[Qgis-developer] Z or M styling in QGIS

[Régis Haubourg]

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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