QuickBox2D Mini-Machine

Since this is a rather large snippet check out this demo first:

View Demo…

and here is the source:

import com.actionsnippet.qbox.*
import Box2D.Collision.Shapes.*;
import Box2D.Common.Math.*;

[SWF(width = 800, height = 600, backgroundColor = 0x000000, frameRate = 60)]

var sim:QuickBox2D = new QuickBox2D(this, {debug:true});
 
var sw:Number = stage.stageWidth / 30;
var sh:Number = stage.stageHeight / 30;
			
sim.addBox({x:sw / 2, y:sh, width:sw - 3, height:1,  density:.0})
sim.addBox({x:sw / 2, y:0, width:sw - 3, height:1,  density:.0 })
sim.addBox({x:0, y:sh / 2, width:1, height:sh ,  density:.0})  
sim.addBox({x:sw, y:sh / 2, width:1, height:sh,  density:.0})  

var slider:QuickObject = sim.addBox({x:3, y:6, width:6, height:0.25, density:0, angle:0.05});
var pusher:QuickObject = sim.addBox({x:15, y:18, width:4, height:4, density:0});

sim.setDefault({collideConnected:false, frequencyHz:10});
var anchor:QuickObject = sim.addCircle({x:3, y:2, radius:0.2, density:0});

var m0:QuickObject = sim.addBox({x:3, y:5, width:1, height:0.25, fixedRotation:true});

var j0:QuickObject = sim.addJoint({type:"distance", a:anchor.body, b:m0.body});

var m1:QuickObject = sim.addBox({x:2.5, y:9.5, width:0.25, height:6, fixedRotation:true});
var m2:QuickObject = sim.addBox({x:3.5, y:9.5, width:0.25, height:6, fixedRotation:true});

var j1:QuickObject = sim.addJoint({type:"distance", a:m0.body, b:m1.body});
var j2:QuickObject = sim.addJoint({type:"distance", a:m0.body, b:m2.body});
var j3:QuickObject = sim.addJoint({type:"distance", a:m2.body, b:m1.body});

var boxes:Array = [];
var boxNum:int = 21;
var index:int = boxNum;
var filter:b2FilterData;
var lookupQuickObject:Dictionary = new Dictionary();
for (var i:int = 0; i<boxNum; i++){
	boxes[i] = sim.addBox({x:3, y:6.3 + i * 0.3, width:0.6, height:0.3,  friction:0.0, allowSleep:false});
	lookupQuickObject[boxes[i].shape] = boxes[i];
}

var m3:QuickObject = sim.addBox({x:3, y:12.25 , width:1, height:0.25, allowSleep:false,fixedRotation:true, groupIndex:-1});

var j4:QuickObject = sim.addJoint({type:"revolute", a:m1.body, b:m3.body});
var j5:QuickObject = sim.addJoint({type:"revolute", a:m2.body, b:m3.body});

var t:Number = Math.PI;
var dropBox:int = 0;
var prevBox:QuickObject;
var resetVec:b2Vec2 = new b2Vec2(0,0);

function setGroupIndex(b:QuickObject, index:int):void{
	filter = b.shape.GetFilterData();
	filter.groupIndex = index;
	b.shape.SetFilterData(filter);
}

sim.start();
sim.addEventListener(QuickBox2D.STEP, onStep);
function onStep(evt:Event):void{
	dropBox++;
	
	if (dropBox % 80 == 0){
		index--;
		if (index > -1){
			if (prevBox){
				setGroupIndex(prevBox, 1);
			}
			prevBox = boxes[index]
			setGroupIndex(boxes[index], -1);
			m3.y += 0.05;
		}
	}
	
	if (index < 0){
		if (pusher.x > 3.5){
			pusher.x -= 0.05;
		}
	}
	for (var i:int = 0; i<boxNum; i++){
		if (boxes[i].y > 22){
			boxes[i].angle = 0;
			boxes[i].y = -2;
			boxes[i].x = 1;
			boxes[i].body.SetLinearVelocity(resetVec);
		}
	}
	
	if (index > 0){
	  anchor.x = 6 + 3 * Math.cos(t);
	  t += 0.01;
	}
}