Basic GUI for export.

1 files changed, 56 insertions, 0 deletions

diff --git a/src/lib/event_history.cc b/src/lib/event_history.cc
new file mode 100644
index 000000000..eb3438aab
--- /dev/null
+++ b/src/lib/event_history.cc
@@ -0,0 +1,56 @@
+/*
+    Copyright (C) 2017 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "event_history.h"
+#include "util.h"
+#include <boost/thread/mutex.hpp>
+
+EventHistory::EventHistory (int size)
+	: _size (size)
+{
+
+}
+
+float
+EventHistory::rate () const
+{
+	boost::mutex::scoped_lock lock (_mutex);
+	if (int (_history.size()) < _size) {
+		return 0;
+	}
+
+	struct timeval now;
+	gettimeofday (&now, 0);
+
+	return _size / (seconds (now) - seconds (_history.back ()));
+}
+
+void
+EventHistory::event ()
+{
+	boost::mutex::scoped_lock lock (_mutex);
+
+	struct timeval tv;
+	gettimeofday (&tv, 0);
+	_history.push_front (tv);
+	if (int (_history.size()) > _size) {
+		_history.pop_back ();
+	}
+}