How can I call upon a function with a parameter?

[Sir_Coolos]

Hey guys, I am attempting to run a function inside a loop function and I am running into a problem. Everytime i run the program it gives me this error: 1136: Incorrect number of arguments.  Expected 1.    However, I can't add the parameter because the function I am trying to run is an event function. Here is the code:

package

{

            import flash.display.Stage;

            import flash.events.Event;

            import flash.events.KeyboardEvent;

            import flash.ui.Keyboard;

           import flash.display.MovieClip;

           import flash.events.MouseEvent;

          public class Hero extends MovieClip

          {

                    public var stageRef:Stage;

                    public var health:Number = 6;

                    public var speed:Number = 3;

                    public var leftPressed:Boolean = false;

        public var rightPressed:Boolean = false;

        public var upPressed:Boolean = false;

        public var downPressed:Boolean = false;

                    public function Hero()

                    {

                               stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);

                               stage.addEventListener(Event.ENTER_FRAME, loop, false, 0, true);

                    }

                      public function loop(E:Event):void

              {

                              keyPressed();

             if(leftPressed){

                 x -= speed;

             } else if(rightPressed){

                 x += speed;

             }

             if(upPressed){

                 y -= speed;

             } else if(downPressed){

                 y += speed;

             }

              }

                    public function keyPressed(event:KeyboardEvent)

                    {

                               if (event.keyCode == Keyboard.LEFT)

                               {

                          leftPressed = true;

             } else {

                                   leftPressed = false;

             }

                    if (event.keyCode == Keyboard.RIGHT)

                               {

                           upPressed = true;

             } else {

                                    upPressed = false;

             }

                     if (event.keyCode == Keyboard.UP)

                               {

                         rightPressed = true;

             } else {

                   rightPressed = false;

             }

                     if (event.keyCode == Keyboard.DOWN)

                               {

                         downPressed = true;

             } else {

                   downPressed = false;

             }

                    }

          }

}

[Sir_Coolos]

Oh, the problem is this:

     public function loop(E:Event):void

              {

                              keyPressed();

             if(leftPressed){

                 x -= speed;

             } else if(rightPressed){

                 x += speed;

             }

             if(upPressed){

                 y -= speed;

             } else if(downPressed){

                 y += speed;

             }

              }

I try to execute the function keyPressed(); when it gives me the error.

[Ned Murphy · Accepted solution]

Define the function using the following and it should work with and without passing the argument

public function loop(E:Event=null):void

[Sir_Coolos]

It is now saying incorrect number of arguments for keyPressed(); since function keyPressed() originally had the parameter: event:KeyboardEvent

[Ned Murphy]

Try removing that line from the loop function.  It probably only needs to execute when a key press takes place.

[Sir_Coolos]

Once I do that the character that is moving continues to move even after I stop pressing the arrow keys. Is there any way I could change this:

          if(leftPressed){

                 x -= speed;

             } else if(rightPressed){

                 x += speed;

             }

             if(upPressed){

                 y -= speed;

             } else if(downPressed){

                 y += speed;

to fix the problem. I am not very good in AS3 but is there a if(left is not pressed) sort of code?

[Ned Murphy]

You could create a KEY_UP listener/handler that mirrors your KEY_DOWN event coding but takes care of setting the false values instead of the way your KEY_DOWN takes care of it.

[Sir_Coolos]

That worked perfectly. Thanks!

[Ned Murphy]

You're welcome