public static ArrayGrid <T> MapToSubGrid <T>(this ArrayGrid <T> grid, Vector2Int sourceAreaPos, Vector2Int sourceAreaSize, Vector2Int subGridSize, bool clampOutOfBounds = true)
{
if (!clampOutOfBounds)
{
if (!grid.IsValidPosition(sourceAreaPos))
{
return(new ArrayGrid <T>());
}
if (!grid.IsValidPosition(sourceAreaPos + sourceAreaSize - Vector2Int.one))
{
return(new ArrayGrid <T>());
}
}
else
{
sourceAreaPos.Clamp(Vector2Int.zero, grid.MaxValidPosition);
Vector2Int sourceAreaMax = sourceAreaPos + sourceAreaSize;
sourceAreaMax.Clamp(Vector2Int.zero, grid.Size);
sourceAreaSize = sourceAreaMax - sourceAreaPos;
if (sourceAreaSize.x <= 0 || sourceAreaSize.y <= 0)
{
return(new ArrayGrid <T>());
}
}
ArrayGrid <T> subGrid = new ArrayGrid <T>(subGridSize);
var subGridIter = subGrid.GetEnumerator2D();
Vector2 scale = new Vector2((float)sourceAreaSize.x / subGridSize.x, (float)sourceAreaSize.y / subGridSize.y);
while (subGridIter.MoveNext())
{
Vector2Int subCurrent = subGridIter.Current;
Vector2 scaledSubCurrent = new Vector2(subCurrent.x * scale.x, subCurrent.y * scale.y);
Vector2Int sourcePos = sourceAreaPos + Vector2Int.FloorToInt(scaledSubCurrent);
subGrid[subCurrent] = grid[sourcePos];
}
return(subGrid);
}
