[NaS]

You must save the first pair of coordinates in a global array, or a PVar. In this case I'd prefer a PVar since only admins use this command probably, and in that case a global array would be 99% unused most of the time.

In the first step you can save the X and Y coord into a PVar like this:

Code:

SetPVarFloat(playerid, "ZoneCreateMinX", xc);
SetPVarFloat(playerid, "ZoneCreateMinY", yc);

In the second step you can get the coords with GetPVarFloat:

Code:

minx = GetPVarFloat(playerid, "ZoneCreateMinX");
miny = GetPVarFloat(playerid, "ZoneCreateMinY");

And use the coords from GetPlayerPos for MaxX and MaxY.

Z is not needed in most cases, but if you need it you can easily add that too.

Hope I got you right.