private RiverPathResults TryFollowSomePath(
List <RiverPath> paths, IEnumerable <IHexCell> oceanCells, HashSet <IHexCell> cellsAdjacentToRiver
)
{
if (paths.Any(path => path.IsAlreadyCompleted()))
{
return(RiverPathResults.Success);
}
while (paths.Count > 0)
{
RiverPath randomPath = paths.First();
var pathResults = randomPath.TryBuildOutPath(cellsAdjacentToRiver, oceanCells);
if (pathResults.Completed)
{
return(pathResults);
}
paths.Remove(randomPath);
}
return(RiverPathResults.Fail);
}
//We need to draw a river from previousCell to nextCell by adding rivers
//to the edges of currentCell. PreviousCell is in directionToNext.Next2(),
//and should have some river pointing at currentCell
private RiverPathResults CreateRiverAlongCell_GentleCWTurn(
IHexCell previousCell, IHexCell currentCell, IHexCell nextCell,
HexDirection directionToPrevious, HexDirection directionToNext,
IEnumerable <IHexCell> oceanCells, HashSet <IHexCell> cellsAdjacentToRiver
)
{
var leftLeftPath = new RiverPath(
currentCell, directionToPrevious.Next(), directionToNext.Previous(),
RiverFlow.Clockwise, RiverCanon, Grid
);
var leftRightPath = new RiverPath(
currentCell, directionToPrevious, directionToNext.Next(),
RiverFlow.Counterclockwise, RiverCanon, Grid
);
var rightRightPath = new RiverPath(
currentCell, directionToNext.Next(),
RiverFlow.Counterclockwise, RiverCanon, Grid
);
var rightleftPath = new RiverPath(
currentCell, directionToPrevious, directionToNext.Previous(),
RiverFlow.Clockwise, RiverCanon, Grid
);
var pathsToTry = new List <RiverPath>();
//If directionToNext.Previous() is considered up,
//this case triggers when previousCell has a river
//along its upper-left edge.
if (RiverCanon.HasRiverAlongEdge(previousCell, directionToPrevious.Next2()))
{
pathsToTry.Add(leftLeftPath);
pathsToTry.Add(leftRightPath);
}
//If directionToNext.Previous() is considered up,
//this case triggers when previousCell has a river
//along its upper-right edge.
if (RiverCanon.HasRiverAlongEdge(previousCell, directionToPrevious.Previous2()))
{
pathsToTry.Add(rightRightPath);
pathsToTry.Add(rightleftPath);
}
return(TryFollowSomePath(pathsToTry, oceanCells, cellsAdjacentToRiver));
}
//We need to draw a river from previousCell to nextCell by adding rivers
//to the edges of currentCell. PreviousCell and nextCell are across from
//each-other. Previous river should have some river pointing at currentCell
private RiverPathResults CreateRiverAlongCell_StraightAcross(
IHexCell previousCell, IHexCell currentCell, IHexCell nextCell,
HexDirection directionToPrevious, HexDirection directionToNext,
IEnumerable <IHexCell> oceanCells, HashSet <IHexCell> cellsAdjacentToRiver
)
{
var leftToLeftPath = new RiverPath(
currentCell, directionToNext.Previous2(), directionToNext.Previous(),
RiverFlow.Clockwise, RiverCanon, Grid
);
var leftToRightPath = new RiverPath(
currentCell, directionToPrevious, directionToNext.Next(),
RiverFlow.Counterclockwise, RiverCanon, Grid
);
var rightToRightPath = new RiverPath(
currentCell, directionToNext.Next2(), directionToNext.Next(),
RiverFlow.Counterclockwise, RiverCanon, Grid
);
var rightToLeftPath = new RiverPath(
currentCell, directionToPrevious, directionToNext.Previous(),
RiverFlow.Clockwise, RiverCanon, Grid
);
var pathsToTry = new List <RiverPath>();
//If nextCell is above us, this case happens when previousCell has a
//river along its left edge
if (RiverCanon.HasRiverAlongEdge(previousCell, directionToNext.Previous()))
{
pathsToTry.Add(leftToLeftPath);
pathsToTry.Add(leftToRightPath);
//If nextCell is above us, this case happens when previousCell has a
//river along its right edge
}
else if (RiverCanon.HasRiverAlongEdge(previousCell, directionToNext.Next()))
{
pathsToTry.Add(rightToRightPath);
pathsToTry.Add(rightToLeftPath);
}
return(TryFollowSomePath(pathsToTry, oceanCells, cellsAdjacentToRiver));
}
//We need to draw a river from previousCell to nextCell by adding rivers
//to the edges of currentCell. PreviousCell is in directionToNext.Next(),
//and should have some river pointing at currentCell
private RiverPathResults CreateRiverAlongCell_SharpCWTurn(
IHexCell previousCell, IHexCell currentCell, IHexCell nextCell,
HexDirection directionToPrevious, HexDirection directionToNext,
IEnumerable <IHexCell> oceanCells, HashSet <IHexCell> cellsAdjacentToRiver
)
{
var leftToLeftPath = new RiverPath(
currentCell, directionToPrevious.Next(), directionToNext.Previous(),
RiverFlow.Clockwise, RiverCanon, Grid
);
var leftToRightPath = new RiverPath(
currentCell, directionToPrevious, RiverFlow.Counterclockwise,
RiverCanon, Grid
);
var pathsToTry = new List <RiverPath>();
//Assuming directionToPrevious.Opposite() is up,
//this case triggers when previousCell has a
//river along its upper left edge
if (RiverCanon.HasRiverAlongEdge(previousCell, directionToPrevious.Next2()))
{
pathsToTry.Add(leftToLeftPath);
pathsToTry.Add(leftToRightPath);
}
//Assuming directionToPrevious.Opposite() is up,
//this case triggers when previousCell has a
//river along its upper right edge
if (RiverCanon.HasRiverAlongEdge(previousCell, directionToPrevious.Previous2()))
{
return(RiverPathResults.Success);
}
return(TryFollowSomePath(pathsToTry, oceanCells, cellsAdjacentToRiver));
}
