| 摘要 |
PURPOSE:To prevent a route from extending a designated area to the outside by regarding temporarily the part corresponding to the outer periphery of said designated area as a wiring obstacle. CONSTITUTION:The temporary wiring inhibition segments 6 and 7 are provided at the outer periphery of the wiring area A in accordance with a data block. At the same time, both segments 6 and 7 are linked to the front and back data blocks and not required to have the length and can be processed as dots. Thus the start point coordinates are set equal to the end point coordinates. Here no master virtual segment that produces said segments exists and therefore a master virtual segment pointer PP is not written. Instead a proper code is defined to show a temporary wiring inhibition segment. In a route searching mode it is possible to know where position of data blocks D1, D2... the horizontal virtual segment of the Y coordinates instructed by a pointer 3b exists from the X coordinates of the master virtual segment. Then a data block for the temporary wiring inhibition segment may be provided before or after the corresponding data block in order to define said horizontal virtual segment within a prescribed area.
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