flash on 2010-4-22
/**
* Copyright kihon ( http://wonderfl.net/user/kihon )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/9HaF
*/
package
{
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import Box2D.Dynamics.b2World;
import Box2D.Dynamics.b2DebugDraw;
import Box2D.Collision.b2AABB;
import Box2D.Common.Math.b2Vec2;
import Box2D.Dynamics.b2Body;
[SWF(backgroundColor="0x414647")]
public class Main extends Sprite
{
private var world:b2World;
private var scale:Number = 10;
public function Main()
{
var worldAABB:b2AABB = new b2AABB();
worldAABB.lowerBound.Set(-100, -100);
worldAABB.upperBound.Set(stage.stageWidth + 100, stage.stageHeight + 100);
var gravity:b2Vec2 = new b2Vec2(0, 10);
world = new b2World(worldAABB, gravity, true);
Shape.world = world;
Shape.scale = scale;
Shape.create( { shape:Shape.RECT, x:0, y: -1, width:465, height:1 } );
Shape.create( { shape:Shape.RECT, x:-1, y: 0, width:1, height:465 } );
Shape.create( { shape:Shape.RECT, x:0, y: 465, width:465, height:1 } );
Shape.create( { shape:Shape.RECT, x:465, y: 0, width:1, height:465 } );
for (var i:int = 0; i < 10; i++)
{
var tx:int = Math.random() * 420 + 10;
var ty:int = Math.random() * 30 + 20;
var body:b2Body;
var image:Sprite = new Sprite();
if (Math.random() < 0.5)
{
var width:int = Math.random() * 30 + 20;
var height:int = Math.random() * 30 + 20;
body = Shape.create( { shape:Shape.RECT, x:tx, y:ty, width:width, height:height, density:10, restitution:1.0 } );
image.graphics.lineStyle(2.0, 0x0);
image.graphics.beginFill(0x009AD6);
image.graphics.drawRect(-width / 2, -height / 2, width, height);
image.graphics.endFill();
}
else
{
var radius:int = Math.random() * 20 + 10;
body = Shape.create( { shape:Shape.CIRCLE, x:tx, y:ty, radius:radius, density:10, restitution:1.0 } );
image.graphics.lineStyle(2.0, 0x0);
image.graphics.beginFill(0xFF9900);
image.graphics.drawCircle(0, 0, radius);
image.graphics.endFill();
}
body.m_userData = addChild(image) as Sprite;
addChild(image);
}
addEventListener(Event.ENTER_FRAME, onEnterFrame);
}
private function onEnterFrame(event:Event):void
{
for (var body:b2Body = world.m_bodyList; body; body = body.m_next)
{
if (body.m_userData)
{
body.m_userData.x = body.GetPosition().x * scale;
body.m_userData.y = body.GetPosition().y * scale;
body.m_userData.rotation = body.GetAngle() / (Math.PI / 180);
}
}
world.Step(1 / stage.frameRate, 10);
}
}
}
import Box2D.Collision.Shapes.b2CircleDef;
import Box2D.Collision.Shapes.b2PolygonDef;
import Box2D.Collision.Shapes.b2ShapeDef;
import Box2D.Common.Math.b2Vec2;
import Box2D.Dynamics.b2Body;
import Box2D.Dynamics.b2BodyDef;
import Box2D.Dynamics.b2World;
class Shape
{
public static const CIRCLE:int = 0;
public static const RECT:int = 1;
public static var world:b2World;
public static var scale:Number;
public static function addVec2(body:b2Body, x:Number, y:Number):void
{
body.SetXForm(new b2Vec2(body.GetPosition().x + x / scale, body.GetPosition().y + y / scale), body.GetAngle());
}
public static function setVec2(body:b2Body, x:Number, y:Number):void
{
body.SetXForm(new b2Vec2(x / scale, y / scale), body.GetAngle());
}
public static function addAngle(body:b2Body, rotate:Number):void
{
body.SetXForm(body.GetPosition(), body.GetAngle() + rotate * Math.PI / 180);
}
public static function setAngle(body:b2Body, rotate:Number):void
{
body.SetXForm(body.GetPosition(), rotate * Math.PI / 180);
}
public static function create(params:Object):b2Body
{
var def:b2BodyDef = new b2BodyDef();
if (params.angle) def.angle = params.angle * Math.PI / 180;
var shape:b2ShapeDef;
if (params.shape == Shape.RECT)
{
def.position.Set((params.x + params.width / 2) / scale, (params.y + params.height / 2) / scale);
shape = new b2PolygonDef();
b2PolygonDef(shape).SetAsBox(params.width / 2 / scale, params.height / 2 / scale);
}
else if (params.shape == Shape.CIRCLE)
{
def.position.Set(params.x / scale, params.y / scale);
shape = new b2CircleDef();
b2CircleDef(shape).radius = params.radius / scale;
}
shape.density = params.density;
shape.restitution = params.restitution;
var body:b2Body = world.CreateBody(def);
body.CreateShape(shape);
if (shape.density > 0) body.SetMassFromShapes();
return body;
}
}