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

[Andreas Neumann]

Here is another example: 

square on top of a circle - you can clearly see that the rectangle would
have be shifted one pixel to the left and one pixel up to align better: 

Andreas 

On 2020-07-03 16:35, Andreas Neumann wrote:

> 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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