Abstract:In order to draw combination line symbol which has an offset property value during the development of symbol base
of geographical information system(GIS) platform, an algorithm generating parallel polyline is put forward in the paper. The vector
algebra is used to simplify the calculating process by generating a new point set after offsetting. Accordingly it improves the efficiency
of drawing line symbol. The practice shows that the method is relatively simple in programming and it has high computing efficiency.
钟易冲, 汤军. GIS 中矢量线符号偏移量的实现[J]. 电脑与电信, 2015, 1(1-2): 91-92.
Zhong Yichong, Tang Jun. Discussion on the Offset Problem of Line Symbol in GIS. Computer & Telecommunication, 2015, 1(1-2): 91-92.