public TerrainPoint GetTerrainAt(GameCoordinate coordinates)
{
var altitude = GetAltitude(this.altitude.GetValue(coordinates));
var heat = GetHeat(this.heat.GetValue(coordinates), altitude);
var humidity = GetHumidity(this.humidity.GetValue(coordinates), heat);
return(new TerrainPoint(
coordinates,
humidity,
heat,
altitude,
(FeatureBlend(feature, coordinates) / sumFractalRange).Clamp(-1, 1)
));
}
private float FeatureBlend(IModule2D feature, GameCoordinate coordinates)
{
const float multFactor = 6000;
const float stepSize = 100;
// guarantees coords as 0 <= coord < stepSize
var onex = ((coordinates.x % stepSize) + stepSize) % stepSize;
var oney = ((coordinates.y % stepSize) + stepSize) % stepSize;
var altx = onex + stepSize;
var alty = oney + stepSize;
var xWeight = onex / stepSize;
var yWeight = oney / stepSize;
var invXWeight = 1 - xWeight;
var invYWeight = 1 - yWeight;
return(feature.GetValue(onex * multFactor, oney * multFactor) * xWeight * yWeight
+ feature.GetValue(altx * multFactor, oney * multFactor) * invXWeight * yWeight
+ feature.GetValue(onex * multFactor, alty * multFactor) * xWeight * invYWeight
+ feature.GetValue(altx * multFactor, alty * multFactor) * invXWeight * invYWeight);
}
public TerrainPoint(GameCoordinate coordinates, float humidity, float heat, float altitude, float feature)
{
this.coordinates = coordinates;
this.humidity = humidity;
this.heat = heat;
this.altitude = altitude;
this.feature = feature;
temperatureCategory = (TemperatureCategory)tempsStep.FindIndex(t => t > heat);
humidityCategory = (HumidityCategory)Math.Min(
BiomeDetails.biomeLabels[temperatureCategory].Count - 1,
Math.Floor((int)HumidityCategory.Superhumid * (this.humidity / 2 + 0.5f))
);
altitudeCategory = (AltitudeCategory)altitudeStep.FindIndex(t => t > altitude);
//System.Diagnostics.Debug.Assert(temperatureCategory >= TemperatureCategory.Polar && temperatureCategory <= TemperatureCategory.Tropical);
//System.Diagnostics.Debug.Assert(humidityCategory >= HumidityCategory.Superarid && humidityCategory <= HumidityCategory.Superhumid);
//System.Diagnostics.Debug.Assert(altitudeCategory >= AltitudeCategory.DeepWater && altitudeCategory <= AltitudeCategory.Mountain);
}
public static float GetValue(this IModule2D module, GameCoordinate coordinates) => module.GetValue(coordinates.x, coordinates.y);