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	This will make a SpaceShip with a cyan coloured block, able to move around the screen.		This will make a SpaceShip with a cyan coloured block, able to move around the screen.
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Revision as of 11:01, 26 March 2007

Definition

A process is a subroutine to which one or more of the following apply:

• it received parameters
  
• it acts on the parameters
  
• it processes data located elsewhere
  
• it returns a value
  

In addition to these possibilities, a process always has a frame; statement. The difference between a function and a process is a process is treated as a seperate thread. This means one can't let a process return a value, as the father process continues its code as well. When a process comes to its first frame; statement, the process 'returns' its ProcessID and continues the code (in the next frame).

In earlier Fenix versions (2005 and earlier) there is no difference in syntax, however, a process is treated like a function when there is no frame; statement in the code.

When the frame; statement is reached in the code, a number of other local variables are defined or updated not only of the new process, but also of related processes. These are:

• The father variable of the new process.
• The son variable of the father process (updated).
• The bigbro variable of the new process.
• The smallbro variable of the processes called by the father immediately before the new process was called (updated).
• The son and smallbro variables are also defined of the new process, but do not yet carry values.

Example

Process SpaceShip( int file , int graph , int x , int y , int angle , int maxspeed , int maxturnspeed )
Private
    int speed;
Begin
    Loop
        speed+=key(_up)*(speed<maxspeed)-key(_down)*(speed>-maxspeed);
        angle+=(key(_left)-key(_right))*maxturnspeed;
        advance(speed);
        frame;
    End
End

Now one can call this process for example by doing the following.

Private
    int map;
Begin
    map = new_map(20,20,8);
    map_clear(0,map,rgb(0,255,255));
    SpaceShip(0,map,100,100,0,20,5000);
End

This will make a SpaceShip with a cyan coloured block, able to move around the screen.