/// <summary>
/// Push a PixelInfo into this
/// If info.Max is bigger than Max,Max=info.Max.
/// If info.Min is smaller than Min,Min=info.Min.
/// If has no data,Min=info.Min and Max=info.Max
/// </summary>
/// <param name="info">The PixelInfo pushed into</param>
public void Push(PixelInfo info)
{
if(Min == -1)
{
Min = info.Min;
Max = info.Max;
}
else
{
if (info.Min < Min)
Min = info.Min;
if (info.Max > Max)
Max = info.Max;
}
}
public static WaveData Read2Channels(Stream stream,int sampleNumber,int width,Func<BinaryReader,short> reader)
{
var l = new PixelInfo[width];
var r = new PixelInfo[width];
var samplesPerPixel = (double)sampleNumber / (double)width;
using (var br = new BinaryReader(stream))
{
var drawedSample = 0;
for (int i = 0; i < width; i++)
{
var drawSample = 0;
if (i == width - 1)
drawSample = sampleNumber - drawedSample;
else
{
drawSample = (int)((i + 1) * samplesPerPixel - drawedSample);
}
var lInfo = new PixelInfo();
var rInfo = new PixelInfo();
for (int j = 0; j < drawSample; j++)
{
try
{
lInfo.Push((short)(reader(br)));
rInfo.Push((short)(reader(br)));
}
catch
{
drawedSample += j;
}
}
l[i] = lInfo;
r[i] = rInfo;
drawedSample += drawSample;
}
return new WaveData(null,l,r);
}
}
public WaveData(PixelInfo[] channel = null,PixelInfo[] leftChannel = null,PixelInfo[] rightChannel = null)
{
Channel = channel;
LeftChannel = leftChannel;
RightChannel = rightChannel;
}
private static WaveData Read1Channel(Stream stream,int sampleNumber,int width,Func<BinaryReader,short> reader)
{
var result = new PixelInfo[width];
var samplesPerPixel = (double)sampleNumber / (double)width;
using (var br = new BinaryReader(stream))
{
var drawedSample = 0;
for (int i = 0; i < width; i++)
{
var drawSample = 0;
if (i == width - 1)
drawSample = sampleNumber - drawedSample;
else
{
drawSample = (int)((i+1)*samplesPerPixel - drawedSample);
}
var pixInfo = new PixelInfo();
for (int j = 0; j < drawSample; j++)
{
try
{
pixInfo.Push(reader(br));
}
catch
{
drawedSample += j;
}
}
drawedSample += drawSample;
result[i] = pixInfo;
}
return new WaveData(result);
}
}
/// <summary>
/// Draw one channel.
/// For single channel wave, it draws the channel and wave grid.
/// For two channel wave,use this method to draw one channel of two.
/// </summary>
/// <param name="info">chached sample info</param>
/// <param name="style">style of the wave</param>
/// <param name="startPer">the percent of start position</param>
/// <param name="scale">scale</param>
/// <param name="width">width of the return bitmap</param>
/// <param name="height">height of the return bitmap</param>
/// <returns>bitmap that the wave drawed on</returns>
public static ImageSource Draw1Channel(PixelInfo[] info,WaveStyle style, double startPer, double scale,double width, double height=-1)
{
if (width <= 0) return null;
if (info.Length < width)
return null;
if (height == -1)
height = WavFile.MinHeight;
var startPos = (int)(info.Length * startPer);
var sampleNumber = (int)(info.Length * scale);
if (startPos + sampleNumber > info.Length)
startPos = info.Length - sampleNumber;
var samplesPerPixel = (double)sampleNumber / width;
DrawingVisual dv = new DrawingVisual();
var dc = dv.RenderOpen();
var pen = new Pen(style.WaveBrush, 1);
var gridPen = new Pen(style.GridBrush, 0.2);
gridPen.Freeze();
pen.Freeze();
//draw wave grid
var hNumber = GetGridNumber(height / 2, 50);
var k = height / (2 * hNumber);
for (int i = 1; i < hNumber; i++)
{
dc.DrawLine(gridPen, new Point(0, i * k), new Point(width, i * k));
dc.DrawLine(gridPen, new Point(0, height/2 + i * k), new Point(width, height/2 + i * k));
}
var vNumber = GetGridNumber(width, 100);
var vGridSpace = width / vNumber;
for (int i = 1; i < vNumber; i++)
{
dc.DrawLine(gridPen, new Point(i * vGridSpace, 0), new Point(i * vGridSpace, height));
}
//draw wave
var drawedSample = 0;
PixelInfo prePixel = null;
for (int i = 0; i < width; i++)
{
var drawSample = 0;
if (i == width - 1)
drawSample = sampleNumber - drawedSample;
else
{
drawSample = (int)((i + 1) * samplesPerPixel - drawedSample);
}
var tempInfo = new PixelInfo();
for (int j = 0; j < drawSample; j++)
{
tempInfo.Push(info[startPos + drawedSample + j]);
}
var min = tempInfo.Min;
var max = tempInfo.Max;
if(height != WavFile.MinHeight)
{
min = (short)ScaleToHeight(min, height);
max = (short)ScaleToHeight(max, height);
}
dc.DrawLine(pen, new Point(i, min), new Point(i, max));
if (prePixel == null)
{
prePixel = new PixelInfo
{
Min = min,
Max = max,
};
}
else
{
if(prePixel.Max < min)
{
dc.DrawLine(pen, new Point(i - 1, prePixel.Max), new Point(i, min));
}
if (prePixel.Min > max)
{
dc.DrawLine(pen, new Point(i - 1, prePixel.Min), new Point(i, max));
}
prePixel.Max = max;
prePixel.Min = min;
}
drawedSample += drawSample;
}
dc.Close();
var bmp = new RenderTargetBitmap((int)width, (int)height, 0, 0, PixelFormats.Default);
bmp.Render(dv);
return bmp;
}
/// <summary>
/// Draw two channels
/// </summary>
/// <param name="lInfo">cached samples of the left channel</param>
/// <param name="rInfo">cached samples of the right channel</param>
/// <param name="style">style of the wave</param>
/// <param name="startPer">the percent of the start position</param>
/// <param name="scale">scale</param>
/// <param name="width">the width of the return bitmap</param>
/// <param name="height">the height of the return bitmap</param>
/// <returns>bitmap that the wave drawed on</returns>
public static ImageSource Draw2Channel(PixelInfo[] lInfo, PixelInfo[] rInfo, WaveStyle style, double startPer, double scale, double width, double height=-1)
{
if (width <= 0) return null;
if (lInfo.Length < width)
return null;
var startPos = (int)(lInfo.Length * startPer);
var sampleNumber = (int)(lInfo.Length * scale);
if (startPos + sampleNumber > lInfo.Length)
startPos = lInfo.Length - sampleNumber;
var samplesPerPixel = (double)sampleNumber / width;
if (height == -1)
height = WavFile.MinHeight;
var singleHeight = height / 2;
DrawingVisual dv = new DrawingVisual();
var dc = dv.RenderOpen();
var pen = new Pen(style.WaveBrush, 1);
var linePen = new Pen(style.WaveBrush, 1);
pen.Freeze();
//draw wave
var drawedSample = 0;
PixelInfo lprePixel = null;
PixelInfo rprePixel = null;
for (int i = 0; i < width; i++)
{
var drawSample = 0;
if (i == width - 1)
drawSample = sampleNumber - drawedSample;
else
{
drawSample = (int)((i + 1) * samplesPerPixel - drawedSample);
}
var lTemp = new PixelInfo();
var rTemp = new PixelInfo();
for (int j = 0; j < drawSample; j++)
{
lTemp.Push(lInfo[startPos + drawedSample + j]);
rTemp.Push(rInfo[startPos + drawedSample + j]);
}
var lmin = lTemp.Min;
var lmax = lTemp.Max;
var rmin = rTemp.Min;
var rmax = rTemp.Max;
if (height != -1)
{
lmin = (short)ScaleToHeight(lmin, height);
lmax = (short)ScaleToHeight(lmax, height);
rmin = (short)ScaleToHeight(rmin, height);
rmax = (short)ScaleToHeight(rmax, height);
}
dc.DrawLine(pen, new Point(i , lmin/2), new Point(i , lmax/2));
dc.DrawLine(pen, new Point(i , rmin/2 + singleHeight), new Point(i , rmax/2 + singleHeight));
if(lprePixel == null)
{
lprePixel = new PixelInfo
{
Max = lmax,
Min = lmin,
};
}
else
{
if(lprePixel.Max < lmin)
dc.DrawLine(pen, new Point(i-1, lprePixel.Max / 2), new Point(i, lmin / 2));
if(lprePixel.Min > lmax)
dc.DrawLine(pen, new Point(i-1, lprePixel.Min / 2), new Point(i, lmax / 2));
}
if(rprePixel == null)
{
rprePixel = new PixelInfo
{
Max = rmax,
Min = rmin,
};
}
else
{
if (rprePixel.Max < rmin)
dc.DrawLine(pen, new Point(i - 1, rprePixel.Max / 2), new Point(i, rmin / 2));
if (rprePixel.Min > rmax)
dc.DrawLine(pen, new Point(i - 1, rprePixel.Min / 2), new Point(i, rmax / 2));
}
drawedSample += drawSample;
}
dc.Close();
var bmp = new RenderTargetBitmap((int)width, (int)height, 0, 0, PixelFormats.Default);
bmp.Render(dv);
return bmp;
}