diff --git a/src/indexbuffer.cpp b/src/indexbuffer.cpp
new file mode 100644
--- /dev/null
+++ b/src/indexbuffer.cpp
@@ -0,0 +1,49 @@
+/*
+  Copyright © 2017 Hasan Yavuz Özderya
+
+  This file is part of serialplot.
+
+  serialplot 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 3 of the License, or
+  (at your option) any later version.
+
+  serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <QtGlobal>
+
+#include "indexbuffer.h"
+
+IndexBuffer::IndexBuffer(unsigned n)
+{
+    _size = n;
+}
+
+unsigned IndexBuffer::size() const
+{
+    return _size;
+}
+
+void IndexBuffer::resize(unsigned n)
+{
+    _size = n;
+}
+
+double IndexBuffer::sample(unsigned i) const
+{
+    Q_ASSERT(i < _size);
+
+    return i;
+}
+
+Range IndexBuffer::limits() const
+{
+    return Range{0, _size-1.};
+}