public TreeGenForClimate GetRandomGenForClimate(TreeVariant[] gens, int climate, int forest, int y)
{
int rain = TerraGenConfig.GetRainFall((climate >> 8) & 0xff, y);
int temp = TerraGenConfig.GetScaledAdjustedTemperature((climate >> 16) & 0xff, y - TerraGenConfig.seaLevel);
float heightRel = ((float)y - TerraGenConfig.seaLevel) / ((float)api.WorldManager.MapSizeY - TerraGenConfig.seaLevel);
int fertility = TerraGenConfig.GetFertility(rain, temp, heightRel);
float total = 0;
float fertDist, rainDist, tempDist, forestDist, heightDist;
distances.Clear();
for (int i = 0; i < gens.Length; i++)
{
TreeVariant variant = gens[i];
fertDist = Math.Abs(fertility - variant.FertMid) / variant.FertRange;
rainDist = Math.Abs(rain - variant.RainMid) / variant.RainRange;
tempDist = Math.Abs(temp - variant.TempMid) / variant.TempRange;
forestDist = Math.Abs(forest - variant.ForestMid) / variant.ForestRange;
heightDist = Math.Abs((y / worldheight) - variant.HeightMid) / variant.HeightRange;
double distSq =
Math.Max(0, fertDist * fertDist - 1) +
Math.Max(0, rainDist * rainDist - 1) +
Math.Max(0, tempDist * tempDist - 1) +
Math.Max(0, forestDist * forestDist - 1) +
Math.Max(0, heightDist * heightDist - 1)
;
if (random.NextDouble() < distSq)
{
continue;
}
float distance = (fertDist + rainDist + tempDist + forestDist + heightDist) * variant.Weight / 100f;
distances.Add(variant, distance);
total += distance;
}
distances = distances.Shuffle(random);
double rnd = random.NextDouble();
foreach (var val in distances)
{
rnd -= val.Value / total;
if (rnd <= 0.001)
{
float suitabilityBonus = GameMath.Clamp(0.7f - val.Value, 0f, 0.7f) * 1 / 0.7f * val.Key.SuitabilitySizeBonus;
float size = val.Key.MinSize + (float)random.NextDouble() * (val.Key.MaxSize - val.Key.MinSize) + suitabilityBonus;
float rainVal = Math.Max(0, (rain / 255f - treeGenProps.vinesMinRain) / (1 - treeGenProps.vinesMinRain));
float tempVal = Math.Max(0, (TerraGenConfig.DescaleTemperature(temp) / 255f - treeGenProps.descVineMinTempRel) / (1 - treeGenProps.descVineMinTempRel));
float vinesGrowthChance = 2f * rainVal * tempVal;
ITreeGenerator treegen = treeGenerators.GetGenerator(val.Key.Generator);
if (treegen == null)
{
api.World.Logger.Error("treengenproperties.json references tree generator {0}, but no such generator exists!", val.Key.Generator);
return(null);
}
return(new TreeGenForClimate(treegen, size, vinesGrowthChance));
}
}
return(null);
}
