private static bool IsAreaLocalDensityExceeded(
SpawnRequest spawnRequest,
ObjectSpawnPreset preset,
SpawnZoneArea area,
out double countToSpawnRemains)
{
var spawnedObjectsCount = area.WorldObjectsByPreset.Find(preset)?.Count ?? 0;
var desiredObjectsCountFloat = area.ZoneTilesCount * spawnRequest.Density;
var desiredObjectsCount = (int)Math.Round(desiredObjectsCountFloat, MidpointRounding.AwayFromZero);
if (desiredObjectsCount == 0 &&
preset.SpawnAtLeastOnePerSector &&
preset.PresetUseSectorDensity &&
desiredObjectsCountFloat > 0)
{
// spawn at least a single object
desiredObjectsCount = 1;
}
countToSpawnRemains = desiredObjectsCount - spawnedObjectsCount;
return(countToSpawnRemains <= 0);
}
private static bool ServerIsCanSpawn(
SpawnRequest spawnRequest,
ObjectSpawnPreset preset,
IReadOnlyDictionary <Vector2Ushort, SpawnZoneArea> spawnZoneAreas,
Vector2Ushort spawnPosition,
IPhysicsSpace physicsSpace,
out SpawnZoneArea resultSpawnArea,
out bool isSectorDensityExceeded)
{
if (ServerWorldService.GetTile(spawnPosition)
.IsCliffOrSlope)
{
// quick discard - don't spawn on cliff or slope
resultSpawnArea = null;
isSectorDensityExceeded = false;
return(false);
}
var presetPadding = preset.Padding;
var presetCustomObjectPadding = preset.CustomObjectPadding;
resultSpawnArea = null;
var resultSpawnAreaStartPosition = SpawnZoneArea.CalculateStartPosition(spawnPosition);
foreach (var area in EnumerateAdjacentZoneAreas(resultSpawnAreaStartPosition, spawnZoneAreas))
{
foreach (var nearbyPreset in area.WorldObjectsByPreset)
{
var nearbyObjectPreset = nearbyPreset.Key;
double padding;
if (nearbyObjectPreset != null)
{
// preset found
if (presetCustomObjectPadding.TryGetValue(nearbyObjectPreset, out padding))
{
// use custom padding value
}
else
{
// don't have custom padding
padding = Math.Max(presetPadding, nearbyObjectPreset.Padding);
}
}
else
{
// preset of another object not defined in this spawn list - use default object spawn padding
padding = DefaultObjectSpawnPadding;
}
foreach (var nearbyObjectTilePosition in nearbyPreset.Value)
{
var distance = spawnPosition.TileSqrDistanceTo(nearbyObjectTilePosition);
// Actually using < will be more correct, but it will produce not so nice-looking result
// (objects could touch each other on each side).
// So we insist objects must don't even touch each other on their
// left/up/right/down edges (but the diagonal corners touch is ok).
if (distance <= padding * padding)
{
// too close
isSectorDensityExceeded = false;
return(false);
}
}
}
if (resultSpawnAreaStartPosition == area.StartPosition)
{
resultSpawnArea = area;
}
}
var needToCheckLandClaimPresence = true;
if (preset.IsContainsOnlyStaticObjects)
{
needToCheckLandClaimPresence = !ServerWorldService.GetTile(spawnPosition)
.ProtoTile
.IsRestrictingConstruction;
}
if (needToCheckLandClaimPresence &&
ServerCheckLandClaimAreaPresence(spawnPosition, preset.PaddingToLandClaimAreas))
{
// the land is claimed by players
resultSpawnArea = null;
isSectorDensityExceeded = false;
return(false);
}
if (preset.CustomCanSpawnCheckCallback != null &&
!preset.CustomCanSpawnCheckCallback(physicsSpace, spawnPosition))
{
// custom spawn check failed
resultSpawnArea = null;
isSectorDensityExceeded = false;
return(false);
}
if (resultSpawnArea == null)
{
// no area exist (will be created)
isSectorDensityExceeded = false;
return(true);
}
if (!spawnRequest.UseSectorDensity)
{
isSectorDensityExceeded = false;
return(true);
}
// ensure that the area/sector density is not exceeded for this spawn preset
isSectorDensityExceeded = IsAreaLocalDensityExceeded(spawnRequest,
preset,
resultSpawnArea,
out var countToSpawnRemains);
if (isSectorDensityExceeded)
{
// already spawned too many objects of the required type in the area
return(false);
}
if (countToSpawnRemains < 1)
{
// density allows to spawn an extra object of this type with some small probability
if (!RandomHelper.RollWithProbability(countToSpawnRemains))
{
return(false);
}
}
return(true);
}
