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 <aperi2...@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.bonf...@gmail.com> > >> yes, that's incompatible. use multiple scale-dependant classes for now >> >> On 13 August 2013 18:26, Andrea Peri <aperi2...@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.bonf...@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 <aperi2...@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.bonf...@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 <aperi2...@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 <aperi2...@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@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 -----------------
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