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

[Andreas Neumann]

The situation of the two concentric simple markers is even a bit
weirder: if you pan/zoom in the map canvas multiple times, the
misalignment changes constantly, the misalignment is off by maybe 1
pixel in random directions. Really strange ... 

It almost looks there is a "precision issue" by 1-2 Pixels ... 

Andreas 

On 2020-07-03 16:27, Andreas Neumann wrote:

> Hi, 
> 
> Here is something that bothered me already for many years in QGIS and I think it might be a long standing issue in QGIS symbology: 
> 
> When you place two simple markers on top of each other (without any offset), f.e. two circle symbols on top of each other, they are not correctly aligned/centered on top of each other: The alignment is a tiny bit off, but it looks ugly and it annoys me a lot. 
> 
> The misalignment is not only in the preview dialogue but also visible in the map rendering. 
> 
> In the symbol preview dialog there is a second annoying thing: strokes in the preview are often clipped away, as you can see in the dialog above 
> 
> Can we do something about it these two annoying issues? 
> 
> Thanks for helping me solve this issue! 
> 
> Andreas 
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