MapX下绘制等值线图的一种简易方法

Simple Method of Protracting Isoline in MapX

介绍了一种适用于格网式数字模型追踪等值线的简易算法,避免了等值点追踪连接的不确定性。在此基础上利用MapX控件为图形平台,在VC++环境下编程绘制等值线图,实现了放大、缩小、漫游、属性查询、空间分析等GIS功能。

The paper introduces a simple algorithm of tracing isoline which is the same with the digital model ingrid format. And the algorithm can avoid the uncertaity of connecting and tracing the isoline. On the basis of the algorithm, we program the computer to protract the isoline in VC++ by using MapX control as a graphics tool, and accomplish the basic GIS function of magnifying, diminishing, roaming, and analyzing and querying the spatial data and attributive data.