STRUCTURE OF BASIC OUTPUT PRIMITIVES FOR MINING IDUSTRY'S CAD SYSTEM AND CONFIGURATION METHOD OF POLYGON PRIMITIVES AND SIZE-INDICATING PRIMITIVES

Based on study of the structure of basic output primitives for mining industry's CAD system and the configuration method of these primitives,a scheme to build a set of basic primitives for CAD system used in mining industry with 7 elements is introduced.The configuration method of curve primitives and size indicating primitives and the idea of replacing the curve primitives by polygon primitives are studied.The new set of output primitives has great directive meaning for further development of CAD system used in mining industry.