/// <summary>
/// Generate an initial population of individuals
/// </summary>
/// <param name="individuals">An empty list to populate with the individuals</param>
public void Populate(ArrayList individuals)
{
while (individuals.Count < populationSize)
{
RoadNetwork network = new RoadNetwork(map);
int startIndex = network.AddVertexUnique(map.Start);
int endIndex = network.AddVertexUnique(map.End);
Vertex start = network.GetVertex(startIndex);
Vertex end = network.GetVertex(endIndex);
int nPaths = random.Next(10);
for (int i = 0; i < nPaths; i++)
{
int midpointIndex = network.AddVertexUnique(random.Next(map.Width), random.Next(map.Height));
Vertex midpoint = network.GetVertex(midpointIndex);
StepMutator.StepPath(network, start, midpoint);
StepMutator.StepPath(network, midpoint, end);
}
int nCross = random.Next(10);
for (int i = 0; i < nCross; i++)
{
Vertex startPoint = network.GetVertex(random.Next(network.VertexCount));
Vertex endPoint = network.GetVertex(random.Next(network.VertexCount));
StepMutator.StepPath(network, startPoint, endPoint);
}
network.SetEnd(endIndex);
individuals.Add(network);
}
}
/// <summary>
/// Perform mutations on the network
/// </summary>
/// <param name="ent">Network to mutate</param>
public RoadNetwork Mutate(RoadNetwork ent)
{
RoadNetwork ret = new RoadNetwork(ent.Map);
ent.Start.Copy = ret.AddVertex(ent.Start.Coordinates);
// Copy over verticies
for (int ii = 1; ii < ent.VertexCount - 1; ii++)
{
Vertex v = ent.GetVertex(ii);
v.Copy = null;
// Only move the vertex if a random number succeeds
if (random.NextDouble() < chance_delete_vertex)
continue;
else if (random.NextDouble() < chance_move_vertex)
v.Copy = MoveVertex(ret, v);
else
v.Copy = ret.AddVertex(v.Coordinates);
}
// Create some new verticies
int num_new_verts = ent.EdgeCount;
if (num_new_verts < min_vertex_base) num_new_verts = min_vertex_base;
num_new_verts = (int)(num_new_verts * max_new_verticies * random.NextDouble());
for( int ii = 0; ii < num_new_verts; ii ++ )
{
AddVertex(ret);
}
ent.End.Copy = ret.AddVertex(ent.End.Coordinates);
// Copy over edges
for (int ii = 0; ii < ent.EdgeCount; ii++)
{
Edge e = ent.GetEdge(ii);
if (random.NextDouble() < chance_delete_edge)
continue;
else if (e.Start.Copy == null || e.End.Copy == null)
continue;
else
ret.AddEdge(e.Start.Copy, e.End.Copy);
}
// Create some new edges
int num_new_edges = ent.EdgeCount;
if(num_new_edges < min_edge_base) num_new_edges = min_edge_base;
num_new_edges = (int)(num_new_edges * max_new_edges * random.NextDouble());
for( int ii = 0; ii < num_new_edges; ii ++ )
{
AddEdge(ret);
}
RepairMesh(ret);
return ret;
}
/// <summary>
/// Generate an initial population of individuals
/// </summary>
/// <param name="individuals">An empty list to populate with the individuals</param>
public void Populate(ArrayList individuals)
{
RoadNetwork original = new RoadNetwork(map);
int startIndex = original.AddVertexUnique(map.Start);
int endIndex = original.AddVertexUnique(map.End);
Vertex start = original.GetVertex(startIndex);
Vertex end = original.GetVertex(endIndex);
StepMutator.StepPath(original, start, end);
original.SetEnd(endIndex);
individuals.Add(original);
while (individuals.Count < populationSize)
{
individuals.Add(StepMutator.Mutate((RoadNetwork)individuals[random.Next(individuals.Count)]));
}
}
/// <summary>
/// Make a path between two vertices in a RoadNetwork out of a number of edges connecting adjacent points.
/// </summary>
/// <param name="network">The RoadNetwork to make the path in</param>
/// <param name="start">The start Vertex of the path</param>
/// <param name="end">The end Vertex of the path</param>
public static void StepPath(RoadNetwork network, Vertex start, Vertex end)
{
int dX = end.Coordinates.X - start.Coordinates.X;
int dY = end.Coordinates.Y - start.Coordinates.Y;
int xStep = 1;
if (dX < 0)
{
dX = -dX;
xStep = -1;
}
int yStep = 1;
if (dY < 0)
{
dY = -dY;
yStep = -1;
}
int x = start.Coordinates.X;
int y = start.Coordinates.Y;
Vertex startVertex = start;
while (dX > 1 || dY > 1)
{
if (dX > dY)
{
x += xStep;
dX--;
}
else if (dY > dX)
{
y += yStep;
dY--;
}
else
{
x += xStep;
dX--;
y += yStep;
dY--;
}
int index = network.AddVertexUnique(x, y);
Vertex endVertex = network.GetVertex(index);
network.AddEdge(startVertex, endVertex);
startVertex = endVertex;
}
network.AddEdge(startVertex, end);
}
/// <summary>
/// Randomly alter a RoadNetwork to Produce a slightly different RoadNetwork
/// </summary>
/// <param name="source">The RoadNetwork to mutate</param>
/// <returns>The mutated RoadNetwork</returns>
public static RoadNetwork Mutate(RoadNetwork source)
{
Map map = source.Map;
int mapWidth = map.Width;
int mapHeight = map.Height;
int maxXChange = 1 + mapWidth / 10;
int maxYChange = 1 + mapHeight / 10;
source.ClearCopies();
source.SetVisited(false);
source.SetBroken(true);
RoadNetwork destination = new RoadNetwork(map);
int endVertexIndex = -1;
LinkedList<Vertex> vertexStack = new LinkedList<Vertex>();
source.Start.Visited = true;
vertexStack.AddFirst(source.Start);
while (vertexStack.Count > 0)
{
Vertex vertex = vertexStack.First();
vertexStack.RemoveFirst();
List<Vertex> nextVertices = new List<Vertex>();
for (int i = 0; i < vertex.EdgeCount; i++)
{
Edge edge = vertex.GetEdge(i);
Vertex nextVertex = edge.End;
if (!nextVertex.Visited)
{
edge.Broken = false;
nextVertex.Visited = true;
nextVertices.Add(nextVertex);
}
}
//If this vertex is a leaf of the tree and not the end vertex it has a 25% chance of
//begin removed.
if (nextVertices.Count > 0 || vertex == source.End || random.Next(4) > 0)
{
Coordinates coordinates = vertex.Coordinates;
if (vertex != source.Start && vertex != source.End && random.Next(4) == 0)
{
coordinates = RandomAdjacentPoint(vertex.Coordinates);
}
int index = destination.AddVertexUnique(vertex.Coordinates);
vertex.Copy = destination.GetVertex(index);
if (vertex == source.End)
{
endVertexIndex = index;
}
}
//Shuffle Vertices
for (int n = nextVertices.Count - 1; n > 0; n--)
{
int m = random.Next(n + 1);
Vertex temp = nextVertices[m];
nextVertices[m] = nextVertices[n];
nextVertices[n] = temp;
}
//Push vertices onto stack in shiffled order.
foreach (Vertex nextVertex in nextVertices)
{
vertexStack.AddFirst(nextVertex);
}
}
for (int i = 0; i < source.EdgeCount; i++)
{
Edge edge = source.GetEdge(i);
if ((!edge.Broken || random.Next(4) > 0) && edge.Start.Copy != null && edge.End.Copy != null)
{
StepPath(destination, edge.Start.Copy, edge.End.Copy);
}
}
int newVertices = random.Next(20);
for (int i = 0; i < newVertices; i++)
{
Vertex startVertex = destination.GetVertex(random.Next(destination.VertexCount));
int index = destination.AddVertexUnique(RandomAdjacentPoint(startVertex.Coordinates));
Vertex endVertex = destination.GetVertex(index);
destination.AddEdge(startVertex, endVertex);
}
if (endVertexIndex == -1)
{
throw new Exception("End vertex not found.");
}
else
{
destination.SetEnd(endVertexIndex);
}
return destination;
}
static void Save()
{
Random random = new Random();
Map map = Map.FromFile("map.xml");
IOutputter outputter = new RoadNetworkXmlOutputter("c:\\cits3200test\\roadnetworks.xml");
outputter.OpenOutput();
for (int g = 0; g < 10; g++)
{
AATreeGeneration generation = new AATreeGeneration();
for (int i = 0; i < 20; i++)
{
RoadNetwork network = new RoadNetwork(map);
for (int v = 0; v < 100; v++)
{
network.AddVertex(random.Next(100), random.Next(100));
}
for (int e = 0; e < 1000; e++)
{
network.AddEdge(network.GetVertex(random.Next(100)), network.GetVertex(random.Next(100)));
}
generation.Insert(network, (uint)i);
}
outputter.OutputGeneration(generation, g);
}
outputter.CloseOutput();
}
static RoadNetwork RandomNetwork(Map map)
{
Random random = new Random();
RoadNetwork network = new RoadNetwork(map);
network.AddVertex(map.Start);
network.AddVertex(map.End);
Vertex start = network.Start;
Vertex end = network.End;
for (int i = 0; i < 2; i++)
{
Vertex startPoint = start;
for (int j = 0; j < 10; j++)
{
Vertex endPoint = network.AddVertex(random.Next(map.Width), random.Next(map.Height));
network.AddEdge(startPoint, endPoint);
startPoint = endPoint;
}
network.AddEdge(startPoint, end);
}
for (int k = 0; k < 80; k++)
{
Vertex startPoint = network.GetVertex(random.Next(network.VertexCount));
Vertex endPoint = network.AddVertex(random.Next(map.Width), random.Next(map.Height));
network.AddEdge(startPoint, endPoint);
}
for (int l = 0; l < 20; l++)
{
Vertex startPoint = network.GetVertex(random.Next(network.VertexCount));
Vertex endPoint = network.GetVertex(random.Next(network.VertexCount));
network.AddEdge(startPoint, endPoint);
}
network.SetEnd(1);
return network;
}
private void RepairMesh(RoadNetwork network)
{
network.SetVisited(false);
int num_unknown = network.VertexCount;
LinkedList<Vertex> to_check = new LinkedList<Vertex>();
to_check.AddLast( network.Start );
while( num_unknown > 0 )
{
Vertex v = null;
// While there's still unchecked nodes in this group
while(to_check.Count > 0)
{
v = to_check.First.Value;
to_check.RemoveFirst();
v.Visited = true;
num_unknown --;
for( int i = 0; i < v.EdgeCount; i ++ )
{
Vertex next = v.GetEdge(i).End;
if (next.Visited) continue;
to_check.AddLast(next);
}
}
// If there are still unreached verticies, pick the first and connect
if( num_unknown > 0 )
{
Vertex end = null;
// Find the first non-visited vertex
for (int i = 0; i < network.VertexCount; i++)
{
if (!network.GetVertex(i).Visited)
{
end = network.GetVertex(i);
break;
}
}
// Make an edge from this vertex to the last checked
network.AddEdge(v, end);
to_check.AddLast(end);
}
}
}
private void AddVertex(RoadNetwork network)
{
Vertex prev = null;
Vertex next = null;
int x = (int)( random.NextDouble() * network.Map.Width );
int y = (int)( random.NextDouble() * network.Map.Height );
if (network.VertexCount >= 2)
{
// Create new links
int prev_idx = (int)(random.NextDouble() * (network.VertexCount));
int next_idx = (int)(random.NextDouble() * (network.VertexCount - 1));
prev = network.GetVertex(prev_idx);
// Get the next vertex, and make sure it's not the previous
if (next_idx == prev_idx)
next_idx = (next_idx + 1) % network.VertexCount;
next = network.GetVertex(next_idx);
}
Vertex v = network.AddVertex(new Coordinates(x, y));
if(network.VertexCount >= 2)
{
// Create two edges for it
network.AddEdge(prev, v);
network.AddEdge(v, next);
}
}
/// <summary>
/// Add a random edge to the network
/// </summary>
/// <param name="network"></param>
/// <returns>
/// False if the edge was not created (due to a collision), true if it was
/// </returns>
private bool AddEdge(RoadNetwork network)
{
// Get two verticies (-1 creates a smaller pool)
int start_idx = (int)(random.NextDouble() * network.VertexCount);
int end_idx = (int)(random.NextDouble() * (network.VertexCount - 1));
// Handle collision
if(end_idx >= start_idx) end_idx ++;
Vertex start = network.GetVertex(start_idx);
Vertex end = network.GetVertex(end_idx);
// Make sure this isn't making a duplicate (or reverse duplicate)
for( int i = 0; i < network.EdgeCount; i ++ )
{
Edge edge = network.GetEdge(i);
if( edge.Start == start && edge.End == end )
return false;
if( edge.End == start && edge.Start == end )
return false;
}
network.AddEdge(start, end);
return true;
}
/// <summary>
/// Randomly alter a RoadNetwork to Produce a slightly different RoadNetwork
/// </summary>
/// <param name="source">The RoadNetwork to mutate</param>
/// <returns>The mutated RoadNetwork</returns>
public static RoadNetwork Mutate(RoadNetwork source)
{
Map map = source.Map;
int mapWidth = map.Width;
int mapHeight = map.Height;
int maxXChange = 1 + mapWidth / 10;
int maxYChange = 1 + mapHeight / 10;
source.ClearCopies();
source.SetVisited(false);
source.SetBroken(true);
RoadNetwork destination = new RoadNetwork(map);
int endVertexIndex = -1;
LinkedList<Vertex> vertexStack = new LinkedList<Vertex>();
source.Start.Visited = true;
vertexStack.AddFirst(source.Start);
while (vertexStack.Count > 0)
{
Vertex vertex = vertexStack.First();
vertexStack.RemoveFirst();
List<Vertex> nextVertices = new List<Vertex>();
for (int i = 0; i < vertex.EdgeCount; i++)
{
Edge edge = vertex.GetEdge(i);
Vertex nextVertex = edge.End;
if (!nextVertex.Visited)
{
edge.Broken = false;
nextVertex.Visited = true;
nextVertices.Add(nextVertex);
}
}
//If this vertex is a leaf of the tree and not the end vertex it has a 25% chance of
//begin removed.
if (nextVertices.Count > 0 || vertex == source.End || random.Next(4) > 0)
{
if (vertex == source.End)
{
endVertexIndex = destination.VertexCount;
}
if (vertex == source.Start || vertex == source.End || random.Next(10) > 0)
{
destination.CopyVertex(vertex);
}
else
{
int x = vertex.Coordinates.X + random.Next(2 * maxXChange+1) - maxXChange;
int y = vertex.Coordinates.Y + random.Next(2 * maxYChange + 1) - maxYChange;
x = Math.Max(0, Math.Min(x, map.Width - 1));
y = Math.Max(0, Math.Min(y, map.Height - 1));
vertex.Copy = destination.AddVertex(x, y);
}
}
//Shuffle Vertices
for (int n = nextVertices.Count - 1; n > 0; n--)
{
int m = random.Next(n + 1);
Vertex temp = nextVertices[m];
nextVertices[m] = nextVertices[n];
nextVertices[n] = temp;
}
//Push vertices onto stack in shiffled order.
foreach (Vertex nextVertex in nextVertices)
{
vertexStack.AddFirst(nextVertex);
}
}
for (int i = 0; i < source.EdgeCount; i++)
{
Edge edge = source.GetEdge(i);
if ((!edge.Broken || random.Next(4) > 0) && edge.Start.Copy != null && edge.End.Copy != null)
{
destination.CopyEdge(edge);
}
}
int verticesToAdd = random.Next(10);
for (int i = 0; i < verticesToAdd; i++)
{
Vertex startVertex = destination.GetVertex(random.Next(destination.VertexCount));
Vertex endVertex = destination.AddVertex(random.Next(mapWidth), random.Next(mapHeight));
destination.AddEdge(startVertex, endVertex);
}
int edgesToAdd = random.Next(destination.VertexCount/2);
for (int i = 0; i < edgesToAdd; i++)
{
Vertex startVertex = destination.GetVertex(random.Next(destination.VertexCount));
Vertex endVertex = destination.GetVertex(random.Next(destination.VertexCount));
if (startVertex != endVertex)
{
destination.AddEdge(startVertex, endVertex);
}
}
if (endVertexIndex == -1)
{
throw new Exception("End vertex not found.");
}
else
{
destination.SetEnd(endVertexIndex);
}
return destination;
}