private void CreateBuildingOnRoad(Road road)
{
var cell = road.ParentCell;
const int offset = 6;
const float minDistance = 0.5f;
//Create an offset line of this road towards the inside of the cell
var offsetLine = road.GenerateOffsetParallelTowardsPoint(offset, cell.SitePoint);
//calculate total length of the line
var length = offsetLine.Length();
var traveled = minDistance;
//keep repeating until the end is reached
while (traveled < length - minDistance)
{
//get point on line using normalized values [0,1]
var pc = traveled / length;
var pos = offsetLine.FindRandomPointOnLine(pc, pc);
//Create a building site from this point
var bs = BuildingSite.FromPoint(pos);
bs.ParentRoad = road;
road.Buildings.Add(bs);
//travel along the line using the width of the building site
traveled += (minDistance + bs.Width / 2);
}
}
public BuildingSite(double x, double y)
: base(x,y)
{
Width = 15;
Height = 15;
UserData = null;
ParentRoad = null;
}
/// <summary>
/// Build a road inside a district cell
/// </summary>
public List <Road> BuildRoad(DistrictCell cell, bool generateInnerRoads, int subdivisions)
{
//Edges are the bounds of the road and will be part of the road as well
var edges = cell.Edges.ToList();
//find the longest line in the cell as a start line
var longest = FindLongestLineInCell(edges);
//a cell edge can be shared so first remove the line from one of the shared cells
//all edges of the cell are part of the road
var roads = new List <Road>();
foreach (var edge in cell.Edges)
{
//add the original side edge
var road = Road.FromLine(edge);
roads.Add(road);
}
var innerRoads = new List <Road>();
if (generateInnerRoads && subdivisions > 0)
{
//Create another subdivision
roads = GenerateRoad(roads, innerRoads, Road.FromLine(longest.Key), Road.FromLine(longest.Value), subdivisions - 1);
}
//set up a reference to the parent cell
foreach (var road in roads)
{
road.ParentCell = cell;
}
return(roads);
}
/// <summary>
/// Keep generating roads until branches are zero
/// </summary>
private List <Road> GenerateRoad(List <Road> roads, List <Road> inner, Road startLine, Road endLine, int branches)
{
//find a new start and end point
var start = startLine.Center();
var end = endLine.Center();
//When an intersection occurs break the line
HandlePossibleRoadIntersections(new Line(start, end), startLine, endLine, roads, inner);
//reduce branches to end recursion
branches--;
if (branches + 1 <= 0)
{
roads.AddRange(inner);
return(roads);
}
//From the pool of lines choose 2 random ones that aren't the same
var road1 = roads.GetRandomValue();
var road2 = roads.GetRandomValue();
//make sure both are unique
while (road1 == road2)
{
road2 = roads.GetRandomValue();
}
//generate a new road by connecting 2 roads
return(GenerateRoad(roads, inner, road1, road2, branches));
}
private void HandlePossibleRoadIntersections(Line line, Road startLine, Road endLine, List <Road> borders, List <Road> innerRoads)
{
bool flipped = false;
//check for possible intersection,
//if an intersection happens the end point becomes the point of intersection
//has to be reverse because otherwise the lines will intersect with the edges
for (var i = 0; i < innerRoads.Count; i++)
{
var l = innerRoads[i];
//if the line intersects
if (!line.IntersectsWith(l))
{
continue;
}
//find the intersection point
bool parallel = false;
var ip = line.FindIntersectionPoint(l, ref parallel);
//parrallel lines don't intersect so ignore
if (parallel)
{
continue;
}
//Create the new line from the intersection
line = CreateIntersectedLine(line, ip, ref flipped);
//Split the line that is intersected with in 2 new lines
if (flipped)
{
startLine = innerRoads[i];
}
else
{
endLine = innerRoads[i];
}
//stop at the first intersection
break;
}
//Because of the new line the start and end line will have to be split in 2 new lines
//the total of new lines will be 3
//Adjust the borders
borders.Remove(startLine);
borders.Remove(endLine);
//create the split lines
borders.Add(new Road(startLine.Start, line.Start));
borders.Add(new Road(line.Start, startLine.End));
borders.Add(new Road(endLine.Start, line.End));
borders.Add(new Road(line.End, endLine.End));
//Add the new road to the inner roads
innerRoads.Add(Road.FromLine(line));
innerRoads.Remove(startLine);
innerRoads.Remove(endLine);
}
private void HandlePossibleRoadIntersections(Line line, Road startLine, Road endLine,List<Road> borders,List<Road> innerRoads )
{
bool flipped = false;
//check for possible intersection,
//if an intersection happens the end point becomes the point of intersection
//has to be reverse because otherwise the lines will intersect with the edges
for (var i = 0; i < innerRoads.Count; i++)
{
var l = innerRoads[i];
//if the line intersects
if (!line.IntersectsWith(l)) continue;
//find the intersection point
bool parallel = false;
var ip = line.FindIntersectionPoint(l, ref parallel);
//parrallel lines don't intersect so ignore
if (parallel) continue;
//Create the new line from the intersection
line = CreateIntersectedLine(line, ip, ref flipped);
//Split the line that is intersected with in 2 new lines
if (flipped)
{
startLine = innerRoads[i];
}
else
{
endLine = innerRoads[i];
}
//stop at the first intersection
break;
}
//Because of the new line the start and end line will have to be split in 2 new lines
//the total of new lines will be 3
//Adjust the borders
borders.Remove(startLine);
borders.Remove(endLine);
//create the split lines
borders.Add(new Road(startLine.Start,line.Start));
borders.Add(new Road(line.Start, startLine.End));
borders.Add( new Road(endLine.Start, line.End));
borders.Add(new Road(line.End, endLine.End));
//Add the new road to the inner roads
innerRoads.Add(Road.FromLine(line));
innerRoads.Remove(startLine);
innerRoads.Remove(endLine);
}
/// <summary>
/// Keep generating roads until branches are zero
/// </summary>
private List<Road> GenerateRoad(List<Road> roads,List<Road> inner , Road startLine ,Road endLine, int branches)
{
//find a new start and end point
var start = startLine.Center();
var end = endLine.Center();
//When an intersection occurs break the line
HandlePossibleRoadIntersections(new Line(start,end),startLine,endLine, roads, inner);
//reduce branches to end recursion
branches--;
if (branches + 1 <= 0)
{
roads.AddRange(inner);
return roads;
}
//From the pool of lines choose 2 random ones that aren't the same
var road1 = roads.GetRandomValue();
var road2 = roads.GetRandomValue();
//make sure both are unique
while (road1 == road2)
{
road2 = roads.GetRandomValue();
}
//generate a new road by connecting 2 roads
return GenerateRoad(roads, inner, road1, road2, branches);
}
public void DrawRoad(Road road, Color linecolor, Color startColor, Color endColor, bool drawStartEnd = true, int width = 1)
{
//width = line.Intersected ? width + 1 : width;
DrawLine(road,linecolor, width);
if (drawStartEnd)
{
DrawPoint(road.Start, 7, Colors.Red);
DrawPoint(road.End, 7, Colors.Red);
}
var slope = road.Slope();
var pc = Color.FromRgb(50,50,50);
foreach (var building in road.Buildings)
{
DrawPoint(building, 4, pc);
//Draw bounds of the building
//DrawRectangle(building,building.Width,building.Height,pc);
var halfWidth = (building.Width/2);
var halfLength = (building.Height/2);
var boundX = new Point(building.X - halfWidth, building.Y - halfLength);
var boundY = new Point(building.X + halfWidth, building.Y + halfLength);
//DrawLine(boundY,boundX, pc, 1);
}
}
public static Road FromLine(Line l)
{
var r = new Road(l.Start, l.End)
{
CellLeft = l.CellLeft,
CellRight = l.CellRight
};
return r;
}
/// <summary>
/// Generate Buildings on the edges of the road
/// </summary>
private void GenerateBuildingsOnRoad(Road road)
{
//create building parent if none exists
if (_buildingParent == null)
{
_buildingParent = new GameObject("Buildings");
_buildingParent.SetParent(_townParent);
}
var cell = road.ParentCell;
int offset = _terrainSettings.RoadWidth;
const float minDistance = 0.2f;
//access building prefabs for this cell
var prefabs = GetPrefabsForType(cell.DistrictType);
if (prefabs == null)
{
return;
}
//Create an offset line of this road towards the inside of the cell
var offsetLine = road.GenerateOffsetParallelTowardsPoint(offset, cell.SitePoint);
//calculate total length of the line
var length = offsetLine.Length();
var traveled = minDistance * 2;
//keep repeating until the end is reached
while (traveled < length - (minDistance * 2))
{
//get point on line using normalized values [0,1]
var pc = traveled / length;
var pos = offsetLine.FindRandomPointOnLine(pc, pc);
//Select a random prefab
var prefab = prefabs.GetRandomValue();
//Create a building site from this point
var bs = BuildingSite.FromPoint(pos);
bs.ParentRoad = road;
//Spawn the building
SpawnBuilding(pos.ToVector3(), prefab, bs);
//travel along the line using the width of the building site
traveled += (minDistance + bs.Width / 2);
}
}
/// <summary>
/// traverse a road line and draw the road texture on the terrain
/// </summary>
private void DrawRoad(Road road)
{
//road texture is always the 1st splatmap of the terrain
const int roadTextureIndex = 0;
const float inc = 0.05f;
var roadWidth = _terrainSettings.RoadWidth;
//Get start and end position of the road
var start = road.Start.ToVector3();
var end = road.End.ToVector3();
//calculate distance between the start and end
var distance = Vector3.Distance(start, end);
//change texture at start position
ChangeTerrainTexture(start, roadTextureIndex, roadWidth);
//go from start to the end and change the texture at each position
var currPos = Vector3.MoveTowards(start, end, inc);
for (var i = 0; i <= distance / inc; i++)
{
ChangeTerrainTexture(currPos, roadTextureIndex, roadWidth);
currPos = Vector3.MoveTowards(currPos, end, inc);
}
//change texture at end position
ChangeTerrainTexture(end, roadTextureIndex, roadWidth);
}
