блоки\фигуры для игры

[GrafMine]

Делая игру дошел до точки где надо хорошо обдумать а правильно ли я начал делать ...?
вот собственно вопросы по коду:
1)задумался о соприкосновении блоков.
2)также линия сгорания.
3)центральный куб, который будет осью при rotation,можно конечно через if else, ну это куча лишнего кода...

	package elements
{
    import flash.display.*;
    import flash.events.*;
	import flash.text.*;
	import flash.utils.*
 
    public class Blocks extends Sprite
    {
        ////////////////////////////////////////////////////////////////////
        // Public properties
        ////////////////////////////////////////////////////////////////////
        ////////////////////////////////////////////////////////////////////
        // Private properties
        ////////////////////////////////////////////////////////////////////
        private var tetrisblock1: Sprite;
        private var tetrisblock2: Sprite;
        private var tetrisblock3: Sprite;
		private var tetrisblock4: Sprite;
 
		private var n1:int;
 
		private var move:Number = 20;
 
		private var tf:TextField;
 
		private var key_left:Boolean = false;
        private var key_right:Boolean = false;
		private var key_Up:Boolean = false;
 
		private var blockButton: Sprite;
 
		private var delay:uint = 400;
        private var repeat:uint ;
        private var myTimer:Timer = new Timer(delay, repeat);
		private var statusTextField:TextField = new TextField();        
        private var inputTextField:TextField = new TextField();
 
        ////////////////////////////////////////////////////////////////////
        // Public methods
        ////////////////////////////////////////////////////////////////////
		        public function Blocks()
        {
            this.tetrisblock1 = this.makeSquare();
            this.tetrisblock2 = this.makeSquare();
            this.tetrisblock3 = this.makeSquare();
			this.tetrisblock4 = this.makeSquare();
 
			this.blockButton = new  Sprite();
            var field: TextField = new TextField();
            field.defaultTextFormat = new TextFormat('calibri', 12);
            field.text = 'ReBlock';
            field.selectable = false;
            this.blockButton.addChild(field);
 
            var trigger: Sprite = new Sprite();
            trigger.graphics.beginFill(0xff00ff, 0.3);
            trigger.graphics.drawRect( -3, -3, field.textWidth + 8, field.textHeight + 8);
            trigger.graphics.endFill();
            this.blockButton.addChild(trigger);
            this.blockButton.buttonMode = true;
            this.blockButton.x = 245;
            this.blockButton.y = 150;
            this.addChild(this.blockButton);
 
			myTimer.start();
			myTimer.addEventListener(TimerEvent.TIMER, blockDown);
            myTimer.addEventListener(TimerEvent.TIMER_COMPLETE, completeHandler);
 
			this.blockButton.addEventListener(MouseEvent.CLICK, this.this_onAddedToBlock);
 
			addEventListener(Event.ADDED_TO_STAGE, this_onAddedToBlock);
			addEventListener(Event.ENTER_FRAME, moveBlocks);
 
 
        }
 
		public function rect():void
		{
			this.tetrisblock1.x = 0
			this.tetrisblock1.y = 0
			this.tetrisblock2.x = 20
			this.tetrisblock2.y = 0
			this.tetrisblock3.x = 0
			this.tetrisblock3.y = 20
			this.tetrisblock4.x = 20
			this.tetrisblock4.y = 20
		}
		    public function line():void
		{
			this.tetrisblock1.x = 0
			this.tetrisblock1.y = 0
			this.tetrisblock2.x = 20
			this.tetrisblock2.y = 0
			this.tetrisblock3.x = 40
			this.tetrisblock3.y = 0
			this.tetrisblock4.x = 60
			this.tetrisblock4.y = 0
		}
		public function snake():void
		{
			this.tetrisblock1.x = 0
			this.tetrisblock1.y = 0
			this.tetrisblock2.x = 20
			this.tetrisblock2.y = 0
			this.tetrisblock3.x = 20
			this.tetrisblock3.y = 20
			this.tetrisblock4.x = 40
			this.tetrisblock4.y = 20
		}
		public function plus():void
		{
			this.tetrisblock1.x = 0
			this.tetrisblock1.y = 0
			this.tetrisblock2.x = 20
			this.tetrisblock2.y = 0
			this.tetrisblock3.x = 40
			this.tetrisblock3.y = 0
			this.tetrisblock4.x = 20
			this.tetrisblock4.y = 20
		}
		public function horse():void
		{
			this.tetrisblock1.x = 0
			this.tetrisblock1.y = 0
			this.tetrisblock2.x = 20
			this.tetrisblock2.y = 0
			this.tetrisblock3.x = 40
			this.tetrisblock3.y = 0
			this.tetrisblock4.x = 40
			this.tetrisblock4.y = 20	
		}
        ////////////////////////////////////////////////////////////////////
        // Private methods
        ////////////////////////////////////////////////////////////////////
        private function makeSquare() : Sprite
        {
            var spr: Sprite = new Sprite();
            spr.graphics.beginFill(0xff00ff, 0.3);
            spr.graphics.drawRect(0, 0, 20, 20);
            spr.graphics.endFill();
            this.addChild(spr);
            return spr;
 
 
        }
		private function blockDown(e:TimerEvent):void
		{
            repeat--;
            trace('таймера осталось : ' +repeat);	
		if (tetrisblock1.y < 380 &&
		tetrisblock2.y < 380 && 
		tetrisblock3.y < 380 && 
		tetrisblock4.y < 380 )	{
		tetrisblock1.y += move;
		tetrisblock2.y += move;
		tetrisblock3.y += move;
		tetrisblock4.y += move;
		trace('двигаюсь');}
 
		if ( tetrisblock4.y >= 380 && tetrisblock4.y <=400)	{
        myTimer.removeEventListener(TimerEvent.TIMER, blockDown);
		trace('застыл');}
		}
        private function completeHandler(e:TimerEvent):void {
            trace('конец!'); 
 
        }
        ////////////////////////////////////////////////////////////////////
        // Listeners
        ////////////////////////////////////////////////////////////////////
		private function this_text():void
		{
			var tf: TextField = new TextField();
			this.addChild(tf);
            var format: TextFormat = new TextFormat('Calibri', 18, 0xcccccc, true);
            tf.defaultTextFormat = format;
 
			tf.width = 200;
            tf.height = 40;
            tf.text = 'fail';
			tf.selectable = false;
 
			tf.x = 240;
			tf.y = 120
 
            tf.width = tf.textWidth + 4;
            tf.height = tf.textHeight + 4;
		}
        private function this_onAddedToBlock(e:Event) : void
        {
			removeEventListener(Event.ADDED_TO_STAGE, this_onAddedToBlock);
		    myTimer.addEventListener(TimerEvent.TIMER, blockDown);
			this.n1 = int(Math.round(Math.random() * 100));
			if (n1 >=  0 && n1 < 20) { rect();  } 
			if (n1 >= 20 && n1 < 40) { line(); }
			if (n1 >= 40 && n1 < 60) { snake(); }
			if (n1 >= 60 && n1 < 80) { plus();  }
			if (n1 >= 80 && n1 <= 100) { horse();  }				
		}
		private function key_down(e:KeyboardEvent):void
		{
	        trace('нажал'+e.keyCode);
	        if (e.keyCode == 37)
	        {
		        key_left = true;
			}
 
	        if (e.keyCode == 39)
	        {		
		        key_right = true;
			}
			if (e.keyCode == 38)
	        {		
		        key_Up = true;
			}
        }
        private function key_up(e:KeyboardEvent):void
        {
	        trace('отпустил'+e.keyCode);
			if (e.keyCode == 37)
			{
				key_left = false;;
			}
			if (e.keyCode == 39)
			{
				key_right = false;
			}
			if (e.keyCode == 38)
	        {		
		        key_Up = false;
			}
		}
		private function moveBlocks(e:Event):void
		{
				moveBlock();
				stage.addEventListener(KeyboardEvent.KEY_DOWN, key_down);
				stage.addEventListener(KeyboardEvent.KEY_UP, key_up);
		}
		private function moveBlock():void
		{
			if (tetrisblock1.x >=20 &&
			tetrisblock2.x > 10 && 
			tetrisblock3.x > 10 && 
			tetrisblock4.x > 10 ) {
					if (key_left)	  {
						tetrisblock1.x -= move;
						tetrisblock2.x -= move;
						tetrisblock3.x -= move;
						tetrisblock4.x -= move;
						trace('left'); }}
 
			if (tetrisblock1.x < 220&&
			tetrisblock2.x < 220&&
			tetrisblock3.x < 220&&
			tetrisblock4.x < 220){
					if (key_right){
						tetrisblock1.x += move;
						tetrisblock2.x += move;
						tetrisblock3.x += move;
						tetrisblock4.x += move;
						trace('right'); }}
		    if ( line || snake || plus || horse ) 
			{
				if (key_Up) { tetrisblock1.rotation += 90;
				              tetrisblock2.rotation += 90;
							  tetrisblock3.rotation += 90;
							  tetrisblock4.rotation += 90;
				}
				}
 
		}
	}
}

Исходник полностью рабочий.
Сори что все в одном классе как все доделаю сразу все распределю...
P.S.код начеркал за денек,двигаюсь в правильном направлении ?