mouseJoint box2dweb不工作

Question

我试图用鼠标捕捉对象。因为我是个傻瓜，所以偷了密码。但不管是我还是我都没用。

我发现了这个错误：

Uncaught : Object #< ba >没有方法'IsActive‘Box2dWeb-2.1.a.3.min.js:236 Uncaught : Object #< ba >没有方法'SetAwake’Box2dWeb2.1.a.3.min.js:223

以下是代码：

var def = new b2MouseJointDef();

            def.bodyA = ground;
            def.bodyB = body;
            def.target = p;

            def.collideConnected = true;
            def.maxForce = 1000 * body.GetMass();
            def.dampingRatio = 0;

            mouse_joint = world.CreateJoint(def);

            body.SetAwake(true);

这就是身体

function createBox(world, x, y, width, height, options) {
options = $.extend(true, {
    'density' : 1.0 ,
    'friction' : 1.0 ,
    'restitution' : 0.5 ,

    'linearDamping' : 0.0 ,
    'angularDamping' : 0.0 ,

    'type' : b2Body.b2_dynamicBody
}, options);

var body_def = new b2BodyDef();
var fix_def = new b2FixtureDef();

fix_def.density = options.density;
fix_def.friction = options.friction;
fix_def.restitution = options.restitution;

fix_def.shape = new b2PolygonShape();

fix_def.shape.SetAsBox( width , height );

body_def.position.Set(x , y);

body_def.linearDamping = options.linearDamping;
body_def.angularDamping = options.angularDamping;

body_def.type = options.type;
body_def.userData = options.user_data;

var b = world.CreateBody( body_def );
var f = b.CreateFixture(fix_def);

return b;

}

也许有人能帮忙？

福克

Answer 1

我可以回答一半的问题：

如果我用

ground = createBox(world, 4, 1, 4 , 0.5, {type : b2Body.b2_staticBody});

与此函数相反: var bodyDef =新的b2BodyDef()；

var fixDef = new b2FixtureDef();
fixDef.density = 1.0;
fixDef.friction = 1.0;
fixDef.restitution = 0.5;

fixDef.shape = new b2PolygonShape;

//mention half the sizes
fixDef.shape.SetAsBox(4.00 , .5);

//set the position of the center
bodyDef.position.Set(4.10 , 1);

return world.CreateBody(bodyDef).CreateFixture(fixDef);

那它就起作用了。但是为什么呢？