The ON STRIG(n) statement is an event procedure that directs program flow upon the press of a specified joystick button.
Syntax
ON STRIG(buttonFunction) GOSUB {lineNumber lineLabel}
ON STRIG(buttonFunction[, joystickNumber]) {GOSUB {lineNumber lineLabel} SUBprocedure}
- In QB64 the value can be any button function number with any number of joysticks. See STRIG and STICK for parameters.
- There are two buttonFunction for each button. The even numbered function is always the event of any press since last read.
- The statement sends the procedure to a line number, line label or SUB procedure when a button event occurs.
QBasic
- In QBasic, value of n could only be a number from 0 to 3 only as it could only monitor 2 joystick buttons and 2 joysticks.
Example(s)
Reading a STRIG event to do something in a GOSUB procedure.
ON STRIG(0) GOSUB 10
STRIG(0)ON
DO
PRINT ".";
_LIMIT 30
LOOP UNTIL INKEY$ <> ""
END
10
a$ = "[STRIG 0 EVENT]"
FOR x = 1 TO LEN(a$)
PRINT MID$(a$, x, 1);
_DELAY 0.02
NEXT
RETURN
Displays any number of game pad or joystick device button presses.
FOR j = 1 TO 256
FOR b = 1 TO 256
ON STRIG((b - 1) * 4, j) JoyButton (j - 1) * 256 + b - 1
NEXT
NEXT
STRIG ON
DO
PRINT ".";
_LIMIT 30
LOOP UNTIL INKEY$ <> ""
END
SUB JoyButton (js AS LONG)
PRINT "Joystick #"; js \ 256 + 1; "button #"; (js AND 255) + 1; "pressed!"
END SUB
Explanation: Up to 256 controllers can be used in QB64 with many buttons to read.