private Bitmap GetCachedHistogram(Histmode mode, Channel channel)
{
Bitmap res = null;
if (cachedHistograms[mode].Keys.Contains(channel))
{
res = cachedHistograms[mode][channel];
}
return(res);
}
public Bitmap GetHistogram(Channel channel, Color color, Histmode mode)
{
Bitmap cached = GetCachedHistogram(mode, channel);
if (cached == null)
{
cached = historgamCreators[channel].getHist(color, mode);
SetCashedHistogram(mode, channel, cached);
}
return(cached);
}
public Bitmap getHist(Color clr, Histmode mode)
{
Bitmap res = new Bitmap(BITMAP_WIDTH, BITMAP_HEIGHT);
var data = getScaled(mode);
using (Graphics g = Graphics.FromImage(res))
{
Pen p = new Pen(clr);
for (int i = 0; i < data.Length; i++)
{
Point x = new Point(i, BITMAP_HEIGHT);
Point y = new Point(i, BITMAP_HEIGHT - data[i]);
g.DrawLine(p, x, y);
Console.WriteLine("Ok: i = {0}, x = {1}, y = {2}", i, x, y);
}
}
return(res);
}
private int[] getScaled(Histmode mode)
{
int[] res = new int[256];
histdata.CopyTo(res, 0);
var max_c = res.Max();
double k = BITMAP_HEIGHT;
if (mode == Histmode.Lin)
{
k /= max_c;
}
else if (mode == Histmode.Log)
{
k /= Math.Log(max_c);
}
for (int i = 0; i < res.Length; i++)
{
if (res[i] == 0)
{
continue;
}
if (mode == Histmode.Lin)
{
res[i] = (int)Math.Round(res[i] * k);
}
else if (mode == Histmode.Log)
{
res[i] = (int)Math.Round(Math.Log(res[i]) * k);
}
}
return(res);
}
private void SetCashedHistogram(Histmode mode, Channel channel, Bitmap histogram)
{
cachedHistograms[mode].Add(channel, histogram);
}
