【摘要】 本文从组件的内部结构、MapObjects基本功能的组合、MO与其它组件的结合展开讨论,提出了Visual C++6.0编程环境下的MO功能扩展的三种方式,并对其基本原理和具体程序进行了介绍,包括图层渲染类型识别、图层搜索、MO空间数据集合管理与组织,从而为更好地使用MO组件提供一种思路。更多还原

【Abstract】 From theories of the COM programming, the fundamental functions of Map objects,and the combinations of MO and other COMs, this paper discussed some extensions of MO development. As a result, a new method was put forward on the recognition about the renderers of layer in map datasets. From that, a new frame of organizations and management about spatial data was provided so that current setting of the map layer could be saved. In additional, the article offered an approach for searching objects according to topological relation with multiobjects such as points, lines, rectangles, polygons and so on.更多还原