figure whlch corresponds to the supplemental figure is superposed on neither the first basic figure 100 nor the second basic figure 102 certainly the supplemental figure dot data representative of the sectorial supplemental figure 98 is the supplemental figure data in the case described above the magnification of the figures in the x axis and y axis directions is the same however the principle of the invention may be practiced even where the magnification in the x axis direction is different from that in the y axis direction for example an ellipse 116 is used as the standard supplement figure as shown in fig2 where the magnification in the y axis direction is higher than that in the x axis direction in this case a first rectangular basic figure 100a and a second parallelogrammic basic figure 102a may be connected to each other without a crevice formed between the connected ends of the basic figures 100a 102a the elliptical standard supplement figure 116 exists for any angle at which the two basic figures 100a 102a are connected such that the center of the ellipse 116 is aligned with the reference intersection p of the basic figures 100a 102a the ellipticity.