PURPOSE: To easily draw the development of a box body by giving boring positions on the box body with view numbers and XY coordinates of faces viewed from the front, the rear, above, below, the right, and the left of the box body.

CONSTITUTION: View numbers are set to faces viewed from the front, the rear, above, below, the right, and the left of the box body, and a reference point and XY coordinates of each view face are determined. A boring position Z on the box body is designated with the view number and XY coordinates. In all boring modules, boring positions are designated in the same manner. If the boring position cannot be directly seen from the view point, it is necessary to designate the face code of the holing face together with the view number. A development code indicating the direction of development is set by given view number and XY coordinates.