[GRASS-user] [GRASS-dev] QGIS GRASS Plugin Upgrade Crowdfunding

[Radim Blazek]

On Tue, Mar 24, 2015 at 5:31 PM, Daniel Victoria
<daniel.victoria at gmail.com> wrote:
> Hi Radim,
>
> Is this why my QGis crashes when i try to load a Grass 7.0 vector file? [1]

AFAIC, it should only crash if you try to open a GRASS mapset with
GRASS 6 vectors in QGIS browser compiled and run with GRASS 7
provider. It is described here:
http://lists.osgeo.org/pipermail/qgis-user/2015-March/031177.html

I think that I know already what the problem is. If GRASS 7 lib is
tries to open a vector which it is not in format 7, it calls
G_fatal_error(), which normally opens a warning dialog. Because items
in the browser are populated in threads, it happens on non GUI thread,
but to open a dialog with an icon, it has to use QIcon which can only
be used on GUI thread.


Radim


> Thanks
> Daniel
>
> [1] -
> http://gis.stackexchange.com/questions/138477/loading-grass-7-0-vectors-in-qgis-broken
>
> On Tue, Mar 24, 2015 at 11:47 AM, Vaclav Petras <wenzeslaus at gmail.com>
> wrote:
>>
>> On Tue, Mar 24, 2015 at 5:56 AM, Radim Blazek <radim.blazek at gmail.com>
>> wrote:
>>>
>>> >> Are there functions in time series implementation which need to be
>>> >> called directly from the plugin or everything may be done just calling
>>> >> t.rast.* modules?
>>> >
>>> > Most of the temporal functionality is available through the temporal
>>> > modules. However some important algorithms (temporal re-sampling) are
>>> > available only in the Python framework. This is needed for time series
>>> > animation creation. Using the framework directly will speed things up,
>>> > because the module calls, the parsing and interpretation of the module
>>> > outputs can be avoided.
>>>
>>> If it should be used for dynamic animation in QGIS canvas you could
>>> consider the possibility to subclass raster renderer in Python and
>>> insert it into raster layer pipe from Python plugin.
>>
>>
>> Speaking about animations, some things from GRASS GIS GUI could be perhaps
>> used directly in the same was as Tcl/Tk NVIZ is used in processing for GRASS
>> 6. Animation tool is one of them. This would be great since we would get al
>> least some functionality/code sharing between GRASS and QGIS GUIs which is
>> otherwise not possible due to Python/wxPython and C++/Qt (and would be only
>> possible if both things would be at least in the same language).
>>
>> This is of course not fulfilling the requirement to be general, i.e. work
>> with other data providers in QGIS, but surely some things just have to be
>> like that if they are using GRASS-specific formats (temporal data) or
>> algorithms (e.g. algorithms to work with temporal data, their topology,
>> ...).
>>
>> Vaclav
>>
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>
>