Basics - Variables

[NEL]

Part 1

Create a (JASS) trigger that runs when a player types "-" as exact string.
The trigger's goal is to create a footman on the map at a random position.
The unit must be created within the map's playable area.
Increase the "Counter" variable by 1 each time the trigger runs.

//! zinc
library Variables {
    private {
        integer Counter = 0;
   
        function onInit() {
            trigger trgChat = CreateTrigger();
            integer Index = 0;

            while( Index < bj_MAX_PLAYERS ) {
                TriggerRegisterPlayerChatEvent( trgChat, Player( Index ), "-", true );
                Index = Index + 1;
            }
           
            TriggerAddAction( trgChat, function() {
                unit u;
                real x = GetRandomReal( GetRectMinX( bj_mapInitialPlayableArea ), GetRectMaxX( bj_mapInitialPlayableArea ));
                real y = GetRandomReal( GetRectMinY( bj_mapInitialPlayableArea ), GetRectMaxY( bj_mapInitialPlayableArea ));
                string text;
               
                CreateUnit( GetTriggerPlayer(), 'hfoo', x, y, 0 );

                Counter = Counter + 1;
            });
           
            trgChat = null;
        }
    }
}
//! endzinc

---

Part 2

Create a new trigger (in the same trigger sheet) that runs when a unit dies.
When the trigger runs, the "Counter" must be decreased by 1, furthermore
the "Counter" 's value must be displayed on screen to get to know how many footmen are alive.

//! zinc
library Variable {
    private {
        integer Counter = 0;
   
        function onInit() {
            trigger trgChat = CreateTrigger();
            trigger trgDies = CreateTrigger();
            integer Index = 0;

            while( Index < bj_MAX_PLAYERS ) {
                TriggerRegisterPlayerChatEvent( trgChat, Player( Index ), "-", true );
                TriggerRegisterPlayerUnitEvent( trgDies, Player( Index ), EVENT_PLAYER_UNIT_DEATH, null );
                Index = Index + 1;
            }
           
            TriggerAddAction( trgChat, function() {
                unit u;
                real x = GetRandomReal( GetRectMinX( bj_mapInitialPlayableArea ), GetRectMaxX( bj_mapInitialPlayableArea ));
                real y = GetRandomReal( GetRectMinY( bj_mapInitialPlayableArea ), GetRectMaxY( bj_mapInitialPlayableArea ));
                string text;
               
                CreateUnit( GetTriggerPlayer(), 'hfoo', x, y, 0 );

                Counter = Counter + 1;
            });
           
            TriggerAddAction( trgDies, function() {
                Counter = Counter - 1;
                DisplayTextToPlayer( GetLocalPlayer(), 0, 0, "Counter: " + I2S( Counter ) );
            });
           
            trgChat = null;
            trgDies = null;
        }
    }
}
//! endzinc

 

[IcemanBo]

Yep.

Nothing to add.