[Qgis-user] About QgsGeometry::buffer

[lb]

Hi,

Buffer require some parameter since you can choose the "style" of 
buffer. You have some example on PostGis documentation (parameters are 
the same)
http://postgis.net/docs/ST_Buffer.html

QGis define this parameters in Settings->Options->Digitizing->Curve 
offset tool.

You can get this parameters via QSettings :
join = QSettings().value("Qgis/digitizing/offset_join_style", 0, type=int)
quad = QSettings().value("Qgis/digitizing/offset_quad_seg", 8, type=int)
endCap = quad
miter = QSettings().value("Qgis/digitizing/offset_miter_limit", 5, type=int)

Regards

l.bartoletti

Le 18/09/2015 23:12, Tudorache, Marian a écrit :
>
> Hi everyone,
>
> I would like to find more details about QgsGeometry::buffer with more 
> styles.
>
> In QGIS API Documentation there are two version of the buffer:
>
> Simple version with distance and segments and with sytles.
>
> The one with styles is defines as: ( distance, segments, endCapStyle, 
> joinStyle, mitreLimit );
>
> I do not understand the followings parameters:
>
> endCapStyle: Round (1) / Flat (2) / Square (3) end cap style
>
> joinStyle: Round (1) / Mitre (2) / Bevel (3) join style
>
> mitreLimit: Limit on the mitre ratio used for very sharp corners
>
> Does someone has some examples or recommend a book where to find more 
> details please?
>
> The QGIS API Documentation does not give me too much.
>
> Thanks,
>
> Marian
>
>
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