OmniGraffle提供了许多工具用于快速创建流程图、图示、网站原型、页面布局、网络对话、脑图(哈哈！)以及其他可视化的图形。
OmniGraffle provides you with a set of tools to quickly and easily make diagrams, charts, website mockups, page-layouts, network diagrams, mind maps (huh!) and other things visual.
系统流程图是以图形的形式描述出系统主要的输入、输出和程序。
A system flowchart graphically depicts the major inputs, outputs, and processes of a system.
本文抽象了画面基本元素，设计了一组可组合的图形元件，并给出了用于绘制流程图的几个不同的工具类。
The basal element of picture was abstracted and a group of element of figure was also designed to provide some different tool classes for user to draw flow chart.
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