using System;

 using System.ComponentModel;

 using System.Drawing;

 using System.Drawing.Drawing2D;

 using System.Drawing.Text;

 using CSCore.DSP;

 namespace Visualization

 {

     public class LineSpectrum : SpectrumBase

     {

         private int _barCount;

         private double _barSpacing;

         private double _barWidth;

         private Size _currentSize;

         public LineSpectrum(FftSize fftSize)

         {

             FftSize = fftSize;

         }

         [Browsable(false)]

         public double BarWidth

         {

             get { return _barWidth; }

         }

         public double BarSpacing

         {

             get { return _barSpacing; }

             set

             {

                 if (value < 0)

                     throw new ArgumentOutOfRangeException("value");

                 _barSpacing = value;

                 UpdateFrequencyMapping();

                 RaisePropertyChanged("BarSpacing");

                 RaisePropertyChanged("BarWidth");

             }

         }

         public int BarCount

         {

             get { return _barCount; }

             set

             {

                 if (value <= 0)

                     throw new ArgumentOutOfRangeException("value");

                 _barCount = value;

                 SpectrumResolution = value;

                 UpdateFrequencyMapping();

                 RaisePropertyChanged("BarCount");

                 RaisePropertyChanged("BarWidth");

             }

         }

         [BrowsableAttribute(false)]

         public Size CurrentSize

         {

             get { return _currentSize; }

             protected set

             {

                 _currentSize = value;

                 RaisePropertyChanged("CurrentSize");

             }

         }

         public Bitmap CreateSpectrumLine(Size size, Brush brush, Color background, bool highQuality)

         {

             if (!UpdateFrequencyMappingIfNessesary(size))

                 return null;

             var fftBuffer = new float[(int)FftSize];

             //get the fft result from the spectrum provider

             if (SpectrumProvider.GetFftData(fftBuffer, this))

             {

                 using (var pen = new Pen(brush, (float)_barWidth))

                 {

                     var bitmap = new Bitmap(size.Width, size.Height);

                     using (Graphics graphics = Graphics.FromImage(bitmap))

                     {

                         PrepareGraphics(graphics, highQuality);

                         graphics.Clear(background);

                         CreateSpectrumLineInternal(graphics, pen, fftBuffer, size);

                     }

                     return bitmap;

                 }

             }

             return null;

         }

         public Bitmap CreateSpectrumLine(Size size, Color color1, Color color2, Color background, bool highQuality)

         {

             if (!UpdateFrequencyMappingIfNessesary(size))

                 return null;

             using (

                 Brush brush = new LinearGradientBrush(new RectangleF(0, 0, (float)_barWidth, size.Height), color2,

                     color1, LinearGradientMode.Vertical))

             {

                 return CreateSpectrumLine(size, brush, background, highQuality);

             }

         }

         private void CreateSpectrumLineInternal(Graphics graphics, Pen pen, float[] fftBuffer, Size size)

         {

             int height = size.Height;

             //prepare the fft result for rendering 

             SpectrumPointData[] spectrumPoints = CalculateSpectrumPoints(height, fftBuffer);

             //connect the calculated points with lines

             for (int i = 0; i < spectrumPoints.Length; i++)

             {

                 SpectrumPointData p = spectrumPoints[i];

                 int barIndex = p.SpectrumPointIndex;

                 double xCoord = BarSpacing * (barIndex + 1) + (_barWidth * barIndex) + _barWidth / 2;

                 var p1 = new PointF((float)xCoord, height);

                 var p2 = new PointF((float)xCoord, height - (float)p.Value - 1);

                 graphics.DrawLine(pen, p1, p2);

             }

         }

         protected override void UpdateFrequencyMapping()

         {

             _barWidth = Math.Max(((_currentSize.Width - (BarSpacing * (BarCount + 1))) / BarCount), 0.00001);

             base.UpdateFrequencyMapping();

         }

         private bool UpdateFrequencyMappingIfNessesary(Size newSize)

         {

             if (newSize != CurrentSize)

             {

                 CurrentSize = newSize;

                 UpdateFrequencyMapping();

             }

             return newSize.Width > 0 && newSize.Height > 0;

         }

         private void PrepareGraphics(Graphics graphics, bool highQuality)

         {

             if (highQuality)

             {

                 graphics.SmoothingMode = SmoothingMode.AntiAlias;

                 graphics.CompositingQuality = CompositingQuality.AssumeLinear;

                 graphics.PixelOffsetMode = PixelOffsetMode.Default;

                 graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;

             }

             else

             {

                 graphics.SmoothingMode = SmoothingMode.HighSpeed;

                 graphics.CompositingQuality = CompositingQuality.HighSpeed;

                 graphics.PixelOffsetMode = PixelOffsetMode.None;

                 graphics.TextRenderingHint = TextRenderingHint.SingleBitPerPixelGridFit;

             }

         }

     }

 }