private double GetDifferenceForTarget(MosaicTileColour tileColor, int i, Target target)
{
if (target == Target.Whole)
{
return(GetLibraryTileDifference(tileColor, i));
}
else
{
switch (target)
{
case Target.TL:
return(tileColor.AverageWhole.GetDifference(library[i].AverageTL));
case Target.TR:
return(tileColor.AverageWhole.GetDifference(library[i].AverageTR));
case Target.BL:
return(tileColor.AverageWhole.GetDifference(library[i].AverageBL));
case Target.BR:
return(tileColor.AverageWhole.GetDifference(library[i].AverageBR));
default:
return(GetLibraryTileDifference(tileColor, i));
}
}
}
public MosaicTileColour[,] CreateMap(Bitmap img)
{
int horizontalTiles = (int)img.Width / tileSize.Width;
int verticalTiles = (int)img.Height / tileSize.Height;
var colorMap = new MosaicTileColour[horizontalTiles, verticalTiles];
int tileWidth = (img.Width - img.Width % horizontalTiles) / horizontalTiles;
int tileHeight = (img.Height - img.Height % verticalTiles) / verticalTiles;
// Explore option of making this a parallel for loop
for (int x = 0; x < horizontalTiles; x++)
{
for (int y = 0; y < verticalTiles; y++)
{
var xstart = tileWidth * x;
var ystart = tileHeight * y;
var tileColour = new MosaicTileColour();
// These are the opertaions to perform if we want to subdivide tile
tileColour.AverageTL = getAverageTileColor(CreateQuadrantRectangle(xstart, ystart, tileWidth, tileHeight, Target.TL), img, quality);
tileColour.AverageTR = getAverageTileColor(CreateQuadrantRectangle(xstart, ystart, tileWidth, tileHeight, Target.TR), img, quality);
tileColour.AverageBL = getAverageTileColor(CreateQuadrantRectangle(xstart, ystart, tileWidth, tileHeight, Target.BL), img, quality);
tileColour.AverageBR = getAverageTileColor(CreateQuadrantRectangle(xstart, ystart, tileWidth, tileHeight, Target.BR), img, quality);
tileColour.AverageWhole = getAverageTileColor(CreateQuadrantRectangle(xstart, ystart, tileWidth, tileHeight, Target.Whole), img, quality);
colorMap[x, y] = tileColour;
}
}
return(colorMap);
}
private double GetLibraryTileDifference(MosaicTileColour color, int i)
{
var differenceTL = color.AverageTL.GetDifference(library[i].AverageTL);
var differenceTR = color.AverageTR.GetDifference(library[i].AverageTR);
var differenceBL = color.AverageBL.GetDifference(library[i].AverageBL);
var differenceBR = color.AverageBR.GetDifference(library[i].AverageBR);
return(differenceTL + differenceTR + differenceBL + differenceBR);
}
// Passes the colour value for the current tile being analysed
// Uses library which contains the average colour for all of the tile images
private int GetBestImageIndex(MosaicTileColour tileColor, int x, int y, bool random, Target target)
{
double bestPercent = double.MaxValue;
var bestIndexes = new Dictionary <int, double>();
bestIndexes.Add(-1, bestPercent);
const byte offset = 7;
double difference;
for (int i = 0; i < library.Count(); i++)
{
difference = GetDifferenceForTarget(tileColor, i, target);
// as well as best diff store the 10th best diff and replace that item when necessary
if (difference < bestPercent)
{
Point point = new Point();
if (library[i].Data.Count > 0 && library[i].Data[0] != null)
{
point = (Point)library[i].Data[0];
}
if (point.IsEmpty)
{
bestIndexes.Add(i, difference);
}
else if (point.X + offset <= x && point.Y + offset > y && point.Y - offset < y)
{
bestIndexes.Add(i, difference);
}
// if length of dictionary is > 10 remove the largest value entry
if (bestIndexes.Count() > 10)
{
var maxValue = bestIndexes.Values.Max();
var maxKey = bestIndexes.FirstOrDefault(v => v.Value == maxValue).Key;
bestIndexes.Remove(maxKey);
}
// update best percent to largest value in dictionary
bestPercent = bestIndexes.Values.Max();
}
}
// Will remove the inital entry if still present
if (bestIndexes.ContainsKey(-1))
{
bestIndexes.Remove(-1);
}
int index;
if (random)
{
// Randomly select one of the best fit indexes
index = bestIndexes.ElementAt(new Random().Next(0, bestIndexes.Count - 1)).Key;
}
else
{
var min = bestIndexes.Values.Min();
index = bestIndexes.FirstOrDefault(v => v.Value == min).Key;
}
library[index].Data.Add(new Point(x, y));
library[index].Difference = bestIndexes.GetValueOrDefault(index);
return(index);
}
