public PixelSet Expand(Dictionary <PixelSet, PixelSet> rules)
{
if (Grid.Size % 2 == 0)
{
var pixelSets = new List <PixelSet>();
int squareY = 0;
for (int squareX = 0; squareX < Grid.Size / 2 && squareY < Grid.Size / 2;)
{
bool[,] square = new bool[2, 2];
for (int y = 0; y < 2; y++)
{
for (int x = 0; x < 2; x++)
{
square[x, y] = Grid.Squares[x + 2 * squareX, y + 2 * squareY];
}
}
var expandedSquare = new PixelSet(new Grid(square)).ApplyRules(rules);
pixelSets.Add(expandedSquare);
squareX++;
if (squareX % (Grid.Size / 2) == 0)
{
squareX = 0;
squareY += 1;
}
}
return(new PixelSet(pixelSets));
}
else
{
var pixelSets = new List <PixelSet>();
int squareY = 0;
for (int squareX = 0; squareX < Grid.Size / 3 && squareY < Grid.Size / 3;)
{
bool[,] square = new bool[3, 3];
for (int y = 0; y < 3; y++)
{
for (int x = 0; x < 3; x++)
{
square[x, y] = Grid.Squares[x + 3 * squareX, y + 3 * squareY];
}
}
var expandedSquare = new PixelSet(new Grid(square)).ApplyRules(rules);
pixelSets.Add(expandedSquare);
squareX++;
if (squareX % (Grid.Size / 3) == 0)
{
squareX = 0;
squareY += 1;
}
}
return(new PixelSet(pixelSets));
}
}
public static int CountPixelsOnAfterExpansion(IList <string> input, int iterations)
{
var initialPixelSet = new PixelSet(new Grid(".#./..#/###"));
var rules = ReadRules(input);
var expanded = initialPixelSet;
for (int i = 0; i < iterations; i++)
{
expanded = expanded.Expand(rules);
}
return(expanded.OnCount);
}
public void Expand()
{
var pixelSet = new PixelSet(new Grid(".#./..#/###"));
string[] input =
{
"../.# => ##./#../...",
".#./..#/### => #..#/..../..../#..#",
};
var rules = PixelArt.ReadRules(input);
var rotated = pixelSet.Expand(rules);
var expected = new PixelSet(new Grid("#..#/..../..../#..#"));
Assert.Equal(expected, rotated);
}
public static Dictionary <PixelSet, PixelSet> ReadRules(IList <string> input)
{
var rules = new Dictionary <PixelSet, PixelSet>();
foreach (var rule in input)
{
var ruleSplit = Regex.Split(rule, " => ");
var pixelInputDescription = ruleSplit[0];
var pixelOutputDescription = ruleSplit[1];
var pixelInput = new PixelSet(new Grid(pixelInputDescription));
var pixelOutput = new PixelSet(new Grid(pixelOutputDescription));
rules.Add(pixelInput, pixelOutput);
}
return(rules);
}
public void ConstructorList()
{
var pixelSet1 = new PixelSet(new Grid("##./#../..."));
var pixelSet2 = new PixelSet(new Grid("##./#../..."));
var pixelSet3 = new PixelSet(new Grid("##./#../..."));
var pixelSet4 = new PixelSet(new Grid("##./#../..."));
var pixelSet = new PixelSet(new List <PixelSet> {
pixelSet1,
pixelSet2,
pixelSet3,
pixelSet4,
});
var expectedPixelSet = new PixelSet(new Grid("##.##./#..#../....../##.##./#..#../......"));
Assert.Equal(expectedPixelSet, pixelSet);
}
protected bool Equals(PixelSet other)
{
return(Equals(Grid, other.Grid));
}