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diff --git a/gr-qtgui/lib/const_sink_c_impl.h b/gr-qtgui/lib/const_sink_c_impl.h
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+++ b/gr-qtgui/lib/const_sink_c_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 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_CONST_SINK_C_IMPL_H
+#define INCLUDED_QTGUI_CONST_SINK_C_IMPL_H
+
+#include <qtgui/const_sink_c.h>
+#include <gruel/high_res_timer.h>
+#include <gruel/thread.h>
+#include <constellationdisplayform.h>
+
+namespace gr {
+  namespace qtgui {
+    
+    class QTGUI_API const_sink_c_impl : public const_sink_c
+    {
+    private:
+      void initialize();
+
+      gruel::mutex d_mutex;
+
+      int d_size;
+      std::string d_name;
+      int d_nconnections;
+
+      int d_index;
+      std::vector<double*> d_residbufs_real;
+      std::vector<double*> d_residbufs_imag;
+
+      QWidget *d_parent;
+      ConstellationDisplayForm *d_main_gui;
+
+      gruel::high_res_timer_type d_update_time;
+      gruel::high_res_timer_type d_last_time;
+
+      void npoints_resize();
+
+    public:
+      const_sink_c_impl(int size,
+			const std::string &name,
+			int nconnections,
+			QWidget *parent=NULL);
+      ~const_sink_c_impl();
+
+      void exec_();
+      QWidget*  qwidget();
+      PyObject* pyqwidget();
+
+      void set_y_axis(double min, double max);
+      void set_x_axis(double min, double max);
+
+      void set_update_time(double t);
+      void set_title(const std::string &title);
+      void set_line_label(int which, const std::string &label);
+      void set_line_color(int which, const std::string &color);
+      void set_line_width(int which, int width);
+      void set_line_style(int which, Qt::PenStyle style);
+      void set_line_marker(int which, QwtSymbol::Style marker);
+      void set_nsamps(const int size);
+
+      void set_size(int width, int height);
+
+      int nsamps() const;
+      void reset();
+
+      int work(int noutput_items,
+	       gr_vector_const_void_star &input_items,
+	       gr_vector_void_star &output_items);
+    };
+
+  } /* namespace qtgui */
+} /* namespace gr */
+
+#endif /* INCLUDED_QTGUI_CONST_SINK_C_IMPL_H */