| 图形存储结构对地图制图软件中图形编辑功能的影响 |
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| 引用本文： | 杨勇,叶民盛,刘敏.图形存储结构对地图制图软件中图形编辑功能的影响[J].测绘工程,2006,15(4):41-44,57. |
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| 作者姓名： | 杨勇 叶民盛 刘敏 |
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| 作者单位： | 武汉大学,资源与环境科学学院,湖北,武汉,430079;江西师范大学,地理与环境学院,江西,南昌,330022 |
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| 基金项目： | 国家测绘局基金项目资助(1469990324231) |
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| 摘 要： | 地图制图软件中,图形编辑功能与其撤消/重做(Undo/Redo)功能是必不可少的,一个好的图形存储结构能方便图形编辑操作及其Undo/Redo功能的实现。文中介绍了基于Oracle数据库的地图制图软件中图形数据的储存结构,其中包括数据库中的图形储存;图形数据从数据库中读入内存后的存储结构和图形编辑数据存储结构。在储存结构的基础上提出图形编辑及其Undo/Redo执行方法,并给出具体的实现代码,实验证明该方法提高了运行效率,减少了内存消耗。
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| 关 键 词： | 存储结构 图形编辑 Undo Redo 编辑参数 |
| 文章编号： | 1006-7949（2006）04-0041-04 |
| 收稿时间： | 2006-04-06 |
| 修稿时间： | 2006-04-06 |
Impact of graphic storage structure on function of graphic editing in mapping software |
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| YANG Yong,YE Min-sheng,LIU Min.Impact of graphic storage structure on function of graphic editing in mapping software[J].Engineering of Surveying and Mapping,2006,15(4):41-44,57. |
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| Authors: | YANG Yong YE Min-sheng LIU Min |
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| Institution: | 1. School of Resource And Environmental Science, Wuhan University, Wuhan 430079, China;2. School of Geography and Environ- ment, Jiangxi Normal University, Nanchang 330022, China |
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| Abstract: | Functionality of graphic editing and Undo/Redo are an essential part in mapping software.A good storage structure of shape will be convenient for them.This topic can be divided into two main parts. In the first part,storage structure of shape is described in great detail for editing module in oracle-based mapping software.It includes three parts: storage structure of shape in database,storage structure of shape in memory and storage structure of shape's edit.In the second part,a general formula for graphic editing are put forward as well.Based on this formula,an effective Undo/Redo implementation principle is proposed in the last part,which enables editing types and corresponding parameters to save,and also can extract them.Specific programming code is also included in this part. |
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| Keywords: | structure of storage graphic editing undo redo editing parameter |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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