How to rotate an object in ruby?

[tonyfull]

how to rotate an object in the direction of the cursor using Geom::Transformation.new( origin, zaxis )? Sorry for my bad eng.

[thomthom]

Geom::Transformation.new( origin, zaxis ) <- that isn't a rotation transformation.

To rotate you must use one of these formats.

Geom::Transformation.new( pt, axis, angle )

Geom::Transformation.rotation( point, vector, angle )
https://developers.google.com/sketchup/docs/ourdoc/transformation#rotation

But what is not clear is this: "how to rotate an object in the direction of the cursor"
What do you mean by this?