[Qgis-developer] Z or M styling in QGIS

Régis Haubourg regis.haubourg at gmail.com
Tue Jan 3 02:48:37 PST 2017


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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