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Art of Surface Interpolation-Chapter 3:Computer implementation

Tham khảo tài liệu 'art of surface interpolation-chapter 3:computer implementation', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 3 Computer implementation The goal of the computer implementation of the ABOS method is the creation of a flexible program which is suitable for usage in modern graphical computer applications. This chapter describes important aspects of the SURGEF implementation while the graphical user interface SurGe for Windows operating system is described in the fourth chapter. 3.1 Selection of application type Due to the fact that there is no uniform graphical user interface for all computer platforms the program was designed as a console application named SURGEF with defined interface described in the documentation in full detail see section 3.9 Interface for user applications. 3.2 Selection of programming language For the implementation of the ABOS method the programming language FORTRAN 77 was selected. The reasons for such a selection are 1. Up to now the programming language FORTRAN is the only language designed for the creation of scientific and technical applications. 2. In spite of the fact that the design of FORTRAN is obsolete its development is continuing and its compilers exist for all computer platforms. 3. With respect to the simplicity of the language it is relatively easy to create highly optimised machine code. Only a few functions are written in C language namely the function for dynamical allocation of memory this feature is missing in FORTRAN 77 filtering of input data in order that the very fast sorting C function qsort could be utilized reading of input data records C library functions for input and output are faster than FORTRAN s and computation of the convex envelope of points XYZ the only non proprietary algorithm - see S3 . The source code was compiled with the GNU FORTRAN compiler g77 and GNU C compiler gcc. Both compilers enable high optimisation both for machine code generation and for utilization of microprocessor architecture. 3.3 Program structure 3.3.1 Modularity The program SURGEF implementing the ABOS method was designed as a set .