public unsafe void Render(float *powerSpectrum, int length)
{
if (_scaledPowerSpectrum == null || _scaledPowerSpectrum.Length != length)
{
_scaledPowerSpectrum = new byte[length];
}
fixed(byte *scaledPowerSpectrumPtr = _scaledPowerSpectrum)
{
var displayOffset = _displayOffset / 10 * 10;
var displayRange = _displayRange / 10 * 10;
Fourier.ScaleFFT(powerSpectrum, scaledPowerSpectrumPtr, length, displayOffset - displayRange, displayOffset);
}
var scaledLength = (int)(length / _scale);
var offset = (int)((length - scaledLength) / 2.0 + length * (double)(_displayCenterFrequency - _centerFrequency) / _spectrumWidth);
if (_useSmoothing)
{
Fourier.SmoothCopy(_scaledPowerSpectrum, _temp, length, _scale, offset);
for (var i = 0; i < _powerSpectrum.Length; i++)
{
var ratio = _powerSpectrum[i] < _temp[i] ? Attack : Decay;
_powerSpectrum[i] = (byte)Math.Round(_powerSpectrum[i] * (1 - ratio) + _temp[i] * ratio);
}
}
else
{
Fourier.SmoothCopy(_scaledPowerSpectrum, _powerSpectrum, length, _scale, offset);
}
Draw();
InvalidateVisual();
}
protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo)
{
base.OnRenderSizeChanged(sizeInfo);
Rectangle ClientRectangle = new Rectangle(0, 0, (int)RenderSize.Width, (int)RenderSize.Height);
if (ClientRectangle.Width == 0 || ClientRectangle.Height == 0)
{
return;
}
if (_initialized)
{
_buffer.Dispose();
_graphics.Dispose();
_bkgBuffer.Dispose();
_gradientBrush.Dispose();
}
else
{
ApplyZoom();
}
_buffer = new Bitmap(ClientRectangle.Width, ClientRectangle.Height, PixelFormat.Format32bppPArgb);
_graphics = Graphics.FromImage(_buffer);
ConfigureGraphics(_graphics);
_bkgBuffer = new Bitmap(ClientRectangle.Width, ClientRectangle.Height, PixelFormat.Format32bppPArgb);
var length = ClientRectangle.Width - 2 * AxisMargin;
var oldSpectrum = _spectrum;
_maxSpectrum = new byte[length];
_spectrum = new byte[length];
_peaks = new bool[length];
if (oldSpectrum != null)
{
Fourier.SmoothCopy(oldSpectrum, _spectrum, oldSpectrum.Length, 1, 0);
}
else
{
for (var i = 0; i < _spectrum.Length; i++)
{
_spectrum[i] = 0;
}
}
_temp = new byte[length];
_points = new System.Drawing.Point[length + 2];
if (_spectrumWidth > 0)
{
_xIncrement = _scale * (ClientRectangle.Width - 2 * AxisMargin) / _spectrumWidth;
}
_gradientBrush = new LinearGradientBrush(new Rectangle(AxisMargin, AxisMargin, ClientRectangle.Width - AxisMargin, ClientRectangle.Height - AxisMargin), Color.White, Color.Black, LinearGradientMode.Vertical);
_gradientBrush.InterpolationColors = _gradientColorBlend;
_writeableBitmap = new WriteableBitmap(ClientRectangle.Width, ClientRectangle.Height, _buffer.HorizontalResolution, _buffer.VerticalResolution, System.Windows.Media.PixelFormats.Bgr32, null);
_initialized = true;
_drawBackgroundNeeded = true;
Perform();
}
protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo)
{
base.OnRenderSizeChanged(sizeInfo);
Rectangle ClientRectangle = new Rectangle(0, 0, (int)RenderSize.Width, (int)RenderSize.Height);
if (ClientRectangle.Width <= AxisMargin || ClientRectangle.Height <= AxisMargin)
{
return;
}
if (!_initialized)
{
_powerSpectrum = new byte[ClientRectangle.Width - 2 * AxisMargin];
_temp = new byte[_powerSpectrum.Length];
_buffer = new Bitmap(ClientRectangle.Width, ClientRectangle.Height, PixelFormat.Format32bppPArgb);
_buffer2 = new Bitmap(ClientRectangle.Width, ClientRectangle.Height, PixelFormat.Format32bppPArgb);
_graphics = Graphics.FromImage(_buffer);
_graphics2 = Graphics.FromImage(_buffer2);
_gradientBrush = new LinearGradientBrush(new Rectangle(AxisMargin / 2, AxisMargin / 2, ClientRectangle.Width - AxisMargin / 2, ClientRectangle.Height - AxisMargin / 2), Color.White, Color.Black, LinearGradientMode.Vertical);
_gradientBrush.InterpolationColors = _gradientColorBlend;
_writeableBitmap = new WriteableBitmap(ClientRectangle.Width, ClientRectangle.Height, _buffer.HorizontalResolution, _buffer.VerticalResolution, System.Windows.Media.PixelFormats.Bgr32, null);
_initialized = true;
ApplyZoom();
}
else
{
var temp = new byte[ClientRectangle.Width - 2 * AxisMargin];
Fourier.SmoothCopy(_powerSpectrum, temp, _powerSpectrum.Length, (_temp.Length + temp.Length) / (float)_temp.Length, 0);
_powerSpectrum = temp;
_temp = new byte[_powerSpectrum.Length];
var oldBuffer = _buffer;
_buffer = new Bitmap(ClientRectangle.Width, ClientRectangle.Height, PixelFormat.Format32bppPArgb);
var oldBuffer2 = _buffer2;
_buffer2 = new Bitmap(ClientRectangle.Width, ClientRectangle.Height, PixelFormat.Format32bppPArgb);
_writeableBitmap = new WriteableBitmap(ClientRectangle.Width, ClientRectangle.Height, _buffer.HorizontalResolution, _buffer.VerticalResolution, System.Windows.Media.PixelFormats.Bgr32, null);
_graphics.Dispose();
_graphics = Graphics.FromImage(_buffer);
ConfigureGraphics(_graphics);
_graphics2.Dispose();
_graphics2 = Graphics.FromImage(_buffer2);
ConfigureGraphics(_graphics2);
_graphics.Clear(Color.Black);
var rect = new Rectangle(AxisMargin, 0, _buffer.Width - 2 * AxisMargin, _buffer.Height);
_graphics.DrawImage(oldBuffer, rect, AxisMargin, 0, oldBuffer.Width - 2 * AxisMargin, oldBuffer.Height, GraphicsUnit.Pixel);
oldBuffer.Dispose();
oldBuffer2.Dispose();
if (_spectrumWidth > 0)
{
_xIncrement = _scale * (ClientRectangle.Width - 2 * AxisMargin) / _spectrumWidth;
}
_gradientBrush.Dispose();
_gradientBrush = new LinearGradientBrush(new Rectangle(AxisMargin / 2, AxisMargin / 2, ClientRectangle.Width - AxisMargin / 2, ClientRectangle.Height - AxisMargin / 2), Color.White, Color.Black, LinearGradientMode.Vertical);
_gradientPixels = null;
_gradientBrush.InterpolationColors = _gradientColorBlend;
}
GC.Collect();
DrawGradient();
BuildGradientVector();
_performNeeded = true;
var oldMouseIn = _mouseIn;
_mouseIn = true;
Perform();
_mouseIn = oldMouseIn;
}