[mapserver-users] Angle Follow will accept only simple linestring don't MultiLinestring ?
Andrea Peri
aperi2007 at gmail.com
Wed Aug 14 00:37:05 PDT 2013
Hi,
My theory is not true.
I was able to create a featureset that like my image that will work when
the visible box clip it creating a multilinestring..
sorry for noise,
My quest still go on.
Regards,
2013/8/13 Andrea Peri <aperi2007 at gmail.com>
> Hi,
> Perhaps I found the explanation.
>
> The "angle follow" with OGR is using the
> BufferBuilder::bufferLineSingleSided
> That function seem don't work with a MultiLinestring . It necessary need a
> simple linestring.
>
> The question is that sometime the simple linestirng when is clipped from
> the visible bbox of the map to render, is transformed in a MultiLinestring.
> As showed in attached image.
>
> So a linestring geometry clipped by the visible bbox will become a
> multilinestring geometry and the bufferLineSingleSided will give error to
> put a "follow angle".
>
> Andrea.
>
> 2013/8/13 Andrea Peri <aperi2007 at gmail.com>
>
>> ok, thx.
>> I change to multiple scale.
>>
>> However I do a rapid check removing a label component, but the problem is
>> still here.
>>
>> Now I rewrite a more exact mapfile using two classes.
>>
>> Andrea.
>>
>>
>>
>>
>> 2013/8/13 thomas bonfort <thomas.bonfort at gmail.com>
>>
>>> yes, that's incompatible. use multiple scale-dependant classes for now
>>>
>>> On 13 August 2013 18:26, Andrea Peri <aperi2007 at gmail.com> wrote:
>>> > The two label are at different max/min scaledenominator.
>>> > The goal is to have little label size at low scales and bigger font
>>> size at
>>> > bigger scales.
>>> >
>>> > However only one lable is active at one scale level.
>>> >
>>> > Is this incompatible with "follow" ?
>>> >
>>> >
>>> >
>>> > 2013/8/13 thomas bonfort <thomas.bonfort at gmail.com>
>>> >>
>>> >> why the double label? they seem to be the same, but in any case
>>> >> multiple labels are not supported for FOLLOW.
>>> >>
>>> >> On 13 August 2013 18:08, Andrea Peri <aperi2007 at gmail.com> wrote:
>>> >> > I'm using spatialite 4.1.1,
>>> >> > so use ogr to access the db.
>>> >> >
>>> >> > LAYER
>>> >> > NAME "rt_topogr.50k.etichette.topon_idro_50k"
>>> >> > STATUS OFF
>>> >> > EXTENT 1554750.74 4678325.52 1771722.76 4924791.90
>>> >> > TYPE LINE
>>> >> > CONNECTIONTYPE OGR
>>> >> > CONNECTION "/path-to-spatialite/zz_topografica.sqlite"
>>> >> > DATA "select PK_UID_2, TOPO_OK, GEOMETRY from topon_idro_50k"
>>> >> > PROJECTION
>>> >> > "+init=epsg:3003 +towgs84=0,0,0,0,0,0,0"
>>> >> > END
>>> >> > METADATA
>>> >> > "wms_title" "topon_idro_50k"
>>> >> > "wms_extent" "1554750.74 4678325.52 1771722.76 4924791.90"
>>> >> > END
>>> >> > LABELCACHE ON
>>> >> > MAXSCALEDENOM 60100
>>> >> > MINSCALEDENOM 1
>>> >> > CLASS
>>> >> > NAME ''
>>> >> > MAXSCALEDENOM 60100
>>> >> > MINSCALEDENOM 1
>>> >> > LABEL
>>> >> > TEXT '[TOPO_OK]'
>>> >> > COLOR 0 85 255
>>> >> > OUTLINECOLOR 212 255 255
>>> >> > OUTLINEWIDTH 1
>>> >> > MAXSCALEDENOM 60100
>>> >> > MINSCALEDENOM 40100
>>> >> > FONT "LiberationSans-Regular"
>>> >> > TYPE truetype
>>> >> > SIZE 7
>>> >> > ANGLE FOLLOW
>>> >> > OFFSET 15 99
>>> >> > POSITION auto
>>> >> > PRIORITY 10
>>> >> > MAXOVERLAPANGLE 180.0
>>> >> > BUFFER 1
>>> >> > FORCE OFF
>>> >> > PARTIALS FALSE
>>> >> > MINDISTANCE 200
>>> >> > END
>>> >> > LABEL
>>> >> > TEXT '[TOPO_OK]'
>>> >> > COLOR 0 85 255
>>> >> > OUTLINECOLOR 212 255 255
>>> >> > OUTLINEWIDTH 1
>>> >> > MAXSCALEDENOM 40100
>>> >> > MINSCALEDENOM 1
>>> >> > FONT "LiberationSans-Regular"
>>> >> > TYPE truetype
>>> >> > SIZE 9
>>> >> > ANGLE FOLLOW
>>> >> > OFFSET 15 99
>>> >> > POSITION auto
>>> >> > PRIORITY 10
>>> >> > MAXOVERLAPANGLE 180.0
>>> >> > BUFFER 1
>>> >> > FORCE OFF
>>> >> > PARTIALS FALSE
>>> >> > MINDISTANCE 200
>>> >> > END
>>> >> > END
>>> >> > END
>>> >> >
>>> >> >
>>> >> >
>>> >> >
>>> >> > 2013/8/13 thomas bonfort <thomas.bonfort at gmail.com>
>>> >> >>
>>> >> >> there's something strange in your error message... the
>>> >> >> singleSidedBuffer stuff is in GEOS, and should have nothing to do
>>> in
>>> >> >> msOGRFileNextShape. post your whole mapfile layer.
>>> >> >>
>>> >> >> On 13 August 2013 17:42, Andrea Peri <aperi2007 at gmail.com> wrote:
>>> >> >> > Hi,
>>> >> >> >
>>> >> >> > I tested trasforming the multilinestring dataset in a linestring
>>> >> >> > dataset
>>> >> >> > but
>>> >> >> > the error is still here.
>>> >> >> >
>>> >> >> > msDrawMap(): Image handling error. Failed to draw layer named
>>> >> >> > 'rt_topogr.50k.etichette.topon_idro_50k'.
>>> >> >> >
>>> >> >> > msOGRFileNextShape(): OGR error. IllegalArgumentException:
>>> >> >> > BufferBuilder::bufferLineSingleSided only accept linestrings
>>> >> >> >
>>> >> >> > So it is not really due to a multilinestring vs linestring
>>> question.
>>> >> >> >
>>> >> >> > The quest carry on.
>>> >> >> >
>>> >> >> >
>>> >> >> >
>>> >> >> > 2013/8/13 Andrea Peri <aperi2007 at gmail.com>
>>> >> >> >>
>>> >> >> >> Hi,
>>> >> >> >>
>>> >> >> >> Try.ing to set a label on a MULTILINESTRING dataset.
>>> >> >> >>
>>> >> >> >> I set a label with Follow capability.
>>> >> >> >>
>>> >> >> >> ANGLE FOLLOW
>>> >> >> >>
>>> >> >> >> But I'm having this error:
>>> >> >> >>
>>> >> >> >> msOGRFileNextShape(): OGR error. IllegalArgumentException:
>>> >> >> >> BufferBuilder::bufferLineSingleSided only accept linestrings
>>> >> >> >>
>>> >> >> >> Is the Follow compatible with a MultiLinestring dataset or need
>>> only
>>> >> >> >> simple linestrings ?
>>> >> >> >>
>>> >> >> >> Thx,
>>> >> >> >>
>>> >> >> >> --
>>> >> >> >> -----------------
>>> >> >> >> Andrea Peri
>>> >> >> >> . . . . . . . . .
>>> >> >> >> qwerty àèìòù
>>> >> >> >> -----------------
>>> >> >> >
>>> >> >> >
>>> >> >> >
>>> >> >> >
>>> >> >> > --
>>> >> >> > -----------------
>>> >> >> > Andrea Peri
>>> >> >> > . . . . . . . . .
>>> >> >> > qwerty àèìòù
>>> >> >> > -----------------
>>> >> >> >
>>> >> >> > _______________________________________________
>>> >> >> > mapserver-users mailing list
>>> >> >> > mapserver-users at lists.osgeo.org
>>> >> >> > http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>> >> >> >
>>> >> >
>>> >> >
>>> >> >
>>> >> >
>>> >> > --
>>> >> > -----------------
>>> >> > Andrea Peri
>>> >> > . . . . . . . . .
>>> >> > qwerty àèìòù
>>> >> > -----------------
>>> >
>>> >
>>> >
>>> >
>>> > --
>>> > -----------------
>>> > Andrea Peri
>>> > . . . . . . . . .
>>> > qwerty àèìòù
>>> > -----------------
>>>
>>
>>
>>
>> --
>> -----------------
>> Andrea Peri
>> . . . . . . . . .
>> qwerty àèìòù
>> -----------------
>>
>
>
>
> --
> -----------------
> Andrea Peri
> . . . . . . . . .
> qwerty àèìòù
> -----------------
>
--
-----------------
Andrea Peri
. . . . . . . . .
qwerty àèìòù
-----------------
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