Saving and opening files. The parametric sketch system can save graph file and open existed file to edit by serial operations.5.
4．文件存取功能 参数化草图系统利用串行化操作实现文档的存取，系统可以保存图形文档，同时也可以打开已经存在的文档进行编辑。
参考来源 - 三维特征建模中参数化草图技术的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
视图管理功能参数化草图系统通过图形重画、图形放大、屏幕移动、全图显示和视图滚动等功能，以增强对系统视图的管理。
View management. The parametric sketch system strengthens view management by functions of graph redrawing, graphs zoom-out, screen move, all graphs display on the screen and view scroll and the like.
同时，建立了手绘草图的统一的参数化模型。
Meanwhile we get the universal parametric model for freehand sketch.
结合参数化设计和机械工程的实际，提出并深入研究了从静态草图到参数化绘图程序的自动转换问题。
Parametric design combined with mechanical engineering practice, the issue that transforms a draft drawing into a parametric drawing program is put forward and researched deeply.
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