[Qgis-user] Re: [Qgis-developer] announcing DPSimplify

[Richard Duivenvoorde]

Giovanni Manghi wrote:
> But it actually works?
> I tested it on a small line vector and in the best case qgis freezes.
>
> If the project is in wgs84 and the vector is not I get a crash (qgis
> 1.4, under linux)

I'm using trunk on linux here. And yes, it is working.

And trying both plugins on the same (multipolygon)  project, I see some 
differences and issues ...
- DPSimplify actually simplifies your data on the fly, and gives you the 
option to either save it to a new shapefile or not (nice !)
- DPSimplify also reports the number of vertices reduced, which gives 
you the option to lower or higher your tolerance (nice)
- DPSimplify seems to  work only with line and polygons data (not multi* 
)? (at first there was no layer in the dropdown, untill I added a (non 
multi)polygon layer)
- DPSimplify the about-box raises an python exception here

Don't know when you add layers with a different projection to a map 
(like you do: the plugin has to do the 'on the fly projection' itself I 
think... this is a though case anyway)...

And to make myself clear: I do not want to discourage Alexander to 
develop the plugin!! Because if I'm correct, the current vector-menu 
stuff is actually cpp ported from the former python plugin as well.
I think the python plugins are a nice example and way for prototyping 
stuff to either (but not nessecarily) being ported to trunk, and 
hopefully raise interest for people to add functionality to qgis.

Regards,

Richard







> -----------------
> Warning: X Error: BadIDChoice (invalid resource ID chosen for this
> connection) 14
>   Major opcode: 1 (X_CreateWindow)
>   Resource id:  0x6a012cf
> Warning: X Error: BadIDChoice (invalid resource ID chosen for this
> connection) 14
>   Extension:    153 (RENDER)
>   Minor opcode: 4 (RenderCreatePicture)
>   Resource id:  0x6a012d0
> qgis.bin: ../../src/xcb_io.c:242: process_responses: Assertion `(((long)
> (dpy->last_request_read) - (long) (dpy->request)) <= 0)' failed.
> Aborted
> -----------------
> 
> 
> this is one of the few (more) problems I found recently in the "vector"
> toolbox so I'm about to open new tickets (there are already a few in the
> trac). There is someone that plans, maybe at the hackfest, to solve this
> issues?