public static void Find(byte[] alphaData, int alphaWidth, int alphaHeight)
{
if (D2dHelper.AlphaIsValid(alphaData, alphaWidth, alphaHeight) == false)
{
throw new System.ArgumentException("Invalid alpha");
}
minX = 0;
maxX = alphaWidth;
minY = 0;
maxY = alphaHeight;
sizeX = alphaWidth;
sizeY = alphaHeight;
total = sizeX * sizeY;
if (cells == null || cells.Length < total)
{
cells = new byte[total];
}
DespawnTempIslands();
// Find all solid pixels
for (var i = 0; i < total; i++)
{
cells[i] = alphaData[i] > 127 ? CELL_SOLID : CELL_EMPTY;
}
for (var i = 0; i < total; i++)
{
if (cells[i] == CELL_SOLID)
{
currentIsland = SpawnTempIsland();
BeginFloodFill(i, i % sizeX, i / sizeX);
}
}
}
public static Island FindLocal(byte[] alphaData, int alphaWidth, int alphaHeight, D2dRect findRect)
{
if (D2dHelper.AlphaIsValid(alphaData, alphaWidth, alphaHeight) == false)
{
Debug.LogError("Alpha data invalid"); return(null);
}
var oldRect = new D2dRect(0, alphaWidth, 0, alphaHeight);
var lapRect = D2dRect.CalculateOverlap(oldRect, findRect);
if (lapRect.IsSet == false)
{
return(null);
}
minX = lapRect.MinX;
maxX = lapRect.MaxX;
minY = lapRect.MinY;
maxY = lapRect.MaxY;
sizeX = lapRect.SizeX;
sizeY = lapRect.SizeY;
total = sizeX * sizeY;
spreadCount = 0;
if (cells == null || cells.Length < total)
{
cells = new byte[total];
}
DespawnTempIslands();
// Write solid or empty cells
for (var y = minY; y < maxY; y++)
{
var c = (y - minY) * sizeX - minX;
var d = y * alphaWidth;
for (var x = minX; x < maxX; x++)
{
cells[c + x] = alphaData[d + x] > 127 ? CELL_SOLID : CELL_EMPTY;
}
}
var borderIsland = default(Island);
// Border coming from left?
if (minX > 0)
{
for (var y = 0; y < sizeY; y++)
{
var i = y * sizeX;
if (cells[i] == CELL_SOLID)
{
if (borderIsland == null)
{
borderIsland = currentIsland = SpawnTempIsland(false);
}
BeginFloodFill(i, i % sizeX, i / sizeX);
}
}
}
// Border coming from right?
if (maxX < alphaWidth)
{
for (var y = 0; y < sizeY; y++)
{
var i = y * sizeX + sizeX - 1;
if (cells[i] == CELL_SOLID)
{
if (borderIsland == null)
{
borderIsland = currentIsland = SpawnTempIsland(false);
}
BeginFloodFill(i, i % sizeX, i / sizeX);
}
}
}
// Border coming from bottom?
if (minY > 0)
{
for (var x = 0; x < sizeX; x++)
{
var i = x;
if (cells[i] == CELL_SOLID)
{
if (borderIsland == null)
{
borderIsland = currentIsland = SpawnTempIsland(false);
}
BeginFloodFill(i, i % sizeX, i / sizeX);
}
}
}
// Border coming from top?
if (maxY < alphaHeight)
{
for (var x = 0; x < sizeX; x++)
{
var i = x + sizeX * (sizeY - 1);
if (cells[i] == CELL_SOLID)
{
if (borderIsland == null)
{
borderIsland = currentIsland = SpawnTempIsland(false);
}
BeginFloodFill(i, i % sizeX, i / sizeX);
}
}
}
for (var i = 0; i < total; i++)
{
if (cells[i] == CELL_SOLID)
{
currentIsland = SpawnTempIsland();
BeginFloodFill(i, i % sizeX, i / sizeX);
}
}
return(borderIsland);
}
