[QGIS-Developer] Issue with determining Symbol size - Bug?

[Nyall Dawson]

On Wed, 2 Sep 2020 at 03:39, C Hamilton <adenaculture at gmail.com> wrote:
>
> I am trying to calculate the size of a single symbol in pixels using:
>
> canvas = iface.mapCanvas()
> context = QgsRenderContext.fromMapSettings(canvas.mapSettings())
> layer = iface.activeLayer()
> rnd = layer.renderer()
> sym = rnd.symbol()
> scaled_size_in_pixels = context.convertToPainterUnits(
>     sym.size(),
>     sym.sizeUnit(),
>     sym.sizeMapUnitScale() )
>
> The last line can also be calculated by:
>
>   scaled_size_in_pixels = sym.size(context)
>
> I am finding that this is returning the size of the filled area of the symbol, but it does not include the border. Is this a bug or do I need to add something additional to include the border?

You can use  QgsSymbolLayerUtils::estimateMaxSymbolBleed if you're
wanting to calculate the "maximum" bounding box of a rendered symbol.
That includes any stroke/offset/other settings which also affect the
rendered bounds.

There's also QgsMarkerSymbol::bounds which returns an approximate
bounding box of a marker symbol, which also accounts for things like
the stroke and offset.

Nyall


>
> Thanks,
>
> Calvin
>
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