[QGIS-Developer] Symbology: multiple simple marker symbols are not correctly aligned on top of each other

[Tim Sutton]

Hi

> On 5 Jul 2020, at 23:51, Nyall Dawson <nyall.dawson at gmail.com> wrote:
> 
> 
> I'm not sure there's anything we can do here. That said, one
> experiment I played with about a year ago was to upgrade the symbol
> preview picture to use a QgsMapCanvas widget. The symbol is then
> rendered using a geometry of suitable shape, and you can nicely
> interact with the preview including being able to zoom in and out of
> the preview (which makes it easy to verify that the multiple layers
> are indeed correctly centered). It also means that we can synchronize
> the scale and center of the symbol preview canvas widget with the main
> map canvas' scale and center, so that symbol sizes set to map units
> show exactly as they'll appear on the map.
> 
> If anyone's interested in playing, heres' the WIP commit:
> https://github.com/nyalldawson/QGIS/commit/db8364d989e8092c6db4ebc88deeb62cad4743d1 <https://github.com/nyalldawson/QGIS/commit/db8364d989e8092c6db4ebc88deeb62cad4743d1>
> . There's a good couple of hours left to go to get that over the
> finish line though.

Ah that would be a great improvement!

Regards

Tim

> 
> Nyall
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Tim Sutton

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