GetObs

Returns the index of the obstruction tile at the given coords.

Note: Coordinates are in terms of tiles, not pixels. In order to convert tiles to pixels do, (pixel coordinate / 16).

// Imagine the following 3 by 3 grid is your map.

//    0 1 2
//
// 0  0 0 0
// 1  0 1 1
// 2  0 0 1

GetObs(0, 0); // Returns 0.
GetObs(1, 1); // Returns 1.
GetObs(2, 2); // Returns 1.
GetObs(2, 0); // Returns 0.