a change in
>> the
>>     > order which labels are placed around a label point, in order to
>>    obtain
>>     > better quality text placement.
>>     >
>>     > http://trac.osgeo.org/mapserver/ticket/2981
>>     > http://trac.osgeo.org/mapserver/ticket/4242
>>     > http://trac.osgeo.org/mapserver/ticket/4249
>>     >
>>     > While the long-term solution will allow us to configure this order
>> at
>>     > the mapfile level, I motion that we change this order from
>>     >
>>     >
>>     > 1 7 3
>>     > 6 X 5
>>     > 4 8 2
>>     >
>>     > to
>>     >
>>     > 6 1 5
>>     > 4 X 3
>>     > 8 2 7
>>     >
>>     > for the 6.2 release.
>>     > I'll start with my +1.
>>     >
>>     > regards,
>>     > thomas
>>     > _______________________________________________
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>>
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>>
>>
>>    --
>>    Daniel Morissette
>>    http://www.mapgears.com/
>>    Provider of Professional MapServer Support since 2000
>>
>>
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