private static ITopoArray <T> RotateInner <T>(ITopoArray <T> original, Func <int, int, ValueTuple <int, int> > mapCoord, TileRotate <T> tileRotate = null)
{
var originalTopology = original.Topology.AsGridTopology();
// Find new bounds
var(x1, y1) = mapCoord(0, 0);
var(x2, y2) = mapCoord(originalTopology.Width - 1, 0);
var(x3, y3) = mapCoord(originalTopology.Width - 1, originalTopology.Height - 1);
var(x4, y4) = mapCoord(0, originalTopology.Height - 1);
var minx = Math.Min(Math.Min(x1, x2), Math.Min(x3, x4));
var maxx = Math.Max(Math.Max(x1, x2), Math.Max(x3, x4));
var miny = Math.Min(Math.Min(y1, y2), Math.Min(y3, y4));
var maxy = Math.Max(Math.Max(y1, y2), Math.Max(y3, y4));
// Arrange so that co-ordinate transfer is into the rect bounced by width, height
var offsetx = -minx;
var offsety = -miny;
var width = maxx - minx + 1;
var height = maxy - miny + 1;
var depth = originalTopology.Depth;
var mask = new bool[width * height * depth];
var topology = new GridTopology(originalTopology.Directions, width, height, originalTopology.Depth, false, false, false, mask);
var values = new T[width, height, depth];
// Copy from original to values based on the rotation, setting up the mask as we go.
for (var z = 0; z < originalTopology.Depth; z++)
{
for (var y = 0; y < originalTopology.Height; y++)
{
for (var x = 0; x < originalTopology.Width; x++)
{
var(newX, newY) = mapCoord(x, y);
newX += offsetx;
newY += offsety;
int newIndex = topology.GetIndex(newX, newY, z);
var newValue = original.Get(x, y, z);
bool hasNewValue = true;
if (tileRotate != null)
{
hasNewValue = tileRotate(newValue, out newValue);
}
values[newX, newY, z] = newValue;
mask[newIndex] = hasNewValue && originalTopology.ContainsIndex(originalTopology.GetIndex(x, y, z));
}
}
}
return(new TopoArray3D <T>(values, topology));
}
/// <summary>
/// Constructs an <see cref="ITopoArray{T}"/> by invoking f at each location in the topology.
/// </summary>
public static ITopoArray <T> CreateByPoint <T>(Func <Point, T> f, GridTopology topology)
{
var array = new T[topology.Width, topology.Height, topology.Depth];
for (var z = 0; z < topology.Depth; z++)
{
for (var y = 0; y < topology.Height; y++)
{
for (var x = 0; x < topology.Width; x++)
{
var index = topology.GetIndex(x, y, z);
if (topology.ContainsIndex(index))
{
array[x, y, z] = f(new Point(x, y, z));
}
}
}
}
return(Create(array, topology));
}