private List <DistrictCell> GenerateDistrictCells(VoronoiDiagram voronoi)
{
//Create a district cell from the voronoi cells
var districtCells = new List <DistrictCell>();
foreach (var cell in voronoi.GetCellsInBounds())
{
//ignore cells that are not valid
if (cell.Edges.Count < 2)
{
continue;
}
districtCells.Add(DistrictCell.FromCell(cell, _citySettings.DistrictSettings[0].Type));
}
//tag random cells based on the settings for each district
foreach (var setting in _citySettings.DistrictSettings)
{
for (int i = 0; i < setting.Frequency; ++i)
{
//Get a random start cell from the voronoi
var startCell = districtCells.GetRandomValue();
//size is a ratio of the width and length of the plane
var size = setting.Size * ((voronoi.Bounds.Right + voronoi.Bounds.Bottom) / 8);
//tag cell
districtCells.TagCells(startCell, size, setting.Type);
}
}
return(districtCells);
}
/// <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;
}
public static DistrictCell FromCell(Cell c, string type)
{
var dc = new DistrictCell(type)
{
Edges = c.Edges,
SitePoint = c.SitePoint,
Points = c.Points
};
return(dc);
}
public static void TagCells(this List<DistrictCell> cells, DistrictCell startCell, double radius,string tag)
{
//go over all cells
foreach (var cell in cells)
{
//get cell center
var cellCenter = cell.SitePoint;
//Calculate distance between current cell and the start cell
var distance = MathHelpers.DistanceBetweenPoints(startCell.SitePoint, cellCenter);
//if it is within range add the cell
if (distance < radius)
{
cell.DistrictType = tag;
}
}
}
public static void TagCells(this List <DistrictCell> cells, DistrictCell startCell, double radius, string tag)
{
//go over all cells
foreach (var cell in cells)
{
//get cell center
var cellCenter = cell.SitePoint;
//Calculate distance between current cell and the start cell
var distance = MathHelpers.DistanceBetweenPoints(startCell.SitePoint, cellCenter);
//if it is within range add the cell
if (distance < radius)
{
cell.DistrictType = tag;
}
}
}
/// <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);
}
public static DistrictCell FromCell(Cell c, string type)
{
var dc = new DistrictCell(type)
{
Edges = c.Edges,
SitePoint = c.SitePoint,
Points = c.Points
};
return dc;
}
/// <summary>
/// Generate some additional gameobjects to the inside of a cell
/// </summary>
private void GenerateObjectsInCell(DistrictCell cell)
{
//using an inset create a smaller cell from the cell
//this is to avoid spawning objects on buildings or roads
var insetCell = cell.Inset(_terrainSettings.RoadWidth/2);
var amount = _terrainSettings.AdditionalProps;
//Generate the spawn points inside the cell
var points = insetCell.GenerateRandomPoints(Random.Range(amount - 5, amount + 5));
foreach (var p in points)
{
//create a 3D vector from the 2D point
var position = p.ToVector3();
//randomize what will spawn
var r = Random.value;
//spawn a tree
if (r < 0.75)
{
SpawnTree(position);
}
else if(r < 0.85f) //Spawn a prop
{
SpawnProp(position);
}
else
{
//nothing
}
}
}