/**
* <summary>
* Layered expansion method. Basically just repeats an expansion using
* the given HexExpander for the given number of passes. On each pass,
* the number of hexes that will be modified is reduced by a random
* amount between the two proportion bounds of this class.
* </summary>
* <param name="passes">Number of expansion passes.</param>
*/
public void Expand(int passes)
{
int hexesToModify = ValidCoords.Count;
for (int i = 0; i < passes; i++)
{
double proportionThisRound = _rand.GenerateDouble();
proportionThisRound *= (UpperProportionBound - LowerProportionBound);
proportionThisRound += LowerProportionBound;
hexesToModify = (int)(hexesToModify * proportionThisRound);
Expander.Expand(ValidCoords, hexesToModify);
}
}
/** <summary>
* Generates a modifier to add onto the base roll, used to determine the number of sides
* to expand out to from a starting hex.
* </summary>
* <remarks>
* This modifier is random, but will likely be higher when there are more hexes that
* have not yet been expanded to. This is done to favour a more blob-shaped core with
* branches/peninsulae as generation goes on.
* </remarks>
* <returns>A modifier not exceeding Hex.SIDES, likely higher when there are more hexes
* that have not yet been placed.</returns>
*/
protected virtual int RollModifier()
{
double ratio = _remainingHexes / _totalHexes;
int mod = 0;
while ((mod < Hex.SIDES) &&
(ratio > 0))
{
double comp = _rand.GenerateDouble();
if (comp <= ratio)
{
mod++;
ratio /= 2;
}
else
{
break;
}
}
return(mod);
}
private void FillLandmass(Landmass mass)
{
// Elevation
// Pick a number of passes; a range of the total number of
// elements in the enum works best
int passes = _rand.GenerateInt(1, 5);
List <Coords> eleHexes = new List <Coords>(mass.Hexes);
HeightExpander hEx = new HeightExpander(_rand, _world.Map);
LayeredExpansion layered = new LayeredExpansion(_rand, hEx, eleHexes, 0.6, 0.8);
layered.Expand(passes);
// Rivers
int totalRiverHexes = mass.TotalHexes / 20;
int remainingHexes = totalRiverHexes;
while (remainingHexes > 0)
{
if (remainingHexes == 1)
{
break;
}
int riverLength = _rand.GenerateInt(2, remainingHexes);
RiverGen rgen = new RiverGen(_rand, _world, mass, riverLength);
int genLength = rgen.Generate();
if (genLength > 1)
{
remainingHexes -= genLength;
rgen.Commit();
_world.Rivers.Add(rgen.GenRiver);
}
}
// Temperature
SetTemperatures();
// Humidity
passes = _rand.GenerateInt(1, 5);
List <Coords> humiHexes = new List <Coords>(mass.Hexes);
HumidityExpander humEx = new HumidityExpander(_rand, _world.Map);
layered = new LayeredExpansion(_rand, humEx, humiHexes, 0.6, 0.8);
layered.Expand(passes);
// Biomes
BiomeExpander bioEx;
List <Coords> bioHexes = new List <Coords>(mass.Hexes);
int tenPercent = mass.TotalHexes / 10;
while (bioHexes.Count > 0)
{
int expandThisRound = bioHexes.Count;
if (expandThisRound > tenPercent)
{
double fraction = _rand.GenerateDouble() / 2.0;
expandThisRound = (int)(expandThisRound * fraction);
}
bioEx = new BiomeExpander(_rand, _world.Map, _world.Biomes);
var placedCoords = bioEx.Expand(bioHexes, expandThisRound);
bioHexes.RemoveAll(x => placedCoords.Contains(x));
}
}