Conditional Statements

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There are a several constructs that allow you to control the flow of the script based on the current values of axis and button variables, allowing one block of code to execute if a particular set of conditions is met, another block to execute if not.

IF/THEN

The most basic of these is the IF/THEN block. This provides control of the type:

IF some condition is true THEN do something.

The IF/THEN statements do not require a terminating semicolon.

For example, to do something only if js1.b4 is on, you might write a script fragment that look like this:

IF( JS1.B4 ) THEN
  // Do something
ENDIF

If JS1.B4 is TRUE (pressed) then the statement(s) between the THEN and the ENDIF are executed. If JS1.B4 is FALSE (released), then that script segment will be skipped.

The value in the IF statement can also be a more complex expression. For example, to execute a block of statements if both Button 1 and Button 2 on JS1 are pressed simultaneously, the scripting might look like this:

IF( JS1.B1 AND JS1.B2 ) THEN
  // Do something
ENDIF

ul IF/THEN/ELSE

There is also an IF/THEN/ELSE construct which allows one of two groups of statements to be executed depending on the state of the expression. It functions in much the same way as the IF/THEN described above but provides for a script segment it be executed when the IF statement comes up with a FALSE result. Like the IF/THEN statements, the IF/THEN statements do not require a terminating semicolon.

For example, to execute a script segment when JS1.B4 is pressed and a different script segment when it's not, you might write this:

IF( JS1.B4 ) THEN
  // Do something here if JS1.B4 is TRUE
ELSE
  // Do something here if JS1.B4 is FALSE
ENDIF

ul Nesting IF/THEN and IF/THEN/ELSE

IF/THEN and IF/THEN/ELSE sections can be "nested", i.e. an IF or ELSE clause can contain another IF clause:

IF( JS1.B4 ) THEN
  IF( JS1.B5 ) THEN
    // Do thing #1
  ELSE
    // Do thing #2
  ENDIF
ELSE
  IF( JS1.B6 ) THEN
    // Do thing #3
  ELSE
    // Do thing #4
  ENDIF
ENDIF