[Qgis-user] Symbol lines every km, moving when changing scale or moving map

[Andreas Neumann]

Hi Jérémie,

Do you have geometry simplification turned off? See "Settings" --> 
"Options" --> "Rendering" --> "Enable feature simplification ..."

Make sure this is deactivated (I think it is enabled by default).

Greetings,

Andreas

On 2021-02-19 11:05, Prud'homme Jérémie wrote:

> Tested too fast :(
> 
> Behavior is ok when zooming in, but still problems when zooming out 
> (whereas the entire feature is visible !).
> See here : https://www.zupimages.net/viewer.php?id=21/07/ehlo.gif
> 
> Circles should follow the strokes generated with the tool "Points along 
> geometry".
> 
> Jérémie.
> 
> Le ven. 19 févr. 2021 à 10:03, Prud'homme Jérémie <p.jeremie at gmail.com> 
> a écrit :
> 
> Hi,
> 
> Thank you very much Nyall, this one was pretty well hidden.
> 
> With clipping unchecked, behavior is as expected for my use case.
> 
> Jérémie.
> 
> Le jeu. 18 févr. 2021 à 23:29, Nyall Dawson <nyall.dawson at gmail.com> a 
> écrit : On Wed, 13 Jan 2021 at 06:33, Prud'homme Jérémie 
> <p.jeremie at gmail.com> wrote:
>> 
>> Hi,
>> 
>> I'm using QGIS 3.10.
>> 
>> I tried to use only symbology to display a stroke every km along a 
>> road.
>> The project CRS is 2154 (Lambert 93).
>> 
>> When adding a ""symbol line" with an interval of 1000 map units (meter 
>> for 2154) - or 1000 meters at scale, same result - I achieve to 
>> display symbols every km.
>> 
>> Problem is when I move the map or change scale, the symbols do not 
>> always stay in place. They are sometimes misplaced.
>> 
>> I've been told that problem can be that the first node of the line is 
>> not always the reference to calculate the intervals.
> 
> From the bottom of the symbol widget, click the "Advanced" button and
> uncheck "Clip features to canvas extent".
> 
> Nyall
> 
>> 
>> You can find a GIF here that displays my problem : 
>> https://zupimages.net/viewer.php?id=21/02/nvr2.gif
>> 
>> Circles are symbols via Symbology.
>> Strokes are symbos on points generated vith the tool "Points along 
>> geometry".
>> 
>> You can see that circles are not always at the same place as the 
>> strokes.
>> 
>> Is it a "normal" behavior ?
>> Anyway as a user I would expect that symbols are always generated at 
>> the same place from the starting node.
>> 
>> Thanks for your enlightments on this.
>> 
>> Jérémie.
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