protected override void OnPaint(PaintEventArgs e)
{
if (this.Audio != null)
{
long position = 0;
if (audio.Format == Enums.AudioFormats.MP3)
{
MP3File file = audio as MP3File;
position = file.Reader.Position / 2;
}
else if (audio.Format == Enums.AudioFormats.WAV)
{
WaveFile file = audio as WaveFile;
position = file.Reader.Position / 2;
}
double[] spectrum = SpectrumViewer.getSpectrum(this.Audio, position);
if (this.state == ViewState.LOGARITHM)
{
this.logarithmSpectrum(spectrum);
}
e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
Pen linePen = new Pen(this.PenColor, this.PenWidth);
linePen.StartCap = System.Drawing.Drawing2D.LineCap.Round;
linePen.EndCap = System.Drawing.Drawing2D.LineCap.Round;
float step = (float)(this.Width - 20) / spectrum.Length;
// Отрисовка шкалы по оси X
int yLinePos = (this.state != ViewState.LOGARITHM) ? this.Height - 20 : 20;
int yStringPos = (this.state != ViewState.LOGARITHM) ? yLinePos + 3 : 3;
e.Graphics.DrawLine(Pens.White, 0, yLinePos, this.Width, yLinePos);
e.Graphics.DrawString("kHz", new Font(FontFamily.GenericSansSerif, 7.5f), Brushes.White, 0, yStringPos);
int[] freqPointsPercents = { 5, 10, 20, 25, 40, 50, 60, 75, 80, 90, 95 }; // Позиции значений частот (в %)
float freqPoint;
for (int i = 0; i < freqPointsPercents.Length; i++)
{
freqPoint = 20 + (freqPointsPercents[i] * (this.Width - 20) / 100f);
if (this.state == ViewState.COLUMNAR || this.state == ViewState.DEFAULT)
{
e.Graphics.DrawLine(new Pen(Color.Gray, 1f), freqPoint, 0, freqPoint, this.Height - 20);
}
else
{
e.Graphics.DrawLine(new Pen(Color.Gray, 1f), freqPoint, 20, freqPoint, this.Height);
}
// Получение частоты в текущей точке и ее отображение
double sample = (spectrum.Length * freqPointsPercents[i]) / 100.0;
string currentFreq = ((sample * freq) * Math.Pow(10, -3)).ToString("0.000");
e.Graphics.DrawString(currentFreq, new Font(FontFamily.GenericSansSerif, 7.5f), Brushes.White, freqPoint - 15, yStringPos);
}
// Отрисовка шкалы по оси Y
e.Graphics.DrawLine(Pens.White, 20, 0, 20, this.Height);
if (this.state == ViewState.LOGARITHM)
{
e.Graphics.DrawString("dB", new Font(FontFamily.GenericSansSerif, 7.5f), Brushes.White, 2, this.Height - 15);
}
int[] gradePointsPercents = { 10, 20, 30, 40, 50, 60, 70, 80, 90 }; // Позиции значений уровня спектра (в %)
int gradePoint;
double currentGrade;
for (int i = 0; i < gradePointsPercents.Length; i++)
{
if (i == gradePointsPercents.Length - 1 && this.state == ViewState.LOGARITHM)
{
break; // Для dB не выводить последнее значение
}
gradePoint = gradePointsPercents[i] * (this.Height - 20) / 100;
gradePoint = (this.state == ViewState.LOGARITHM) ? gradePoint + 20 : gradePoint;
e.Graphics.DrawLine(new Pen(Color.Gray, 1f), 20, gradePoint, this.Width, gradePoint);
if (this.state != ViewState.LOGARITHM)
{
// Нормировка значения уровня спектра
currentGrade = (this.Height - 20 - gradePoint) * this.Audio.Avg / (this.Height - 20);
if (this.state == ViewState.COLUMNAR)
{
currentGrade /= 3;
}
currentGrade *= 10000;
currentGrade = Math.Round(currentGrade);
}
else
{
currentGrade = Math.Round(gradePoint / -1.5);
}
e.Graphics.DrawString(currentGrade.ToString(), new Font(FontFamily.GenericSansSerif, 7f), Brushes.White, -1, gradePoint - 6);
}
// Отрисовка спектра
float koef = (this.state != ViewState.LOGARITHM) ? (this.Height - 20) / this.Audio.Avg : 1.5f;
float x = e.ClipRectangle.X + 20;
float y = (float)(this.Height - 20);
y = (this.state == ViewState.LOGARITHM) ? 20 : y;
if (this.state != ViewState.COLUMNAR) // Для грфаического представления
{
float x1, y1;
for (int i = 1; i < spectrum.Length; i++)
{
x1 = x + step;
y1 = (this.state != ViewState.LOGARITHM) ? (this.Height - 20) - (float)(spectrum[i] * koef) : 20 - (float)(spectrum[i] * koef);
if (float.IsInfinity(y1))
{
continue;
}
e.Graphics.DrawLine(linePen, x, y, x1, y1);
x = x1; y = y1;
}
}
else // Для столбчатого
{
float columnWidth = (float)(this.Width - 20) / this.columnCount;
float columnHeight = 0;
float columnHeightCoord;
float oldLineYCoord;
for (int i = 0; i < this.columnCount; i++, columnHeight = 0)
{
// Находим среднее значение уровня для текущего столбца
for (int j = i * (spectrum.Length / this.columnCount), count = 0; count < (spectrum.Length / this.columnCount); j++, count++)
{
if (i == 0 && j == 0)
{
continue;
}
columnHeight += (float)spectrum[j];
}
columnHeight /= (i == 0) ? (spectrum.Length / this.columnCount) - 1 : spectrum.Length / this.columnCount;
this.oldValues[i] -= 0.00005f; // Плавное падение полосы-указателя предыдущего уровня
oldLineYCoord = (this.Height - 20) - this.oldValues[i] * koef * 3;
if (columnHeight > this.oldValues[i])
{
this.oldValues[i] = columnHeight; // Обновление указателя уровня
}
columnHeightCoord = (this.Height - 20) - columnHeight * koef * 3;
e.Graphics.DrawLine(linePen, x, oldLineYCoord, x + columnWidth, oldLineYCoord);
e.Graphics.DrawRectangle(Pens.Aqua, x, columnHeightCoord, columnWidth, y - columnHeightCoord);
x += columnWidth;
}
}
}
base.OnPaint(e);
}