diff --git a/plotsnapshotoverlay.h b/plotsnapshotoverlay.h
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+/*
+  Copyright © 2015 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 PLOTSNAPSHOTOVERLAY_H
+#define PLOTSNAPSHOTOVERLAY_H
+
+#include <QColor>
+#include <QPainter>
+#include <QTimer>
+#include <qwt_widget_overlay.h>
+
+// Draws a sort of flashing effect on plot widget when snapshot taken
+class PlotSnapshotOverlay : public QwtWidgetOverlay
+{
+    Q_OBJECT
+
+public:
+    PlotSnapshotOverlay(QWidget* widget, QColor color);
+
+protected:
+    void drawOverlay(QPainter*) const;
+
+signals:
+    void done(); // indicates that animation completed
+
+private:
+    QColor _color;
+    QTimer animTimer; // controls fading
+    QTimer updateTimer; // need to force repaint the canvas
+};
+
+#endif // PLOTSNAPSHOTOVERLAY_H