box2d之使用b2DistanceJoint
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// 代码和前面的例子一样, 只是加了四句
/* :
a : var the_joint:b2DistanceJointDef = new b2DistanceJointDef();
b : the_joint.Initialize(circle, box, new b2Vec2(6,2),new b2Vec2(2,2));
c : the_joint.collideConnected = true;
d : var joint:b2DistanceJoint = m_world.CreateJoint(the_joint)as b2DistanceJoint;
其实Createjoint() CreateShape() CreateBody() 的本质就是和addChild()一样 在box2d的以前的版本中 就是用的addShape() 等
*/
package {
import flash.display.Sprite;
import flash.events.Event;
import Box2D.Dynamics.*;
import Box2D.Collision.*;
import Box2D.Collision.Shapes.*;
import Box2D.Common.Math.*;
import Box2D.Dynamics.Joints.*;
import flash.events.MouseEvent;
public class distance_joint extends Sprite {
var mouseJoint:b2MouseJoint;
var mousePVec:b2Vec2 = new b2Vec2();
var bd:b2BodyDef;
var the_circle:b2CircleDef = new b2CircleDef();
var the_box:b2PolygonDef = new b2PolygonDef();
var the_joint:b2DistanceJointDef = new b2DistanceJointDef();
public function distance_joint() {
// world setup
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);
// debug draw
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|b2DebugDraw.e_jointBit;
m_world.SetDebugDraw(dbgDraw);
// ground
the_box.SetAsBox(9,0.5);
the_box.density = 0;
the_box.friction = 0.4;
the_box.restitution = 0.1;
bd = new b2BodyDef();
bd.position.Set(8.5, 13);
var ground:b2Body = m_world.CreateBody(bd);
ground.CreateShape(the_box);
ground.SetMassFromShapes();
// circle
the_circle.radius = 2;
the_circle.density = 1.0;
the_circle.friction = 0.4;
the_circle.restitution = 0.3;
bd = new b2BodyDef();
bd.position.Set(6, 2);
var circle:b2Body = m_world.CreateBody(bd);
circle.CreateShape(the_circle);
circle.SetMassFromShapes();
// square
the_box.SetAsBox(1.5,1.5);
the_box.density = 1.0;
the_box.friction = 0.4;
the_box.restitution = 0.1;
bd = new b2BodyDef();
bd.position.Set(2, 2);
var box:b2Body = m_world.CreateBody(bd);
box.CreateShape(the_box);
box.SetMassFromShapes();
// joint
the_joint.Initialize(circle, box, new b2Vec2(6,2),new b2Vec2(2,2));
//下一句是为说明连接的两个物体可以进行碰撞,设为false则为可以重叠,不能进行碰撞,即其可以相互穿过而没有阻碍
the_joint.collideConnected = true;
var joint:b2DistanceJoint = m_world.CreateJoint(the_joint)as b2DistanceJoint;
// listeners
stage.addEventListener(MouseEvent.MOUSE_DOWN, createMouse);
stage.addEventListener(MouseEvent.MOUSE_UP, destroyMouse);
addEventListener(Event.ENTER_FRAME, Update, false, 0, true);
}
public function createMouse(evt:MouseEvent):void {
var body:b2Body=GetBodyAtMouse();
if (body) {
var mouseJointDef:b2MouseJointDef=new b2MouseJointDef;
mouseJointDef.body1=m_world.GetGroundBody();
mouseJointDef.body2=body;
mouseJointDef.target.Set(mouseX/30, mouseY/30);
mouseJointDef.maxForce=30000;
mouseJointDef.timeStep=m_timeStep;
mouseJoint=m_world.CreateJoint(mouseJointDef) as b2MouseJoint;
}
}
public function destroyMouse(evt:MouseEvent):void {
if (mouseJoint) {
m_world.DestroyJoint(mouseJoint);
mouseJoint=null;
}
}
public function GetBodyAtMouse(includeStatic:Boolean=false):b2Body {
var mouseXWorldPhys = (mouseX)/30;
var mouseYWorldPhys = (mouseY)/30;
mousePVec.Set(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=m_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;
}
public function Update(e:Event):void {
m_world.Step(m_timeStep, m_iterations);
if (mouseJoint) {
var mouseXWorldPhys=mouseX/30;
var mouseYWorldPhys=mouseY/30;
var p2:b2Vec2=new b2Vec2(mouseXWorldPhys,mouseYWorldPhys);
mouseJoint.SetTarget(p2);
}
}
public var m_world:b2World;
public var m_iterations:int=10;
public var m_timeStep:Number=1.0/30.0;
}
}
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