diff --git a/src/indexbuffer.h b/src/indexbuffer.h
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--- /dev/null
+++ b/src/indexbuffer.h
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+/*
+  Copyright © 2018 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/>.
+*/
+
+#ifndef INDEXBUFFER_H
+#define INDEXBUFFER_H
+
+#include "framebuffer.h"
+
+/// A simple frame buffer that simply returns requested index as
+/// sample value.
+///
+/// @note This buffer isn't for storing data.
+class IndexBuffer : public ResizableBuffer
+{
+public:
+    IndexBuffer(unsigned n);
+
+    unsigned size() const;
+    double sample(unsigned i) const;
+    Range limits() const;
+    void resize(unsigned n);
+
+private:
+    unsigned _size;
+};
+
+#endif