/**
* Copyright ohisama ( http://wonderfl.net/user/ohisama )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/hyLr
*/
package
{
import Box2D.Collision.Shapes.b2CircleDef;
import Box2D.Collision.Shapes.b2PolygonDef;
import Box2D.Collision.b2AABB;
import Box2D.Common.Math.b2Vec2;
import Box2D.Dynamics.b2Body;
import Box2D.Dynamics.b2BodyDef;
import Box2D.Dynamics.b2DebugDraw;
import Box2D.Dynamics.b2World;
import com.bit101.components.Label;
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.DisplayObject;
import flash.display.Loader;
import flash.display.LoaderInfo;
import flash.display.Sprite;
import flash.display.StageQuality;
import flash.display.StageScaleMode;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.net.URLRequest;
import flash.system.LoaderContext;
[SWF(backgroundColor="0x0", frameRate="60", width="475", height="475")]
public class effect12 extends Sprite
{
private static const NUM_CIRCLES : int = 200;
private static const DEBUG_DRAW : Boolean = true;
private static const TO_PHYSICS_SCALE : Number = 1.0 / 30.0;
private static const TO_DRAW_SCALE : Number = 1 / TO_PHYSICS_SCALE;
private static const ITERATIONS : int = 5;
private static const TIME_STEP : Number = 1.0 / 30.0;
private static const STEP1_SIMULATE : int = 0;
private static const STEP2_WAIT_FOR_SLEEP : int = 1;
private static const STEP3_RECONSTRUCTION : int = 2;
private var _label : Label;
private var _refImage : BitmapData;
private var _world : b2World;
private var _objects : Array = [];
private var _frameCount : int = 0;
private var _maxFrames : int;
private var _step : int = STEP1_SIMULATE;
private var _enterFrameHandler : Function;
public function effect12()
{
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.quality = StageQuality.BEST;
_label = new Label(this, 10, 5, 'LOADING.....');
var loader : Loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, _onLoadComplete);
loader.load(new URLRequest('http://yumekikaku.dip.jp/obj/boy_10.png'), new LoaderContext(true));
}
private function _onLoadComplete(event : Event) : void
{
var loader : Loader = LoaderInfo(event.target).loader;
_refImage = Bitmap(loader.content).bitmapData;
var worldAABB : b2AABB = new b2AABB();
worldAABB.lowerBound.Set(-1000.0, -1000.0);
worldAABB.upperBound.Set(1000.0, 1000.0);
_world = new b2World(worldAABB, new b2Vec2(0.0, 10.0), true);
_world.SetWarmStarting(true);
_buildStaticBox(5 - 50, 475 / 2, 100, 1000);
_buildStaticBox(475 - 5 + 50, 475 / 2, 100, 1000);
_buildStaticBox(475 / 2, 475 - 5 + 50, 1000, 100);
_buildStaticBox(0, 0, 50, 5);
if (DEBUG_DRAW)
{
var dbgDraw : b2DebugDraw = new b2DebugDraw();
dbgDraw.m_sprite = this;
dbgDraw.m_drawScale = 30.0;
dbgDraw.m_fillAlpha = 0.0;
dbgDraw.m_lineThickness = 1.0;
dbgDraw.m_drawFlags = 0xFFFFFFFF;
_world.SetDebugDraw(dbgDraw);
}
_enterFrameHandler = _step1;
addEventListener(Event.ENTER_FRAME, _onEnterFrame, false, 0, true);
}
private function _buildStaticBox(centerX : Number, centerY : Number, width : Number, height : Number) : b2Body
{
var bodyDef : b2BodyDef = new b2BodyDef();
bodyDef.position.Set(centerX * TO_PHYSICS_SCALE, centerY * TO_PHYSICS_SCALE);
var boxDef : b2PolygonDef = new b2PolygonDef();
boxDef.SetAsBox(width * TO_PHYSICS_SCALE / 2, height * TO_PHYSICS_SCALE / 2);
boxDef.friction = 0.3;
boxDef.density = 0;
var body : b2Body = _world.CreateBody(bodyDef);
body.CreateShape(boxDef);
body.SetMassFromShapes();
return body;
}
private function _buildDynamicCircle(centerX : Number, centerY : Number, radius : Number, graphic : DisplayObject = null) : b2Body
{
var bodyDef : b2BodyDef = new b2BodyDef();
bodyDef.position.Set(centerX * TO_PHYSICS_SCALE, centerY * TO_PHYSICS_SCALE);
var circleDef : b2CircleDef = new b2CircleDef();
circleDef.radius = radius * TO_PHYSICS_SCALE;
circleDef.density = 1.0;
circleDef.friction = 0.3;
circleDef.restitution = 0.5;
var body : b2Body = _world.CreateBody(bodyDef);
body.CreateShape(circleDef);
body.SetMassFromShapes();
return body;
}
private function _onEnterFrame(event : Event) : void
{
if (_enterFrameHandler is Function)
{
_enterFrameHandler();
}
}
private function _step1() : void
{
if (_frameCount % 3 == 0)
{
var px : Number = Math.random() * 475;
var py : Number = -30;
var r : Number = Math.random() * Math.random() * 30 + 5;
var b : b2Body = _buildDynamicCircle(px, py, r);
var v : Number = (Math.random() - 0.5) * 50;
b.ApplyImpulse(new b2Vec2(v, 0), new b2Vec2());
var sp : Recorder = new Recorder();
sp.frameOffset = _frameCount;
b.SetUserData(sp);
_objects.push(
{
px : px,
py : py,
r : r,
v : v,
b : b,
sp : sp
});
if (_objects.length == NUM_CIRCLES)
{
_step = STEP2_WAIT_FOR_SLEEP;
_enterFrameHandler = _step2;
_maxFrames = _frameCount;
_frameCount = 0;
}
}
_step2();
}
private function _step2() : void
{
_world.Step(TIME_STEP, ITERATIONS);
if (DEBUG_DRAW && _frameCount % 30 == 0)
{
_world.DrawDebugData();
}
for (var bb : b2Body = _world.GetBodyList(); bb; bb = bb.GetNext())
{
var rec : Recorder = bb.GetUserData() as Recorder;
if (rec)
{
var pos : b2Vec2 = bb.GetPosition();
rec.save(pos.x * TO_DRAW_SCALE, pos.y * TO_DRAW_SCALE);
}
}
_frameCount++;
if (_step == effect12.STEP2_WAIT_FOR_SLEEP && _frameCount > 300)
{
_enterFrameHandler = null;
_step = STEP3_RECONSTRUCTION;
graphics.clear();
var n : int = _objects.length;
for (var i : int = 0; i < n; ++i)
{
var info : Object = _objects[i];
var b : b2Body = info.b;
var p : b2Vec2 = b.GetPosition();
var dx : Number = p.x * TO_DRAW_SCALE;
var dy : Number = p.y * TO_DRAW_SCALE;
var c : uint = _refImage.getPixel(dx / 475 * _refImage.width, dy / 475 * _refImage.height);
var sp : Recorder = info.sp;
sp.draw(c, info.r);
_objects[i] = sp;
}
_maxFrames += _frameCount;
_frameCount = 0;
_label.text = 'CLICK TO START';
stage.addEventListener(MouseEvent.CLICK, _onClickStage);
}
}
private function _step3() : void
{
var n : int = _objects.length;
for (var i : int = 0; i < n; ++i)
{
var sp : Recorder = _objects[i];
if (sp.frameOffset <= _frameCount)
{
if (!sp.parent)
{
addChild(sp);
}
sp.restore(_frameCount - sp.frameOffset);
}
}
_frameCount++;
}
private function _onClickStage(event : MouseEvent) : void
{
var n : int = numChildren;
while (n--)
{
removeChildAt(n);
}
_frameCount = 0;
_enterFrameHandler = _step3;
}
}
}
import flash.display.Sprite;
class Recorder extends Sprite
{
public var frameOffset : int = 0;
private var _px : Array;
private var _py : Array;
public function Recorder()
{
_px = new Array();
_py = new Array();
}
public function save(rx : Number = NaN, ry : Number = NaN) : void
{
if (isNaN(rx))
{
_px.push(x);
_py.push(y);
}
else
{
_px.push(rx);
_py.push(ry);
}
}
public function restore(frame : int) : void
{
if (frame < _px.length)
{
x = _px[frame];
y = _py[frame];
}
}
public function draw(color : uint, radius : Number) : void
{
graphics.beginFill(color);
graphics.drawCircle(0, 0, radius);
graphics.endFill();
}
}
