| 摘要 |
<p>The present invention aims at enabling an operator to recognize a relative positional relationship between drawing graphics and the other graphics in a virtual 3D space easily, and realizing more accurate design. CPU obtains inputted conditions that determine an orientation of the operation plane (parallel to the Y-Z coordinate plane). CPU then displays an operation plane 420 at the starting point 520 position for the next line segment, in parallel to the Y-Z coordinate plane. The plane 420 is displayed instead of the operation plane 410. The operator clicks an appropriate position on the operation plane 420 to draw next line segment. CPU sets the selected position as an end point 540, and draws a line segment 640 on the operation plane 420.</p> |
