DCL:GRPH1:SZPACK: Basic Graphics Routines:List of Subroutines:Basci Graphics Routines
Input Coordinates Content of Processing szxxtu U Rotation/Normalization transformation, Linear interpolation szxxtt T Map projection, Great circle interpolation, Clipping at map boundaries szxxtv V Clipping in viewport szxxtp V Projection transformation, Switching between soft/hard fill szxxtr R Clipping in WS viewport szxxtz R WS transformation, buffering szxxts V Buffering (soft fill) sztnsv V Soft fill
These routines can be considered as expansions of the interface routine SZTNZc(N,PX,PY).
The following is a program for producing a tone using the basic routines.
CALL SZTNOP(ITPAT) CALL SZOPTc CALL SZSTTc(UXX,UYY) ....... CALL SZCLTc CALL SZTNCL
sztnop changes the tone pattern, performs processing concerning the direction of the boundary lines, and inquires the necessary information using sgrget, so frequent calls will affect speed.