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<body text="#000000" bgcolor="#ffffff"><div><div style="font-family: Calibri,sans-serif; font-size: 11pt;">Members, I need help or guidance on how to calculate the polygon area, may be I'm doing is a wrong way.<br><br>I toggle edit tab i.e the pencil icon and i use vectors geometry tools to export/add geometry columns. But it gives me area as a decimal <br><br><br><br>For God and My Country<br>Consultant in: GIS,Forestry and Environment @ Earth Consult(U) Ltd.<br>CCRP GIS Support-Uganda<br>(The MCKNIGHT Foundation)<br><br>Rotarian at RC. Bweyogerere Namboole<br>Mob: 0772/0752-841118<br>Sent from Lumia Windows phone </div></div><div dir="ltr"><hr><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">From: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;"><a href="mailto:blaurent@heurisis.eu">Benoît Laurent</a></span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">Sent: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;">23/06/2015 12:05</span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">To: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;"><a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a></span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">Subject: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;">Re: [Qgis-user] Transparency for vector symbol layers</span><br><br></div>
Hello Andreas,<br>
<br>
Thank you very much for your complete answer.<br>
<br>
Actually, I reached my goal using rule based renderers.<br>
<br>
Regards,<br>
<br>
Benoît<br>
<br>
<blockquote cite="mid:55857258.5040108@carto.net" type="cite">Hi
Benoit,
<br>
<br>
It depends. Yes - you can mix transparent and opaque features. For
each color you can also set the opacity/transparency value.
<br>
<br>
However, if two features overlap and you use transparency on the
feature level, you can see the features shine through - whereas
when the transparency would be on the symbol level (which isn't
implemented yet in QGIS) you would first composite all elements in
a symbol level and then apply the opacity on the whole group. See
<a class="moz-txt-link-freetext" href="http://www.w3.org/TR/2011/REC-SVG11-20110816/masking.html#ObjectAndGroupOpacityProperties">http://www.w3.org/TR/2011/REC-SVG11-20110816/masking.html#ObjectAndGroupOpacityProperties</a>
for the difference. In
<a class="moz-txt-link-freetext" href="http://www.w3.org/TR/2011/REC-SVG11-20110816/images/masking/opacity01.png">http://www.w3.org/TR/2011/REC-SVG11-20110816/images/masking/opacity01.png</a>
- if you look at the bottom row of circles - the second pair of
circles has the opacity on the group of two circles, whereas the
third pair has opacity on every single element. I hope you can see
the difference.
<br>
<br>
It would be very cool if QGIS could have a more fine-grained
opacity - new opacity on symbol level and new opacity on a whole
group of layers. It would make the cartographic options even
better ;-)
<br>
<br>
Andreas
<br>
<br>
On 19.06.2015 16:40, Benoît Laurent wrote:
<br>
<blockquote type="cite">Hello,
<br>
<br>
I noticed this feature request :
<a class="moz-txt-link-freetext" href="https://hub.qgis.org/issues/3438">https://hub.qgis.org/issues/3438</a>.
<br>
<br>
Is it possible to have semi-transparent and opaque features
within the same layer ?
<br>
<br>
Best regards,
<br>
<br>
Benoît
<br>
<br>
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