| 摘要 |
PURPOSE:To improve visibility by canceling the directivity of an arc between the master node of a loop and the slave node of the loop by a loop display means when lining the nodes up in an X direction according to the directivity of the arc. CONSTITUTION:A loop detecting means executes the longitudinal retrieval of respective nodes 3 and sets flags successively and according to the overlapped setting of flags, loop slave node detecting means detects a loop slave node 3d forming the loop while having plural master nodes 3b and 3f. A loop master node detecting means detects the loop master node 3f forming a loop 4 by the master nodes 3d and 3f in this loop slave node 3d, and loop information 6 is recorded to specify the loop slave node 3d to this loop master node 3f. When lining the nodes 3 of the loop 4 up in the X direction in the operation of a lining-up means, a loop display means detects the loop information 6 and canceled the directivity of an arc 2 between the loop master node 3f and the loop slave node 3d. Thus, the nodes 3 forming the loop 4 can be lined up in the X direction with high visibility. |
