25   // the x interval between each object is 5 meters

    25   // the x interval between each object is 5 meters

    26   // and the y interval between each object is 20 meters

    26   // and the y interval between each object is 20 meters

    27   GridTopology grid (-100, -100, 20, 5, 20);

    27   GridTopology grid (-100, -100, 20, 5, 20);

    28 

    28 

    29   // each object will be attached a static position.

    29   // each object will be attached a static position.

    31 

    31 

    32   // finalize the setup by attaching to each object

    32   // finalize the setup by attaching to each object

    33   // in the input array a position and initializing

    33   // in the input array a position and initializing

    34   // this position with the calculated coordinates.

    34   // this position with the calculated coordinates.

    35   grid.LayoutRowFirst (nodes.begin (), nodes.end ());

    35   grid.LayoutRowFirst (nodes.begin (), nodes.end ());