polygons to centroid points on the fly

[Barrett Higman]

Hi all,

 

Is it possible through a rule-based style to tell a layer to display certain polygons as centroid points? For example I have joined a CSV of food serving premises to our property layer and I want to show those properties that link as a point on the map. I would prefer not to create a new layer entirely if I can help it (ie. not using Vector>Geometry Tools>Polygon centroids) as the CSV may change (I have a watch on it) and I would like the workspace to be dynamic.

 

I was thinking a style rule of something along the lines:

 

CASE WHEN "column1" in not null THEN centroid($geometry) END

 

Although the above doesn't give any errors it also doesn't work!

 

I'm not sure on the syntax when working with geometries, any help would be great :)

 

Cheers,

Barrett

 

 

 

Barrett Higman GIS Officer   (03) 5755 0555

Alpine Shire Council ABN 14 821 390 281 Great Alpine Road, Bright PO Box 139, Bright, VIC, 3741

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[Nathan Woodrow]

Hey Barrett,

Try something like this:

That is a centroid fill only on the polygon.

- Nathan

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[Barrett Higman]

Perfect.

 

I was trying to be a bit too complex! Thanks Nathan.

 

Cheers,

Barrett

 

PS. Then by adding categories to the rule-based style I can thematically map the food premises by type... damn I love QGIS!

 

 

 

 

 

Barrett Higman GIS Officer   (03) 5755 0555

Alpine Shire Council ABN 14 821 390 281 Great Alpine Road, Bright PO Box 139, Bright, VIC, 3741

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