draw_set_color(c_white);
var i, j;
for (i=0; i<array_length(global.map); i++) {
	for (j=0; j<array_length(global.map[i]); j++) {
		draw_rectangle(
			i*global.tilesize.x,
			j*global.tilesize.y,
			(i+1)*global.tilesize.x,
			(j+1)*global.tilesize.y, false
		);
	}
}
draw_set_color(c_black);
var i, j;
for (i=0; i<array_length(global.map); i++) {
	for (j=0; j<array_length(global.map[i]); j++) {
		draw_rectangle(
			i*global.tilesize.x,
			j*global.tilesize.y,
			(i+1)*global.tilesize.x-1,
			(j+1)*global.tilesize.y-1, true
		);
	}
}