// x coordinate of the first, bottom left grid center point
_startx=2500;
// y coordinate of the first, bottom left grid center point
_starty=2800;
// gridsize x (how many single squares in the grid) for the x-axis
_gridsize_x=6;
// gridsize y (how many single squares in the grid) for the y-axis
_gridsize_y=6;
// distance from the center of one square of the grid to the border of that square. so overall size of a square in the grid is 2x gridwidth / 2x gridwidth