QGIS – Fill Simple Line Polygon with Color When Selected

featurespolygonqgisselectstyle

I have a polygon vector layer with Simple line symbology.
When I select one from Attribute table, QGIS change the boundary color in yellow, but I have difficulties to find it easily between many polygons. I need every time to click on "Zoom to the selected rows".
Is there a way to fill with color a polygon when it is selected as ArcGIS software?

Best Answer

Create a new symbol layer of Geometry Generator and Simple Fill type with this expression:

case when is_selected() then $geometry end

This creates a new style that is used for selected polygons only.
To change the color of selected features, go to Menu Settings > Options > Tab Canvas&Legends > Selection Color.

Related Solutions

[GIS] Polygon fill colour specified by column R spplot

The problem is that col.regions expects a vector with values or names for colors and you are giving it factors. When you build your dataframe your string vectors are (by default) turned into factors and the levels of the factors are (by default) ordered, in this case alphabetically. This is the reason why the mapping of the colors to the categories is off. In order to allow a correct color mapping for multiple categories, I would suggest the following.

# create a table to map colors to geo-categories
lookupTable <- unique(df)

# match the different geo-categories with the lookup table 
# and retrieve the corresponding color value into a vector
colRegions <- as.vector(lookupTable$col[match(levels(SpDF$GEOLOGY), lookupTable$GEOLOGY)])

# then use it to plot
spplot(SpDF, zcol = "GEOLOGY", col.regions = colRegions)

Best Answer

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[GIS] Polygon fill colour specified by column R spplot

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