| 地图制图软件中图形编辑Undo/Redo功能的实现 |
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| 引用本文： | 杨勇,叶民盛,刘敏,张旭,李霖.地图制图软件中图形编辑Undo/Redo功能的实现[J].测绘与空间地理信息,2006,29(5):47-50. |
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| 作者姓名： | 杨勇 叶民盛 刘敏 张旭 李霖 |
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| 作者单位： | 1. 武汉大学,资源与环境科学学院,湖北,武汉,430079
2. 江西师范大学,地理科学学院,江西,南昌,330000 |
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| 摘 要： | 地图制图软件中,图形编辑功能与其撤销/重做(Undo/Redo)是必不可少的。本文详细说明了基于Ora-cle数据库的地图制图软件中编辑模块的数据模型及其定义,提出了图形编辑的一般公式。并在此公式的基础上,提出了一种高效的Undo/Redo执行原理:在编辑过程中保存编辑类型和参数,在执行Undo/Redo时提取数据编辑类型和参数进行处理,并给出了具体的实现代码。
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| 关 键 词： | 图形编辑 Undo Redo 编辑类型 编辑参数 |
| 文章编号： | 1672-5867(2006)05-0047-04 |
| 修稿时间： | 2006年4月11日 |
Graphics Editing in Mapping Software and Implementation of its Undo and Redo Functionality |
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| YANG Yong,YE Min-sheng,LIU Min,ZHANG Xu,LI Lin.Graphics Editing in Mapping Software and Implementation of its Undo and Redo Functionality[J].Geomatics & Spatial Information Technology,2006,29(5):47-50. |
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| Authors: | YANG Yong YE Min-sheng LIU Min ZHANG Xu LI Lin |
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| Abstract: | Functionality of graphics editing and Undo/Redo pl ays an essential part in mapping software.This paper is written for this topic and can be divided into two main parts.In the first part,a data model is descr ibed in great detail for editing module in Oracle-based mapping software,and l ater its definition,and a general formula for graphics editing are put forward as well.Based on this formula,an effective Undo/Redo implementation principle is proposed in the last part,which enables saving editing types and correspondi ng parameters,and also can extract them.Specific programming code is also incl uded in this part. |
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| Keywords: | functionality of graphics Undo Redo type of fu nctionality parameter of functionality |
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