Study and development of the gas geology symbol lib based on com technology

Abstract：Standardized symbols are the foundation for the effective communication of information, but the exact representation of them is the premise to the foundation.Refer to the symbol standard of gas geology, the concept models of different symbol types are given through in-depth analysis.Finally, the gas geology symbol lib was developed with the COM technology.In order to shorten the developing period and make the lib more extensible, the COM based Dotnet platform was chosen.Meanwhile, the WinAPI functions are used to improve the drawing efficiency.As a result, the symbols lib can represent the features they stand for with high precision and easy to extend as well.

Keyword：gas geology;symbol;concept model;COM technology;