public Input(Color[,] _data, Vector2i patternSize, bool periodicX, bool periodicY,
bool useRotations, bool useReflections)
{
PeriodicX = periodicX;
PeriodicY = periodicY;
OriginalPatternSize = patternSize;
//Copy the color data.
data = new Color[_data.GetLength(0), _data.GetLength(1)];
foreach (Vector2i pos in data.AllIndices())
{
this[pos] = _data.Get(pos);
}
//Compute the average color.
float sumR = 0.0f,
sumG = 0.0f,
sumB = 0.0f;
foreach (Vector2i pos in data.AllIndices())
{
Color color = data.Get(pos);
sumR += color.R;
sumG += color.G;
sumB += color.B;
}
float invN = 1.0f / (data.SizeX() * data.SizeY());
AverageColor = Color.FromArgb((byte)Math.Max(0, Math.Min(255, (int)(sumR * invN))),
(byte)Math.Max(0, Math.Min(255, (int)(sumG * invN))),
(byte)Math.Max(0, Math.Min(255, (int)(sumB * invN))));
//Get the list of transformations we'll be using on the input data.
List <Transforms> transformations = new List <Transforms>()
{
Transforms.None
};
if (useReflections)
{
transformations.Add(Transforms.MirrorX);
transformations.Add(Transforms.MirrorY);
}
//The use of rotations also determines our maximum pattern size along each axis.
if (useRotations)
{
transformations.Add(Transforms.Rotate90CW);
transformations.Add(Transforms.Rotate270CW);
transformations.Add(Transforms.Rotate180);
int maxPatternSize = Math.Max(OriginalPatternSize.x, OriginalPatternSize.y);
MaxPatternSize = new Vector2i(maxPatternSize, maxPatternSize);
}
else
{
MaxPatternSize = OriginalPatternSize;
}
//For every pixel in the input, create one pattern starting from that pixel
// for each type of transformation.
Patterns = new List <Pattern>(Size.x * Size.y * transformations.Count);
//If the input is periodic, we can make our patterns all the way
// to the max edge of the input.
//Otherwise, we have to back off the max edge a bit.
Vector2i maxPatternMinCorner = Size - 1;
if (!PeriodicX)
{
maxPatternMinCorner.x -= patternSize.x;
}
if (!PeriodicY)
{
maxPatternMinCorner.y -= patternSize.y;
}
foreach (Vector2i patternMinCornerPos in new Vector2i.Iterator(maxPatternMinCorner + 1))
{
foreach (var transform in transformations)
{
Patterns.Add(new Pattern(this, patternMinCornerPos, patternSize, transform));
}
}
//Remove identical patterns, using hashes to compare them quickly.
List <int> patternHashes = Patterns.Select(p => p.GetHashCode()).ToList();
for (int i = 0; i < Patterns.Count; ++i)
{
var basePattern = Patterns[i];
for (int j = i + 1; j < Patterns.Count; ++j)
{
var patternToCheck = Patterns[j];
//If the patterns match, remove the second one.
if (patternHashes[i] == patternHashes[j] && basePattern.Equals(patternToCheck))
{
//Increment the frequency of the original pattern.
Patterns[i] = new Pattern(Patterns[i].Values, Patterns[i].Frequency + 1);
Patterns.RemoveAt(j);
patternHashes.RemoveAt(j);
j -= 1;
}
}
}
//Compute the color frequencies.
ColorFrequencies = new Dictionary <Color, uint>();
foreach (Pattern pattern in Patterns)
{
foreach (Vector2i patternPos in pattern.Values.AllIndices())
{
Color patternColor = pattern.Values.Get(patternPos);
if (!ColorFrequencies.ContainsKey(patternColor))
{
ColorFrequencies.Add(patternColor, 0);
}
ColorFrequencies[patternColor] += pattern.Frequency;
}
}
}
public override string ToString()
{
return("" + Values.SizeX() + "x" + Values.SizeY() + "|" + Frequency);
}
