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I'm looking to create a line from centroid of a circle and label it with the radius using the geometry generator but don't know where to start. QGIS 2.18.15. I'm using the Ovals, Rectangles plugin to draw the circle.

  • Just FYI, I ran across this warning when searching for info on this plugin: "Be wary... That plugin has known issues and will cause your QGIS to get slower and slower over time." – ndawson – csk May 15 '18 at 18:05
  • You can also create circles by buffering a point layer, if you want to avoid any issues this plugin may cause. – csk May 15 '18 at 18:06
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Draw line from centroid to edge

Add a symbol layer to the polygon layer style.

Style the new symbol layer as Geometry Generator type (line), with this expression:

make_line( centroid( $geometry), end_point( $geometry))

Label the line with the circle's radius

Label the layer with this expression:

distance( centroid( $geometry), end_point( $geometry))

enter image description here

Adjust label placement to suit your preference. Show here with

  • placement: offset from centroid
  • quadrant: upper right

More labeling tips:

  • use the round() function to reduce the number of decimal places

    round(distance( centroid( $geometry), end_point( $geometry)),2)

  • add units using the concatenate symbol ||

    distance( centroid( $geometry), end_point( $geometry)) || ' meters'

enter image description here

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