can a round hit box be made?

[ftuzz]

So i'm making my first as3 game and its just a simple avoider style game. I've got most of the basics working but the objects that are being avoided are circles and since im using hitTestObject i get a square hit box . Is it possible to create a circular hit box?

Heres my code

package {
    import flash.display.*;
    import flash.events.*;
    import flash.text.*;
    import flash.utils.Timer;
    import flash.utils.getDefinitionByName;
    
    public class mattGame extends MovieClip {
        var ship:Ship;
        var gameTimer:Timer;
        var army:Array;
        var score:int = 0;
        const speed:Number = 7.0;
        
        public function mattGame() {
    
            army = new Array();
            var newEnemy = new Enemy( 250, -15 );
            army.push( newEnemy );
            addChild( newEnemy );
            
            ship = new Ship();
            addChild(ship);
            
            gameTimer = new Timer( 25 );
            gameTimer.addEventListener( TimerEvent.TIMER, onTick );
            gameTimer.start();
        }
        public function onTick( timerEvent:TimerEvent ):void {
            if ( Math.random() < 0.1 ){
                var randomX:Number = Math.random() * 500;
                var newEnemy:Enemy = new Enemy( randomX, -15 );
                army.push( newEnemy );
                addChild( newEnemy );
            }
            ship.x = mouseX;
            ship.y = mouseY;
            
            for each ( var enemy:Enemy in army ){
                enemy.moveDownABit();
                if ( ship.hitTestObject( enemy ) ){
                    gameTimer.stop();
                }
            }
        }
    }
}

end the enemy class to

package 
{
    import flash.display.MovieClip;
    public class Enemy extends MovieClip 
    {
        public function Enemy( startX:Number, startY:Number ) 
        {
            x = startX;
            y = startY;
        }
        
        public function moveDownABit():void 
        {
            y = y + 7;
        }
    }
}

[ASWC]

No you cannot do a circular hitbox but circle are the easiest object to detect a collision from. Simply calculate the distance from the center of the circle to whatever is colliding with it and if that distance is smaller than the circle radius you got a hit.

[dialectric]

As ASWC said, there is no built in feature to do this. You could calculate it on your own, or employ one of a number of pixel-perfect hit tests that others have written such as:

http://troygilbert.com/2007/06/pixel...actionscript3/

- dialectric

[ftuzz]

@ dialectric thanks for that, but it’s a little too complicated for my feeble mind to comprehend .

@ ASWC but my character isn’t a circle so how do i take into account the different dimensions?

[ftuzz]

actually with much thinking i go it working so big thanks dialectric