摘要
MapObjects中对图层的控制方法是预先将图层的控制信息写在程序里,在程序运行时对图层进行约束.这种通过编写程序进行控制的方法不但比较麻烦,而且当图层的控制方式发生变化时,维护困难.提出基于数据库的图层管理和控制机制,先将图层的控制信息放在数据表里,系统运行时动态读取图层的控制信息,实现对图层进行方便、直观地约束.
The method of manipulating layers in MapObjects is programming about the controlling information of layers in advance. This kind of method is fussy and difficult to maintain when the mode of accessing layers is changed. Data-Based control mechanism of MO layers can solve the problem effectively.
出处
《后勤工程学院学报》
2005年第2期80-82,共3页
Journal of Logistical Engineering University
