///
/// <summary> * Draw a linear spectrum graph.
/// * </summary>
/// * <param name="data"> An array of floats defining the signal power
/// * at each frequency in the spectrum. </param>
/// * <param name="graphics"> Canvas to draw into. </param>
/// * <param name="pen"> Graphics to draw with. </param>
///
private void logGraph(float[] data, Graphics graphics, Pen pen)
{
//pen.Style = Graphics.Style.FILL;
paintColor[1] = 1f;
paintColor[2] = 1f;
int len = data.Length;
float bw = (float)(spectGraphWidth - 2) / (float)len;
float bh = spectGraphHeight - 2;
float be = spectGraphY + spectGraphHeight - 1;
// Determine the first and last frequencies we have.
float leftFrequency = nyquistFreq / len;
float rightFrequency = nyquistFreq;
// Now, how many octaves is that. Round down. Calculate pixels/oct.
int octaves = (int)Math.Floor(log2(rightFrequency / leftFrequency)) - 2;
float octWidth = (float)(spectGraphWidth - 2) / (float)octaves;
// Calculate the base frequency for the graph, which isn't leftFrequency.
float baseFrequency = rightFrequency / (float)Math.Pow(2, octaves);
// TODO: Old Java: Element 0 isn't a frequency bucket; skip it.
for (int i = 1; i < len; ++i)
{
// Cycle the hue angle from 0° to 300°; i.e. red to purple.
paintColor[0] = (float)i / (float)len * 300f;
pen.Color = AColor.HSVToColor(paintColor);
// What frequency bucket are we in.
float f = leftFrequency * i;
// For freq f, calculate x.
float x = spectGraphX + (float)(log2(f) - log2(baseFrequency)) * octWidth;
// Draw the bar.
float y = be - (float)(Math.Log10(data[i]) / RANGE_BELS + 1f) * bh;
if (y > be)
{
y = be;
}
else if (y < spectGraphY)
{
y = spectGraphY;
}
if (bw <= 1.0f)
{
graphics.DrawLine(pen, x, y, x, be);
}
else
{
//graphics.DrawRectangle(pen, x, y, bw, be-y);
graphics.FillRectangle(new SolidBrush(pen.Color), x, y, bw, be - y);
}
}
}
///
/// <summary> * Draw a linear spectrum graph.
/// * </summary>
/// * <param name="data"> An array of floats defining the signal power
/// * at each frequency in the spectrum. </param>
/// * <param name="graphics"> Canvas to draw into. </param>
/// * <param name="pen"> Graphics to draw with. </param>
///
private void linearGraph(float[] data, Graphics graphics, Pen pen)
{
paintColor[1] = 1f;
paintColor[2] = 1f;
int len = data.Length;
float bw = (float)(spectGraphWidth - 2) / (float)len;
float bh = spectGraphHeight - 2;
float be = spectGraphY + spectGraphHeight - 1;
// TODO: Java: Element 0 isn't a frequency bucket; skip it.
for (int i = 1; i < len; ++i)
{
// Cycle the hue angle from 0° to 300°; i.e. red to purple.
paintColor[0] = (float)i / (float)len * 300f;
pen.Color = AColor.HSVToColor(paintColor);
// Draw the bar.
float x = spectGraphX + (i * bw + 1); // + (i * bw + 1)
float y = be - (float)(Math.Log10(data[i]) / RANGE_BELS + 1f) * bh;
if (y > be)
{
y = be;
}
else if (y < spectGraphY)
{
y = spectGraphY;
}
if (bw <= 1.0f)
{
graphics.DrawLine(pen, x, y, x, be);
}
else
{
// canvas.drawRect(x, y, x + bw, be, paint);
// graphics.DrawRectangle(pen, x, y, bw, be-y);
graphics.FillRectangle(new SolidBrush(pen.Color), x, y, bw, be - y);
}
}
}