The graphics software is mainly used for the graphic display and geometric modeling of the system, providing the necessary information for design and display. In addition, it also participates in file management, data input and output, and storage management as an intermediary between the application and the operating system. The database mainly stores and manages various data required and generated during the design process. Through the secondary development of the graphics system, the application realizes the seamless connection of the four (operating system, graphics software, database and application itself), and explicitly accepts the data in the foreground in the form of a dialog box (or command). Human output and processing. Writing a specific functional application is the main task of building a standard design and manufacturing system. Since the application is written in C10+ language. For convenience, the MFe class library is heavily used in programming. Several considerations of the overall scheme of the system (1) Consistency of the system style The system uses AutoCAD 20 (X) as the development environment, and its operation mode and dialog box style should be close to or consistent with Auto-cADZo. Using objectARxZo can better guarantee this <1>. (2) Friendly user interface and interactive system adopts the common interface organization form of Win-dows or AutocAD. All commands can give function prompts and set shortcut keys to facilitate users who like to use cAD command line for operation and input. . (3) System Advancement System development fully considers the advancement of supporting software platforms and development tools. Use object-oriented programming ideas to make the best combination of the two. (4) Practicality of the system The system uses relevant parameter links, function prompts, hotkeys and other techniques to make the operation as simple as possible. (2) The formulas and charts used in the design of parts are mainly referred to the authoritative literature. (3) In order to make the designer get rid of the dependence on the manual during design, problems (such as the meaning of design parameters, value range and selection principle) can be queried at any time, and the program provides real-time help as much as possible. (4) Automatically standardize the calculated structure size and allow the designer to modify it according to his own wishes and judgments. The drawing module mainly completes the generation and management of various standard parts graphics. The main features are: (1) refer to the relatively new authoritative national standard of engineering drawing in the graphic drawing method, and adopt the current setting in the layer setting. The standard of the CAD industry in China makes the generated graphics conform to the norms. (2) The operation mode is completely consistent with the style of the original cAD system. Except for a small number of new commands (which can be executed from the menus and dialog boxes, the meaning is clear at a glance) still retains the original contents of the CAD. (3) The module provides a large number of assembly drawings containing standard parts. These figures exist in the form of primitives. It can be easily embedded into the graphics drawn by the system by inserting block commands from the system, which is greatly convenient. Drawing of assembly drawings. The calculation module of the calculation module is composed of three sub-modules, namely a data input sub-module, a data processing sub-module and a data output sub-module. The data input sub-module and the data output sub-module are interfaces of the computing module and the user interaction, appearing in the form of a dialog box, and the data processing sub-module mainly calculates the corresponding parameters according to the calculation model, and saves the calculation result in the file format. For the output display and the call of the data exchange module.
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