public void Run()
{
GenerateStartSegments();
while (queue.Count != 0 && segments.Count < maxSegment)
{
RoadSegment current = queue[0];
queue.RemoveAt(0);
if (!CheckLocalConstraint(current))
{
continue;
}
segments.Add(current);
AddToGraph(current);
GlobalGoals(current);
}
if (segments.Count == maxSegment)
{
Debug.Log("Minor Roads reached maximal amount");
}
DeleteSomeNodes();
DeleteInsideLeaves();
DeleteAloneEdges();
DeleteAloneNodes();
}
private void GlobalGoals(RoadSegment segment)
{
if (segment.EndSegment)
{
return;
}
globalGoalsRoads.Clear();
//Generate in the 3 other possible direction
var dirVector = segment.getDirVector();
var normalVector1 = new Vector2(dirVector.y, -dirVector.x);
var normalVector2 = new Vector2(-dirVector.y, dirVector.x);
RoadSegment branchedSegment1 = CalcNewRoadSegment(segment.NodeTo, dirVector, 0);
RoadSegment branchedSegment2 = CalcNewRoadSegment(segment.NodeTo, normalVector1, 0);
RoadSegment branchedSegment3 = CalcNewRoadSegment(segment.NodeTo, normalVector2, 0);
globalGoalsRoads.Add(branchedSegment1);
globalGoalsRoads.Add(branchedSegment2);
globalGoalsRoads.Add(branchedSegment3);
foreach (RoadSegment newSegment in globalGoalsRoads)
{
queue.Add(newSegment);
}
}
private void GenerateStartSegments()
{
foreach (RoadSegment segment in hwSegments)
{
if (segment.EndSegment)
{
continue;
}
var dirVector = segment.getDirVector();
var normalVector1 = new Vector2(dirVector.y, -dirVector.x);
var normalVector2 = new Vector2(-dirVector.y, dirVector.x);
RoadSegment branchedSegment2 = CalcNewRoadSegment(segment.NodeTo, normalVector1, 0);
RoadSegment branchedSegment3 = CalcNewRoadSegment(segment.NodeTo, normalVector2, 0);
queue.Add(branchedSegment2);
queue.Add(branchedSegment3);
if (hwSegments.IndexOf(segment) == 0) //We also branch out from the very first Node!
{
RoadSegment branchedSegment4 = CalcNewRoadSegment(segment.NodeFrom, normalVector1, 0);
RoadSegment branchedSegment5 = CalcNewRoadSegment(segment.NodeFrom, normalVector2, 0);
queue.Add(branchedSegment4);
queue.Add(branchedSegment5);
}
}
}
private RoadSegment GetContinuingRoadSegment(RoadSegment segment)
{
var dirVector = segment.getDirVector();
if (maxLean < 1)
{
return(CalcNewRoadSegment(segment.NodeTo, dirVector, 0));
}
if (segment.LeanIteration == 3) //Check if we need a new lean. If yes, calculate the next RoadSegment
{
var randomNumber = rand.Next(0, 3);
if (randomNumber == 1)
{
dirVector = RotateVector(dirVector, GetRandomAngle(2, maxLean * 2));
RoadSegment newSegment = CalcNewRoadSegment(segment.NodeTo, dirVector, 0);
newSegment.LeanLeft = true;
return(newSegment);
}
else if (randomNumber == 2)
{
dirVector = RotateVector(dirVector, GetRandomAngle(-2, -maxLean * 2));
RoadSegment newSegment = CalcNewRoadSegment(segment.NodeTo, dirVector, 0);
newSegment.LeanRight = true;
return(newSegment);
}
else
{
return(CalcNewRoadSegment(segment.NodeTo, dirVector, 0));
}
}
else //if not, grow the new segment following the lean
{
if (segment.LeanLeft)
{
dirVector = RotateVector(dirVector, GetRandomAngle(2, maxLean));
RoadSegment segment1 = CalcNewRoadSegment(segment.NodeTo, dirVector, segment.LeanIteration + 1);
segment1.LeanLeft = true;
return(segment1);
}
else if (segment.LeanRight)
{
dirVector = RotateVector(dirVector, GetRandomAngle(-2, -maxLean));
RoadSegment segment1 = CalcNewRoadSegment(segment.NodeTo, dirVector, segment.LeanIteration + 1);
segment1.LeanRight = true;
return(segment1);
}
else
{
return(CalcNewRoadSegment(segment.NodeTo, dirVector, segment.LeanIteration + 1));
}
}
}
private void AddToGraph(RoadSegment road)
{
if (!graph.MajorNodes.Contains(road.NodeFrom) && !graph.MinorNodes.Contains(road.NodeFrom))
{
graph.MinorNodes.Add(road.NodeFrom);
}
if (!graph.MajorNodes.Contains(road.NodeTo) && !graph.MinorNodes.Contains(road.NodeTo))
{
graph.MinorNodes.Add(road.NodeTo);
}
graph.MinorEdges.Add(new Edge(road.NodeFrom, road.NodeTo));
}
private bool CheckLocalConstraint(RoadSegment segment)
{
foreach (RoadSegment road in segments)
{
//If the new segment end is close to another segments Node, Fix it's end to it
if (IsClose(segment.NodeTo, road.NodeTo))
{
segment.NodeTo = road.NodeTo;
segment.EndSegment = true;
}
if (segment.IsCrossing(road))
{
return(false); //Check if segment is crossing an other road
}
}
//Check if segment is out of border
if (segment.NodeFrom.X > border || segment.NodeFrom.X < -border ||
segment.NodeFrom.Y > border || segment.NodeFrom.Y < -border)
{
return(false);
}
//Check if segment would come into itself
if (segment.NodeFrom.X == segment.NodeTo.X && segment.NodeFrom.Y == segment.NodeTo.Y)
{
return(false);
}
//nodeTo or nodeFrom has more than 4 edges
if (segment.NodeTo.Edges.Count >= 4 || segment.NodeFrom.Edges.Count >= 4)
{
return(false);
}
foreach (Edge edge in segment.NodeTo.Edges)
{
//NodeTo already connected to NodeFrom
if (edge.NodeA == segment.NodeFrom || edge.NodeB == segment.NodeFrom)
{
return(false);
}
}
return(true);
}
private void GlobalGoals(RoadSegment segment)
{
if (segment.EndSegment)
{
return;
}
globalGoalsRoads.Clear();
var dirVector = segment.getDirVector();
//BRANCHING
int branchRandom = rand.Next(0, 40); //Branching chance is 3 out of 40
if (branchRandom == 4) //At every 40th points approx. the road branches out to the RIGHT
{
var normalVector = new Vector2(dirVector.y, -dirVector.x);
RoadSegment branchedSegment = CalcNewRoadSegment(segment.NodeTo, normalVector, 0);
globalGoalsRoads.Add(branchedSegment);
}
else if (branchRandom == 5) //At every other 40th points approx. the road branches out to the LEFT
{
var normalVector = new Vector2(-dirVector.y, dirVector.x);
RoadSegment branchedSegment = CalcNewRoadSegment(segment.NodeTo, normalVector, 0);
globalGoalsRoads.Add(branchedSegment);
}
else if (branchRandom == 6) //At every another 40th points approx. the road branches out to BOTH DIRECTIONS
{
var normalVector1 = new Vector2(dirVector.y, -dirVector.x);
var normalVector2 = new Vector2(-dirVector.y, dirVector.x);
RoadSegment branchedSegment1 = CalcNewRoadSegment(segment.NodeTo, normalVector1, 0);
RoadSegment branchedSegment2 = CalcNewRoadSegment(segment.NodeTo, normalVector2, 0);
globalGoalsRoads.Add(branchedSegment1);
globalGoalsRoads.Add(branchedSegment2);
}
//ROAD CONTINUE
globalGoalsRoads.Add(GetContinuingRoadSegment(segment));
foreach (RoadSegment newSegment in globalGoalsRoads)
{
queue.Add(newSegment);
}
}
public bool IsCrossing(RoadSegment road) //Check if the given road intersects with this road
{
//if (NodeFrom == road.NodeFrom || NodeFrom == road.NodeTo && NodeTo == road.NodeFrom || NodeTo == road.NodeTo) return true; //Two roadSegment is overlapping each other
if (NodeFrom == road.NodeFrom || NodeFrom == road.NodeTo || NodeTo == road.NodeFrom || NodeTo == road.NodeTo)
{
return(false); //One of the Nodes is the same (it doesnt count as an intersection now)
}
int o1 = Orientation(NodeFrom, NodeTo, road.NodeTo);
int o2 = Orientation(NodeFrom, NodeTo, road.NodeFrom);
int o3 = Orientation(road.NodeFrom, road.NodeTo, NodeFrom);
int o4 = Orientation(road.NodeFrom, road.NodeTo, NodeTo);
//General case
if (o1 != o2 && o3 != o4)
{
return(true);
}
//Special case (rare, but need to handle) - happens if two segments are collinear - we need to check if they are overlap or not
if (o1 == 0 && o2 == 0 && o3 == 0 && o4 == 0)
{
if (o1 == 0 && OnSegment(NodeFrom, NodeTo, road.NodeTo))
{
return(true);
}
if (o2 == 0 && OnSegment(NodeFrom, NodeTo, road.NodeFrom))
{
return(true);
}
if (o3 == 0 && OnSegment(road.NodeFrom, road.NodeTo, NodeFrom))
{
return(true);
}
if (o4 == 0 && OnSegment(road.NodeFrom, road.NodeTo, NodeTo))
{
return(true);
}
}
return(false);
}
private void GenerateStartSegments()
{
//First Generate a number nearby the middle quarter of the map
int sampleX = rand.Next(0, (border * 100));
int sampleY = rand.Next(0, (border * 100));
float starterX = (sampleX / 100.0f) - (float)border / 3;
float starterY = (sampleY / 100.0f) - (float)border / 3;
var startNode = new Node(starterX, starterY);
//Secondly Generate a vector which determines the two starting directions
int randomDirX = rand.Next(-100, 100);
int randomDirY = rand.Next(-100, 100);
var startDir = new Vector2(randomDirX, randomDirY);
var starterNodeTo1 = new Node(startNode.X + startDir.normalized.x * RoadLength, starterY + startDir.normalized.y * RoadLength);
var starterNodeTo2 = new Node(startNode.X - startDir.normalized.x * RoadLength, starterY - startDir.normalized.y * RoadLength);
//Thirdly We make two starting RoadSegment from these
var starterSegment1 = new RoadSegment(startNode, starterNodeTo1, 0);
var starterSegment2 = new RoadSegment(startNode, starterNodeTo2, 0);
queue.Add(starterSegment1);
queue.Add(starterSegment2);
}
private bool CheckLocalConstraint(RoadSegment segment)
{
//TRANSFORMATION
bool stretched = false;
foreach (RoadSegment road in hwSegments) //first check majorNodes
{
if (IsClose(segment.NodeTo, road.NodeTo))
{
segment.NodeTo = road.NodeTo;
segment.EndSegment = true;
stretched = true;
break;
}
}
if (!stretched)
{
foreach (RoadSegment road in segments) //then check minorNodes
{
if (IsClose(segment.NodeTo, road.NodeTo))
{
segment.NodeTo = road.NodeTo;
segment.EndSegment = true;
break;
}
}
}
//CHECKING CROSSING
foreach (RoadSegment road in hwSegments) //first check majorNodes
{
if (segment.IsCrossing(road))
{
return(false);
}
}
foreach (RoadSegment road in segments) //then check minorNodes
{
if (segment.IsCrossing(road))
{
return(false);
}
}
//CHECKING OTHER CONSTRAINTS
//Check if segment is out of border
if (segment.NodeFrom.X > border || segment.NodeFrom.X < -border ||
segment.NodeFrom.Y > border || segment.NodeFrom.Y < -border)
{
return(false);
}
//Check if segment would come into itself
if (segment.NodeFrom.X == segment.NodeTo.X && segment.NodeFrom.Y == segment.NodeTo.Y)
{
return(false);
}
//nodeTo or nodeFrom has more than 4 edges
if (segment.NodeTo.Edges.Count >= 4 || segment.NodeFrom.Edges.Count >= 4)
{
return(false);
}
if (!segment.NodeFrom.IsFree(
Mathf.Atan2(segment.NodeTo.Y - segment.NodeFrom.Y, segment.NodeTo.X - segment.NodeFrom.X)
))
{
return(false); //direction is not free from NodeFrom
}
if (!segment.NodeTo.IsFree(
Mathf.Atan2(segment.NodeFrom.Y - segment.NodeTo.Y, segment.NodeFrom.X - segment.NodeTo.X)
))
{
return(false); //direction is not free from NodeTo
}
return(true);
}
