box2d的角色邹形

demo : http://www.emanueleferonato.com/downloads/box2dplat3.swf

demo控制左右键是左右移动上方向键是起跳

下面是源码：

box2d是的角色邹形能跳能移动能发射东西

/*
知识补漏：

world其本质也是个body, 即所有b2Body对象的parent 。CreateBody() 等一些Create ， Create就相当于flash player里的 add ， CreateBody() CreateShape（）就相当于flash player里的 addChild()

ground_sensor.SetAsOrientedBox(10/pixels_in_a_meter,5/pixels_in_a_meter,new b2Vec2(0,27/pixels_in_a_meter), 0);
后面的坐标new b2Vec2(0,27/pixels_in_a_meter)其原点是body的中心（即以body的中心为原点），而不是以world中的原点为原点，
（总结：以body的中心为原点,向右向下为xy轴的正方向）
GetWorldCenter得到是整个body的中心,GetLocalCenter得到是SetAsBox() 这个组成的对象的中心

下面增加了b2ContactListene类进行了侦听，并对其进行了重写..

package {
import flash.display.Sprite;
import flash.events.Event;
import Box2D.Dynamics.*;
import Box2D.Collision.*;
import Box2D.Collision.Shapes.*;
import Box2D.Common.Math.*;
import General.Input;
import flash.events.MouseEvent;
public class HelloWorld extends Sprite {
  public var m_world:b2World;
  public var pixels_in_a_meter:int=30;
  public var bodyDef:b2BodyDef;
  public var boxDef:b2PolygonDef;
  public var m_input:Input;
  public var xspeed:int=0;
  public var bazooka:zooka=new zooka();
  public var bazooka_angle:Number;
  public var m_contactListener=new b2ContactListener();
  var body:b2Body;
  public function HelloWorld() {
   addEventListener(Event.ENTER_FRAME, Update, false, 0, true);
   var worldAABB:b2AABB = new b2AABB();
   worldAABB.lowerBound.Set(-100.0, -100.0);
   worldAABB.upperBound.Set(100.0, 100.0);
   var gravity:b2Vec2=new b2Vec2(0.0,10.0);
   var doSleep:Boolean=true;
   m_world=new b2World(worldAABB,gravity,doSleep);
   var m_sprite:Sprite;
   m_sprite = new Sprite();
   addChild(m_sprite);
   var dbgDraw:b2DebugDraw = new b2DebugDraw();
   var dbgSprite:Sprite = new Sprite();
   m_sprite.addChild(dbgSprite);
   dbgDraw.m_sprite=m_sprite;
   dbgDraw.m_drawScale=30;
   dbgDraw.m_alpha=1;
   dbgDraw.m_fillAlpha=0.5;
   dbgDraw.m_lineThickness=1;
   dbgDraw.m_drawFlags=b2DebugDraw.e_shapeBit;
   m_world.SetDebugDraw(dbgDraw);
   var bodyDef:b2BodyDef;
   var boxDef:b2PolygonDef;
   var circleDef:b2CircleDef;
   square_tile(250,395,500,10);
   hero(100,370,20,40);
   //
   // adding the contact listener
   m_world.SetContactListener(m_contactListener);
   //
   // Box2D input class - why should I bother making my one?
   m_sprite = new Sprite();
   addChild(m_sprite);
   // input
   m_input=new Input(m_sprite);
   addChild(bazooka);
   stage.addEventListener(MouseEvent.CLICK, shoot);
  }
  public function shoot(event:Event) {
   bodyDef = new b2BodyDef();
   bodyDef.position.Set((bazooka.x+(bazooka.width+3)*Math.cos(bazooka_angle))/pixels_in_a_meter, (bazooka.y+(bazooka.width+3)*Math.sin(bazooka_angle))/pixels_in_a_meter);
   boxDef = new b2PolygonDef();
   boxDef.SetAsBox(10/pixels_in_a_meter,10/pixels_in_a_meter);
   boxDef.friction=0.3;
   boxDef.density=1;
   body=m_world.CreateBody(bodyDef);
   body.CreateShape(boxDef);
   body.SetMassFromShapes();
   body.ApplyImpulse(new b2Vec2(Math.cos(bazooka_angle)*4, Math.sin(bazooka_angle)*4),body.GetWorldCenter());
  }
  public function square_tile(px:int,py:int,w:int,h:int) {
   bodyDef = new b2BodyDef();
   bodyDef.position.Set(px/pixels_in_a_meter, py/pixels_in_a_meter);
   boxDef = new b2PolygonDef();
   boxDef.SetAsBox(real_pixels(w), real_pixels(h));
   boxDef.friction=0.3;
   boxDef.density=0;
   body=m_world.CreateBody(bodyDef);
   body.CreateShape(boxDef);
   body.SetMassFromShapes();
  }
  public function hero(px:int, py:int, w:int, h:int) {
   bodyDef = new b2BodyDef();
   bodyDef.position.Set(px/pixels_in_a_meter, py/pixels_in_a_meter);
   boxDef = new b2PolygonDef();
   boxDef.SetAsBox(real_pixels(w), real_pixels(h));
   boxDef.density=1.0;
   boxDef.friction=0.3;
   boxDef.restitution=0.2;
   bodyDef.userData = new Sprite();
   bodyDef.userData.name="Player";
   body=m_world.CreateBody(bodyDef);
   body.SetBullet(true);
   body.CreateShape(boxDef);
   //
   var ground_sensor:b2PolygonDef = new b2PolygonDef();
   ground_sensor.isSensor=true;
   ground_sensor.userData="groundsensor";
   ground_sensor.SetAsOrientedBox(10/pixels_in_a_meter,5/pixels_in_a_meter,new b2Vec2(0,27/pixels_in_a_meter), 0);//后面的坐标new b2Vec2(0,27/pixels_in_a_meter)其原点是body的中心（即以body的中心为原点），而不是以world中的原点为原点，（总结：以body的中心为原点,向右向下为xy轴的正方向）
   body.CreateShape(ground_sensor);
   //
   body.SetMassFromShapes();
  }
  public function real_pixels(n:int) {
   return (n/pixels_in_a_meter/2);
  }
  public function Update(e:Event):void {
   m_world.Step(1/30, 10);
   xspeed=0;
   for (var bb:b2Body = m_world.m_bodyList; bb; bb = bb.m_next) {
    if (bb.GetUserData()!=null) {
     if (Input.isKeyDown(39)) { // right arrow
      xspeed=3;
     } else if (Input.isKeyDown(37)) { // left arrow
      xspeed=-3;
     }
     if (Input.isKeyDown(38)) {// up arrow
      if (m_contactListener.can_jump()) { // checking if the hero can jump
       bb.ApplyImpulse(new b2Vec2(0.0, -1.0), bb.GetWorldCenter());//这里用bb.GetWorldCenter(),而不用bb.GetLocalCenter()因为用GetLocalCenter容易引起bug
      }
     }
     if (xspeed) {
      bb.WakeUp();
      bb.m_linearVelocity.x=xspeed;
     }
     bb.m_sweep.a=0;
     bazooka.x=bb.m_userData.x=bb.GetPosition().x*30;
     bazooka.y=bb.m_userData.y=bb.GetPosition().y*30;
     var dist_x=bazooka.x-mouseX;
     var dist_y=bazooka.y-mouseY;
     bazooka_angle=Math.atan2(- dist_y,- dist_x);
     bazooka.rotation=bazooka_angle*57.2957795;
    }
   }
   Input.update();
  }
}
}

b2ContactListener类的重写：

/*
* Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/

package Box2D.Dynamics{

import Box2D.Collision.*;
import Box2D.Collision.Shapes.*;
import Box2D.Dynamics.Contacts.*;
import Box2D.Dynamics.*;
import Box2D.Common.Math.*;
import Box2D.Common.*;

/// Implement this class to get collision results. You can use these results for
/// things like sounds and game logic. You can also get contact results by
/// traversing the contact lists after the time step. However, you might miss
/// some contacts because continuous physics leads to sub-stepping.
/// Additionally you may receive multiple callbacks for the same contact in a
/// single time step.
/// You should strive to make your callbacks efficient because there may be
/// many callbacks per time step.
/// @warning The contact separation is the last computed value.
/// @warning You cannot create/destroy Box2D entities inside these callbacks.

public class b2ContactListener {
  var canjump:Boolean=false;
  /// Called when a contact point is added. This includes the geometry
  /// and the forces.

  public function can_jump() {
   return (canjump);
  }

  public virtual function Add(point:b2ContactPoint):void {}

  /// Called when a contact point persists. This includes the geometry
  /// and the forces.
  //点持续接触时
  public virtual function Persist(point:b2ContactPoint):void {
   if (point.shape1.GetUserData()=="groundsensor"||point.shape2.GetUserData()=="groundsensor") {
    canjump=true;
   }
  }

  /// Called when a contact point is removed. This includes the last
  /// computed geometry and forces.
  public virtual function Remove(point:b2ContactPoint):void {
   if (point.shape1.GetUserData()=="groundsensor"||point.shape2.GetUserData()=="groundsensor") {
    canjump=false;
   }
  }

  /// Called after a contact point is solved.
  public virtual function Result(point:b2ContactResult):void {
  }

}

}

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