基于MapObjects的GIS应用开发浅析

A Viewpoint of GIS Application Development on Mapobjects

从控件技术出发 ,介绍了建立在对象链接与嵌入技术基础上的 GIS控件 Map Objects的运行机制 ,并结合敦煌及其周边地区环境信息系统的开发 ,对开发中的一些具体问题进行了分析。提出用各地理要素的分层显示来实现不同层的叠加显示 ,利用与矢量图形数据绑定的属性数据控制矢量要素和标识文字的分级显示 ,将显示的汉字字体大小与比例尺的缩放联系起来实现美观的中文符号表现的方法。

Component technology pushed object\|oriented technology and distributed calculation efficiently, and then advanced software development. ActiveX control has been the standard of component technology of microsoft. This article began with the component technology, then introduce a GIS ActiveX control Mapobjects 1.2, and analyses its mechanism. Based on the application environment information system of Dunhuang and surrounding area, the authors analyse some detailed questions and present the solutions. In this system, we tried to display overlaid different coverage by displaying coverages we chose. To display vector shape and label text in several levels, we added some control field in the attribute table that was bounded to vector shape file. We decorate Chinese symbols displaying by relating map scale to Chinese font size. In addition, the authors presented some appreciation dealing with the error and packing and distributing of application.