[Qgis-user] Rule-based symbol for point within polygon in QGIS

[Stefan Giese (WhereGroup)]

Depends on your QGIS version, from 3.16 onwards you can use the 
overlay-functions to proof if the point and polygonlayer are in a 
spatial relation like intersects or touches and so on. The expression 
for your first rule will be like this one:

/"VAL_PROTECTION_EP3" = '1' AND  "TYPE"  = 1 AND overlay_intersects( 
layer:='pol', filter := ("TYPE" in ('P','E') AND "CAT_CANTON" = 2) OR 
("TYPE" in ('P','E') AND "CAT_CANTON" = 3))/

In the overlay_intersects-part you have to change the layername to your 
polygon layer.

If you have an older QGIS Version you can achieve the more or less same 
result with the refFunctions Plugin.

Hope this helps

Best regards

Stefan

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Am 30.08.2021 um 16:36 schrieb Jeanneret Cédric:
>
> I would like to use a set of rules to draw features from a point_layer 
> that are within a polygon_layer.
>
> Points that answer true to
>
> ("VAL_PROTECTION_EP3" = '1' AND  "TYPE"  = 1)
>
> and that are within polygons that answer true to
>
> ("TYPE" in ('P','E') AND "CAT_CANTON" = 2) OR ("TYPE" in ('P','E') AND 
> "CAT_CANTON" = 3)
>
> should be displayed as red dots
>
> Points that answer true to
>
> ("VAL_PROTECTION_EP3" = '2' AND  "TYPE"  = 1)
>
> and that are within polygons that answer true to
>
> ("TYPE" in ('P','E') AND "CAT_CANTON" = 2) OR ("TYPE" in ('P','E') AND 
> "CAT_CANTON" = 3)
>
> should be displayed as orange dots
>
> Points that answer true to
>
> ("VAL_PROTECTION_EP3" = '3' AND  "TYPE"  = 1)
>
> and that are within polygons that answer true to
>
> ("TYPE" in ('P','E') AND "CAT_CANTON" = 1)
>
> should be displayed as yellow dots
>
> I cannot find the right combination of expressions for the rule to work.
>
> Any help would be appreciated: what would a working syntax be for such 
> a rule to work in QGIS Layer Styling panel ?
>
> Cédric Jeanneret
>
>
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