[Qgis-developer] Z or M styling in QGIS

[Régis Haubourg]

First PR for sharing style here:
https://github.com/qgis/QGIS-Resources/pull/6


2017-01-03 11:49 GMT+01:00 Régis Haubourg <regis.haubourg at gmail.com>:

> Oups sorry, I should have checked before. Centralizerd ressource is here
> https://github.com/qgis/QGIS-Resources/tree/master/collections
>
>
> 2017-01-03 11:48 GMT+01:00 Régis Haubourg <regis.haubourg at gmail.com>:
>
>> Yep, qgis ressource sharing + a blog post (I have a bunch of them to
>> write on many topics) is the way to go .
>> About ressource sharing, do we have a centralized repo somewhere. I
>>  don't want to create one for only a few styles..
>>
>>
>> 2017-01-03 11:40 GMT+01:00 kimaidou <kimaidou at gmail.com>:
>>
>>> Hi all
>>>
>>> This is indeed awesome !
>>> Régis, you really should pass this kind of snippet to a broad audience
>>> (if you have time, of course). I do not know if the new QGIS sharing tool
>>> is the right target, or a quick blog post ?
>>>
>>> Cheers,
>>> Michaël
>>>
>>> 2017-01-03 11:31 GMT+01:00 Régis Haubourg <regis.haubourg at gmail.com>:
>>>
>>>>
>>>>
>>>> 2017-01-03 5:44 GMT+01:00 Nyall Dawson <nyall.dawson at gmail.com>:
>>>>
>>>>>
>>>>>
>>>>> I'd say the preferred solution would be a 3d viewer using the Qt 3d
>>>>> framework (http://doc.qt.io/qt-5/qt3d-examples.html). Then it could be
>>>>> built in as core functionality instead of as a python plugin (or
>>>>> relying on a js framework). We'd gain lots of benefits to this
>>>>> approach, including:
>>>>> - could be used with a multi-canvas view, with a mix of 2d/3d views
>>>>> - could potentially reuse existing symbology as surface materials
>>>>> - could do nifty things like embedding an interactive 3d view in a
>>>>> composer
>>>>> - could potentially replace the globe plugin
>>>>
>>>>
>>>> Yes I forgot to mention Qt3D. That would be good to know if someone has
>>>> already played with it.
>>>>
>>>>
>>>>
>>>>> So something like:
>>>>> z(point_n($geometry, at geometry_point_num))
>>>>
>>>>
>>>> Thanks for the pointer, That works with that expression on a Marker
>>>> Line easily to draw vertical edges. See the screenshot here
>>>> http://imgur.com/RPtOjMg
>>>>
>>>>
>>>>
>>>>>
>>>>
>>>> Throw that inside some type of data defined override and you can style
>>>>> a geometry's nodes based on their z value.
>>>>>
>>>>> A geometry generator using  segments_to_lines and geometry_n can style
>>>>> a geometries segments based on their z/m values too.
>>>>>
>>>>
>>>> Wow I just realized that you can combine a geometry generator inside a
>>>> marker line. Win!!!
>>>>
>>>> I used that expression, creating a line for each marker with a y
>>>> translation using z value:
>>>>
>>>> make_line( translate(point_n(  $geometry,  @geometry_point_num ), 0 ,
>>>> -z(point_n($geometry, at geometry_point_num)) ), translate( point_n(
>>>>  $geometry,  @geometry_point_num +1  ), 0 , -z(point_n($geometry, at geometry_point_num+1))
>>>> ) )
>>>>
>>>> See http://imgur.com/TlCN7zf
>>>>
>>>>
>>>> and a video just to underline the immediate feedback when editing :)
>>>>
>>>> https://youtu.be/o_lAeKJhRkg
>>>>
>>>>
>>>>
>>>> Thanks again Nyall, QGIS always allows a lot more than we think. So
>>>> great....
>>>>
>>>>
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>>>
>>>
>>
>
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