public static Color GetColorGradient(float value, bool selected, bool grayscale)
{
if (!AColor.gradient_inited)
{
AColor.PreComputeGradient();
}
int idx = (int)(value * (AColor.gradientSteps - 1));
// TODO: select
return(Color.Aquamarine);
}
public static Color GetColorGradient(float percentage)
{
if (!AColor.gradient_inited)
{
AColor.PreComputeGradient2();
}
float i = percentage * (AColor.gradientSteps - 1);
int idx = (int)i;
Color c = Color.White;
try {
c = gradient_preloaded[idx];
} catch (Exception e) {
System.Diagnostics.Debug.WriteLine("Error looking up color id: " + idx);
System.Diagnostics.Debug.WriteLine(e);
}
return(c);
}
public void drawSpectrogram4(String prefix, String filename, float[][] data)
{
float amplitude;
double numberOfSamplesX = data.Length;
double numberOfSamplesY = data[0].Length;
// set width and height
int width = (int)numberOfSamplesX;
int height = (int)numberOfSamplesY;
String filenameToSave = String.Format("C:\\{0}-{1}x{2}-{3}.png", prefix, width, height, System.IO.Path.GetFileNameWithoutExtension(filename));
System.Console.Out.WriteLine("Writing " + filenameToSave);
double horizontalScaleFactor = (double)width / numberOfSamplesX;
double verticalScaleFactor = (double)height / numberOfSamplesY;
// Now, you need to figure out the incremental jump between samples to adjust for the scale factor. This works out to be:
int incrementX = (int)(numberOfSamplesX / (numberOfSamplesX * horizontalScaleFactor));
if (incrementX == 0)
{
incrementX = 1;
}
int incrementY = (int)(numberOfSamplesY / (numberOfSamplesY * verticalScaleFactor));
if (incrementY == 0)
{
incrementY = 1;
}
Bitmap png = new Bitmap(width, height, PixelFormat.Format32bppArgb);
Graphics g = Graphics.FromImage(png);
Rectangle rect = new Rectangle(0, 0, width, height);
g.FillRectangle(Brushes.White, rect);
int x = 0;
int y = 0;
for (x = 0; x < numberOfSamplesX; x += incrementX)
{
for (y = 0; y < numberOfSamplesY; y += incrementY)
{
int xCoord = (int)MathUtils.RoundDown(x * horizontalScaleFactor, 0);
int yCoord = (int)MathUtils.RoundDown(y * verticalScaleFactor, 0);
amplitude = data[x][y];
// Convert float to dB
float MinDb = -60.0f;
float MaxDb = 0.0f;
float db = 20 * (float)Math.Log10((float)amplitude);
if (db < MinDb)
{
db = MinDb;
}
if (db > MaxDb)
{
db = MaxDb;
}
float percentage = (db - MinDb) / (MaxDb - MinDb);
Color c = AColor.GetColorGradient(percentage);
png.SetPixel(xCoord, yCoord, c);
}
}
png.Save(filenameToSave);
g.Dispose();
}
