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diff --git a/gr-qtgui/lib/ConstellationDisplayPlot.h b/gr-qtgui/lib/ConstellationDisplayPlot.h
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+++ b/gr-qtgui/lib/ConstellationDisplayPlot.h
@@ -0,0 +1,92 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2009,2010,2011 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef CONSTELLATION_DISPLAY_PLOT_HPP
+#define CONSTELLATION_DISPLAY_PLOT_HPP
+
+#include <stdint.h>
+#include <cstdio>
+#include <qwt_plot.h>
+#include <qwt_painter.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_curve.h>
+#include <qwt_scale_engine.h>
+#include <qwt_scale_widget.h>
+#include <qwt_plot_zoomer.h>
+#include <qwt_plot_panner.h>
+#include <qwt_plot_marker.h>
+#include <highResTimeFunctions.h>
+#include <qwt_symbol.h>
+#include <qtgui_util.h>
+
+class ConstellationDisplayPlot : public QwtPlot
+{
+  Q_OBJECT
+
+public:
+  ConstellationDisplayPlot(QWidget*);
+  virtual ~ConstellationDisplayPlot();
+
+  void PlotNewData(const double* realDataPoints, 
+		   const double* imagDataPoints, 
+		   const int64_t numDataPoints,
+		   const double timeInterval);
+    
+  virtual void replot();
+
+  void set_xaxis(double min, double max);
+  void set_yaxis(double min, double max);
+  void set_axis(double xmin, double xmax,
+		double ymin, double ymax);
+  void set_pen_size(int size);
+
+public slots:
+  void resizeSlot( QSize *s );
+
+  void OnPickerPointSelected(const QwtDoublePoint & p);
+
+signals:
+  void plotPointSelected(const QPointF p);
+
+protected slots:
+  void LegendEntryChecked(QwtPlotItem *plotItem, bool on);
+
+protected:
+
+private:
+  QwtPlotCurve* _plot_curve;
+
+  QwtPlotPanner* _panner;
+  QwtPlotZoomer* _zoomer;
+  
+  QwtDblClickPlotPicker *_picker;
+
+  double* _realDataPoints;
+  double* _imagDataPoints;
+
+  timespec _lastReplot;
+
+  int64_t _numPoints;
+  int64_t _penSize;
+};
+
+#endif /* CONSTELLATION_DISPLAY_PLOT_HPP */