Enter your search terms Submit search form
	Web pdp-10.trailing-edge.com

	SUBROUTINE GETOPT(N)
C************************************************************
C
C  THIS ROUTINE IS USED TO RETURN THE NUMBER
C  OF THE NEXT OPTION HIT.
C
C  POSSIBLE ERRORS:
C	NONE
C
C  WARNING:
C	IF YOU TRY AND RETURN AN OPTION HIT, WHEN THE
C	OPTION LIST IS NOT ENABLED ON THE SCREEN, YOUR
C	PROGRAM WILL GO INTO AN ENDLESS LOOP, WAITING
C	FOR THE HIT.
C
C  ROUTINES CALLED:
C	LPON   - ENABLES THE LIGHT PEN
C	ENABLE - ENABLES A DISPLAY FILE
C	LPHIT  - AWAITS A LIGHT PEN HIT
C	DISABL - DISABLES A DISPLAY FILE
C	IPHYSX - RETURNS RASTER X OF USER X
C	IPHYSY - RETURNS RASTER Y OF USER Y
C	USERX  - CONVERTS RASTER X TO USER X
C
C************************************************************
	IMPLICIT INTEGER (A - W, Z)
	REAL USERX, USERY
	INTEGER OPTION(10, 3)
	COMMON /OPTBLK/ OPTION, OPMSG, OPPTR, OPLIST

	CALL LPON
100	ID = -1
	CALL LPHIT(ID, X, Y)
	IF(ID .NE. OPLIST) GO TO 100
	IX = IPHYSX(X)
	IY = IPHYSY(Y) - 305
	N = IY / 35
	N = 10 - N
	RETURN
	END