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diff --git a/gr-qtgui/lib/qtgui_sink_c.h b/gr-qtgui/lib/qtgui_sink_c.h
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+++ b/gr-qtgui/lib/qtgui_sink_c.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2009,2011 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 INCLUDED_QTGUI_SINK_C_H
+#define INCLUDED_QTGUI_SINK_C_H
+
+#include <Python.h>
+#include <gr_qtgui_api.h>
+#include <gr_block.h>
+#include <gr_firdes.h>
+#include <gri_fft.h>
+#include <qapplication.h>
+#include "SpectrumGUIClass.h"
+
+class qtgui_sink_c;
+typedef boost::shared_ptr<qtgui_sink_c> qtgui_sink_c_sptr;
+
+GR_QTGUI_API qtgui_sink_c_sptr qtgui_make_sink_c (int fftsize, int wintype,
+				     double fc=0, double bandwidth=1.0,
+				     const std::string &name="Spectrum Display",
+				     bool plotfreq=true, bool plotwaterfall=true,
+				     bool plottime=true, bool plotconst=true,
+				     QWidget *parent=NULL);
+
+class GR_QTGUI_API qtgui_sink_c : public gr_block
+{
+private:
+  friend GR_QTGUI_API qtgui_sink_c_sptr qtgui_make_sink_c (int fftsize, int wintype,
+					      double fc, double bw,
+					      const std::string &name,
+					      bool plotfreq, bool plotwaterfall,
+					      bool plottime, bool plotconst,
+					      QWidget *parent);
+  qtgui_sink_c (int fftsize, int wintype,
+		double fc, double bw, 
+		const std::string &name,
+		bool plotfreq, bool plotwaterfall,
+		bool plottime, bool plotconst,
+		QWidget *parent);
+
+  void forecast(int noutput_items, gr_vector_int &ninput_items_required);
+
+  void initialize();
+
+  int d_fftsize;
+  gr_firdes::win_type d_wintype;
+  std::vector<float> d_window;
+  double d_center_freq;
+  double d_bandwidth;
+  std::string d_name;
+  
+  bool d_shift;
+  gri_fft_complex *d_fft;
+
+  int d_index;
+  gr_complex *d_residbuf;
+
+  bool d_plotfreq, d_plotwaterfall, d_plottime, d_plotconst;
+  
+  double d_update_time;
+
+  QWidget *d_parent;
+  SpectrumGUIClass *d_main_gui;
+
+  void windowreset();
+  void buildwindow();
+  void fftresize();
+  void fft(const gr_complex *data_in, int size);
+  
+public:
+  ~qtgui_sink_c();
+  void exec_();
+  QWidget*  qwidget();
+  PyObject* pyqwidget();
+
+  void set_frequency_range(const double centerfreq,
+			   const double bandwidth);
+
+  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);
+  void set_frequency_axis(double min, double max);
+
+  void set_update_time(double t);
+
+  QApplication *d_qApplication;
+
+  int general_work (int noutput_items,
+		    gr_vector_int &ninput_items,
+		    gr_vector_const_void_star &input_items,
+		    gr_vector_void_star &output_items);
+};
+
+#endif /* INCLUDED_QTGUI_SINK_C_H */