Intelligent Computer Aided Design for Railway Yard Line Diagram Based on Blocks with Feeler Vector

The new intelligent computer aided design method is developed for a kind of line diagram based upon defining blocks' feeler vectors and several effective algorithms. The contribution of this paper is to define the feeler vectors for CAD block that the relationship of adjoined blocks in a rough plan could be recognized and the design drawing can be calculated by means of this relationship. A rough plan is constructed interactively in CAD system according to prepared structure and stylus. The rough plan can be transformed to design drawing by means of intelligent recognizing and coordinates computing mathematic model. The combination applying of the sketch input and structural model developed in the paper makes it available to design railway yard in an automatic and optimized method.