Garment Cad Model Data File Conversion And Browsing System

Application of CAD system in domestic apparel enterprise more and more popularization currently, but due to differ apparel CAD pattern data files doesn't compatible each other, brought much trouble to enterprise. This Problem is founded that based on this practice of CAD spreading and Application. In this paper, is based on analysising main apparel CAD pattern data file, carried out an convert and view software, try to bulid an bridge across differ apparel CAD.If converting data file, we must know its storage structure, it needs to analysis file. At the first, introduce computer data express, data type and its storage mode, simply explain known DWG file structure of AutoCAD and DBF file structure of dBase and several hex Edit tool software, then discuss the methods of analysis data file, for example: seek common points comparison means, seek difference points means, converse test means, arrange integration means, reverting and validating means, observing and guess means, moreover bring forward flow and process of analysis apparel CAD pattern data file.Secondly, by the analysis about a great deal of file, get hold of the pattern data file structure of several main apparel CAD—Lectra, Nissyo, Richpeace(MDL, IBA, PA1 , PA2, PDF), in particular the entity structure of point, line, curve, circle, arc, text. Introduce the method that how to use middle exchange file DXF to express apparel CAD pattern file, then bring forward an new and open binary file structure used for differ apparel CAD data exchang, offered an feasible plan for apparel CAD standardization.Finally, owing to known file structure of pattern and middle, create an convert and view system that using visual C++ 6.0 and oo technology. Therefor introduced collectivity design plan of system and the mathematics model of bezier, parabola and spline that used for apparel pattern, set up 9 entries graphics entity class of point, line, circle, arc, spline, text and so on, emphasized implement of document and view, I/O method of document in separate structure of document and view, for example: data storage and transfer machine-made, actual reference frame, screen drawing, zoomdisposal, I/O of file using CFile and CStdioFile and series means and so forth, introduced deal with means of special data at convert process, system is validated with actual pattern data.