Chapter
10
I
BASIC
Keywords
STRIG/Trap Statement
STRIG(number)
ON
STRIG(number)
OFF
STRIG(number)
STOP
Turns on, turns
off,
or
temporarily halts joystick trapping.
Number
is
a
value
of
0,
2,
4,
or
6
to
indicate the joystick button
you are trapping:
0
indicates Trigger Al.
2 indicates Trigger B1.
4
indicates Trigger A2.
6
indicates Trigger B2.
Joystick
A
is
the left joystick and Joystick
B
is the right joystick.
STRIGO
ON
STRIGO
ON
enables joystick trapping with the
ON
STRIGO
GOSUB statement. If you execute
a
STRIGO
ON
statement,
BASIC checks after every program statement to see if you
pressed
a
joystick button. If you press a joystick button, BASIC
transfers program control
to
the line number specified in the
ON
STRIGO GOSUB statement. See
ON
STRIGO GOSUB.
Note:
Do
not confuse the STRIG/Trap statement with
the STRIG function statement. These are 2 separate
statements that perform 2 distinct functions in BASIC.
STRIGO STOP
STRIG() STOP temporarily halts joystick trapping. If you press a
joystick button after
a
STRIGO STOP statement is executed,
BASIC does not transfer program control to the subroutine until
trapping is turned on again with a STRIGO
ON
statement.
BASIC remembers that the joystick buttons were pressed and
transfers program control
to
the subroutine immediately after
joystick trapping is turned on again.
321
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