摘要
Abstract
Currently, many topographic map-generation softwares cannot produce a clean subset image, easily lose ob-jects and are slow in formation of a subset image. Instead, this paper, based on the command “break”of Autocad, de-veloped a relatively perfect subset image tool using programming language VisualLisp.关键词
Visual Lisp/圆/椭圆/样条曲线/2D多段线/图元对象Key words
VisualLisp/circle/ellipse/spline/2D pline/pixel object分类
信息技术与安全科学
