Ononmin Flash prototype – step 2

package {
	import flash.display.Sprite;
	public class onon extends Sprite {
		// field_mc has a parameter determining the number of big circles
		// on the stage
		public var field:field_mc = new field_mc(15);
		public function onon():void {
			addChild(field);
		}
	}
}

package {
	import flash.display.Sprite;
	import flash.events.MouseEvent;
	import flash.events.Event;
	public class field_mc extends Sprite {
		// the big circle on stage
		public var madball:madball_mc;
		// the mushroom
		public var mushroom:mushroom_mc = new mushroom_mc();
		// the bullet fired by the mushroom
		public var bullet:bullet_mc;
		// boolean to determine is the mushroom is firing
		public var firing:Boolean=false;
		public function field_mc(balls_on_stage:int):void {
			// adding the mushroom
			addChild(mushroom);
			// adding the big circles
			for (var i:int=1; i<=balls_on_stage; i++) {
				madball = new madball_mc();
				addChild(madball);
			}
			// event to be fired once the field is added to stage
			addEventListener(Event.ADDED_TO_STAGE, init);
		}
		public function init(e:Event):void {
			// simply checking for the mouse-pressed on the stage
			stage.addEventListener(MouseEvent.MOUSE_DOWN, fire);
		}
		public function fire(e:MouseEvent):void {
			// if the mushroom is not firing...
			if (! firing) {
				// shoot a bullet
				bullet=new bullet_mc();
				addChild(bullet);
				firing=true;
			}
		}
		// function to remove a bullet, to be called when the bullet flies off the stage
		public function remove_bullet():void {
			firing=false;
			removeChild(bullet);
			bullet=null;
		}
	}
}

package {
	import flash.display.Sprite;
	public class madball_mc extends Sprite {
		public function madball_mc():void {
			// simply randomly placing and scaling the ball
			x=Math.random()*400+50;
			y=Math.random()*200+50;
			width = Math.random()*100+20
			height = width
		}
	}
}

package {
	import flash.display.Sprite;
	import flash.events.Event;
	public class mushroom_mc extends Sprite {
		public var ball:ball_mc=new ball_mc();
		public function mushroom_mc():void {
			y=400;
			addChild(ball)
			addEventListener(Event.ENTER_FRAME, on_enter_frame);
		}
		public function on_enter_frame(e:Event) {
			// following mouse along X axis
			x=stage.mouseX;
		}
	}
}

package {
	import flash.display.Sprite;
	import flash.events.Event;
	public class ball_mc extends Sprite {
		// starting degrees value
		public var degrees:int=0;
		// value to transform degrees to radians
		public var deg_to_rad=0.0174532925;
		// rotation speed
		public var speed:int=2;
		public function ball_mc():void {
			addEventListener(Event.ENTER_FRAME, on_enter_frame);
		}
		public function on_enter_frame(e:Event) {
			// updating the degrees
			degrees+=speed;
			// inverting the speed if degrees are > 80 or < -80
			if (Math.abs(degrees)>80) {
				speed*=-1;
			}
			// placing and rotating the ball along the mushroom circumference
			// using a bit of trigonometry
			y=-20-30*Math.cos(degrees*deg_to_rad);
			x=30*Math.sin(degrees*deg_to_rad);
			rotation=degrees;
		}
	}
}

package {
	import flash.display.Sprite;
	import flash.events.Event;
	public class bullet_mc extends Sprite {
		// variable to convert degrees to radians
		public var deg_to_rad=0.0174532925;
		// variable to save ball direction
		public var ball_direction:Number;
		// bullet speed
		public var speed:int=4;
		public function bullet_mc():void {
			addEventListener(Event.ADDED_TO_STAGE, init);
			addEventListener(Event.ENTER_FRAME, on_enter_frame);
		}
		// initializing the bullet placing it in the right spot
		// according to mushroom position and cannon rotation
		public function init(e:Event):void {
			var par:field_mc=this.parent as field_mc;
			ball_direction=par.mushroom.ball.rotation*0.0174532925;
			x=par.mushroom.x+50*Math.sin(ball_direction);
			y=380-50*Math.cos(ball_direction);
		}
		public function on_enter_frame(e:Event):void {
			// moving the bullet using trigonometry
			x+=speed*Math.sin(ball_direction);
			y-=speed*Math.cos(ball_direction);
			if (y<0||x>500||x<0) {
				// if the bullet flies off the stage, do some garbage collection
				// and calling the function to remove the bullet
				removeEventListener(Event.ADDED_TO_STAGE, init);
				removeEventListener(Event.ENTER_FRAME, on_enter_frame);
				var par:field_mc=this.parent as field_mc;
				par.remove_bullet();
			}
		}
	}
}