A Subroutine Subprogram SPLOT as a Basic Function for Stereographic Illustration of Grid Data

Abstract

A computer program for stereographic illustrations of grid data (for examples, stereographic contour map and block diagram) has been used in our laboratory. The basic part of the program is a subroutine SPLOT, which projects closing two points three-dimensionally on the plane normal to the line connecting the origin of coordinates and a view (eye) point and draws only the visible part (s) on the line connecting the projected points. This paper presents a simple explanation of the subroutine SPLOT together with the program list in Appendix.