/*
-4 -3 -2 -1 00 01 02 03 04 05 ->>> x
-4 xx xx xx xx xx xx xx xx xx xx
-3 xx xx
-2 xx xx
-1 xx xx xx xx xx xx
00 xx xx 18 1A xx xx
01 xx xx 18 1B xx xx
02 xx xx 19 1C xx xx
03 xx xx xx xx xx xx
04 xx xx
05 xx xx
06 xx xx xx xx xx xx xx xx xx xx
^
^
|
y
switch (FEAT_INDUSTRIES, SELF, oil_rig_location_callback, industry_distance(INDUSTRYTYPE_OIL_RIG, -1) ) {
0..6: CB_RESULT_LOCATION_DISALLOW;
CB_RESULT_LOCATION_ALLOW;
}
*/