I think the first approach would be better for existing
projects, as the reference diagram (specified in the layer
config dialog) would keep its original size.
Yes, I'm also in favor of the first approach. It is more intuitive to
set the size of the diameter than the one of the area.
Marco
Am 10.08.2012 09:07, schrieb Kuhn Matthias, Vermessung:
Oops, clicked the wrong button. Here for the list:
Hi Marco
Good thoughts. A dimension more really justifies exponential scaling.
For diagrams scaled by area, we should then use the specified
diameter for the given attribute value and scale other
diagrams according to this ratio.
The other possibility would be to indicate indicate squared units.
I think the first approach would be better for existing
projects, as the reference diagram (specified in the layer
config dialog) would keep its original size.
Whereas the second approach would lead to immediate resize in
existing projects but it would be more comprehensible for the
user that he is scaling by area.
--
Matthias Kuhn
-----Original Message-----
From: qgis-developer-boun...@lists.osgeo.org
[mailto:qgis-developer-boun...@lists.osgeo.org] On Behalf Of Marco
Hugentobler
Sent: Friday, August 10, 2012 8:04 AM
To: qgis-developer@lists.osgeo.org
Subject: Re: [Qgis-developer] Diagram improvements
Hi Matthias
In my opinion this is a bug in the current version and should be
changed without option
It will be good to have an additional option to scale
proportional to
the area. But I think you should leave the option to scale the
diameter.
This was done on purpose, because the diagram size you
specify is the
radius, not the area (and this again is similar to the symbology
system, where point symbol size is also diameter, not area). Btw, I
have read that there might also be cases where you want to scale
diagram sizes proportional to the volume (e.g. to display
content of
lakes, etc.).
Regards,
Marco
Am 09.08.2012 14:48, schrieb Kuhn Matthias, Vermessung:
Do you think circular diagrams (i.e. text and pie) need to
have an option to scale their radius instead of their area?
In my opinion this is a bug in the current version and
should be changed without option as it overexagerates
bigger values.
But maybe there is a reason to leave this choice to the user?
--
Matthias Kuhn
-----Original Message-----
From: qgis-developer-boun...@lists.osgeo.org
[mailto:qgis-developer-boun...@lists.osgeo.org] On Behalf
Of Matthias
Kuhn
Sent: Tuesday, August 07, 2012 5:37 PM
To: Qgis Developer List
Subject: [Qgis-developer] Diagram improvements
Hi,
I recently started an internship at Uster (a city in
Switzerland). My
job will mostly be to improve QGIS. I'm really looking
forward to
this great opportunity.
My first job is, to improve the diagrams. Any comments
are highly
appreciated. (If you think something can be done better
differently,
if you think something is useless, if you are already working on
something or you know about somebody already working on
something, if
you wanna say thank you...)
Here a short list of what I've got on my ToDo list.
- Minimum size for diagrams (As an option, scale any
diagram smaller
than...): Done
- Text diagram: Center text better vertically (As an
option): Done
- Charts are not placed on some polygons (e.g. banana
shaped polygons.
Should this be done with PAL library? Any help appreciated)
- Ordering: Draw smaller charts on top of bigger one instead of
hiding
(randomly?) colliding diagrams.
- Make diagrams area accurate! By now the radius instead
of area is
scaled.
- New diagram type: Bar chart
- New diagram option: Split diagrams. (Pie charts / Bar
charts e.g.
age
pyramid)
If you're interested in the current state of work, have a
look at my
git repo [0] on master. Where it says done in the list above you
should be able to check it out.
[0] https://github.com/matthias-kuhn/Quantum-GIS.git
Regards,
I'm looking forward for comments
Disclaimer: Sorry if you get this topic the second time.
I thought
I'd written something about it yesterday, but couldn't
find it in my
history nor in the archives, so I'll repeat myself and
just believe,
that I missed the send button when I tried to click it.
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--
Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions Weberstrasse 5,
CH-8004 Zürich, Switzerland marco.hugentob...@sourcepole.ch
http://www.sourcepole.ch Technical Advisor QGIS Project Steering
Committee
_______________________________________________
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Qgis-developer@lists.osgeo.org
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_______________________________________________
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Qgis-developer@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-developer
--
Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
marco.hugentob...@sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee
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