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bug #20825: Problems in Problems in server/generator/mapgen.c: part 2, size limits in make_island().

Submitted by:  Micke <mss_8734>
Submitted on:  Fri May 17 17:59:26 2013  
Category: generalSeverity: 2 - Minor
Priority: 5 - NormalStatus: None
Assigned to: NoneOpen/Closed: Open
Release: 2.6Operating System: Any
Planned Release: Contains string changes: None

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Fri May 17 17:59:26 2013, original submission:

Problem 2>
On lines 2197 - 2200 we have:
if (islemass > lastplaced + 1 + lastplaced / 50) {
/* don't create big isles we can't place */
islemass = lastplaced + 1 + lastplaced / 50;

First, it seems odd to just assume an increase > 2% would always fail, regardless of available map space and landmass. For small islands even an attempted increment by 2 will be thwarted by this; attempting to create several islands with a random size in even such a small range as [2,10] will be seriously affected.
Second, this check is then followed by tests against the map size and size <= 0, but not against available landmass. This looks particularly odd.
Third, the function keeps decreasing the size until an island can be created or it reaches a lower limit supplied by the caller, which seems to make at least some of the above tests seem redundant.
Last and quite possibly least, I think this ought to be mentioned in the function summary; currently it only says one has to ‘create big islands first’, which would be logical even without the 2% hard limit.

Micke <mss_8734>


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