public IPhysicsBody CreateRectangleWall(int x, int y, int width, int height, ICollider userData)
{
var fixDef = new FixtureDef();
fixDef.density = 1;
fixDef.friction = 1;
fixDef.restitution = .6;
var bodyDef = new BodyDef();
bodyDef.type = BodyType.STATIC;
bodyDef.position.x = this.PixelToMeter(x) + this.PixelToMeter(width) / 2;
bodyDef.position.y = this.PixelToMeter(y) + this.PixelToMeter(height) / 2;
PolygonShape polyShape;
fixDef.shape = polyShape = new PolygonShape();
polyShape.setAsBox(this.PixelToMeter(width) / 2d, this.PixelToMeter(height) / 2d);
var body = this.World.createBody(bodyDef);
body.createFixture(fixDef);
body.setUserData(userData); return(new PhysicsBody(body));
}