public void BuildHistogramImage()
{
if (!isLoaded)
{
return;
}
if (ActualHeight == 0 || ActualWidth == 0)
{
return;
}
RawBitmap bmp = new RawBitmap((int)ActualWidth, (int)ActualHeight);
if (ctk != null)
{
ctk.Cancel();
}
ctk = new CancellationTokenSource();
Task.Run(() =>
{
if (histograph != null && maxValue != null)
{
if (mode == LevelMode.RGB)
{
for (int g = 0; g < 3; g++)
{
if (maxValue[g] != 0)
{
//gather initial points
List <Vector2> points = new List <Vector2>();
for (int x = 0; x < 256; x++)
{
int t = histograph[g, x];
float w = (float)x / 255.0f;
int ax = (int)Math.Floor(w * ActualWidth);
float p = (float)t / (float)maxValue[g];
int may = (int)Math.Min((int)ActualHeight, Math.Floor(p * (int)ActualHeight));
points.Add(new Vector2(ax, may));
}
List <Vector2> spline = CatmullRomSpline.GetSpline(points, 8);
Parallel.For(0, spline.Count, i =>
{
Vector2 p = spline[i];
for (int k = 0; k < p.Y; k++)
{
bmp.SetPixel((int)p.X, bmp.Height - 1 - k, 175, 175, 175, 255);
}
});
}
}
}
else
{
int g = (int)mode;
if (maxValue[g] != 0)
{
List <Vector2> points = new List <Vector2>();
//gather initial points
for (int x = 0; x < 256; x++)
{
int t = histograph[g, x];
float w = (float)x / 255.0f;
int ax = (int)Math.Floor(w * ActualWidth);
float p = (float)t / (float)maxValue[g];
int may = (int)Math.Min(ActualHeight, Math.Floor(p * ActualHeight));
points.Add(new Vector2(ax, may));
}
List <Vector2> spline = CatmullRomSpline.GetSpline(points, 8);
Parallel.For(0, spline.Count, i =>
{
Vector2 p = spline[i];
for (int k = 0; k < p.Y; k++)
{
bmp.SetPixel((int)p.X, bmp.Height - 1 - k, 175, 175, 175, 255);
}
});
}
}
}
}, ctk.Token).ContinueWith(t =>
{
if (t.IsCanceled)
{
return;
}
if (bmp == null)
{
return;
}
Application.Current.Dispatcher.Invoke(() =>
{
PreviewView.Source = bmp.ToImageSource();
});
});
}