public static Path<Node> FindPath(
Node start,
Node destination,
Func<Node, Node, double> distance,
Func<Node, double> estimate)
{
var closed = new HashSet<Vector2>();
var queue = new PriorityQueue<double, Path<Node>>();
queue.Enqueue(0, new Path<Node>(start));
while (!queue.IsEmpty)
{
var path = queue.Dequeue();
if (closed.Contains(path.LastStep.Point))
{
continue;
}
if (path.LastStep.Point.Equals(destination.Point))
return path;
closed.Add(path.LastStep.Point);
foreach (Node n in path.LastStep.Neightbours)
{
double d = distance(path.LastStep, n);
var newPath = path.AddStep(n, d);
queue.Enqueue(newPath.TotalCost + estimate(n), newPath);
}
}
return null;
}
public static List<Vector2> PathFind(Vector2 start, Vector2 end)
{
var result = new List<Vector2>();
try
{
var innerPolygonList = new List<Geometry.Polygon>();
var outerPolygonList = new List<Geometry.Polygon>();
foreach (var skillshot in Program.DetectedSkillshots)
{
if (skillshot.Evade())
{
innerPolygonList.Add(skillshot.PathFindingInnerPolygon);
outerPolygonList.Add(skillshot.PathFindingPolygon);
}
}
var innerPolygons = Geometry.ClipPolygons(innerPolygonList).ToPolygons();
var outerPolygons = Geometry.ClipPolygons(outerPolygonList).ToPolygons();
if (outerPolygons.Aggregate(false, (current, poly) => current || !poly.IsOutside(end)))
{
end = Evader.GetClosestOutsidePoint(end, outerPolygons);
}
if (outerPolygons.Aggregate(false, (current, poly) => current || !poly.IsOutside(start)))
{
start = Evader.GetClosestOutsidePoint(start, outerPolygons);
}
if (Utils.CanReach(start, end, innerPolygons, true))
{
return new List<Vector2> { start, end };
}
outerPolygons.Add(new Geometry.Polygon { Points = new List<Vector2> { start, end } });
var nodes = new List<Node>();
foreach (var pol in outerPolygons)
{
for (int i = 0; i < pol.Points.Count; i++)
{
if (pol.Points.Count == 2 || !Utils.IsVertexConcave(pol.Points, i))
{
var node = nodes.FirstOrDefault(node1 => node1.Point == pol.Points[i]);
if (node == null)
{
node = new Node(pol.Points[i]);
}
nodes.Add(node);
foreach (var polygon in outerPolygons)
{
foreach (var point in polygon.Points)
{
if (Utils.CanReach(pol.Points[i], point, innerPolygons, true))
{
var nodeToAdd = nodes.FirstOrDefault(node1 => node1.Point == point);
if (nodeToAdd == null)
{
nodeToAdd = new Node(point);
}
nodes.Add(nodeToAdd);
node.Neightbours.Add(nodeToAdd);
}
}
}
}
}
}
var startNode = nodes.FirstOrDefault(n => n.Point == start);
var endNode = nodes.FirstOrDefault(n => n.Point == end);
if (endNode == null)
{
return result;
}
Func<Node, Node, double> distance = (node1, node2) => node1.Point.LSDistance(node2.Point);
Func<Node, double> estimate = t => t.Point.LSDistance(endNode.Point);
var foundPath = FindPath(startNode, endNode, distance, estimate);
if (foundPath == null)
{
return result;
}
result.AddRange(foundPath.Select(node => node.Point));
result.Reverse();
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
return result;
}