/// <summary>
/// Checks if the given position is a choke point by looking in 8 directions.
/// </summary>
/// <param name="pos"> The position to check. </param>
/// <param name="width"> The width of a choke point. </param>
/// <returns> True if the position is a choke point; false otherwise. </returns>
private bool IsPositionChokePoint(Position pos, int width)
{
// The directions represented as a position, along with how far there is to the nearest cliff.
var directions = new List <Tuple <Position, int> >
{
new Tuple <Position, int>(new Position(-1, 0), -1), // West
new Tuple <Position, int>(new Position(1, 0), -1), // East
new Tuple <Position, int>(new Position(0, -1), -1), // South
new Tuple <Position, int>(new Position(0, 1), -1), // North
new Tuple <Position, int>(new Position(1, -1), -1), // South-east
new Tuple <Position, int>(new Position(-1, 1), -1), // North-west
new Tuple <Position, int>(new Position(-1, -1), -1), // South-west
new Tuple <Position, int>(new Position(1, 1), -1) // North-east
};
// The opposite directions.
var directionCombinations = new Dictionary <int, int>
{
{ 0, 1 }, // West + East
{ 2, 3 }, // South + north
{ 4, 5 }, // South-east + north-west
{ 6, 7 } // South-west + north-east
};
// Find the nearest cliff in each of the 8 directions.
for (var i = 0; i < width + 1; i++)
{
foreach (var dc in directionCombinations)
{
var dir1 = directions[dc.Key].Item1;
var dir2 = directions[dc.Value].Item1;
var newPos1 = new Position(pos.Item1 + (dir1.Item1 * i), pos.Item2 + (dir1.Item2 * i));
var newPos2 = new Position(pos.Item1 + (dir2.Item1 * i), pos.Item2 + (dir2.Item2 * i));
if (MapHelper.WithinMapBounds(newPos1, this.map.XSize, this.map.YSize))
{
if (directions[dc.Key].Item2 < 0 &&
this.map.HeightLevels[newPos1.Item1, newPos1.Item2] == Enums.HeightLevel.Cliff)
{
directions[dc.Key] = new Tuple <Position, int>(dir1, i);
}
}
if (MapHelper.WithinMapBounds(newPos2, this.map.XSize, this.map.YSize))
{
if (directions[dc.Value].Item2 < 0 &&
this.map.HeightLevels[newPos2.Item1, newPos2.Item2] == Enums.HeightLevel.Cliff)
{
directions[dc.Value] = new Tuple <Position, int>(dir2, i);
}
}
}
}
// The directions to check the ranges between to get a rather clear view
var finalCombinations = new List <Position>
{
new Position(0, 1),
new Position(0, 4),
new Position(0, 7),
new Position(1, 6),
new Position(1, 5),
new Position(2, 3),
new Position(2, 5),
new Position(2, 7),
new Position(3, 6),
new Position(3, 4)
};
// Check the range to cliffs for every interesting direction combination
foreach (var fc in finalCombinations)
{
var dir1Value = directions[fc.Item1].Item2;
var dir2Value = directions[fc.Item2].Item2;
if (dir1Value < 0)
{
continue;
}
if (dir2Value < 0)
{
continue;
}
// -1 because otherwise we count the start position twice.
if ((dir1Value + dir2Value) - 1 <= width)
{
return(true);
}
}
return(false);
}
/// <summary>
/// Checks if the position is a ramp with a choke point of the given width or not.
/// </summary>
/// <param name="pos"> The position to check for a choke point. </param>
/// <param name="width"> The width a place should have to be considered a choke point. </param>
/// <returns> True if the place is a choke point; false otherwise. </returns>
private bool IsRampChokePoint(Position pos, int width)
{
var originalRampType = this.map.HeightLevels[pos.Item1, pos.Item2];
var horizontalFirstEncounter = this.map.HeightLevels[pos.Item1, pos.Item2];
var verticalFirstEncounter = this.map.HeightLevels[pos.Item1, pos.Item2];
// Figure out what is hit first when going either right or up
for (var i = 0; i < 10; i++)
{
// Check to the right
if (MapHelper.WithinMapBounds(pos.Item1, pos.Item2 + i, this.xSize, this.ySize))
{
var right = this.map.HeightLevels[pos.Item1, pos.Item2 + i];
if (horizontalFirstEncounter == originalRampType &&
right != originalRampType)
{
horizontalFirstEncounter = this.map.HeightLevels[pos.Item1, pos.Item2 + i];
}
}
// Check up
if (MapHelper.WithinMapBounds(pos.Item1 + i, pos.Item2, this.xSize, this.ySize))
{
var up = this.map.HeightLevels[pos.Item1 + i, pos.Item2];
if (verticalFirstEncounter == originalRampType &&
up != originalRampType)
{
verticalFirstEncounter = this.map.HeightLevels[pos.Item1 + i, pos.Item2];
}
}
}
// Decide which way the the edges of the ramp are.
var directionChange = (horizontalFirstEncounter == Enums.HeightLevel.Cliff &&
verticalFirstEncounter != Enums.HeightLevel.Cliff)
? new Position(0, 1)
: new Position(1, 0);
var firstPos = new Position(pos.Item1, pos.Item2);
var secondPos = new Position(pos.Item1, pos.Item2);
// Find the two sides of the ramp.
for (var i = 0; i < 10; i++)
{
// If not within the map, don't bother.
if (!MapHelper.WithinMapBounds(
pos.Item1 + (i * directionChange.Item1),
pos.Item2 + (i * directionChange.Item2),
this.xSize,
this.ySize))
{
continue;
}
if (!MapHelper.WithinMapBounds(
pos.Item1 - (i * directionChange.Item1),
pos.Item2 - (i * directionChange.Item2),
this.xSize,
this.ySize))
{
continue;
}
if (firstPos.Equals(pos) &&
this.map.HeightLevels[pos.Item1 + (i * directionChange.Item1), pos.Item2 + (i * directionChange.Item2)] == Enums.HeightLevel.Cliff)
{
firstPos = new Position(
pos.Item1 + (i * directionChange.Item1),
pos.Item2 + (i * directionChange.Item2));
}
if (secondPos.Equals(pos) &&
this.map.HeightLevels[pos.Item1 - (i * directionChange.Item1), pos.Item2 - (i * directionChange.Item2)] == Enums.HeightLevel.Cliff)
{
secondPos = new Position(
pos.Item1 - (i * directionChange.Item1),
pos.Item2 - (i * directionChange.Item2));
}
}
// Check the actual width.
var actualWidth = Math.Abs(firstPos.Item1 - secondPos.Item1) + Math.Abs(firstPos.Item2 - secondPos.Item2) - 1;
return(actualWidth <= width);
}
/// <summary>
/// Figures out how many steps of the path between the start bases the two Xel'Naga towers cover.
/// If the towers cover more than one base, their worth is halved. If they cover a start base, their worth is cut in four (these two stack).
/// </summary>
/// <returns> A value between 0.0 and 1.0 multiplied by significance based on how many steps that are covered. </returns>
private double XelNagaPlacement()
{
// If no Xel'Naga tower are found, return 0.
if (this.xelNagaPosition2 == null)
{
return(0d);
}
double stepsCovered2 =
this.pathBetweenStartBases.Count(
step => MapHelper.CloseTo(step, this.xelNagaPosition2, this.mfo.DistanceToXelNaga));
double max2 = this.mfo.StepsInXelNagaRangeMax;
double min2 = this.mfo.StepsInXelNagaRangeMin;
var actual2 = (stepsCovered2 > max2)
? max2 - (stepsCovered2 - max2)
: stepsCovered2;
if (actual2 < min2)
{
actual2 = min2;
}
var normalized2 = (actual2 - min2) / (max2 - min2);
var basesInVision2 = this.bases.Count(@base => MapHelper.CloseTo(this.xelNagaPosition2, @base));
var startBaseInVision2 = MapHelper.CloseTo(this.xelNagaPosition2, this.startBasePosition1) ||
MapHelper.CloseTo(this.xelNagaPosition2, this.startBasePosition2);
if (basesInVision2 >= 2)
{
normalized2 /= 2;
}
if (startBaseInVision2)
{
normalized2 /= 4;
}
// If only one Xel'Naga tower is found, return the significance for just that one, but halved.
if (this.xelNagaPosition1 == null)
{
return((normalized2 * this.mfo.XelNagaPlacementSignificance) / 2d);
}
double stepsCovered1 =
this.pathBetweenStartBases.Count(
step => MapHelper.CloseTo(step, this.xelNagaPosition1, this.mfo.DistanceToXelNaga));
double max1 = this.mfo.StepsInXelNagaRangeMax;
double min1 = this.mfo.StepsInXelNagaRangeMin;
var actual1 = (stepsCovered1 > max1)
? max1 - (stepsCovered1 - max1)
: stepsCovered1;
if (actual1 < min1)
{
actual1 = min1;
}
var normalized1 = (actual1 - min1) / (max1 - min1);
var basesInVision1 = this.bases.Count(@base => MapHelper.CloseTo(this.xelNagaPosition1, @base));
var startBaseInVision1 = MapHelper.CloseTo(this.xelNagaPosition1, this.startBasePosition1) ||
MapHelper.CloseTo(this.xelNagaPosition1, this.startBasePosition2);
if (basesInVision1 >= 2)
{
normalized1 /= 2;
}
if (startBaseInVision1)
{
normalized1 /= 4;
}
return(((normalized1 + normalized2) / 2d) * this.mfo.XelNagaPlacementSignificance);
}
/// <summary>
/// Calculates the fitness for the map.
/// </summary>
/// <returns> A double representing the fitness of the map. The higher, the better. </returns>
public double CalculateFitness()
{
this.bases = new List <Position>();
// Find a startbase. No need to find all start bases, as the other base should be a complete mirror of this base.
for (var tempY = this.ySize - 1; tempY >= 0; tempY--)
{
for (var tempX = 0; tempX < this.xSize; tempX++)
{
// Find start base 1
if (this.map.MapItems[tempX, tempY] == Enums.Item.StartBase &&
this.startBasePosition2 == null)
{
this.startBasePosition2 = new Tuple <int, int>(tempX + 2, tempY - 2);
}
// Find start base 2
if (this.map.MapItems[tempX, tempY] == Enums.Item.StartBase &&
this.startBasePosition1 == null &&
this.startBasePosition2 != null)
{
if (Math.Abs(tempX - this.startBasePosition2.Item1) > 3 ||
Math.Abs(tempY - this.startBasePosition2.Item2) > 3)
{
this.startBasePosition1 = new Position(tempX + 2, tempY - 2);
}
}
// Check for highest level
if ((this.map.HeightLevels[tempX, tempY] == Enums.HeightLevel.Height1 ||
this.map.HeightLevels[tempX, tempY] == Enums.HeightLevel.Height2) &&
this.map.HeightLevels[tempX, tempY] > this.heighestLevel)
{
this.heighestLevel = this.map.HeightLevels[tempX, tempY];
}
var tempPos = new Position(tempX, tempY);
// Check if the area is a base
if (this.map.MapItems[tempX, tempY] == Enums.Item.Base &&
!MapHelper.CloseToAny(tempPos, this.bases, 5))
{
this.bases.Add(new Position(tempX + 2, tempY - 2));
}
// Save the first XelNaga tower found
if (this.map.MapItems[tempX, tempY] == Enums.Item.XelNagaTower &&
this.xelNagaPosition2 == null)
{
this.xelNagaPosition2 = tempPos;
}
// Save the second XelNaga tower found
if (this.map.MapItems[tempX, tempY] == Enums.Item.XelNagaTower &&
this.xelNagaPosition2 != null &&
this.xelNagaPosition1 == null &&
!MapHelper.CloseTo(tempPos, this.xelNagaPosition2, 4))
{
this.xelNagaPosition1 = tempPos;
}
}
}
// If no start bases are found, the map is not feasible and running fitness calculations is not worth it.
if (this.startBasePosition1 == null || this.startBasePosition2 == null)
{
this.FitnessValues = new MapFitnessValues(
-this.mfo.MaxTotalFitness,
-this.mfo.MaxTotalFitness,
-this.mfo.MaxTotalFitness,
-this.mfo.MaxTotalFitness,
-this.mfo.MaxTotalFitness,
-this.mfo.MaxTotalFitness,
-this.mfo.MaxTotalFitness,
-this.mfo.MaxTotalFitness,
-this.mfo.MaxTotalFitness,
-this.mfo.MaxTotalFitness,
-this.mfo.MaxTotalFitness);
return(this.FitnessValues.TotalFitness);
}
this.pathBetweenStartBases = this.mapPathfinding.FindPathFromTo(
this.startBasePosition1,
this.startBasePosition2,
this.mfo.PathfindingIgnoreDestructibleRocks);
var baseSpace = this.BaseSpace();
var baseHeight = this.BaseHeightLevel();
var pathBetweenStartBasesFitness = this.PathBetweenStartBases();
var newHeightReached = this.NewHeightReached();
var distanceToNaturalExpansion = this.DistanceToNaturalExpansion();
var distanceToNonNaturalExpansions = this.DistanceToNonNaturalExpansions();
var expansionsAvailable = this.ExpansionsAvailable();
var chokePoints = this.ChokePoints();
var xelNagaPlacement = this.XelNagaPlacement();
var startBaseOpeness = this.StartBaseOpeness();
var baseOpeness = this.BaseOpeness();
this.FitnessValues = new MapFitnessValues(
baseSpace,
baseHeight,
pathBetweenStartBasesFitness,
newHeightReached,
distanceToNaturalExpansion,
distanceToNonNaturalExpansions,
expansionsAvailable,
chokePoints,
xelNagaPlacement,
startBaseOpeness,
baseOpeness);
return(this.FitnessValues.TotalFitness);
}
