printf(" dist center - Node k %f\n",sqrt((world->nodes[k].position.x-xm)*(world->nodes[k].position.x-xm)+(world->nodes[k].position.y-ym)*(world->nodes[k].position.y-ym)));
printf(" dist center - Node k %f\n",sqrt((world->nodes[k].position.x-xm)*(world->nodes[k].position.x-xm)+(world->nodes[k].position.y-ym)*(world->nodes[k].position.y-ym)));