How to Angle & Radius Aesthetics

If you use in chart object named geom_spoke, you will see other two available aesthetics – angle and radius. geom_spoke is line segment that is parametrized by location (x,y), direction and distance. These values you can set to a static value or map to variable from the dataset. Sample of mentioned geometry (in the combination with geom_point) is shown in the following figure.

The radius and distance you can adjust using functions scale_size and scale_radius.