# HG changeset patch
# User Hasan Yavuz ÖZDERYA <hy@ozderya.net>
# Date 2017-02-12 15:04:38
# Node ID b44879156c7c6b6dfd8836d7cf0e95f077c23f08
# Parent  954ac648eea9a5f6194348a8bb1937181ead9f8b

implemented data writing not yet integrated

diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -106,6 +106,7 @@ add_executable(${PROGRAM_NAME} WIN32
   src/dataformatpanel.cpp
   src/plotcontrolpanel.cpp
   src/recordpanel.cpp
+  src/datarecorder.cpp
   src/tooltipfilter.cpp
   src/sneakylineedit.cpp
   src/channelmanager.cpp
diff --git a/src/datarecorder.cpp b/src/datarecorder.cpp
--- a/src/datarecorder.cpp
+++ b/src/datarecorder.cpp
@@ -19,22 +19,67 @@
 
 #include "datarecorder.h"
 
-DataRecorder::DataRecorder(QObject *parent) : QObject(parent)
+#include <QtDebug>
+
+DataRecorder::DataRecorder(QObject *parent) :
+    QObject(parent),
+    fileStream(&file)
 {
-
+    lastNumChannels = 0;
 }
 
 bool DataRecorder::startRecording(QString fileName, QStringList channelNames)
 {
+    Q_ASSERT(!file.isOpen());
 
+    // open file
+    file.setFileName(fileName);
+    if (!file.open(QIODevice::WriteOnly))
+    {
+        qCritical() << "Opening file " << fileName
+                    << " for recording failed with error: " << file.error();
+        return false;
+    }
+
+    // write header line
+    if (!channelNames.isEmpty())
+    {
+        fileStream << channelNames.join(",");
+        fileStream << "\n";
+        lastNumChannels = channelNames.length();
+    }
+    return true;
 }
 
 void DataRecorder::addData(double* data, unsigned length, unsigned numOfChannels)
 {
+    Q_ASSERT(length > 0);
+    Q_ASSERT(length % numOfChannels == 0);
 
+    if (lastNumChannels != 0 && numOfChannels != lastNumChannels)
+    {
+        qWarning() << "Number of channels changed from " << lastNumChannels
+                   << " to " << numOfChannels <<
+            " during recording, CSV file is corrupted but no data will be lost.";
+    }
+    lastNumChannels = numOfChannels;
+
+    unsigned numOfSamples = length / numOfChannels; // per channel
+    for (unsigned int i = 0; i < numOfSamples; i++)
+    {
+        for (unsigned ci = 0; ci < numOfChannels; ci++)
+        {
+            fileStream << data[ci * numOfSamples + i];
+            if (ci != numOfChannels-1) fileStream << ",";
+        }
+        fileStream << '\n';
+    }
 }
 
 void DataRecorder::stopRecording()
 {
+    Q_ASSERT(file.isOpen());
 
+    file.close();
+    lastNumChannels = 0;
 }
diff --git a/src/datarecorder.h b/src/datarecorder.h
--- a/src/datarecorder.h
+++ b/src/datarecorder.h
@@ -21,6 +21,8 @@
 #define DATARECORDER_H
 
 #include <QObject>
+#include <QFile>
+#include <QTextStream>
 
 class DataRecorder : public QObject
 {
@@ -63,6 +65,8 @@ public:
 
 private:
     unsigned lastNumChannels;   ///< used for error message only
+    QFile file;
+    QTextStream fileStream;
 };
 
 #endif // DATARECORDER_H
diff --git a/src/recordpanel.cpp b/src/recordpanel.cpp
--- a/src/recordpanel.cpp
+++ b/src/recordpanel.cpp
@@ -33,7 +33,8 @@ RecordPanel::RecordPanel(QWidget *parent
     QWidget(parent),
     ui(new Ui::RecordPanel),
     recordToolBar(tr("Record Toolbar")),
-    recordAction(QIcon::fromTheme("media-record"), tr("Record"), this)
+    recordAction(QIcon::fromTheme("media-record"), tr("Record"), this),
+    recorder(this)
 {
     overwriteSelected = false;
 
@@ -196,12 +197,22 @@ bool RecordPanel::confirmOverwrite(QStri
 
 void RecordPanel::startRecording(void)
 {
-    // TODO
     qDebug() << "start recording";
+
+    // TEST CODE
+    QStringList cn;
+    cn << "chan0" << "chan1" << "chan2";
+
+    recorder.startRecording(selectedFile, cn);
+
+    // add test data
+    double data[3] = {15., 15., 15.};
+    recorder.addData(data, 3, 3);
 }
 
 void RecordPanel::stopRecording(void)
 {
     // TODO
     qDebug() << "stop recording";
+    recorder.stopRecording();
 }
diff --git a/src/recordpanel.h b/src/recordpanel.h
--- a/src/recordpanel.h
+++ b/src/recordpanel.h
@@ -25,6 +25,8 @@
 #include <QToolBar>
 #include <QAction>
 
+#include "datarecorder.h"
+
 namespace Ui {
 class RecordPanel;
 }
@@ -45,6 +47,7 @@ private:
     QAction recordAction;
     QString selectedFile;
     bool overwriteSelected;
+    DataRecorder recorder;
 
     /**
      * @brief Increments the file name.