private void DigRiverGroups()
{
for (int i = 0; i < RiverGroups.Count; i++)
{
RiverGroup group = RiverGroups[i];
River longest = null;
//Find longest river in this group
for (int j = 0; j < group.Rivers.Count; j++)
{
River river = group.Rivers[j];
if (longest == null)
{
longest = river;
}
else if (longest.Tiles.Count < river.Tiles.Count)
{
longest = river;
}
}
if (longest != null)
{
//Dig out longest path first
DigRiver(longest);
for (int j = 0; j < group.Rivers.Count; j++)
{
River river = group.Rivers[j];
if (river != longest)
{
DigRiver(river, longest);
}
}
}
}
}
private void BuildRiverGroups()
{
//loop each tile, checking if it belongs to multiple rivers
for (var x = 0; x < Width; x++)
{
for (var y = 0; y < Height; y++)
{
Tile t = Tiles[x, y];
if (t.Rivers.Count > 1)
{
// multiple rivers == intersection
RiverGroup group = null;
// Does a rivergroup already exist for this group?
for (int n = 0; n < t.Rivers.Count; n++)
{
River tileriver = t.Rivers[n];
for (int i = 0; i < RiverGroups.Count; i++)
{
for (int j = 0; j < RiverGroups[i].Rivers.Count; j++)
{
River river = RiverGroups[i].Rivers[j];
if (river.ID == tileriver.ID)
{
group = RiverGroups[i];
}
if (group != null)
{
break;
}
}
if (group != null)
{
break;
}
}
if (group != null)
{
break;
}
}
// existing group found -- add to it
if (group != null)
{
for (int n = 0; n < t.Rivers.Count; n++)
{
if (!group.Rivers.Contains(t.Rivers[n]))
{
group.Rivers.Add(t.Rivers[n]);
}
}
}
else //No existing group found - create a new one
{
group = new RiverGroup();
for (int n = 0; n < t.Rivers.Count; n++)
{
group.Rivers.Add(t.Rivers[n]);
}
RiverGroups.Add(group);
}
}
}
}
}