Context.userToDeviceDistance

void userToDeviceDistance(out double dx, out double dy)

Transform a distance vector from user space to device space. This function is similar to [cairo.context.Context.userToDevice] except that the translation components of the CTM will be ignored when transforming (dx,dy).

Parameters

`dx`	X component of a distance vector (in/out parameter)
`dy`	Y component of a distance vector (in/out parameter)