public void LoadSignal()
{
lastTime = 0;
inputBuffer = new InputBuffer();
// Open the file dialog to show the file
OpenFileDialog dlg = new OpenFileDialog();
dlg.DefaultExt = ".txt"; // Default file extension
dlg.Filter = "MIT Arrhythmia File (*.txt, *.dat)|*.txt; *.dat"; // Filter files by extension
dlg.Title = "Select PhysioBank MIT-BIH Arrhytmia Signal";
// Show open file dialog box
bool result = (bool)dlg.ShowDialog();
// Process open file dialog box results
if (result == true)
{
// Get file informations
string filePath = dlg.FileName;
string fileName = System.IO.Path.GetFileName(filePath);
string fileExtension = System.IO.Path.GetExtension(filePath);
string directoryPath = System.IO.Path.GetDirectoryName(filePath);
string headerFile = directoryPath + "\\" + fileName.Remove(fileName.IndexOf('.'), fileName.Length - fileName.IndexOf('.')) + ".hea";
/* u svrhe testiranja
* InputBuffer ib1 = new InputBuffer();
* ib1.Open(filePath, 1, FileType.BINARY);
* for (int i = 0; i < 20; i++)
* MessageBox.Show(ib1.ReadOne().ToString());*/
// Determine file type
FileType type = FileType.BINARY;
if (fileExtension == ".txt" || fileExtension == ".TXT")
{
type = FileType.TEXT;
}
// Open the buffer
if (inputBuffer.prepareBinaryInfo(filePath))
{
InputDataProperties iba = new InputDataProperties(inputBuffer.recDescription);
iba.ShowDialog();
if (iba.fc)
{
try
{
short channelForm = Convert.ToInt16(iba.channelToRead);
inputBuffer.Open(filePath, channelForm, type);
}
catch (Exception e)
{
MessageBox.Show("Error opening record file");
}
}
else
{
return;
}
}
else
{
return;
}
}
else
{
return;
}
// Init timer
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
//dispatcherTimer.Interval = new TimeSpan(0, 0, 0, 0, (int)TimeSpan.FromSeconds(1.0/F).TotalMilliseconds);
// Init plot
PlotModel model = new PlotModel {
Title = "EKG Signal"
};
lineSeries = new OxyPlot.Series.LineSeries();
model.Series.Add(lineSeries);
linearAxisY = new LinearAxis();
linearAxisY.MajorStep = 0.5;
linearAxisY.MinorStep = 0.1;
linearAxisY.MajorGridlineStyle = LineStyle.Solid;
linearAxisY.MinorGridlineStyle = LineStyle.Dot;
linearAxisY.Title = "Voltage";
linearAxisY.Unit = "mV";
linearAxisY.IsPanEnabled = false;
linearAxisY.IsZoomEnabled = false;
model.Axes.Add(linearAxisY);
linearAxisX = new LinearAxis();
linearAxisX.MajorStep = 0.2;
linearAxisX.MinorStep = 0.04;
linearAxisX.MajorGridlineStyle = LineStyle.Solid;
linearAxisX.MinorGridlineStyle = LineStyle.Dot;
linearAxisX.Position = AxisPosition.Bottom;
linearAxisX.Title = "Time";
linearAxisX.Unit = "s";
linearAxisX.IsPanEnabled = false;
linearAxisX.IsZoomEnabled = false;
model.Axes.Add(linearAxisX);
MainWindow.Instance.EKG_Plot.Model = model;
}
public abstract void read(InputBuffer ib, int channel);
public override void read(InputBuffer ib, int channel)
{
long fileLength = 0;
try
{
file = new FileStream(filename, FileMode.Open);
reader = new BinaryReader(file);
}
catch (Exception e1)
{
MessageBox.Show(e1.ToString());
}
decimal timeStep = 1 / samplingFrequency;
fileLength = file.Length;
short flag = 0;
Int64 low = 0, high = 0;
byte[] buf = new byte[] { 0, 0, 0 };
for (int i = 0; i < fileLength / 3; i++)
{
for (short j = 1; j <= 2; j++)
{
switch (flag)
{
case 0:
try
{
buf = reader.ReadBytes(3);
}
catch (Exception e2)
{
return;
}
low = buf[1] & 0x0F;
high = buf[1] & 0xF0;
if (channel == j)
{
if (low > 7)
{
while (!ib.Write(sampleNum * timeStep, convertValue(buf[0] + (low << 8) - 4096, zeroADC, channelGain)))
{
;
}
}
else
{
while (!ib.Write(sampleNum * timeStep, convertValue((buf[0] + (low << 8)), zeroADC, channelGain)))
{
;
}
}
}
flag = 1;
break;
case 1:
if (channel == j)
{
if (high > 127)
{
while (!ib.Write(sampleNum * timeStep, convertValue(buf[2] + (high << 4) - 4096, zeroADC, channelGain)))
{
;
}
}
else
{
while (!ib.Write(sampleNum * timeStep, convertValue((buf[2] + (high << 4)), zeroADC, channelGain)))
{
;
}
}
}
flag = 0;
break;
}
}
}
stop();
}