Aaron Silvers

class Asteroid extends MovieClip
{
	// velocity value for the Asteroid's x- and y- movement
	private var xv:Number;
	private var yv:Number;

	// rotation of the Asteroid, so it looks like it drifts
	// in outer space
	private var r:Number;

	private var AsteroidColor:Number = 0x00CC00;

	// this is the constructor function, which initializes
	// each Asteroid instance.  It must be a public function
	// or it won't be able to be accessed by the Flash movie.
	private function Asteroid ()
	{
		DrawAsteroid( this );

		// shorten up some Math functions
		var mr = Math.random;
		var mf = Math.floor;

		// set the velocity for the Asteroid
		xv = mf( mr() * 6 ) - 3;
		yv = mf( mr() * 6 ) - 3;

		// set the Asteroid's original rotation.
		r = mf( mr() * 360 ) - 180;
		_rotation = r;

	}

	// Each Asteroid will now encapsulates, or
	// determintes its own movement.  This will
	// improve performance over the original
	// game, where one onEnterFrame on the _root
	// controlled everything.
	private function onEnterFrame():Void
	{
		// This series of if statements simply guides the placement
		// of an asteroid as it floats near the borders of the movie.
		if ( _x < = 10 )
		{
			_x += 390;
		}
		if ( _x >= 390 )
		{
			_x -= 390;
		}
		if ( _y < = 10 )
		{
			_y += 140;
		}
		if ( _y >= 140 )
		{
			_y -= 140;
		}

		// Keep the Asteroid moving per its velocity
		_x += xv;
		_y += yv;

		// Keep the Asteroid rotating on its axis, as if it were floating
		// in space.
		_rotation += r / 60;
	}

	private function DrawRectangle ( shape )
	{
		shape.beginFill ( AsteroidColor, 100 );
		shape.lineTo ( 30, 0 );
		shape.lineTo ( 30, -30 );
		shape.lineTo ( 0, -30 );
		shape.lineTo ( 0, 0 );
	}

	// DrawRectangle();

	private function DrawTriangle ( shape )
	{
		shape.beginFill ( AsteroidColor, 100 );
		shape.lineTo ( 30, 0 );
		shape.lineTo ( 0, -30 );
		shape.lineTo ( 0, 0 );
	}

	private function DrawAsteroid( mc )
	{
		var degrees:Number = 360;

		while ( degrees -= 45 )
		{
			var i:Number = Math.floor( Math.random() * 2);
			var shape:MovieClip = this.createEmptyMovieClip( "shape" + degrees, this.getNextHighestDepth() );
			(i) ?  DrawRectangle( shape ) : DrawTriangle( shape );
			shape._rotation = degrees;
		}
	}
}