private int CreateRiver(HexCell origin)
{
int length = 1;
HexCell cell = origin;
HexDirection direction = HexDirection.NE;
while (!cell.IsUnderwater)
{
int minNeighborElevation = int.MaxValue;
flowDirections.Clear();
for (HexDirection d = HexDirection.NE; d <= HexDirection.NW; d++)
{
HexCell neighbor = cell.GetNeighbor(d);
if (!neighbor)
{
continue;
}
if (neighbor.Elevation < minNeighborElevation)
{
minNeighborElevation = neighbor.Elevation;
}
if (neighbor == origin || neighbor.HasIncomingRiver)
{
continue;
}
int delta = neighbor.Elevation - cell.Elevation;
if (delta > 0)
{
continue;
}
if (neighbor.HasOutgoingRiver)
{
cell.SetOutgoingRiver(d);
return(length);
}
if (delta < 0)
{
flowDirections.Add(d);
flowDirections.Add(d);
flowDirections.Add(d);
}
if (length == 1 ||
(d != direction.Next2() && d != direction.Previous2()))
{
flowDirections.Add(d);
}
flowDirections.Add(d);
}
if (flowDirections.Count == 0)
{
if (length == 1)
{
return(0);
}
if (minNeighborElevation >= cell.Elevation)
{
cell.WaterLevel = minNeighborElevation;
if (minNeighborElevation >= cell.Elevation &&
Random.value < extraLakeProbability)
{
cell.WaterLevel = cell.Elevation;
cell.Elevation -= 1;
}
}
break;
}
direction = flowDirections[Random.Range(0, flowDirections.Count)];
cell.SetOutgoingRiver(direction);
length += 1;
if (minNeighborElevation >= cell.Elevation)
{
cell.WaterLevel = cell.Elevation;
cell.Elevation -= 1;
}
cell = cell.GetNeighbor(direction);
}
return(length);
}
void EditCell(HexCell cell)
{
if (cell)
{
if (activeTerrainTypeIndex >= 0)
{
cell.TerrainTypeIndex = activeTerrainTypeIndex;
}
if (applyElevation)
{
cell.Elevation = activeElevation;
}
if (applyWaterLevel)
{
cell.WaterLevel = activeWaterLevel;
}
if (riverMode == OptionalToggle.No)
{
cell.RemoveRiver();
}
if (roadMode == OptionalToggle.No)
{
cell.RemoveRoads();
}
if (applyUrbanLevel)
{
cell.UrbanLevel = activeUrbanLevel;
}
if (applyFarmLevel)
{
cell.FarmLevel = activeFarmLevel;
}
if (applyPlantLevel)
{
cell.PlantLevel = activePlantLevel;
}
if (walledMode != OptionalToggle.Ignore)
{
cell.Walled = walledMode == OptionalToggle.Yes;
}
if (applySpecialIndex)
{
cell.SpecialIndex = activeSpecialIndex;
}
if (isDrag)
{
HexCell otherCell = cell.GetNeighbor(dragDirection.Opposite());
if (otherCell)
{
if (riverMode == OptionalToggle.Yes)
{
otherCell.SetOutgoingRiver(dragDirection);
}
if (roadMode == OptionalToggle.Yes)
{
otherCell.AddRoad(dragDirection);
}
}
}
}
}