Since this is a rather large snippet check out this demo first:
View Demo...
and here is the source:
Actionscript:
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import com.actionsnippet.qbox.*
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import Box2D.Collision.Shapes.*;
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import Box2D.Common.Math.*;
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[SWF(width = 800, height = 600, backgroundColor = 0x000000, frameRate = 60)]
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var sim:QuickBox2D = new QuickBox2D(this, {debug:true});
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var sw:Number = stage.stageWidth / 30;
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var sh:Number = stage.stageHeight / 30;
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sim.addBox({x:sw / 2, y:sh, width:sw - 3, height:1, density:.0})
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sim.addBox({x:sw / 2, y:0, width:sw - 3, height:1, density:.0 })
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sim.addBox({x:0, y:sh / 2, width:1, height:sh , density:.0})
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sim.addBox({x:sw, y:sh / 2, width:1, height:sh, density:.0})
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var slider:QuickObject = sim.addBox({x:3, y:6, width:6, height:0.25, density:0, angle:0.05});
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var pusher:QuickObject = sim.addBox({x:15, y:18, width:4, height:4, density:0});
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sim.setDefault({collideConnected:false, frequencyHz:10});
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var anchor:QuickObject = sim.addCircle({x:3, y:2, radius:0.2, density:0});
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var m0:QuickObject = sim.addBox({x:3, y:5, width:1, height:0.25, fixedRotation:true});
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var j0:QuickObject = sim.addJoint({type:"distance", a:anchor.body, b:m0.body});
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var m1:QuickObject = sim.addBox({x:2.5, y:9.5, width:0.25, height:6, fixedRotation:true});
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var m2:QuickObject = sim.addBox({x:3.5, y:9.5, width:0.25, height:6, fixedRotation:true});
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var j1:QuickObject = sim.addJoint({type:"distance", a:m0.body, b:m1.body});
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var j2:QuickObject = sim.addJoint({type:"distance", a:m0.body, b:m2.body});
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var j3:QuickObject = sim.addJoint({type:"distance", a:m2.body, b:m1.body});
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var boxes:Array = [];
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var boxNum:int = 21;
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var index:int = boxNum;
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var filter:b2FilterData;
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var lookupQuickObject:Dictionary = new Dictionary();
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for (var i:int = 0; i<boxNum; i++){
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boxes[i] = sim.addBox({x:3, y:6.3 + i * 0.3, width:0.6, height:0.3, friction:0.0, allowSleep:false});
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lookupQuickObject[boxes[i].shape] = boxes[i];
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}
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var m3:QuickObject = sim.addBox({x:3, y:12.25 , width:1, height:0.25, allowSleep:false,fixedRotation:true, groupIndex:-1});
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var j4:QuickObject = sim.addJoint({type:"revolute", a:m1.body, b:m3.body});
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var j5:QuickObject = sim.addJoint({type:"revolute", a:m2.body, b:m3.body});
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var t:Number = Math.PI;
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var dropBox:int = 0;
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var prevBox:QuickObject;
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var resetVec:b2Vec2 = new b2Vec2(0,0);
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function setGroupIndex(b:QuickObject, index:int):void{
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filter = b.shape.GetFilterData();
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filter.groupIndex = index;
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b.shape.SetFilterData(filter);
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}
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sim.start();
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sim.addEventListener(QuickBox2D.STEP, onStep);
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function onStep(evt:Event):void{
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dropBox++;
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if (dropBox % 80 == 0){
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index--;
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if (index> -1){
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if (prevBox){
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setGroupIndex(prevBox, 1);
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}
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prevBox = boxes[index]
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setGroupIndex(boxes[index], -1);
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m3.y += 0.05;
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}
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}
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if (index <0){
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if (pusher.x> 3.5){
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pusher.x -= 0.05;
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}
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}
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for (var i:int = 0; i<boxNum; i++){
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if (boxes[i].y> 22){
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boxes[i].angle = 0;
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boxes[i].y = -2;
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boxes[i].x = 1;
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boxes[i].body.SetLinearVelocity(resetVec);
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}
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}
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if (index> 0){
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anchor.x = 6 + 3 * Math.cos(t);
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t += 0.01;
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}
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}
