# HG changeset patch
# User Hasan Yavuz ÖZDERYA <hy@ozderya.net>
# Date 2015-09-29 17:20:10
# Node ID dd74a99bcfac577847f4f529e7deaf93e9140cd3
# Parent  aa3c57d8443c6dba890088cbfac596df6a823ad9

implemented load snapshot from csv file

diff --git a/snapshotmanager.cpp b/snapshotmanager.cpp
--- a/snapshotmanager.cpp
+++ b/snapshotmanager.cpp
@@ -2,6 +2,10 @@
 #include <QTime>
 #include <QMenuBar>
 #include <QKeySequence>
+#include <QFileDialog>
+#include <QFile>
+#include <QVector>
+#include <QPointF>
 
 #include "snapshotmanager.h"
 
@@ -9,6 +13,7 @@ SnapshotManager::SnapshotManager(QMainWi
                                  QList<FrameBuffer*>* channelBuffers) :
     _menu("Snapshots"),
     _takeSnapshotAction("Take Snapshot", this),
+    loadSnapshotAction("Load Snapshot", this),
     clearAction("Clear Snapshots", this)
 {
     _mainWindow = mainWindow;
@@ -16,11 +21,14 @@ SnapshotManager::SnapshotManager(QMainWi
 
     _takeSnapshotAction.setToolTip("Take a snapshot of current plot (F5)");
     _takeSnapshotAction.setShortcut(QKeySequence("F5"));
+    loadSnapshotAction.setToolTip("Load a snapshot from CSV file");
     clearAction.setToolTip("Delete all snapshots");
     connect(&_takeSnapshotAction, SIGNAL(triggered(bool)),
             this, SLOT(takeSnapshot()));
     connect(&clearAction, SIGNAL(triggered(bool)),
             this, SLOT(clearSnapshots()));
+    connect(&loadSnapshotAction, SIGNAL(triggered(bool)),
+            this, SLOT(loadSnapshot()));
 
     updateMenu();
 }
@@ -62,6 +70,7 @@ void SnapshotManager::updateMenu()
 {
     _menu.clear();
     _menu.addAction(&_takeSnapshotAction);
+    _menu.addAction(&loadSnapshotAction);
     if (snapshots.size())
     {
         _menu.addSeparator();
@@ -91,6 +100,70 @@ void SnapshotManager::deleteSnapshot(Sna
     updateMenu();
 }
 
+void SnapshotManager::loadSnapshot()
+{
+    QString fileName = QFileDialog::getOpenFileName(_mainWindow, tr("Load CSV File"));
+
+    if (fileName.isNull()) return; // user canceled
+
+    QFile file(fileName);
+    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
+    {
+        qCritical() << "Couldn't open file: " << fileName;
+        qCritical() << file.errorString();
+        return;
+    }
+
+    // read first row as headlines and determine number of channels
+    auto headLine = QString(file.readLine());
+    unsigned numOfChannels = headLine.split(',').size();
+
+    // read data
+    QVector<QVector<QPointF>> data(numOfChannels);
+    unsigned lineNum = 1;
+    while (file.canReadLine())
+    {
+        // parse line
+        auto line = QString(file.readLine());
+        auto split = line.split(',');
+
+        if (split.size() != (int) numOfChannels)
+        {
+            qCritical() << "Parsing error at line " << lineNum
+                        << ": number of columns is not consistent.";
+            return;
+        }
+
+        for (unsigned ci = 0; ci < numOfChannels; ci++)
+        {
+            // parse column
+            bool ok;
+            double y = split[ci].toDouble(&ok);
+            if (!ok)
+            {
+                qCritical() << "Parsing error at line " << lineNum
+                            << ", column " << ci
+                            << ": can't convert \"" << split[ci]
+                            << "\" to double.";
+                return;
+            }
+            data[ci].append(QPointF(lineNum-1, y));
+        }
+        lineNum++;
+    }
+
+    auto snapShot = new SnapShot(_mainWindow, QFileInfo(fileName).baseName());
+    snapShot->data = data;
+
+    snapshots.append(snapShot);
+    QObject::connect(snapShot, &SnapShot::deleteRequested,
+                     this, &SnapshotManager::deleteSnapshot);
+    QObject::connect(snapShot, &SnapShot::deleteRequested,
+                     this, &SnapshotManager::updateMenu);
+
+    updateMenu();
+}
+
 QMenu* SnapshotManager::menu()
 {
     return &_menu;
diff --git a/snapshotmanager.h b/snapshotmanager.h
--- a/snapshotmanager.h
+++ b/snapshotmanager.h
@@ -30,6 +30,7 @@ private:
 
     QMenu _menu;
     QAction _takeSnapshotAction;
+    QAction loadSnapshotAction;
     QAction clearAction;
 
     void updateMenu();
@@ -38,6 +39,7 @@ private slots:
     void takeSnapshot();
     void clearSnapshots();
     void deleteSnapshot(SnapShot* snapshot);
+    void loadSnapshot();
 };
 
 #endif /* SNAPSHOTMANAGER_H */