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Enter-Statement
enter SceneName;
Enter causes the interpreter to change to a new scene.
When the scene is changed, all running scripts with the killOnExit property
set to true are killed, the objects' resources of the current scene are
deallocated, the objects' resources of the new scene are allocated, and the
enter event for the new scene is started, along with the objects'
initialization scripts.
Start-Statement
start scriptName;
start scriptName(parameters...);
start { }
The start-statement starts executing a script independently from the script
that is currently executing. Statements within the
code block in the second version above cannot access local variables outside of
their code block. In both cases, the existing script continues, and starts the
new script simultaneously. (Actually, the script does not begin executing until
the existing script delays or returns, but the new script is guaranteed to
start before the next interpreter cycle.)
Example
Suppose there are two objects, called Fred and Bob,
and they must both walk at the same time.
start {
Bob.walk(280, 430);
}
Fred.walk(300, 400);
Delay-Statement
delay;
delay expression;
Delay causes the script to sleep for a number of cycles, so that other
scripts may be executed. The expression is evaluated only once, and if it is omitted,
it is assumed to be a one-cycle delay. A delay of zero or less has no effect.
Example
Delay can be used for simple delays, or it can be used in more complex ways.
Here's how to produce the effect of random strobing of a bug zapper.
killOnExit = true; // kill when scene is exited
BUGZAPPER: // select an object to work with
autoAnimate = false; // turn off automatic frame flipping
loop {
frame = 0; // picture of light when off
delay randomRange(100, 300);
frame = 1; // picture of light when on
delay; // show zapper lit for one cycle
}
Warning: If an infinite loop exists without a delay-statement inside,
the game could seem to freeze, because the script never returns control
to the interpreter.
Return-Statement
return expression;
return;
Return halts execution of the current script and returns
to the caller if the script was called, or ends execution if the script
was started with the start-keyword (or is the body of an event).
If no return value is specified, the script will return zero.
See Also...
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