/**
* Copyright aobyrne ( http://wonderfl.net/user/aobyrne )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/nAdb
*/
package
{
import Box2D.Collision.b2AABB;
import Box2D.Common.Math.b2Vec2;
import Box2D.Dynamics.b2Body;
import Box2D.Dynamics.b2DebugDraw;
import Box2D.Dynamics.b2World;
import Box2D.Dynamics.Joints.b2RevoluteJointDef;
import flash.display.Sprite;
import flash.events.Event;
[SWF(backgroundColor="0x414647")]
public class Main extends Sprite
{
public var world:b2World;
public var scale:Number = 10;
public var box2dMouseY:Number;
public var box2dMouseX:Number;
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, 0);
world = new b2World(worldAABB, gravity, true);
trace( "world.GetBodyCount() : " + world.GetBodyCount() );
var draw:b2DebugDraw = new b2DebugDraw();
draw.m_sprite = this;
draw.m_drawScale = scale;
draw.m_drawFlags = b2DebugDraw.e_shapeBit | b2DebugDraw.e_jointBit;
trace( "world.GetBodyCount() : " + world.GetBodyCount() );
world.SetDebugDraw(draw);
Shape.world = world;
Shape.scale = scale;
Shape.create( { shape:Shape.RECT, x:0, y:465, width:465, height:1 } );
var bodyB:b2Body = Shape.create( { shape:Shape.CIRCLE, x:200, y:180, radius:17, density:0, restitution:0.6, name:"b" } );
var bodyA:b2Body = Shape.create( { shape:Shape.RECT, x:220, y:180, width:50, height:20, density:1, restitution:0.8 , name:"a" } );
var joint:b2RevoluteJointDef = new b2RevoluteJointDef();
joint.Initialize(bodyA, bodyB, new b2Vec2(bodyA.GetWorldCenter().x -2.5, bodyA.GetWorldCenter().y));
joint.lowerAngle = 10 / (180/Math.PI);
joint.upperAngle = 50 / (180/Math.PI);
joint.enableLimit = true;
joint.motorSpeed = 4;
world.CreateJoint(joint);
new Additions(this);
addEventListener(Event.ENTER_FRAME, onEnterFrame);
}
private function onEnterFrame(event:Event):void
{
world.Step(1 / 60, 10);
box2dMouseX = stage.mouseX / scale;
box2dMouseY = stage.mouseY / scale;
}
}
}
import Box2D.Collision.b2AABB;
import Box2D.Collision.Shapes.b2CircleDef;
import Box2D.Collision.Shapes.b2PolygonDef;
import Box2D.Collision.Shapes.b2Shape;
import Box2D.Collision.Shapes.b2ShapeDef;
import Box2D.Common.Math.b2Vec2;
import Box2D.Dynamics.b2Body;
import Box2D.Dynamics.b2BodyDef;
import Box2D.Dynamics.b2World;
import Box2D.Dynamics.Joints.b2MouseJoint;
import Box2D.Dynamics.Joints.b2MouseJointDef;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
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();
if (body.m_userData && params["name"])
{
Sprite(body.m_userData).name = params["name"];
trace( "Sprite(body.m_userData).name : " + Sprite(body.m_userData).name );
}
return body;
}
}
class Additions
{
private var main:Main;
private var _mouseJoint:b2MouseJoint;
private var timeStep:Number = 1/60;
public function Additions(mainArg:Main)
{
main = mainArg;
main.stage.addEventListener(MouseEvent.MOUSE_DOWN, createMouse);
main.stage.addEventListener(MouseEvent.MOUSE_UP, destroyMouse);
main.addEventListener(Event.ENTER_FRAME, updateMouse);
}
/**
* Taken from actionsnippet aka zevan roser's QuickBox2D class from the quickbox2D library
* @param e
*/
private function createMouse(e:MouseEvent):void
{
var body:b2Body = GetBodyAtMouse();
var _mouseJointDef:b2MouseJointDef
if (body /*&& body.para*/)
{
_mouseJointDef=new b2MouseJointDef();
_mouseJointDef.body1 = main.world.GetGroundBody();
_mouseJointDef.body2 = body;
_mouseJointDef.target.Set(main.box2dMouseX, main.box2dMouseY);
_mouseJointDef.maxForce=3000;
_mouseJointDef.timeStep=timeStep;
_mouseJoint=main.world.CreateJoint(_mouseJointDef) as b2MouseJoint;
}
}
/**
* Taken from aka actionsnippet zevan roser's QuickBox2D class from the quickbox2D library
* @param e
*/
private function destroyMouse(evt:*):void
{
if (_mouseJoint)
{
trace( "_mouseJoint : " + _mouseJoint );
main.world.DestroyJoint(_mouseJoint);
_mouseJoint=null;
}
}
/**
* Taken from actionsnippet or zevan roser's QuickBox2D class from the quickbox2D library
* @param e
*/
private function GetBodyAtMouse(includeStatic:Boolean = false):b2Body
{
var mouseXWorldPhys:Number = main.box2dMouseX;
var mouseYWorldPhys:Number = main.box2dMouseY;
var _mousePVec:b2Vec2 = new b2Vec2(mouseXWorldPhys, mouseYWorldPhys);
var aabb:b2AABB = new b2AABB();
aabb.lowerBound.Set(mouseXWorldPhys - 0.001, mouseYWorldPhys - 0.001);
aabb.upperBound.Set(mouseXWorldPhys + 0.001, mouseYWorldPhys + 0.001);
var k_maxCount:int=10;
var shapes:Array = new Array();
var count:int = main.world.Query(aabb, shapes, k_maxCount);
var body:b2Body=null;
for (var i:int = 0; i < count; ++i) {
if (shapes[i].GetBody().IsStatic()==false||includeStatic) {
var tShape:b2Shape=shapes[i] as b2Shape;
var inside:Boolean=tShape.TestPoint(tShape.GetBody().GetXForm(),_mousePVec);
if (inside) {
body=tShape.GetBody();
break;
}
}
}
return body;
}
/**
* Taken from aka actionssnippet or zevan roser's QuickBox2D class from the quickbox2D library
* @param e
*/
private function updateMouse(e:Event):void
{
if (_mouseJoint) {
var p2:b2Vec2=new b2Vec2(main.box2dMouseX,main.box2dMouseY);
_mouseJoint.SetTarget(p2);
}
}
}
