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ProcessID

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== Usage == == Usage ==
-ProcessID is used when referring to specific [[process]] (an instance of a [[processType]]) and access/edit its [[local]] [[variables]]. The ProcessID of a [[process]] is found by on of the following methods:+ProcessID is used when referring to specific [[process]] (an instance of a [[processType]]) and access/edit its [[local variables]] and/or [[public variables]]. The ProcessID of a process is found by one of the following methods:
-*[[return|Returned]] when the [[frame]]; statement is found in the process.+*Returned when the [[frame]]; statement is found in the process.
-*[[return|Returned]] by the [[get_id]]() function.+*Returned by the [[get_id]]() function.
-*[[return|Returned]] by the [[collision]]() function.+*Returned by the [[collision]]() function.
-*[[store|Stored]] as the [[local]] [[variable]] [[id]] (holds the [[process]]' own ProcessID).+*Stored as the local variable [[id]] (holds the process' own ProcessID).
-*[[store|Stored]] as the [[local]] [[variable]] [[father]] (holds the ProcessID of the [[process]] that [[call|called]] the current [[process]]).+*Stored as the local variable [[father]] (holds the ProcessID of the process that [[call|called the current process).
-*[[store|Stored]] as the [[local]] [[variable]] [[son]] (holds the ProcessID of the [[process]] last [[call|called]] from the current [[process]]).+*Stored as the local variable [[son]] (holds the ProcessID of the process last called from the current process).
-*[[store|Stored]] as the [[local]] [[variable]] [[bigbro]] (holds the ProcessID of the [[process]] [[call|called]] by the [[father]] immediately before the current [[process]]).+*Stored]] as the local variable [[bigbro]] (holds the ProcessID of the process called by the [[father]] immediately before the current process).
-*[[store|Stored]] as the [[local]] [[variable]] [[smallbro]] (holds the ProcessID of the [[process]] [[call|called]] by the [[father]] immediately after the current [[process]]).+*Stored as the local variable [[smallbro]] (holds the ProcessID of the process called by the [[father]] immediately after the current process).
<br /> <br />
-The ProcessID can either be used as an [[argument]] for a [[function]] such as [[get_angle]]() or [[get_dist]]() or as a way of using the [[local]] [[variable]] of another [[process]]. For example, to use the [[x]] and [[y]] [[local]] [[variables]] of a [[process]].+The ProcessID can either be used as an [[argument]] for a [[function]] such as [[get_angle]]() or [[get_dist]]() or as a way of using the local or public variable of another process. For example, to use the [[x]] and [[y]] local variables of a [[process]].
 + 
 +== Example ==
 +<pre>
 +Program example;
 + 
 +Declare Process SpaceShip()
 + Public
 + int speed = 50;
 + String name = "Galactica";
 + End
 +End
 + 
 +Global
 + SpaceShip ship;
 +Begin
 + 
 + ship = SpaceShip(); // ship now holds the ProcessID of an instance of SpaceShip
 + // Code in SpaceShip will be executed until the first frame; is reached
 + 
 + say(ship.name + ": " + ship.speed); // We address the public variables of ship
 + 
 + signal(ship,S_KILL);
 + 
 + Repeat
 + frame;
 + Until(key(_ESC))
 + 
 +End
 + 
 +Process SpaceShip()
 +Begin
 + name = "Pegasus";
 + speed = 60;
 + Loop
 + frame;
 + End
 +End
 +</pre>
 +Used in example: [[say]](), [[signal]](), [[key]](), [[Program]], [[Declare]], [[Public]], [[Global]], [[Begin]], [[Repeat]], [[Loop]], [[frame]]
== Example == == Example ==

Revision as of 00:16, 19 December 2007

Contents

Definition

A ProcessID is a unique identification code, for one instance of a processType. A ProcessID is always odd and larger than 65536 (2^16).
This makes it possible to use for example the function collision() in an if() statement. This is because collision() returns the ProcessID the process calling collision() has collided with.

Usage

ProcessID is used when referring to specific process (an instance of a processType) and access/edit its local variables and/or public variables. The ProcessID of a process is found by one of the following methods:

  • Returned when the frame; statement is found in the process.
  • Returned by the get_id() function.
  • Returned by the collision() function.
  • Stored as the local variable id (holds the process' own ProcessID).
  • Stored as the local variable father (holds the ProcessID of the process that [[call|called the current process).
  • Stored as the local variable son (holds the ProcessID of the process last called from the current process).
  • Stored]] as the local variable bigbro (holds the ProcessID of the process called by the father immediately before the current process).
  • Stored as the local variable smallbro (holds the ProcessID of the process called by the father immediately after the current process).


The ProcessID can either be used as an argument for a function such as get_angle() or get_dist() or as a way of using the local or public variable of another process. For example, to use the x and y local variables of a process.

Example 

Program example;

Declare Process SpaceShip()
    Public
        int speed = 50;
        String name = "Galactica";
    End
End

Global
    SpaceShip ship;
Begin

    ship = SpaceShip(); // ship now holds the ProcessID of an instance of SpaceShip
                        // Code in SpaceShip will be executed until the first frame; is reached

    say(ship.name + ": " + ship.speed); // We address the public variables of ship

    signal(ship,S_KILL);

    Repeat
        frame;
    Until(key(_ESC))

End

Process SpaceShip()
Begin
    name = "Pegasus";
    speed = 60;
    Loop
        frame;
    End
End

Used in example: say(), signal(), key(), Program, Declare, Public, Global, Begin, Repeat, Loop, frame

Example 

Private
    int ballID;
    int ballx;
    int bally;
Begin
    ballID = BallProcess();
    ballx = ball.x;
    bally = ball.y;
End
Process BallProcess( )
Begin
    Loop
        frame;
    End
End


This demonstrates using the period (".") character between the ProcessID and the variable name to access a local variable.

Note that functions do NOT have a ProcessID, as a ProcessID is assigned when the frame; statement is reached in the code, making it a process.

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