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物理学っぽい動きをする何かシリーズ1
物理の何かシリーズ。2D簡易バージョン

@author naoto koshikawa

by naoto5959 24 Jan 2009

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package
{
	import flash.display.MovieClip;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.geom.Point;
	import flash.text.TextField;
	import flash.text.TextFieldAutoSize;
	
	[SWF(width = "465", height = "465", backgroundColor = "0xFFFFFF", frameRate = "30")]
	/**
	 * 物理学っぽい動きをする何かシリーズ1
	 * 物理の何かシリーズ。2D簡易バージョン
	 * 
	 * @author naoto koshikawa
	 */
	public class PhysicalSomething1 extends MovieClip
	{
		// _____________________________________________________ Property
		/** 重力の設定 大きくすると重力アップ。小さくすると重力ダウン */
		private const GRAVITY:Number = 0.9;
		
		/** 跳ね返り係数。跳ね返った後、減るスピードの率 */
		private const BOUNCE:Number = -0.7;
		
		/** 摩擦係数。摩擦により減っていくスピードの率 */
		private const FRICTIION:Number = 0.9;
		
		/** animation target */
		private var _target:Sprite;
		
		/** speed */
		private var _speed:Point;
		
		/** accerator */
		private var _acc:Point;
		
		/** mouse point */
		private var _mouse:Point;	
		
		// _____________________________________________________ Method
		/**
		 * constructor
		 */
		public function PhysicalSomething1() 
		{
			var txt:TextField = new TextField();
			txt.text = "ドラッグするとそっち(ドラッグ時に出る赤い線方向)にぶっ飛びます。";
			txt.autoSize = TextFieldAutoSize.CENTER;
			txt.x = stage.stageWidth / 2 - txt.width / 2;
			addChild(txt);
			
			_speed = new Point();
			_acc = new Point();
			_mouse = new Point();
			
			_target = new Particle();
			_target.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownListener);
			_target.x = Math.random() * (stage.stageWidth - _target.width) + _target.width / 2;
			addChild(_target);
			addEventListener(Event.ENTER_FRAME, enterFrameListener1);
		}
		
		
		// _____________________________________________________ Listener
		/**
		 * MouseEvent.MOUSE_DOWN event listener
		 * @param	event
		 */
		private function mouseDownListener(event:MouseEvent):void
		{
			_target.startDrag();
			_mouse.x = mouseX;
			_mouse.y = mouseY;
			event.currentTarget.removeEventListener(event.type, arguments.callee);
			stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpListener);
			
			removeEventListener(Event.ENTER_FRAME, enterFrameListener1);
			addEventListener(Event.ENTER_FRAME, enterFrameListener2);
		}
		
		/**
		 * MouseEvent.MOUSE_UP event listener
		 * @param	event
		 */
		private function mouseUpListener(event:MouseEvent):void
		{
			_target.stopDrag();
			event.currentTarget.removeEventListener(event.type, arguments.callee);
			_target.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownListener);
			
			removeEventListener(Event.ENTER_FRAME, enterFrameListener2);
			addEventListener(Event.ENTER_FRAME, enterFrameListener1);
		}
		
		/**
		 * Event.ENTER_FRAME event listener
		 * @param	event
		 */
		private function enterFrameListener1(event:Event):void
		{
			graphics.clear();
			
			_speed.y += GRAVITY; // 重力
			_speed.x *= FRICTIION; // 摩擦
			
			_target.x += _speed.x;
			_target.y += _speed.y;
			
			// 衝突時には、反対方向のスピードを加算する
			if (stage.stageWidth < _target.x + _target.width / 2)
			{
				// right
				_target.x = stage.stageWidth - _target.width / 2;
				_speed.x *= BOUNCE;
			}
			else if (_target.x - _target.width / 2 < 0)
			{
				// left
				_target.x = _target.width / 2;
				_speed.x *= BOUNCE;
			}
			if (stage.stageHeight < _target.y + _target.height / 2)
			{
				// bottom
				_target.y = stage.stageHeight - _target.height / 2;
				_speed.y *= BOUNCE;
			}
			else if (_target.y - _target.height / 2 < 0)
			{
				// top
				_target.y = _target.height / 2;
				_speed.y *= BOUNCE;
			}
		}
		
		/**
		 * Event.ENTER_FRAME event listener
		 * during _target is dragging
		 * @param	event
		 */
		private function enterFrameListener2(event:Event):void
		{
			_speed.x = _target.x - _mouse.x;
			_speed.y = _target.y - _mouse.y;
			
			// ドラッグ方向へ線分を描写
			graphics.clear();
			graphics.lineStyle(1, 0xFF0000);
			graphics.moveTo(_target.x, _target.y);
			graphics.lineTo(_mouse.x, _mouse.y);
		}
	}
	
}
import flash.display.Graphics;
import flash.display.MovieClip;

class Particle extends MovieClip {
	// _____________________________________________________ Method
	/**
	 * constructor
	 */
	public function Particle():void
	{
		var gr:Graphics = graphics;
		gr.beginFill(0xCCCCCC * Math.random() + 0xCCCCCC, 0.9);
		gr.drawCircle(0, 0, 20);
	}
}