[QuickBox2D] Soft body

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@author paq89

by paq 06 Mar 2010

• Forked from paq's [QuickBox2D] Bizarre object
• Diff: 88
• Related works: 4

Tags

QuickBox2D beautifl box2d fisics fluid liquid physics soft_bodies
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/**
 * Copyright paq ( http://wonderfl.net/user/paq )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/jCI0
 */

package 
{
	import Box2D.Common.Math.b2Vec2;
	import com.actionsnippet.qbox.objects.CircleObject;
	import com.actionsnippet.qbox.QuickBox2D;
	import flash.display.BlendMode;
	import flash.display.MovieClip;
	import flash.display.Sprite;
	import flash.display.StageQuality;
	import flash.events.Event;
	
	/**
	 * ...
	 * @author paq89
	 */
	[SWF(backgroundColor="0xFFFFFF", width=465, height=465, frameRate=60)]
	public class Main extends Sprite 
	{
		private var _qbox:QuickBox2D;
		private var _softbody:/*SoftBody*/Array = [];
		
		public function Main():void 
		{
			if (stage) init();
			else addEventListener(Event.ADDED_TO_STAGE, init);
		}
		
		private function init(e:Event = null):void 
		{
			removeEventListener(Event.ADDED_TO_STAGE, init);
			
			// クオリティーを低に
			stage.quality = StageQuality.LOW;
			
			// QuickBox2Dを表示するMovieClipを作成
			var mc:MovieClip = new MovieClip();
			addChild(mc);
			
			// QuickBox2Dを作成
			_qbox = new QuickBox2D(mc);
			// 色の設定
			_qbox.setDefault( { lineAlpha:0, fillColor:0 } );
			
			_qbox.createStageWalls();
			_qbox.mouseDrag();
			_qbox.start();
			
			// 箱を2つ作成
			_qbox.addBox( { x:10, y:1, width:1, height:1 } );
			_qbox.addBox( { x:12, y:1, width:2, height:2 } );
			
			// Alphaを0にして見えないようにする
			_qbox.setDefault( { lineAlpha:0, fillAlpha:0 } );
			
			for (var i:int = 0; i < 2; i++) 
			{
				_softbody[i] = new SoftBody(_qbox, { x:i * 3 + 4, y:7, lineAlpha:0, fillColor:0xFFFFFF * Math.random(), radius:i + 1 } );
				addChild(_softbody[i]);
			}
			
			// イベントリスナー
			addEventListener(Event.ENTER_FRAME, loop);
		}
		
		private function loop(e:Event):void 
		{
			for each (var sb:SoftBody in _softbody) 
			{
				sb.update();
			}
		}
		
	}
	
}
import flash.display.Sprite;
import Box2D.Common.Math.b2Vec2;
import com.actionsnippet.qbox.QuickBox2D;
import com.actionsnippet.qbox.objects.CircleObject;
import com.actionsnippet.qbox.QuickObject;

class Anchor extends CircleObject
{
	private var vx:Number = 0;
	private var vy:Number = 0;
	private var spring:Number = 2;
	private var friction:Number = 0.1;
	private var vec:b2Vec2;
	public var target:QuickObject;
	private var rot:Number;
		
	public function Anchor(qbox:QuickBox2D, params:Object, target:QuickObject = null, rot:Number = 0)
	{
		super(qbox, params);
		this.target = target;
		this.rot = rot;
		vec = new b2Vec2();
	}
	
	public function update():void
	{
		if (!target) return;
		var targetPos:b2Vec2 = target.body.GetPosition();
		var thisPos:b2Vec2 = body.GetPosition();
		var dx:Number = Math.sin(rot * Math.PI / 180)*2 + targetPos.x - thisPos.x;
		var dy:Number = Math.cos(rot * Math.PI / 180)*2 + targetPos.y - thisPos.y;
		var ax:Number = dx * spring;
		var ay:Number = dy * spring;
		vx += ax;
		vy += ay;
		vec.x = vx;
		vec.y = vy;
		body.ApplyForce(vec, thisPos);
		vx *= friction;
		vy *= friction;
	}
}

class SoftBody extends Sprite
{
	public var params:Object;
	private var _anchor:/*Anchor*/Array = [];
	private var qbox:QuickBox2D;
	
	public function SoftBody(qbox:QuickBox2D, params:Object)
	{
		this.params = params;
		this.qbox = qbox;
		if (this.params.lineColor == null) this.params.lineColor = 1;
		if (this.params.lineAlpha == null) this.params.lineAlpha = 1;
		if (this.params.fillColor == null) this.params.fillColor = 0;
		if (this.params.fillAlpha == null) this.params.fillAlpha = 1;
		if (this.params.radius == null) this.params.radius = 1;
		
		create();
	}
	
	private function create():void
	{
		var rot:Number = 0;
		for (var i:int = 0; i < 18; i++) 
		{
			rot+=20;
			_anchor[i] = new Anchor(qbox, { x:Math.sin(rot * Math.PI / 180) * params.radius + params.x, y:Math.cos(rot * Math.PI / 180) * params.radius + params.y, radius:0.1 }, _anchor[i - 1], rot);
			_anchor[i].shape.m_radius = 0.1 * params.radius;
			if (i != 0) qbox.addJoint( { type:QuickBox2D.DISTANCE, a:_anchor[i-1].body, b:_anchor[i].body } );
		}
		
		qbox.addJoint( { type:QuickBox2D.DISTANCE, a:_anchor[0].body, b:_anchor[_anchor.length-1].body } );
	}
	
	public function update():void 
	{
		graphics.clear();
		graphics.beginFill(params.fillColor, params.fillAlpha);
		graphics.lineStyle(1, params.lineColor, params.lineAlpha);
		graphics.moveTo(_anchor[1].x * 30, _anchor[1].y * 30);
		var len:uint = _anchor.length;
		for (var i:int = 1; i < len; i++) 
		{
			_anchor[i].update();
			graphics.lineTo(_anchor[i].x * 30, _anchor[i].y * 30);
		}
		graphics.lineTo(_anchor[1].x * 30, _anchor[1].y * 30);
	}
}