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diff --git a/gr-qtgui/include/qtgui/sink_c.h b/gr-qtgui/include/qtgui/sink_c.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2009,2011,2012 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 INCLUDED_QTGUI_SINK_C_H
+#define INCLUDED_QTGUI_SINK_C_H
+
+#include <Python.h>
+#include <qtgui/api.h>
+#include <gr_block.h>
+#include <qapplication.h>
+#include <qwt_symbol.h>
+
+
+namespace gr {
+  namespace qtgui {
+
+    /*!
+     * \brief A graphical sink to display freq, spec, time, and const plots.
+     * \ingroup qtgui_blk
+     *
+     * This is a QT-based graphical sink the takes a complex stream and
+     * plots it. The default action is to plot the signal as a PSD (FFT),
+     * spectrogram (waterfall), time domain I&Q, and constellation (I
+     * vs. Q) plots. The plots may be turned off by setting the
+     * appropriate boolean value in the constructor to False.
+     */
+
+    class QTGUI_API sink_c : virtual public gr_block
+    {
+    public:
+      // gr::qtgui::sink_c::sptr
+      typedef boost::shared_ptr<sink_c> sptr;
+
+      /*!
+       * \brief Build a complex qtgui sink.
+       *
+       * \param fftsize size of the FFT to compute and display
+       * \param wintype type of window to apply (see filter/firdes.h)
+       * \param fc center frequency of signal (use for x-axis labels)
+       * \param bw bandwidth of signal (used to set x-axis labels)
+       * \param name title for the plot
+       * \param plotfreq Toggle frequency plot on/off
+       * \param plotwaterfall Toggle waterfall plot on/off
+       * \param plottime Toggle time plot on/off
+       * \param plotconst Toggle constellation plot on/off
+       * \param parent a QWidget parent object, if any
+       */
+      static sptr make(int fftsize, int wintype,
+		       double fc, double bw,
+		       const std::string &name,
+		       bool plotfreq, bool plotwaterfall,
+		       bool plottime, bool plotconst,
+		       QWidget *parent=NULL);
+
+      virtual void exec_() = 0;
+      virtual PyObject* pyqwidget() = 0;
+
+      virtual void set_fft_size(const int fftsize) = 0;
+      virtual int fft_size() const = 0;
+
+      virtual void set_frequency_range(const double centerfreq,
+				       const double bandwidth) = 0;
+      virtual void set_fft_power_db(double min, double max) = 0;
+
+      //void set_time_domain_axis(double min, double max);
+      //void set_constellation_axis(double xmin, double xmax,
+      //                            double ymin, double ymax);
+      //void set_constellation_pen_size(int size);
+
+      virtual void set_update_time(double t) = 0;
+
+      QApplication *d_qApplication;
+    };
+
+  } /* namespace qtgui */
+} /* namespace gr */
+
+#endif /* INCLUDED_QTGUI_SINK_C_H */