private GeologyTerrain[,] ConvertToGeology(Map1 map, float refinement)
{
GeologyTerrain[,] geologyTerrains = new GeologyTerrain[(int)map.Width, (int)map.Height];
for (int i = 0; i < map.Width; ++i)
{
for (int j = 0; j < map.Height; ++j)
{
geologyTerrains[i, j] = new GeologyTerrain();
}
}
foreach (var center in map.Graph.centers)
{
float perlinNoise = Mathf.PerlinNoise(refinement + (int)center.point.x, refinement + (int)center.point.y);
eGeology geology = GetGeology(perlinNoise);
geologyTerrains.FillPolygon(center.corners.Select(p => p.point * _textureScale).ToArray(), geology);
}
return(geologyTerrains);
}
public static void FillPolygon(this GeologyTerrain[,] geologyTerrains, Vector2[] points, eGeology geology)
{
// http://alienryderflex.com/polygon_fill/
var IMAGE_BOT = (int)points.Max(p => p.y);
var IMAGE_TOP = (int)points.Min(p => p.y);
var IMAGE_LEFT = (int)points.Min(p => p.x);
var IMAGE_RIGHT = (int)points.Max(p => p.x);
var MAX_POLY_CORNERS = points.Count();
var polyCorners = MAX_POLY_CORNERS;
var polyY = points.Select(p => p.y).ToArray();
var polyX = points.Select(p => p.x).ToArray();
int[] nodeX = new int[MAX_POLY_CORNERS];
int nodes, pixelX, i, j, swap;
// Loop through the rows of the image.
for (int pixelY = IMAGE_TOP; pixelY <= IMAGE_BOT; pixelY++)
{
// Build a list of nodes.
nodes = 0;
j = polyCorners - 1;
for (i = 0; i < polyCorners; i++)
{
if (polyY[i] < (float)pixelY && polyY[j] >= (float)pixelY || polyY[j] < (float)pixelY && polyY[i] >= (float)pixelY)
{
nodeX[nodes++] = (int)(polyX[i] + (pixelY - polyY[i]) / (polyY[j] - polyY[i]) * (polyX[j] - polyX[i]));
}
j = i;
}
// Sort the nodes, via a simple “Bubble” sort.
i = 0;
while (i < nodes - 1)
{
if (nodeX[i] > nodeX[i + 1])
{
swap = nodeX[i]; nodeX[i] = nodeX[i + 1]; nodeX[i + 1] = swap; if (i != 0)
{
i--;
}
}
else
{
i++;
}
}
// Fill the pixels between node pairs.
for (i = 0; i < nodes; i += 2)
{
if (nodeX[i] >= IMAGE_RIGHT)
{
break;
}
if (nodeX[i + 1] > IMAGE_LEFT)
{
if (nodeX[i] < IMAGE_LEFT)
{
nodeX[i] = IMAGE_LEFT;
}
if (nodeX[i + 1] > IMAGE_RIGHT)
{
nodeX[i + 1] = IMAGE_RIGHT;
}
for (j = nodeX[i]; j < nodeX[i + 1]; j++)
{
if (geologyTerrains.GetLength(0) <= j || geologyTerrains.GetLength(1) <= pixelY)
{
continue;
}
geologyTerrains[j, pixelY].geology = geology;
}
}
}
}
}
