StephaneLenclud@273: using System;
StephaneLenclud@273: using System.ComponentModel;
StephaneLenclud@273: using System.Drawing;
StephaneLenclud@273: using System.Drawing.Drawing2D;
StephaneLenclud@273: using System.Drawing.Text;
StephaneLenclud@273: using CSCore.DSP;
StephaneLenclud@273: 
StephaneLenclud@273: namespace Visualization
StephaneLenclud@273: {
StephaneLenclud@273:     public class LineSpectrum : SpectrumBase
StephaneLenclud@273:     {
StephaneLenclud@273:         private int _barCount;
StephaneLenclud@273:         private double _barSpacing;
StephaneLenclud@273:         private double _barWidth;
StephaneLenclud@273:         private Size _currentSize;
StephaneLenclud@273: 
StephaneLenclud@273:         public LineSpectrum(FftSize fftSize)
StephaneLenclud@273:         {
StephaneLenclud@273:             FftSize = fftSize;
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         [Browsable(false)]
StephaneLenclud@273:         public double BarWidth
StephaneLenclud@273:         {
StephaneLenclud@273:             get { return _barWidth; }
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         public double BarSpacing
StephaneLenclud@273:         {
StephaneLenclud@273:             get { return _barSpacing; }
StephaneLenclud@273:             set
StephaneLenclud@273:             {
StephaneLenclud@273:                 if (value < 0)
StephaneLenclud@273:                     throw new ArgumentOutOfRangeException("value");
StephaneLenclud@273:                 _barSpacing = value;
StephaneLenclud@273:                 UpdateFrequencyMapping();
StephaneLenclud@273: 
StephaneLenclud@273:                 RaisePropertyChanged("BarSpacing");
StephaneLenclud@273:                 RaisePropertyChanged("BarWidth");
StephaneLenclud@273:             }
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         public int BarCount
StephaneLenclud@273:         {
StephaneLenclud@273:             get { return _barCount; }
StephaneLenclud@273:             set
StephaneLenclud@273:             {
StephaneLenclud@273:                 if (value <= 0)
StephaneLenclud@273:                     throw new ArgumentOutOfRangeException("value");
StephaneLenclud@273:                 _barCount = value;
StephaneLenclud@273:                 SpectrumResolution = value;
StephaneLenclud@273:                 UpdateFrequencyMapping();
StephaneLenclud@273: 
StephaneLenclud@273:                 RaisePropertyChanged("BarCount");
StephaneLenclud@273:                 RaisePropertyChanged("BarWidth");
StephaneLenclud@273:             }
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         [BrowsableAttribute(false)]
StephaneLenclud@273:         public Size CurrentSize
StephaneLenclud@273:         {
StephaneLenclud@273:             get { return _currentSize; }
StephaneLenclud@273:             protected set
StephaneLenclud@273:             {
StephaneLenclud@273:                 _currentSize = value;
StephaneLenclud@273:                 RaisePropertyChanged("CurrentSize");
StephaneLenclud@273:             }
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         public Bitmap CreateSpectrumLine(Size size, Brush brush, Color background, bool highQuality)
StephaneLenclud@273:         {
StephaneLenclud@273:             if (!UpdateFrequencyMappingIfNessesary(size))
StephaneLenclud@273:                 return null;
StephaneLenclud@273: 
StephaneLenclud@273:             var fftBuffer = new float[(int)FftSize];
StephaneLenclud@273: 
StephaneLenclud@273:             //get the fft result from the spectrum provider
StephaneLenclud@273:             if (SpectrumProvider.GetFftData(fftBuffer, this))
StephaneLenclud@273:             {
StephaneLenclud@273:                 using (var pen = new Pen(brush, (float)_barWidth))
StephaneLenclud@273:                 {
StephaneLenclud@273:                     var bitmap = new Bitmap(size.Width, size.Height);
StephaneLenclud@273: 
StephaneLenclud@273:                     using (Graphics graphics = Graphics.FromImage(bitmap))
StephaneLenclud@273:                     {
StephaneLenclud@273:                         PrepareGraphics(graphics, highQuality);
StephaneLenclud@273:                         graphics.Clear(background);
StephaneLenclud@273: 
StephaneLenclud@273:                         CreateSpectrumLineInternal(graphics, pen, fftBuffer, size);
StephaneLenclud@273:                     }
StephaneLenclud@273: 
StephaneLenclud@273:                     return bitmap;
StephaneLenclud@273:                 }
StephaneLenclud@273:             }
StephaneLenclud@273:             return null;
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         public Bitmap CreateSpectrumLine(Size size, Color color1, Color color2, Color background, bool highQuality)
StephaneLenclud@273:         {
StephaneLenclud@273:             if (!UpdateFrequencyMappingIfNessesary(size))
StephaneLenclud@273:                 return null;
StephaneLenclud@273: 
StephaneLenclud@273:             using (
StephaneLenclud@273:                 Brush brush = new LinearGradientBrush(new RectangleF(0, 0, (float)_barWidth, size.Height), color2,
StephaneLenclud@273:                     color1, LinearGradientMode.Vertical))
StephaneLenclud@273:             {
StephaneLenclud@273:                 return CreateSpectrumLine(size, brush, background, highQuality);
StephaneLenclud@273:             }
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         private void CreateSpectrumLineInternal(Graphics graphics, Pen pen, float[] fftBuffer, Size size)
StephaneLenclud@273:         {
StephaneLenclud@273:             int height = size.Height;
StephaneLenclud@273:             //prepare the fft result for rendering 
StephaneLenclud@273:             SpectrumPointData[] spectrumPoints = CalculateSpectrumPoints(height, fftBuffer);
StephaneLenclud@273: 
StephaneLenclud@273:             //connect the calculated points with lines
StephaneLenclud@273:             for (int i = 0; i < spectrumPoints.Length; i++)
StephaneLenclud@273:             {
StephaneLenclud@273:                 SpectrumPointData p = spectrumPoints[i];
StephaneLenclud@273:                 int barIndex = p.SpectrumPointIndex;
StephaneLenclud@273:                 double xCoord = BarSpacing * (barIndex + 1) + (_barWidth * barIndex) + _barWidth / 2;
StephaneLenclud@273: 
StephaneLenclud@273:                 var p1 = new PointF((float)xCoord, height);
StephaneLenclud@273:                 var p2 = new PointF((float)xCoord, height - (float)p.Value - 1);
StephaneLenclud@273: 
StephaneLenclud@273:                 graphics.DrawLine(pen, p1, p2);
StephaneLenclud@273:             }
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         protected override void UpdateFrequencyMapping()
StephaneLenclud@273:         {
StephaneLenclud@273:             _barWidth = Math.Max(((_currentSize.Width - (BarSpacing * (BarCount + 1))) / BarCount), 0.00001);
StephaneLenclud@273:             base.UpdateFrequencyMapping();
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         private bool UpdateFrequencyMappingIfNessesary(Size newSize)
StephaneLenclud@273:         {
StephaneLenclud@273:             if (newSize != CurrentSize)
StephaneLenclud@273:             {
StephaneLenclud@273:                 CurrentSize = newSize;
StephaneLenclud@273:                 UpdateFrequencyMapping();
StephaneLenclud@273:             }
StephaneLenclud@273: 
StephaneLenclud@273:             return newSize.Width > 0 && newSize.Height > 0;
StephaneLenclud@273:         }
StephaneLenclud@273: 
StephaneLenclud@273:         private void PrepareGraphics(Graphics graphics, bool highQuality)
StephaneLenclud@273:         {
StephaneLenclud@273:             if (highQuality)
StephaneLenclud@273:             {
StephaneLenclud@273:                 graphics.SmoothingMode = SmoothingMode.AntiAlias;
StephaneLenclud@273:                 graphics.CompositingQuality = CompositingQuality.AssumeLinear;
StephaneLenclud@273:                 graphics.PixelOffsetMode = PixelOffsetMode.Default;
StephaneLenclud@273:                 graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
StephaneLenclud@273:             }
StephaneLenclud@273:             else
StephaneLenclud@273:             {
StephaneLenclud@273:                 graphics.SmoothingMode = SmoothingMode.HighSpeed;
StephaneLenclud@273:                 graphics.CompositingQuality = CompositingQuality.HighSpeed;
StephaneLenclud@273:                 graphics.PixelOffsetMode = PixelOffsetMode.None;
StephaneLenclud@273:                 graphics.TextRenderingHint = TextRenderingHint.SingleBitPerPixelGridFit;
StephaneLenclud@273:             }
StephaneLenclud@273:         }
StephaneLenclud@273:     }
StephaneLenclud@273: }