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76 lines
1.8 KiB
Markdown
76 lines
1.8 KiB
Markdown
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The [ON STRIG(n)](ON-STRIG(n)) statement is an event procedure that directs program flow upon the press of a specified joystick button.
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## Syntax
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> **ON STRIG**(buttonFunction) [GOSUB](GOSUB) {lineNumber|lineLabel}
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> **ON STRIG**(buttonFunction[, joystickNumber]) {[GOSUB](GOSUB) {lineNumber|lineLabel} | [SUB](SUB)procedure}
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* In **QB64** the value can be any button function number with any number of joysticks. See [STRIG](STRIG) and [STICK](STICK) for parameters.
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* There are two buttonFunction for each button. The even numbered function is always the event of any press since last read.
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* The statement sends the procedure to a line number, line label or [SUB](SUB) procedure when a button event occurs.
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## QBasic
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* 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.
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## Example(s)
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Reading a STRIG event to do something in a [GOSUB](GOSUB) procedure.
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```vb
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ON STRIG(0) GOSUB 10
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STRIG(0)ON
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DO
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PRINT ".";
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_LIMIT 30
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LOOP UNTIL INKEY$ <> ""
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END
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10
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a$ = "[STRIG 0 EVENT]"
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FOR x = 1 TO LEN(a$)
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PRINT MID$(a$, x, 1);
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_DELAY 0.02
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NEXT
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RETURN
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```
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Displays any number of game pad or joystick device button presses.
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```vb
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FOR j = 1 TO 256
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FOR b = 1 TO 256
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ON STRIG((b - 1) * 4, j) JoyButton (j - 1) * 256 + b - 1
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NEXT
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NEXT
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STRIG ON
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DO
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PRINT ".";
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_LIMIT 30
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LOOP UNTIL INKEY$ <> ""
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END
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SUB JoyButton (js AS LONG)
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PRINT "Joystick #"; js \ 256 + 1; "button #"; (js AND 255) + 1; "pressed!"
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END SUB
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```
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> *Explanation:* Up to 256 controllers can be used in QB64 with many buttons to read.
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## See Also
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* [STRIG](STRIG), [STICK](STICK) (functions)
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* [STRIG(n)](STRIG(n)) (statement)
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* [_DEVICES](_DEVICES), [_DEVICE$](_DEVICE$), [_LASTBUTTON](_LASTBUTTON)
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### External links
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* [Single and Dual Stick Controllers](http://en.wikipedia.org/wiki/Analog_stick)
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