private static Image Render(string selectedFile, IPeakProvider peakProvider, WaveRendererSettings settings)
{
using (var reader = new AudioFileReader(selectedFile))
{
settings.Width = settings.Width ?? (int)reader.TotalTime.TotalMilliseconds / 2;
int bytesPerSample = (reader.WaveFormat.BitsPerSample / 8);
var samples = reader.Length / (bytesPerSample);
var samplesPerPixel = (int)(samples / settings.Width);
var stepSize = settings.PixelsPerPeak + settings.SpacerPixels;
peakProvider.Init(reader, samplesPerPixel * stepSize);
return(Render(peakProvider, settings));
}
}
private static Image Render(IPeakProvider peakProvider, WaveRendererSettings settings)
{
if (settings.DecibelScale)
{
peakProvider = new DecibelPeakProvider(peakProvider, 48);
}
var b = new Bitmap(settings.Width.Value, settings.TopHeight + settings.BottomHeight);
if (settings.BackgroundColor == Color.Transparent)
{
b.MakeTransparent();
}
using (var g = Graphics.FromImage(b))
{
g.FillRectangle(settings.BackgroundBrush, 0, 0, b.Width, b.Height);
var midPoint = settings.TopHeight;
int x = 0;
var currentPeak = peakProvider.GetNextPeak();
while (x < settings.Width)
{
var nextPeak = peakProvider.GetNextPeak();
for (int n = 0; n < settings.PixelsPerPeak; n++)
{
var lineHeight = settings.TopHeight * currentPeak.Max;
g.DrawLine(settings.TopPeakPen, x, midPoint, x, midPoint - lineHeight);
lineHeight = settings.BottomHeight * currentPeak.Min;
g.DrawLine(settings.BottomPeakPen, x, midPoint, x, midPoint - lineHeight);
x++;
}
for (int n = 0; n < settings.SpacerPixels; n++)
{
// spacer bars are always the lower of the
var max = Math.Min(currentPeak.Max, nextPeak.Max);
var min = Math.Max(currentPeak.Min, nextPeak.Min);
var lineHeight = settings.TopHeight * max;
g.DrawLine(settings.TopSpacerPen, x, midPoint, x, midPoint - lineHeight);
lineHeight = settings.BottomHeight * min;
g.DrawLine(settings.BottomSpacerPen, x, midPoint, x, midPoint - lineHeight);
x++;
}
currentPeak = nextPeak;
}
}
return(b);
}