Box2dWeb Curves - SetAsEdge

[Bruno Gomes]

I create a function that create a curve (cubic bezier). Its ok, and works fine to me.

But i cant to set Fixture to this body, the edges.

<code>

function CreateCurve()

{

var bd = new b2BodyDef;

bd.type = b2Body.b2_staticBody;

var bdFix = new b2FixtureDef;

bdFix.density = 1.0;

bdFix.friction = 0.0;

bdFix.restitution = 0.0;

//console.log("x1: " + x1 + " y1: " + y1)

var pontoA = new b2Vec2( 0.0 , 0.5 );

var pontoB = new b2Vec2( 2.35 , 4.7 );

var pontoC = new b2Vec2( 7.05 , 4.7 );

var pontoD = new b2Vec2( 9.4 , 0.5 );

var x1 = pontoA.x;

var y1 = pontoA.y

var x2, y2;

var t; /* 0 para 1 */

//console.log(pontoA);

//console.log(pontoB);

//console.log(pontoC);

//console.log(pontoD);

bd.position.Set(x1, y1);

var curve = world.CreateBody(bd);

for( t = 0 ; t < 1.01 ; t += 0.01)

{

//var ax = ( -pontoA.x + 3*pontoB.x - 3*pontoC.x + pontoD.x ) / 6;

//var ay = ( -pontoA.y + 3*pontoB.y - 3*pontoC.y + pontoD.y ) / 6;

var ax = Math.pow((1-t), 3)*pontoA.x;

var ay = Math.pow((1-t), 3)*pontoA.y;;

//var bx = ( pontoA.x - 2*pontoB.x + pontoC.x ) / 2;

//var by = ( pontoA.y - 2*pontoB.y + pontoC.y ) / 2;

var bx = 3 * t * Math.pow((1-t), 2) * pontoB.x;

var by = 3 * t * Math.pow((1-t), 2) * pontoB.y;

//var cx = ( -pontoA.x + pontoC.x ) / 2;

//var cy = ( -pontoA.y + pontoC.y ) / 2;

var cx = 3 * Math.pow(t, 2) * (1-t) * pontoC.x;

var cy = 3 * Math.pow(t, 2) * (1-t) * pontoC.y;

//var dx = ( pontoA.x + 4*pontoB.x + pontoC.x ) / 6;

//var dy = ( pontoA.y + 4*pontoB.y + pontoC.y ) / 6;

var dx = Math.pow(t, 3) * pontoD.x;

var dy = Math.pow(t, 3) * pontoD.y;

//x2 = ax*Math.pow(t, 3) + bx*Math.pow(t, 2) + cx*t + dx;

//y2 = ay*Math.pow(t, 3) + by*Math.pow(t, 2) + cy*t + dy;

x2 = ax+bx+cx+dx;

y2 = ay+by+cy+dy;

//console.log("x2: " + x2 + " y2: " + y2);

var edgeShape = new b2PolygonShape();

edgeShape.SetAsEdge( new b2Vec2(x1,y1) , new b2Vec2(x2,y2) );

curve.CreateFixture2(edgeShape);

x1 = x2;

y1 = y2;

}

}

</code>