Graphic interactive input system for high-rise building structures in CAD

Abstract

A graphic interactive input system developed for use in computer-aided design (CAD) of high-rise building structures is presented. In this system, the primitive information is input to computer through graphic display. The input object appears on the screen as an image and is directly visible. With the interactive operation, the designer can carry out the input rapidly and efficiently by moving the cursor on the screen, and the graph that represents the information about the structure can be modified easily. Using multicolor graphics, animated cartoons, multiple windows, and multiple-level menus, autogeneration and autonumbering of the members are performed, and the geometric and loading information can be input conveniently. In this paper, some basic conceptions and algorithms of graphic input and screen data collection are described.