[Qgis-user] Dynamic Line

[L.W.]

Does it works on Layers with no geometry?

My layers do not have a geometry.


Am 13.11.2020 um 11:56 schrieb Andreas Neumann:
>
> Yes, you need point data to start from, but then vectors can bei/are
> generated from the attributes you mentioned.
>
> Andreas
>
> Am 13.11.20 um 11:47 schrieb L.W.:
>>
>> from the docs ...
>>
>> ****It can only be used to render point data****
>>
>>
>>         12.2.2.2.6.The Vector Field Marker
>>         <https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?#id15>
>>
>> The vector field marker is used to display vector field data such as
>> earth deformation, tidal flows, and the like. It displays the vectors
>> as lines (preferably arrows) that are scaled and oriented according
>> to selected attributes of data points. ****It can only be used to
>> render point data****; line and polygon layers are not drawn by this
>> symbology.
>>
>> The vector field is defined by attributes in the data, which can
>> represent the field either by:
>>
>>  *
>>
>>     *cartesian*components (|x|and|y|components of the field)
>>
>>  *
>>
>>     or*polar*coordinates: in this case, attributes
>>     define|Length|and|Angle|. The angle may be measured either
>>     clockwise from north, or Counterclockwise from east, and may be
>>     either in degrees or radians.
>>
>>  *
>>
>>     or as*height only*data, which displays a vertical arrow scaled
>>     using an attribute of the data. This is appropriate for
>>     displaying the vertical component of deformation, for example.
>>
>> The magnitude of field
>>
>>
>> Am 13.11.2020 um 11:34 schrieb Andreas Neumann:
>>> Or even easier: use the "Vector Field Marker":
>>>
>>> https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?#the-vector-field-marker
>>>
>>>
>>> Am 13.11.20 um 11:33 schrieb Andreas Neumann:
>>>> Hi,
>>>>
>>>> Yes - you can use Geometry Generators for that. Use the
>>>> make_point() and make_line() expressions for that.
>>>>
>>>> See
>>>> https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?highlight=geometry%20generator#the-geometry-generator
>>>>
>>>> Greetings,
>>>> Andreas
>>>>
>>>> Am 13.11.20 um 11:26 schrieb L.W.:
>>>>> Hi,
>>>>>
>>>>> is it possible to draw automatically a line between two points
>>>>> defined
>>>>> by 4 fields (x1,y1 - x2,y2) in an attributetable?
>>>>>
>>>>> but I do not want to add a line-layer based on this table nor want to
>>>>> draw the line by hand.
>>>>>
>>>>> thanks
>>>>>
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