Point2f v0 = el.getNode(0).getPoint2f();
Point2f v1 = el.getNode(1).getPoint2f();
Point2f v2 = el.getNode(2).getPoint2f();
v1.sub(v0); // from node 0 to 1
v2.sub(v0); // from node 0 to 2
float cross = v1.x*v2.y - v1.y*v2.x;
if(cross < 0){
el.reorient();