public void DrawFrequencyAxis()
{
freqTicks.Clear();
frequencyLabels.Clear();
float projectionHeight = this.Height - SpectrogramViewer.PADDING_BOTTOM;
double[] freqRange = parent.GetFrequencyRangeInView();
if (freqRange == null)
{
return;
}
double lowFreq = freqRange[1];
double highFreq = freqRange[0];
if (lowFreq == highFreq)
{
return;
}
double range = highFreq - lowFreq;
List <double> freqSamples = new List <double>();
double bandSize;
if (range < 10)
{
bandSize = 1;
}
else if (range < 25)
{
bandSize = 2;
}
else if (range < 80)
{
bandSize = 5;
}
else if (range < 160)
{
bandSize = 10;
}
else if (range < 325)
{
bandSize = 25;
}
else if (range < 750)
{
bandSize = 50;
}
else if (range < 1500)
{
bandSize = 100;
}
else if (range < 4000)
{
bandSize = 250;
}
else
{
bandSize = 500;
}
int numBands = (int)(range / bandSize);
double endRemainder = highFreq % bandSize;
double currentFreq = highFreq - endRemainder;
freqSamples.Add(currentFreq);
for (int i = 0; i < numBands; i++)
{
currentFreq -= bandSize;
freqSamples.Add(currentFreq);
}
for (int i = 0; i < freqSamples.Count; i++)
{
double freqPos = 1 - (double)(freqSamples[i] - lowFreq) / range;
Label freqLabel = new Label();
freqLabel.TextAlign = ContentAlignment.MiddleCenter;
freqLabel.Top = (int)(projectionHeight * freqPos) - freqLabel.Height / 2;
freqLabel.Left = -freqLabel.Width / 4;
freqLabel.Text = freqSamples[i].ToString("0.##") + " Hz";
freqLabel.Font = new Font(Form1.fonts.Families[0], 7.8F, FontStyle.Regular, GraphicsUnit.Point);
this.Controls.Add(freqLabel);
frequencyLabels.Add(freqLabel);
Rectangle primaryTick = new Rectangle(SpectrogramViewer.PADDING_LEFT - 2, freqLabel.Top + freqLabel.Height / 2, 2, 1);
if (freqTicks.Count > 0)
{
Rectangle secondaryTick = new Rectangle(SpectrogramViewer.PADDING_LEFT - 5, (freqTicks[i * 2 - 2].Y + primaryTick.Y) / 2, 5, 1);
freqTicks.Add(secondaryTick);
}
freqTicks.Add(primaryTick);
}
if (freqSamples.Count > 1)
{
if (freqSamples[0] - lowFreq >= (freqSamples[1] - freqSamples[0]) / 2)
{
Rectangle secondaryTick = new Rectangle(SpectrogramViewer.PADDING_LEFT - 5, freqTicks[0].Y - (freqTicks[1].Y - freqTicks[0].Y), 5, 1);
freqTicks.Add(secondaryTick);
}
if (highFreq - freqSamples[freqSamples.Count - 1] >= (freqSamples[freqSamples.Count - 1] - freqSamples[freqSamples.Count - 2]) / 2)
{
Rectangle secondaryTick = new Rectangle(SpectrogramViewer.PADDING_LEFT - 5, freqTicks[freqTicks.Count - 1].Y + (freqTicks[1].Y - freqTicks[0].Y), 5, 1);
freqTicks.Add(secondaryTick);
}
}
if (parent.MySpectrogramHandler.Spectrogram.FrequencyScale.GetType().Name == "Func`2")
{
foreach (Label freqLabel in frequencyLabels)
{
float labelPos = (projectionHeight - freqLabel.Top + freqLabel.Height / 2) / projectionHeight;
double newFreq = parent.GetFrequencyPoint(labelPos);
freqLabel.Text = newFreq.ToString("0") + " Hz";
}
}
}
