Importance

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Abstract

When a main figure (FG1) and at least one subordinate figure (FG2) are designated, a processor (11a) obtains, a point of intersection at which a figure element of the main figure (FG1) intersects each figure element, e.g., a linear element (EL.sub.1), constituting the subordinate figure (FG.sub.2). If a point of intersection exists, the figure element (EL.sub.1) is divided at the point of intersection (P.sub.c) to generate subordinate figure elements (EL.sub.11, EL.sub.12), and an item of hidden-flag data, which is indicative of a subordinate figure element (EL.sub.12) on an inner side of the main figure, is turned on. The image of the subordinate figure element (EL.sub.2) is not displayed on the display screen. In a case where a figure element such as the figure element (EL.sub.2) of the subordinate figure (FG2) is not intersected by any of the figure elements of the main figure (FG1), it is checked to see whether a starting point (P.sub.s) of the figure element resides on the inner side or outer side of the main figure. If it is on the inner side, the item of hidden-flag data of this element is turned on and this element is not displayed on the display screen.

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First Claim