Abstract: A micro-computer is coupled to the X-Y coordinate drives of a plotting table or the like and it is programmed to provide for monitor displayed pattern design. Straight or circular lines are subdivided into a number of unit steps based upon the system resolution such that each unit step segment of a straight line and each unit step chord of a circular line corresponds to said system resolution. The sine and cosine functions of the slopes of said segments or chords are summed, and the X and Y coordinate drives are advanced one unit step each time the cosine and sine functions, respectively, crosses an integer boundary.

Abstract: A large scale X-Y plotting table is provided with electro-pneumatically controlled clamping bars at opposite ends, with roller-formed troughs adjacent thereto for supporting supply and take-up rolls of sail cloth or the like. The clamping bars are coupled to foot operated switches for locking the bars alternatively in the clamping or releasing position. Index marks plotted at the fabric edge and an index line on the table, as well as a longitudinal fence, facilitate indexing the fabric between adjacent plotting fields corresponding to window fields of the associated CAD equipment.