| 摘要 |
PURPOSE:To form a three-dimensional projection body from two-dimensional plane graphic data while visually checking the data. CONSTITUTION:A display control part 11 divides a screen 13 into the 1st screen 13a for plotting a two-dimensional plan and the 2nd screen 1b for plotting a three-dimensional projection body based upon a division command, forms and plots the plane graphic PLV of the three-dimensional object on the 1st screen 13a based upon the operation of a mouse 14, plots the projection drawing PRV of the plane graphic on the 2nd screen 13b based upon a three-dimensional projection body forming command, sets up a segment LS connecting a specified point Q on the projection drawing to a point pointed out by a cursor CSR to a reidgeline or a segment parallel with the rigdeline, forms a three- dimensional body PRB using the projection drawing PRV as one face drawing, plots the formed body PRB on the 2nd screen 13b, and then extensively/ contractively plots a three-dimensional projection body PRB in accordance with the movement of a cursor CSR to form a required three-dimensional projection body. |
