protected bool makeStreets(
RoadSegment <MetaInformation> approvedSeg,
List <RoadSegment <MetaInformation> > potentialSegs)
{
// Vaialble declarations
bool branchAppeared = false;
var pendingBranchSegs = new List <RoadSegment <MetaInformation> >();
float branchDigreeDiff = 0f;
Road approvedRoad = approvedSeg.getLastRoad();
// If segment grows beyond the fixed length,
// several branches will appear.
if (approvedSeg.TotalLength >= Config.STREET_SEGMENT_MAX_LENGTH)
{
branchAppeared = true;
}
// growth segment will grow along last segment.
var pendingGrowthSegs = new List <RoadSegment <MetaInformation> >();
float growthDigreeDiff = Config.STREET_GROWTH_MAX_DEGREE - Config.STREET_GROWTH_MIN_DEGREE;
// branch segment will make a branch from the end.
if (branchAppeared)
{
branchDigreeDiff = Config.STREET_BRANCH_MAX_DEGREE - Config.STREET_BRANCH_MIN_DEGREE;
}
for (int i = 0; i < 4; ++i)
{
// get a growth digree randomly
float growthDigree = Random.Range(-growthDigreeDiff, growthDigreeDiff);
growthDigree += (growthDigree > 0) ?
Config.STREET_GROWTH_MIN_DEGREE : -Config.STREET_GROWTH_MIN_DEGREE;
// figure out the end point of new road
var rotation = Quaternion.Euler(0, growthDigree, 0);
var potentialRoadEnd = approvedRoad.end.position +
rotation * approvedRoad.Direction.normalized * Config.STREET_DEFAULT_LENGTH;
// create new road
var potentialRoad = new Road(approvedRoad.end, potentialRoadEnd, Config.STREET_DEFAULT_WIDTH);
var metaInfo = new StreetMetaInfo();
metaInfo.populationDensity = perlin.getValue(potentialRoadEnd.x, potentialRoadEnd.z);
var potentialSeg = new RoadSegment <MetaInformation>(0, potentialRoad, metaInfo);
pendingGrowthSegs.Add(potentialSeg);
if (branchAppeared)
{
// get a branch digree randomly
float branchDigree = Random.Range(-branchDigreeDiff, branchDigreeDiff);
branchDigree += (branchDigree > 0) ?
Config.STREET_BRANCH_MIN_DEGREE : -Config.STREET_BRANCH_MIN_DEGREE;
// Original solution 1:
// While a branch is being generated, it will appear at
// the centre of whole segment. This is to avoid those
// which are too close to other roads.
var branchStart =
approvedSeg.roads[approvedSeg.roads.Count / 2].start;
// figure out the end point of new branch road
rotation = Quaternion.Euler(0, branchDigree, 0);
potentialRoadEnd = branchStart.position +
rotation * approvedRoad.Direction.normalized * Config.STREET_DEFAULT_LENGTH;
// create new branch road
// appears where people live only
var populationDensity = perlin.getValue(potentialRoadEnd.x, potentialRoadEnd.z);
if (populationDensity > Config.MIN_STREET_APPEAR_POPULATION_DENSITY_VALUE)
{
potentialRoad = new Road(branchStart, potentialRoadEnd, Config.STREET_DEFAULT_WIDTH);
var streetMetaInfo = new StreetMetaInfo();
streetMetaInfo.populationDensity = populationDensity;
potentialSeg = new RoadSegment <MetaInformation>(0, potentialRoad, streetMetaInfo);
pendingBranchSegs.Add(potentialSeg);
}
}
}
// pick out the road where has the most population density
var maxDensityGrowthRoad =
pendingGrowthSegs
.OrderByDescending(x => ((StreetMetaInfo)x.metaInformation).populationDensity)
.FirstOrDefault();
if (branchAppeared)
{
var maxDensityBranchRoad =
pendingBranchSegs
.OrderByDescending(x => ((StreetMetaInfo)x.metaInformation).populationDensity)
.Take(1);
// add the street
potentialSegs.AddRange(maxDensityBranchRoad);
// as for growth road, add it to result directly
if (maxDensityBranchRoad.Count() > 0)
{
potentialSegs.Add(maxDensityGrowthRoad);
}
}
else
{
// segment grows
approvedSeg.grow(maxDensityGrowthRoad.getLastRoad());
approvedSeg.metaInformation = maxDensityGrowthRoad.metaInformation;
potentialSegs.Add(approvedSeg);
}
return(potentialSegs.Count > 0);
}
protected bool makeHighwaysByPopulationDensity(
RoadSegment <MetaInformation> approvedSeg,
List <RoadSegment <MetaInformation> > potentialSegs)
{
// Vaialble declarations
bool highwayBranchAppeared = false;
var pendingBranchSegs = new List <RoadSegment <MetaInformation> >();
float branchDigreeDiff = 0f;
// If segment grows beyond the fixed length,
// several branches will appear.
if (approvedSeg.TotalLength >= Config.HIGHWAY_SEGMENT_MAX_LENGTH)
{
highwayBranchAppeared = true;
}
// growth segment will grow along last segment.
var pendingGrowthSegs = new List <RoadSegment <MetaInformation> >();
float growthDigreeDiff = Config.HIGHWAY_GROWTH_MAX_DEGREE - Config.HIGHWAY_GROWTH_MIN_DEGREE;
// branch segment will make a branch from the end.
if (highwayBranchAppeared)
{
branchDigreeDiff = Config.HIGHWAY_BRANCH_MAX_DEGREE - Config.HIGHWAY_BRANCH_MIN_DEGREE;
}
else
{
branchDigreeDiff = Config.STREET_BRANCH_MAX_DEGREE - Config.STREET_BRANCH_MIN_DEGREE;
}
Road approvedRoad = approvedSeg.getLastRoad();
for (int i = 0; i < 4; ++i)
{
// get a growth digree randomly
float growthDigree = Random.Range(-growthDigreeDiff, growthDigreeDiff);
growthDigree += (growthDigree > 0) ?
Config.HIGHWAY_GROWTH_MIN_DEGREE : -Config.HIGHWAY_GROWTH_MIN_DEGREE;
// figure out the end point of new road
var rotation = Quaternion.Euler(0, growthDigree, 0);
var potentialRoadEnd = approvedRoad.end.position +
rotation * approvedRoad.Direction.normalized * Config.HIGHWAY_DEFAULT_LENGTH;
// create new road
var potentialRoad = new Road(approvedRoad.end, potentialRoadEnd, Config.HIGHWAY_DEFAULT_WIDTH);
var metaInfo = new HighwayMetaInfo();
metaInfo.populationDensity = perlin.getValue(potentialRoadEnd.x, potentialRoadEnd.z);
var potentialSeg = new RoadSegment <MetaInformation>(0, potentialRoad, metaInfo);
pendingGrowthSegs.Add(potentialSeg);
if (highwayBranchAppeared)
{
// get a branch digree randomly
float branchDigree = Random.Range(-branchDigreeDiff, branchDigreeDiff);
branchDigree += (branchDigree > 0) ?
Config.HIGHWAY_BRANCH_MIN_DEGREE : -Config.HIGHWAY_BRANCH_MIN_DEGREE;
// figure out the end point of new branch road
rotation = Quaternion.Euler(0, branchDigree, 0);
potentialRoadEnd = approvedRoad.end.position +
rotation * approvedRoad.Direction.normalized * Config.HIGHWAY_DEFAULT_LENGTH;
// create new branch road
potentialRoad = new Road(approvedRoad.end, potentialRoadEnd, Config.HIGHWAY_DEFAULT_WIDTH);
metaInfo = new HighwayMetaInfo();
metaInfo.populationDensity = perlin.getValue(potentialRoadEnd.x, potentialRoadEnd.z);
potentialSeg = new RoadSegment <MetaInformation>(0, potentialRoad, metaInfo);
pendingBranchSegs.Add(potentialSeg);
}
else
{
// get a branch digree randomly
float branchDigree = Random.Range(-branchDigreeDiff, branchDigreeDiff);
branchDigree += (branchDigree > 0) ?
Config.STREET_BRANCH_MIN_DEGREE : -Config.STREET_BRANCH_MIN_DEGREE;
// figure out the end point of new branch road
rotation = Quaternion.Euler(0, branchDigree, 0);
potentialRoadEnd = approvedRoad.end.position +
rotation * approvedRoad.Direction.normalized * Config.STREET_DEFAULT_LENGTH;
// create new branch road
// appears where people live only
var populationDensity = perlin.getValue(potentialRoadEnd.x, potentialRoadEnd.z);
if (populationDensity > Config.MIN_POPULATION_DENSITY_VALUE + 0.15f)
{
potentialRoad = new Road(approvedRoad.end, potentialRoadEnd, Config.STREET_DEFAULT_WIDTH);
var streetMetaInfo = new StreetMetaInfo();
streetMetaInfo.populationDensity = populationDensity;
potentialSeg = new RoadSegment <MetaInformation>(0, potentialRoad, streetMetaInfo);
pendingBranchSegs.Add(potentialSeg);
}
}
}
// pick out the road where has the most population density
var maxDensityGrowthRoad =
pendingGrowthSegs
.OrderByDescending(x => ((HighwayMetaInfo)x.metaInformation).populationDensity)
.FirstOrDefault();
if (highwayBranchAppeared)
{
var maxDensityBranchRoad =
pendingBranchSegs
.OrderByDescending(x => ((HighwayMetaInfo)x.metaInformation).populationDensity)
.Take(1);
// as for growth road, add it to result directly
potentialSegs.Add(maxDensityGrowthRoad);
// as for branch road, add if it has higher population density
var growthRoadDensity = ((HighwayMetaInfo)maxDensityGrowthRoad.metaInformation).populationDensity;
foreach (var road in maxDensityBranchRoad)
{
if (((HighwayMetaInfo)road.metaInformation).populationDensity > growthRoadDensity)
{
potentialSegs.Add(road);
}
else
{
break;
}
}
}
else
{
var maxDensityBranchRoad =
pendingBranchSegs
.OrderByDescending(x => ((StreetMetaInfo)x.metaInformation).populationDensity)
.Take(1);
// segment grows
approvedSeg.grow(maxDensityGrowthRoad.getLastRoad());
approvedSeg.metaInformation = maxDensityGrowthRoad.metaInformation;
potentialSegs.Add(approvedSeg);
// add the street
potentialSegs.AddRange(maxDensityBranchRoad);
}
return(potentialSegs.Count > 0);
}
