private void SetRiverTile(River river)
{
SetRiverPath(river);
HeightType = HeightType.River;
HeightValue = 0;
Collidable = false;
}
private void GenerateRivers()
{
int attempts = 0;
int rivercount = RiverCount;
Rivers = new List <River>();
// Generate some rivers
while (rivercount > 0 && attempts < MaxRiverAttempts)
{
// Get a random tile
int x = Random.Next(0, Width);
int y = Random.Next(0, Height);
Tile tile = Tiles[x, y];
// validate the tile
if (!tile.Collidable)
{
continue;
}
if (tile.Rivers.Count > 0)
{
continue;
}
if (tile.HeightValue > MinRiverHeight)
{
// Tile is good to start river from
River river = new River(rivercount);
// Figure out the direction this river will try to flow
river.CurrentDirection = tile.GetLowestNeighbor();
// Recursively find a path to water
FindPathToWater(tile, river.CurrentDirection, ref river);
// Validate the generated river
if (river.TurnCount < MinRiverTurns || river.Tiles.Count < MinRiverLength || river.Intersections > MaxRiverIntersections)
{
//Validation failed - remove this river
for (int i = 0; i < river.Tiles.Count; i++)
{
Tile t = river.Tiles[i];
t.Rivers.Remove(river);
}
}
else if (river.Tiles.Count >= MinRiverLength)
{
//Validation passed - Add river to list
Rivers.Add(river);
tile.Rivers.Add(river);
rivercount--;
}
}
attempts++;
}
}
public void SetRiverPath(River river)
{
if (!Collidable)
{
return;
}
if (!Rivers.Contains(river))
{
Rivers.Add(river);
}
}
public int GetRiverNeighborCount(River river)
{
int count = 0;
if (Left != null && Left.Rivers.Count > 0 && Left.Rivers.Contains(river))
{
count++;
}
if (Right != null && Right.Rivers.Count > 0 && Right.Rivers.Contains(river))
{
count++;
}
if (Top != null && Top.Rivers.Count > 0 && Top.Rivers.Contains(river))
{
count++;
}
if (Bottom != null && Bottom.Rivers.Count > 0 && Bottom.Rivers.Contains(river))
{
count++;
}
return(count);
}
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 FindPathToWater(Tile tile, Direction direction, ref River river)
{
if (tile.Rivers.Contains(river))
{
return;
}
// check if there is already a river on this tile
if (tile.Rivers.Count > 0)
{
river.Intersections++;
}
river.AddTile(tile);
// get neighbors
Tile left = GetLeft(tile);
Tile right = GetRight(tile);
Tile top = GetTop(tile);
Tile bottom = GetBottom(tile);
float leftValue = int.MaxValue;
float rightValue = int.MaxValue;
float topValue = int.MaxValue;
float bottomValue = int.MaxValue;
// query height values of neighbors
if (left != null && left.GetRiverNeighborCount(river) < 2 && !river.Tiles.Contains(left))
{
leftValue = left.HeightValue;
}
if (right != null && right.GetRiverNeighborCount(river) < 2 && !river.Tiles.Contains(right))
{
rightValue = right.HeightValue;
}
if (top != null && top.GetRiverNeighborCount(river) < 2 && !river.Tiles.Contains(top))
{
topValue = top.HeightValue;
}
if (bottom != null && bottom.GetRiverNeighborCount(river) < 2 && !river.Tiles.Contains(bottom))
{
bottomValue = bottom.HeightValue;
}
// if neighbor is existing river that is not this one, flow into it
if (bottom != null && bottom.Rivers.Count == 0 && !bottom.Collidable)
{
bottomValue = 0;
}
if (top != null && top.Rivers.Count == 0 && !top.Collidable)
{
topValue = 0;
}
if (left != null && left.Rivers.Count == 0 && !left.Collidable)
{
leftValue = 0;
}
if (right != null && right.Rivers.Count == 0 && !right.Collidable)
{
rightValue = 0;
}
// override flow direction if a tile is significantly lower
if (direction == Direction.Left)
{
if (Math.Abs(rightValue - leftValue) < 0.1f)
{
rightValue = int.MaxValue;
}
}
if (direction == Direction.Right)
{
if (Math.Abs(rightValue - leftValue) < 0.1f)
{
leftValue = int.MaxValue;
}
}
if (direction == Direction.Top)
{
if (Math.Abs(topValue - bottomValue) < 0.1f)
{
bottomValue = int.MaxValue;
}
}
if (direction == Direction.Bottom)
{
if (Math.Abs(topValue - bottomValue) < 0.1f)
{
topValue = int.MaxValue;
}
}
// find mininum
float min = Math.Min(Math.Min(Math.Min(leftValue, rightValue), topValue), bottomValue);
// if no minimum found - exit
if (min == int.MaxValue)
{
return;
}
//Move to next neighbor
if (min == leftValue)
{
if (left != null && left.Collidable)
{
if (river.CurrentDirection != Direction.Left)
{
river.TurnCount++;
river.CurrentDirection = Direction.Left;
}
FindPathToWater(left, direction, ref river);
}
}
else if (min == rightValue)
{
if (right != null && right.Collidable)
{
if (river.CurrentDirection != Direction.Right)
{
river.TurnCount++;
river.CurrentDirection = Direction.Right;
}
FindPathToWater(right, direction, ref river);
}
}
else if (min == bottomValue)
{
if (bottom != null && bottom.Collidable)
{
if (river.CurrentDirection != Direction.Bottom)
{
river.TurnCount++;
river.CurrentDirection = Direction.Bottom;
}
FindPathToWater(bottom, direction, ref river);
}
}
else if (min == topValue)
{
if (top != null && top.Collidable)
{
if (river.CurrentDirection != Direction.Top)
{
river.TurnCount++;
river.CurrentDirection = Direction.Top;
}
FindPathToWater(top, direction, ref river);
}
}
}
// Dig river
private void DigRiver(River river)
{
int counter = 0;
// How wide are we digging this river?
int size = Random.Next(1, 5);
river.Length = river.Tiles.Count;
// randomize size change
int two = river.Length / 2;
int three = two / 2;
int four = three / 2;
int five = four / 2;
int twomin = two / 3;
int threemin = three / 3;
int fourmin = four / 3;
int fivemin = five / 3;
// randomize lenght of each size
int count1 = Random.Next(fivemin, five);
if (size < 4)
{
count1 = 0;
}
int count2 = count1 + Random.Next(fourmin, four);
if (size < 3)
{
count2 = 0;
count1 = 0;
}
int count3 = count2 + Random.Next(threemin, three);
if (size < 2)
{
count3 = 0;
count2 = 0;
count1 = 0;
}
int count4 = count3 + Random.Next(twomin, two);
// Make sure we are not digging past the river path
if (count4 > river.Length)
{
int extra = count4 - river.Length;
while (extra > 0)
{
if (count1 > 0)
{
count1--; count2--; count3--; count4--; extra--;
}
else if (count2 > 0)
{
count2--; count3--; count4--; extra--;
}
else if (count3 > 0)
{
count3--; count4--; extra--;
}
else if (count4 > 0)
{
count4--; extra--;
}
}
}
// Dig it out
for (int i = river.Tiles.Count - 1; i >= 0; i--)
{
Tile t = river.Tiles[i];
if (counter < count1)
{
t.DigRiver(river, 4);
}
else if (counter < count2)
{
t.DigRiver(river, 3);
}
else if (counter < count3)
{
t.DigRiver(river, 2);
}
else if (counter < count4)
{
t.DigRiver(river, 1);
}
else
{
t.DigRiver(river, 0);
}
counter++;
}
}
// Dig river based on a parent river vein
private void DigRiver(River river, River parent)
{
int intersectionID = 0;
int intersectionSize = 0;
// determine point of intersection
for (int i = 0; i < river.Tiles.Count; i++)
{
Tile t1 = river.Tiles[i];
for (int j = 0; j < parent.Tiles.Count; j++)
{
Tile t2 = parent.Tiles[j];
if (t1 == t2)
{
intersectionID = i;
intersectionSize = t2.RiverSize;
}
}
}
int counter = 0;
int intersectionCount = river.Tiles.Count - intersectionID;
int size = Random.Next(intersectionSize, 5);
river.Length = river.Tiles.Count;
// randomize size change
int two = river.Length / 2;
int three = two / 2;
int four = three / 2;
int five = four / 2;
int twomin = two / 3;
int threemin = three / 3;
int fourmin = four / 3;
int fivemin = five / 3;
// randomize length of each size
int count1 = Random.Next(fivemin, five);
if (size < 4)
{
count1 = 0;
}
int count2 = count1 + Random.Next(fourmin, four);
if (size < 3)
{
count2 = 0;
count1 = 0;
}
int count3 = count2 + Random.Next(threemin, three);
if (size < 2)
{
count3 = 0;
count2 = 0;
count1 = 0;
}
int count4 = count3 + Random.Next(twomin, two);
// Make sure we are not digging past the river path
if (count4 > river.Length)
{
int extra = count4 - river.Length;
while (extra > 0)
{
if (count1 > 0)
{
count1--; count2--; count3--; count4--; extra--;
}
else if (count2 > 0)
{
count2--; count3--; count4--; extra--;
}
else if (count3 > 0)
{
count3--; count4--; extra--;
}
else if (count4 > 0)
{
count4--; extra--;
}
}
}
// adjust size of river at intersection point
if (intersectionSize == 1)
{
count4 = intersectionCount;
count1 = 0;
count2 = 0;
count3 = 0;
}
else if (intersectionSize == 2)
{
count3 = intersectionCount;
count1 = 0;
count2 = 0;
}
else if (intersectionSize == 3)
{
count2 = intersectionCount;
count1 = 0;
}
else if (intersectionSize == 4)
{
count1 = intersectionCount;
}
else
{
count1 = 0;
count2 = 0;
count3 = 0;
count4 = 0;
}
// dig out the river
for (int i = river.Tiles.Count - 1; i >= 0; i--)
{
Tile t = river.Tiles[i];
if (counter < count1)
{
t.DigRiver(river, 4);
}
else if (counter < count2)
{
t.DigRiver(river, 3);
}
else if (counter < count3)
{
t.DigRiver(river, 2);
}
else if (counter < count4)
{
t.DigRiver(river, 1);
}
else
{
t.DigRiver(river, 0);
}
counter++;
}
}
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);
}
}
}
}
}
// This function got messy. Sorry.
public void DigRiver(River river, int size)
{
SetRiverTile(river);
RiverSize = size;
if (size == 1)
{
if (Bottom != null)
{
Bottom.SetRiverTile(river);
if (Bottom.Right != null)
{
Bottom.Right.SetRiverTile(river);
}
}
if (Right != null)
{
Right.SetRiverTile(river);
}
}
if (size == 2)
{
if (Bottom != null)
{
Bottom.SetRiverTile(river);
if (Bottom.Right != null)
{
Bottom.Right.SetRiverTile(river);
}
}
if (Right != null)
{
Right.SetRiverTile(river);
}
if (Top != null)
{
Top.SetRiverTile(river);
if (Top.Left != null)
{
Top.Left.SetRiverTile(river);
}
if (Top.Right != null)
{
Top.Right.SetRiverTile(river);
}
}
if (Left != null)
{
Left.SetRiverTile(river);
if (Left.Bottom != null)
{
Left.Bottom.SetRiverTile(river);
}
}
}
if (size == 3)
{
if (Bottom != null)
{
Bottom.SetRiverTile(river);
if (Bottom.Right != null)
{
Bottom.Right.SetRiverTile(river);
}
if (Bottom.Bottom != null)
{
Bottom.Bottom.SetRiverTile(river);
if (Bottom.Bottom.Right != null)
{
Bottom.Bottom.Right.SetRiverTile(river);
}
}
}
if (Right != null)
{
Right.SetRiverTile(river);
if (Right.Right != null)
{
Right.Right.SetRiverTile(river);
if (Right.Right.Bottom != null)
{
Right.Right.Bottom.SetRiverTile(river);
}
}
}
if (Top != null)
{
Top.SetRiverTile(river);
if (Top.Left != null)
{
Top.Left.SetRiverTile(river);
}
if (Top.Right != null)
{
Top.Right.SetRiverTile(river);
}
}
if (Left != null)
{
Left.SetRiverTile(river);
if (Left.Bottom != null)
{
Left.Bottom.SetRiverTile(river);
}
}
}
if (size == 4)
{
if (Bottom != null)
{
Bottom.SetRiverTile(river);
if (Bottom.Right != null)
{
Bottom.Right.SetRiverTile(river);
}
if (Bottom.Bottom != null)
{
Bottom.Bottom.SetRiverTile(river);
if (Bottom.Bottom.Right != null)
{
Bottom.Bottom.Right.SetRiverTile(river);
}
}
}
if (Right != null)
{
Right.SetRiverTile(river);
if (Right.Right != null)
{
Right.Right.SetRiverTile(river);
if (Right.Right.Bottom != null)
{
Right.Right.Bottom.SetRiverTile(river);
}
}
}
if (Top != null)
{
Top.SetRiverTile(river);
if (Top.Right != null)
{
Top.Right.SetRiverTile(river);
if (Top.Right.Right != null)
{
Top.Right.Right.SetRiverTile(river);
}
}
if (Top.Top != null)
{
Top.Top.SetRiverTile(river);
if (Top.Top.Right != null)
{
Top.Top.Right.SetRiverTile(river);
}
}
}
if (Left != null)
{
Left.SetRiverTile(river);
if (Left.Bottom != null)
{
Left.Bottom.SetRiverTile(river);
if (Left.Bottom.Bottom != null)
{
Left.Bottom.Bottom.SetRiverTile(river);
}
}
if (Left.Left != null)
{
Left.Left.SetRiverTile(river);
if (Left.Left.Bottom != null)
{
Left.Left.Bottom.SetRiverTile(river);
}
if (Left.Left.Top != null)
{
Left.Left.Top.SetRiverTile(river);
}
}
if (Left.Top != null)
{
Left.Top.SetRiverTile(river);
if (Left.Top.Top != null)
{
Left.Top.Top.SetRiverTile(river);
}
}
}
}
}