private static bool ValidCoordinates( int x, int y )
{
// Our coordinates are constrained between 0 and 14.
if ( x < 0 ) { return false; }
if ( y < 0 ) { return false; }
if ( x > MeshBoard.WIDTH-1 ) { return false; }
if ( y > MeshBoard.HEIGHT-1 ) { return false; }
return true;
}