One aspect of the present invention, in order to produce a pattern on the workpiece, there a way to re-form the sub-objects in at least one object in the pattern in the design data provided for the mask writing apparatus or direct writing device on, including how the object has a plurality of sliver in a first direction. The method, a) the task of generating a sliver list and work to repeat the following steps, namely b) a dynamic object in the object list as compared to the sliver in the sliver list Find adjacent sliver work, c) work to transfer the adjacent sliver from the sliver-list to the object list, d) work of the adjacent sliver merged with the dynamic object, e) any sliver in the sliver-list also the object including the task of repeating the operation for terminating the repetition when it is no longer adjacent to said dynamic object in the list. Another aspect of the present invention, the detailed description, shown in the drawings and claims.