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PDP-10 Archives
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decus_20tap4_198111
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decus/20-0125/llphit.for
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SUBROUTINE LLPHIT(DISNUM, X, Y)
C************************************************************
C
C THIS ROUTINE IS USED TO RETURN THE DISPLAY NUMBER
C AND THE USER (X, Y) OF THE PREVIOUS LIGHT PEN HIT.
C
C POSSIBLE ERRORS:
C ?INVALID REPLY TO LLPHIT (RETURNS DISNUM = 0)
C
C ROUTINES CALLED:
C SEND - SENDS A COMMAND TO THE GT40
C GET - RECEIVES A STATUS TRANSMISSION FROM THE GT40
C USERX - RETURNS USER X FROM RASTER IX
C USERY - RETURNS USER Y FROM RASTER IY
C ERROR - ERROR LOGGING ROUTINE
C
C************************************************************
IMPLICIT INTEGER (A - W, Z)
REAL USERX, USERY
100 CALL SEND(8, 0, 0, 0)
CALL GET(STATUS, IX, IY, DISNUM)
IF(STATUS .EQ. "66) GO TO 100
IF(STATUS .NE. 0) GO TO 200
X = USERX(IX)
Y = USERY(IY)
RETURN
200 CALL ERROR('?INVALID REPLY TO LLPHIT, STATUS =',STATUS)
DISNUM = 0
X = 0.
Y = 0.
RETURN
END