Breaking a While-loop from within.

[tophe 69]

I'm making a script that will either run once or in a loop, depending on what the user put in.

The problem is that if I break the While condition within the while-loop it will not even run once.

Lets say I do this:

nul = [this, false] execVM "myscript.sqf"

_loop = _this select 1;
_run = true;

while {_run} do
{
  doThis;
  doThat;
  if (!_loop) then {_run = false};
};

Then it seems it will first check inside the while-loop and turn the _run switch off before even executing the loop - so the doTHis and doThat will not execute.

If I run it like this: nul = [this, true] execVM "myscript.sqf" it will keep looping.

I'm thinking what should happen is that it should run until the if-statement comes and then switch _run to false, go back up and realize that it should stop and then quit.

Any help appreciated..

***** edit

Now it works....

Seems I did a typo!

Edited July 20, 2010 by Tophe
i'm an idiot

[snkman 351]

_loop = _this select 1;

if !(_loop) exitWith {};

while {True} do
{
  doThis;
  doThat;
};

You should use a sleep too?

_loop = _this select 1;

if !(_loop) exitWith {};

while {True} do
{
  doThis;
  doThat;

  sleep 1;
};

Edited July 20, 2010 by SNKMAN

[st_dux 26]

You can also use "if (condition) exitWith {}" to break out of any loop. It will not exit the entire script unless you are in the main scope.

[Grizzle 0]

You can also use "if (condition) exitWith {}" to break out of any loop. It will not exit the entire script unless you are in the main scope.

+1. I know BIS says behavior of exitWith{} may be unexpected at times, but I found it works great to exit while loops.

[TRexian 0]

I have noticed that the BI scripters use scopeName and breakTo to great effect.

From the wiki:

scopeName "main";
 while {true} do {
      scopeName "loop1";
      while {true} do {
         scopeName "loop2";
          if (condition1) then {breakTo "main"}; // Breaks all scopes and return to "main"
          if (condition2) then {breakOut  "loop2"}; // Breaks scope named "loop2"
      sleep  1; };
  sleep  1; }; 

I will probably move toward this framework in my own conditional-writing. :)

[tophe 69]

Thx guys.

Yeah SNKMAN I always use a sleep in the loops... Learned that the hard way.

Didn't know that with the exitWith. I always thought it ended the whole script.

The scope-thingy looks like a nice way to keep track of loops.

Feels a bit like doing it the old GOTO way.

[venilsonribeiro 0]

Friends, How exit this loop... end start the game ?

 

 

titlecut [" ","BLACK IN",3];

_camera = "camera" camcreate [0,0,0];

_camera cameraeffect ["external", "front"];

showCinemaBorder true;

 

while {true} do

 

{

_aliveCount = count allUnits; 

_aliveSelect = _aliveCount - 1;

_randomSelect = round random _aliveSelect;

_newTarget = allUnits select _randomSelect;

_camera camsettarget _newTarget;

_randomX = (random 6);

_randomY = (random 6);

_camera camsetrelpos [_randomX,_randomY,4];

_camera camcommit 0;

sleep (3 + (random 6));

  };

[opusfmspol 282]

 

Friends, How exit this loop... end start the game ?

 

You need a condition.  What has to happen for the loop to stop?

[venilsonribeiro 0]

It is the intro and the camera focus in each unit , need to intro runs for 60 seconds and back into the game.

[opusfmspol 282]

See if this works first:

 

End after mission has run for 60 seconds

while {time < 60} do
{
	_aliveCount = count allUnits; 
	_aliveSelect = _aliveCount - 1;
	_randomSelect = round random _aliveSelect;
	_newTarget = allUnits select _randomSelect;
	_camera camsettarget _newTarget;
	_randomX = (random 6);
	_randomY = (random 6);
	_camera camsetrelpos [_randomX,_randomY,4];
	_camera camcommit 0;
	sleep (3 + (random 6));
};

Having {true} as the condition is what makes it keep running.  It needs to be a condition that can return false if the condition is not met, and true when the condition is met. 

 

There are exceptions when you would want to use true; i.e. if you wanted it to end after a certain unit was viewed, that would get detected inside the loop, and then you would have to use an exitWith, or a scopeName with breakTo.

[venilsonribeiro 0]

Opusfmspol> Perfect!I worked very well. After the loop stopped put the script:

 

WaitUntil camCommitted _camera {};

sleep 3;

_camera cameraeffect ["terminate", "back"];

camdestroy _camera;

 

and intro returned to the player as I wanted.

Thank you my friend, now I will be able to use these dynamic intros for various missions. A big hug from Brazil.