static void AddPointToStartFrom(double startDirectionChangeChance)
{
maxLength--;
if (maxLength <= 0)
{
return;
}
var chosenDirection = currentDirection;
List <Direct.Direction> directionPossibilities = null;
if (MathHelper.RandomChance(chanceToVaryFromDirection))
{
directionPossibilities = Direct.FullNeighborsOfWithout(currentDirection);
chosenDirection = ListHelper.RandomElementInList(directionPossibilities);
}
last = PointHelper.PointInDirection(last, chosenDirection);
foreach (var p in PointHelper.PointsInDistanceAround(last, 4))
{
Map.AddWaterAt(p);
}
if (MathHelper.RandomChance(startDirectionChangeChance))
{
directionPossibilities = Direct.FullNeighborsOfWithout(currentDirection);
currentDirection = ListHelper.RandomElementInList(directionPossibilities);
startDirectionChangeChance = changeDirectionModifier * -1 * 15;
}
startDirectionChangeChance += changeDirectionModifier;
AddPointToStartFrom(startDirectionChangeChance);
}
public static void MakeRiver(Point start)
{
//decide one main start direction (startDir)
//each point in start trail gets to add one point to the start trail in either startDir or either of startDir's neighbors
//each point also has a slowly increasing chance to modify startDir to one of startDir's neighbors
currentDirection = Direct.RandomFullDirection();
last = start;
AddPointToStartFrom(0);
}
public static Point PointInDirection(Point point, Direct.Direction direction) => PointInDirectionBy(point, direction, 1);
public static Point PointInDirectionBy(Point point, Direct.Direction direction, int moveBy) => PointOffsetBy(point, PointExbandedBy(Direct.DirectionPointMap[direction], moveBy));
static void MoveAntInDirection(AntMemory ant, Direct.Direction direction)
{
Map.AddGroundAt(ant.Location);
ant.Location = PointHelper.PointInDirection(ant.Location, direction);
Map.AddAntAt(ant.Location);
}
