基于对象的直线上区段综合限界计算方法  

Study on object oriented method for calculating section comprehensive gauge on straight line

作　　者：雷定猷[1] 王娟[1] 汤波[1] 

机构地区：[1]中南大学交通运输工程学院,长沙410075

出　　处：《计算机应用研究》2012年第9期3276-3279,3288,共5页Application Research of Computers

基　　金：国家自然科学基金资助项目(70971140)

摘　　要：从微观角度入手,结合面向对象思想,提出以三维实体对象描述、投影和综合为核心的直线上区段综合限界计算方法。将桥梁、隧道、其他建筑物或设备等控制物视为独立对象,结合对象特征构造以基本体素分解与几何运算相结合的实体对象描述方法;沿线路纵向投影对象,并以纵横交替扫描对投影进行预处理,刻画对象对综合限界的控制形态;通过定义交点序列、内外边等概念,设计了以交点确定和边属性判断为主体的投影对象综合算法。面向对象区段综合限界计算方法在理论上与实际拟合准确,有效地避免了遗漏隐藏控制点,准确反映控制物的空间几何形态。算例证实了方法的有效性。By leading object oriented thinking,this paper advanced a method for calculating section comprehensive gauge on straight line,which focuses on object description,projection and integration.Deemed controls,such as bridges,tunnels,other buildings or facilities and so on,as objects and depicted objects through decomposition of primitive units and geometry calculations.Projected these objects along the line and pre-processed the projections through vertical and lateral scanning in order to portray objects’ morphology about comprehensive gauge.On the basis of leading intersection point sequence,internal and external borders,it designed a algorithm for integrating objects,which based on calculation of intersection points and judgment of borders’ attribute.The method for ascertaining section comprehensive gauge fits facts,avoids omission of secret control points effectively and reflects spatial pattern of controls well.The example has confirmed the method’s validity

关 键 词：区段综合限界 对象 几何运算 纵横交替扫描 内外边 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]