public static VoronoiData Create(int width, int height, int regionCount, int seed)
{
var data = new VoronoiData
{
width = width,
height = height,
centroids = new Vector2Int[regionCount],
regionCount = regionCount,
regionData = new int[width * height]
};
var rng = new System.Random(seed);
for (var i = 0; i < data.regionCount; i++)
{
data.centroids[i] = new Vector2Int(rng.Next(0, data.width), rng.Next(0, data.height));
}
//Generate Region Data for each 'pixel'
for (var y = 0; y < data.height; y++)
{
for (var x = 0; x < data.width; x++)
{
var index = y * data.width + x;
var pt = new Vector2Int(x, y);
data.regionData[index] = GetClosestCentroidIndex(pt, data.centroids);
}
}
return(data);
}
public static Texture2D CreateFalloffTexture(VoronoiData data)
{
var distances = new float[data.width * data.height];
for (var y = 0; y < data.height; y++)
{
for (var x = 0; x < data.width; x++)
{
var pt = new Vector2Int(x, y);
var index = y * data.width + x;
var regionIndex = data.regionData[index];
distances[index] = Vector2.Distance(pt, data.centroids[regionIndex]);
}
}
var maxDistance = distances.Max();
var pixelColors = new Color[data.width * data.height];
for (var i = 0; i < distances.Length; i++)
{
var val = Mathf.Clamp01(distances[i] / maxDistance);
pixelColors[i] = new Color(val, val, val, 1f);
}
return(CreateTextureFromColorArray(pixelColors, data.width, data.height));
}
public static Texture2D CreateBorderTexture(VoronoiData data)
{
var pixelColors = new Color[data.width * data.height];
for (var y = 0; y < data.height; y++)
{
for (var x = 0; x < data.width; x++)
{
var pixelIndex = y * data.width + x;
if (x - 1 < 0 || x + 1 >= data.width)
{
pixelColors[pixelIndex] = Color.white;
}
else if (y - 1 < 0 || y + 1 >= data.height)
{
pixelColors[pixelIndex] = Color.white;
}
else
{
var up = (y + 1) * data.width + x;
var down = (y - 1) * data.width + x;
var left = y * data.width + x - 1;
var right = y * data.width + x + 1;
var thisRegion = data.regionData[pixelIndex];
var upRegion = data.regionData[up];
var downRegion = data.regionData[down];
var leftRegion = data.regionData[left];
var rightRegion = data.regionData[right];
if ((thisRegion == upRegion) &&
(thisRegion == downRegion) &&
(thisRegion == leftRegion) &&
(thisRegion == rightRegion))
{
pixelColors[pixelIndex] = Color.black;
}
else
{
pixelColors[pixelIndex] = Color.white;
}
}
}
}
return(CreateTextureFromColorArray(pixelColors, data.width, data.height));
}
public static Texture2D CreateTexture(VoronoiData data)
{
//Randomly select some colors
var regionColors = new Color[data.regionCount];
for (var i = 0; i < data.regionCount; i++)
{
regionColors[i] = new Color(Random.Range(0f, 1f), Random.Range(0f, 1f), Random.Range(0f, 1f), 1f);
}
var pixelColors = new Color[data.width * data.height];
for (var y = 0; y < data.height; y++)
{
for (var x = 0; x < data.width; x++)
{
var index = y * data.width + x;
pixelColors[index] = regionColors[data.regionData[index]];
}
}
return(CreateTextureFromColorArray(pixelColors, data.width, data.height));
}