The Design And Realization Of The Three-dimensional Dynamic Geometric Drawing Board

Computer aided Instruction is the method and technology of proceeding all kinds of teaching activities, developing teaching training in the assistance of computer. Dynamic Geometric Drawing Board system is the one of the main software system oriented at mathematical teaching.The article firstly introduces the studying background of Dynamic Geometric Drawing Board system and the developmental situation in domestic and abroad, puts forwards the problems existed in the recent sort of the software, and then introduces the design and realization of the three-dimensional Dynamic Geometric Drawing Board.People can edit and revise the three-dimensional Geometric models by using of the three-dimensional Dynamic Geometric Drawing Board, providing view transforming, cartoon, text and other functions in order to delay the problems of dynamic Geometric, and to provide more colorful and vivid teaching situation for the mathematical classroom.The set of system is made up of three modules: mathematical library, Geometric modular library, the controlling of situation, among which the mathematical library is the basis of the realization of the system, and it is based on the mathematical library that other modules are analyzed and developed. The mathematical library concludes: numeral calculation, vector, matrix and the quaternion. Geometric modular library is the core of the system and is also the emphasis of the article. Geometric modular library concludes Geometric module and Geometric calculation; Geometric module concludes point, line, plane, plain figure, and spatial geometric body; Geometric calculation concludes the intersection, judgment among the Geometric elements, the Geometric modeling and the Geometric analyzes. The article mainly introduces the Geometric modules and Geometric calculation of the Geometric modular library. How the controlling situation controls the Geometric modules and the relationships among them.