Topic       : The GFA-Basic Compendium
Author      : GFA Systemtechnik GmbH
Version     : GFABasic.HYP v2.98 (12/31/2023)
Subject     : Documentation/Programming
Nodes       : 899
Index Size  : 28056
HCP-Version : 3
Compiled on : Atari
@charset    : atarist
@lang       : 
@default    : Document not found
@help       : Help
@options    : +g -i -s +z
@width      : 75
@hostname   : STRNGSRV
@hostname   : CAB     
@hostname   : HIGHWIRE
@hostname   : THING   
View Ref-File_C
_X
_Y

_C returns the number of color registers.

_X returns the current window width in pixels.

_Y returns the current window height in pixels.

Memo: _C = WORK_OUT(13) which is safe to use.
      _X and _Y are initialized via Line-A variables and then changed by some
      window commands if used.

      _X -> V_REZ_HZ (Line-A variables)
      _Y -> V_REZ_VT

      Avoid, _X and _Y as they change based on the window commands used.
      _X and _Y return width and height unlike the WORK_OUT() values which are
      the maximum coordinates allowed. Thus: _X = WORK_OUT(0)+1

      ST low resolution example:
      _X=320           _Y=200
      WORK_OUT(0)=319  WORK_OUT(1)=199

Line-A Variable Table+