Tool movement

Hi to all

I want have laser beam movement.
In circular movement i used below equation :

X : R * sin(omega * t )
Y : R * cos(omega * t )
Z : X

and now i want have a rectangular movement :

i813.photobucket.com/albums/zz.../mastercamsml/Untitled-1-1.png

I want use below equation for it :

X : V * t --> V : laser velocity
Y : D * t --> D: 0.025 ( Y step movement)
Z : ??

The question:
What method does Comsol software use? (Incremental or absolute coordination)?
In circle movement does the comsol take before value plus with new value (10 omega + 10 omega = 20 omega for new coordination position)? or the coordination system rotation step by step?

what do you offer for rectangular movement? if i use ( X: V * t ) it is ok for first line and when the Y axis step to up level, X movement must be in the opposed direction. what should i do for move in opposed direction in x axis?

What about in Z axis?

Please attention that the Y axis movement must be done when the X axis movement is finished.


Thank you