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Hi,<br>
<br>
Buffer require some parameter since you can choose the "style" of
buffer. You have some example on PostGis documentation (parameters
are the same)<br>
<a class="moz-txt-link-freetext"
href="http://postgis.net/docs/ST_Buffer.html">http://postgis.net/docs/ST_Buffer.html</a><br>
<br>
QGis define this parameters in
Settings->Options->Digitizing->Curve offset tool.<br>
<br>
You can get this parameters via QSettings :<br>
join = QSettings().value("Qgis/digitizing/offset_join_style", 0,
type=int)<br>
quad = QSettings().value("Qgis/digitizing/offset_quad_seg", 8,
type=int)<br>
endCap = quad<br>
miter = QSettings().value("Qgis/digitizing/offset_miter_limit", 5,
type=int)<br>
<br>
Regards<br>
<br>
l.bartoletti<br>
<br>
<div class="moz-cite-prefix">Le 18/09/2015 23:12, Tudorache, Marian
a écrit :<br>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
would like to find more details about QgsGeometry::buffer
with more styles.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">In
QGIS API Documentation there are two version of the buffer:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Simple
version with distance and segments and with sytles.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The
one with styles is defines as: ( distance, segments,
endCapStyle, joinStyle, mitreLimit );<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
do not understand the followings parameters:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">endCapStyle:
Round (1) / Flat (2) / Square (3) end cap style
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">joinStyle:
Round (1) / Mitre (2) / Bevel (3) join style
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">mitreLimit:
Limit on the mitre ratio used for very sharp corners<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Does
someone has some examples or recommend a book where to find
more details please?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The
QGIS API Documentation does not give me too much.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Marian<o:p></o:p></span></p>
</div>
<br>
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