[Qgis-developer] Fwd: [Qgis-user] regularly spaced address markers on alternating side of road

[Nyall Dawson]

On 29 June 2016 at 18:23, Neumann, Andreas <a.neumann at carto.net> wrote:
> On 2016-06-29 10:14, Neumann, Andreas wrote:
>
> Hi Nyall,
>
> For marker lines, with regularly spaced markers at a given interval, I'd
> like to have an index number - 1 to n for each feature.
>
> I mean - for each marker of the feature, starting at 1 at each new feature.

Ahh - I missed the marker line part. It's actually pretty trivial to
add as a new expression variable. Multi* geometries have
@geometry_part_num, so it'd be something pretty similar
(@marker_line_index?)

Nyall

>
>
>
>
>
> Or - for multi-geometries, it would also be useful to have the index number
> - the index nr of the nth ring or nth line in a multilinestring.
>
> I think, such an index/counter it should be per feature and not global.
>
> For linestring labeling it would also be interested to regularly place
> labels, with a counter/iterator and place the labels perpendicular to the
> tangent.
>
> We could collect some use cases for such indexes to get this into QGIS 3.x,
> if possible.
>
> Andreas
>
> On 2016-06-29 09:35, Nyall Dawson wrote:
>
> On 29 June 2016 at 17:01, Neumann, Andreas <a.neumann at carto.net> wrote:
>
>
> Hi,
>
> I am forwarding this interesting symbology / labeling problem to the
> dev-list, perhaps someone has an idea with the existing symbology options /
> geometry generators / expressions / some Python magic.
>
> See also http://lists.osgeo.org/pipermail/qgis-user/2016-June/036842.html
>
> What I am personally also interested in, is getting access to the index nr
> of a marker. If every marker knew  - I am the first, second, third, etc.
> marker, we could use it in expressions and add dynamic marker content and
> change properties based on the marker index.
>
>
> Do you mean within a multipoint? or across all features?
>
> Nyall
>
>
>
> Or, we could have per feature counters/iterators that either allow to
> calculate n marker or label positions on the fly.
>
> Something to consider for QGIS 3.0 ;-)
>
> Andreas
>
> -------- Original Message --------
>
> Subject: [Qgis-user] regularly spaced address markers on alternating side of
> road
> Date: 2016-06-29 07:11
> From: Dan Jacobson <jidanni at jidanni.org>
> To: qgis-user at lists.osgeo.org
>
>
>
> I want to label vectors (roads) with proposed addresses:
>
> 21  23  25  27  29
> ==================
>   22  24  26  28
>
> I suppose I will use the Qchainage plugin and then post-process the
> output with a simple perl script to get the exact labels I want (20, 30,
> 40...).
>
> I don't suppose I can make them on either side of the road so I suppose
> I will have to put them along the centerline.
>
> There are no houses here. Just guide points for government workers if
> houses were ever to be built.
>
> I can't use StackExchange to ask this because I don't have enough Karma
> and never will.
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