| 摘要 |
PURPOSE:To make it unnecessary to input a graphic definition sentence from a keyboard, by calculating a distance extending from a picked point to each straight line and circular arc drawn on a display screen, and storing an intersection of two elements in the nearest distance from the picked point, in a memory as a point to be defined. CONSTITUTION:A prescribed menu item (point definition item) MN on a menu table 108b is picked by a tablet cursor 108c and it is indicated to be a point definition. Subsequently, the vicinity of an intersection of two elements (S1, S2) drawn on a display screen is picked by a graphic cursor GCS. When one point on the display screen is picked, distances L1-L3 extending from the picked point to each element (S1-S3) drawn on the display screen are calculated. Thereafter, a processor 102 stores an intersection (Pi) of the two elements (S1, S2) in the nearest distance from the picked point, as a point to be defined, in a working area 103e.
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