MapGis二次开发中动态比例尺的技术实现方案

The Technology Project on Realizing Dynamic Scale based on MapGis Second Designning

在利用MapGis平台进行基于电子地图的软件二次开发中,一个常见问题就是如何处理屏幕上动态显示的比例尺问题,因为比例尺的变化是反映基于电子地图数据精确性的一个重要标志,而MapGis提供的二次开发方式中并没有提供相关的组件或函数,程序开发人员必须要通过程序的组合方式来获得。本文结合作者运用VC进行MapGis二次开发的实践,在介绍MapGis二次开发的方式基础上,提出了一种简单实现方法,以供参考。

It is a common question that how to deal with sc reen dynamic scale when designing a digital mapping application software based on MapGis platform. Because the change of scale is an important issue on reflecting the data accuraty of digital map. However, mapgis has not correlate functions or ActiveX components for it , Programmer have to achieve by programming combinlation. We associate the practice on visual C++ design based on MapGis, and point out a simple accomplish manner.