private void CreateStem()
{
AddBranch = true;
AABB aabb = new AABB(); body.GetFixtureList().GetAABB(out aabb);
Vector2 v = aabb.GetCenter() + new Vector2(0, 15);
Path2D p = new Path2D();
p.AddPoint(v); p.AddPoint(v + new Vector2(0, -10));
stem = new Branch(p, gameContent, body.GetWorld(), null);
RevoluteJointDef revJd = new RevoluteJointDef();
revJd.bodyA = stem.body;
revJd.bodyB = ground;
revJd.collideConnected = true;
revJd.localAnchorA = Vector2.Zero;
revJd.localAnchorB = stem.body.Position;
revJd.enableMotor = true;
stem.revoJoint = (RevoluteJoint)world.CreateJoint(revJd);
// A Small rotation sets the body in motion
stem.body.Rotation = (float)Math.PI / 360;
}
