[gdal-dev] styles .ofs and OGR_STBL_GetNextStyle()

[Chaitanya kumar CH]

Nik,

This is a good idea. The doc you specified needs a correction. The
version string and style field lines are supposed to be commented out
with a #.

The OGRStyleTable class has methods to save and load style tables.
They assume neither empty lines nor comments.
There is one method to Print that saves the styletable into a file in
the .ofs format. We can implement a method that loads a styletable
from such file. Do you have any other suggestions?

I suggest you create a ticket on this at http://trac.osgeo.org/gdal/#BugTracking


On Wed, Jul 30, 2014 at 10:17 AM, Nik Sands <nixanz at nixanz.com> wrote:
> Hi Devs,
>
> I'm just planning to convert my own 'in-house' drawing styles management to using the styles management built into OGR.  The documentation at http://www.gdal.org/ogr_feature_style.html suggests that styles can be in a '.ofs' file to be automatically associated with a data source of the same name as the .ofs file.
>
> But how about if the .ofs file is a stand-alone file passed directly to OGR_STBL_LoadStyleTable()?  Eg, OGR_STBL_LoadStyleTable(table, "/path/to/styles.ofs")
>
> In this case the first two calls to 'OGR_STBL_GetNextStyle(table)' will return the 'styles':
>
> OFS-Version :  1.0
> 2014-07-30 14:38:36.392 Maps n Trax[47458:60b] StyleField :  "style"
>
> Which are of course not styles at all, but part of the .ofs specification.
>
> From this, I assume that files passed into OGR_STBL_LoadStyleTable() should in fact NOT be .ofs files, but merely plain text files with raw style strings only (and no .ofs specifications).
>
> Is this correct?
>
> Would there be any advantage on getting OGR_STBL_LoadStyleTable() to ignore the first line or two if it is an .ofs file and those two lines match the spec?
>
> Cheers,
> Nik.
>
>
> OFS-Version: 1.0
> StyleField: "style"
>
> DefaultStyle: SYMBOL(c:#000000,id:"ogr-sym-3",s:5pt); PEN(c:#000000,w:2pt); BRUSH(fc:#80808080); LABEL(c:#000000,s:14pt,t:{title})
>
> locality: LABEL(c:#000000,s:24pt,t:{title})
> town: SYMBOL(c:#800000,id:"ogr-sym-3",s:10pt); LABEL(c:#800000,s:24pt,t:{title})
> city: SYMBOL(c:#800000,id:"ogr-sym-3",s:15pt); LABEL(c:#800000,s:24pt,t:{title})
> region: PEN(c:#000000,w:2pt); BRUSH(fc:#80808080); LABEL(c:#000000,s:28pt,t:{title})
> country: PEN(c:#000000,w:2pt); BRUSH(fc:#80808080); LABEL(c:#000000,s:32pt,t:{title})
>
> vegetation_low: BRUSH(fc:#A0F0A0); LABEL(c:#004000,s:18pt,t:{title})
> vegetation_medium: BRUSH(fc:#80C080); LABEL(c:#004000,s:18pt,t:{title})
> vegetation_high: BRUSH(fc:#008000); LABEL(c:#004000,s:18pt,t:{title})
> water: SYMBOL(c:#000080,id:"ogr-sym-3",s:2pt); PEN(c:#000080,w:2pt,p:"18pt 8pt"); BRUSH(fc:#8080C0); LABEL(c:#000080,s:18pt,t:{title})
> contour: PEN(c:#808080,w:1pt); LABEL(c:#808080,s:12pt,t:{elevation})
>
> road_unsealed: PEN(c:#A08080,w:2pt,p:"10pt 6pt"); LABEL(c:#000000,s:18pt,t:{title})
> road_minor: PEN(c:#A08080,w:2pt); LABEL(c:#000000,s:18pt,t:{title})
> road_medium: PEN(c:#A00000,w:4pt); LABEL(c:#000000,s:18pt,t:{title})
> road_major: PEN(c:#A00000,w:6pt); LABEL(c:#000000,s:18pt,t:{title})
>
> route: PEN(c:#000000,w:2pt,p:"2pt 4pt"); LABEL(c:#000000,s:18pt,t:{title})
> track: PEN(c:#000000,w:2pt,p:"10pt 6pt"); LABEL(c:#000000,s:18pt,t:{title})
> rail: PEN(c:#000000,w:4pt,p:"2pt 5pt"); LABEL(c:#000000,s:18pt,t:{title})
> cable: PEN(c:#000000,w:2pt,p:"1pt 6pt"); LABEL(c:#000000,s:18pt,t:{title})
> ferry: PEN(c:#000080,w:2pt,p:"18pt 8pt"); LABEL(c:#000080,s:18pt,t:{title})
>
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-- 
Best regards,
Chaitanya kumar CH.

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