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ctrl: snap angle to %f° increments
transform handle tip

ctrl: snap skew angle to %f° increments
transform handle tip

ctrl: snap rotation angle to %g° increments, click to retract
path hande tip

ctrl+alt: preserve length and snap rotation angle to %g° increments
path handle tip

shift+ctrl: skew about the rotation center with snapping to %f° increments
transform handle tip

shift+ctrl: rotate around the opposite corner and snap angle to %f° increments
transform handle tip

shift+ctrl+alt: preserve length and snap rotation angle to %g° increments while rotating both handles
path handle tip

increment
incriment