应用ObjectARX开发地形图的窗口剪切程序  

Application of ObjectARX to developing Window clipping program for topographic maps

作　　者：程亚飞[1] 王卫东[1] 

机构地区：[1]中南大学土木建筑学院,长沙410075

出　　处：《铁路计算机应用》2007年第10期4-6,共3页Railway Computer Application

摘　　要：为了对公路或铁路线路大幅带状地形图中的直线、多义线、样条曲线、圆、填充和块等各种实体方便地进行剪切操作,利用ObjectARX在VC++平台上开发了窗口剪切程序。利用此工具可以保留任意形状窗口内的实体,删除窗口外的其余部分,且不改变实体的原有属性。不论是开环还是闭环的线状实体,均利用getSplitCurves()对线状实体重画,同时完善了对子曲线进行取舍操作的算法。To cut entities of long ribbon of topographic maps of road or railway, such as straight lines（AcDbLine）, polylines, spline curves, circles, paddings（AcDbHatch）,block（AcDbBlock） and so on, it was developed the window clipping program based on ObjectARX in the developing environment of Visual C＋＋6.0. Using this tool, we could reserve the entities keeping it＇s attribute within the arbitrary shape window and delete the parts which were out of the window after having broken the curve at the point of intersection. To striation entities,closed or opened, the function of getSplitCurves0 could re-draw the reserved entities. Also the method of reserving or deleting the sub-curves was been discussed.

关 键 词：OBJECTARX 实体剪切 地形图 窗口剪切程序 

分 类 号：TP391.72[自动化与计算机技术—计算机应用技术]