Research on intersecting on the solid part in the dashed line of bourn symbol

Based on the principle of the template method,the authors provide a new algorithm to realize the intersecting of solid parts in the dashed line,which is needed during the drawing of bourn symbols.In the automated-mapping system developed by VC++,they process the bourn data(E00 format)of the 1:250,000 geography database,and implement the algorithm.