VLEXAMPLE - ADVANCED 4 vlex="points:{$zigZag($x,$cY,10)}" - "$zigZag" is a custum function userdefined on VLEX.$; it returns a point-string of a zigzag-line 
                VLEXAMPLE - ADVANCED 4

                vlex="points:{$zigZag($x,$cY,10)}"

                - "$zigZag" is a custum function userdefined on VLEX.$; it returns a point-string of a zigzag-line