Hi Zoltan, Thanks a lot for your reply! The version i'm using is QGIS
2.4.0. I want to develop a desktop application using QGIS API, by C++ as i
said. It is not GPS, but the way it is displayed like GPS-dynamic displaying by
the changing data. So i built QGIS using source code according to INSTALL. At
the time of Cmake, I unchecked the Python related plugins(such as
WITH_BINDINGS,WITH_STAGED_PLUGINS), hope this does not affact the function you
mentioned. Do you know which function or class is the one i'm looking for?
I developed a simple demo that has these features: add layer, zoom in/out, pan.
When i added a vector layer(.shp), i zoom in or zoom out, the refresh is not
smooth or continuous. Are there any places i did not do right? Looking forward
to your reply.
RegardsBob
Date: Mon, 11 Aug 2014 08:15:07 +0200
From: [email protected]
To: [email protected]
Subject: Re: [Qgis-developer] Is QGIS supports dynamic display?
On 2014/08/11 04:11, 腾飞 牛 wrote:
Dear all,
I'm
a new developer of QGIS using C++. I am doing a project which
needs dynamically displaying maps/layers(just like GPS,layers
automatically refreshing with the changing of object's
position).I kown ARCGIS has the technique called dynamic
diasplay(or something like that),which supports the capacity
to do such things. Is QGIS has this ability? Any advices would
be appreciated!
Regards
Bob
Hi Bob,
QGIS can definitely do this already.
I used this feature in November last year - but make sure you use
the latest versions of QGIS of all the plugins for field editing
because at that stage some of the (digitising, I think) plugins
caused serious loops when refreshing the screen or adding a feature,
so not great if you are dynamically panning.
I used a Garmin 60CSX, but any gps that can output an NMEA stream
should work.
You also need the free versions of Franson GPSGate from
http://gpsgate.com/
On a practical note, I found dynamic panning not very useful for my
purpose. When we drove passed a POI, we couldn't easily pause the
panning in order to drop a points and add the attributes needed. We
found the dynamic tracking (digitising) of the incoming GPS track
very useful, and we manually panned the display as needed, whilst in
motion.
HTH,
Zoltan
--
===========================================
Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
GIS and Photogrammetric Services
P.O. Box 7, Muizenberg 7950, South Africa.
Mobile: +27-83-6004028
Fax: +27-86-6115323 www.geograph.co.za
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