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diff --git a/gr-qtgui/lib/waterfalldisplayform.h b/gr-qtgui/lib/waterfalldisplayform.h
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index 0000000000..46e0d815e0
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+++ b/gr-qtgui/lib/waterfalldisplayform.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 WATERFALL_DISPLAY_FORM_H
+#define WATERFALL_DISPLAY_FORM_H
+
+#include <spectrumUpdateEvents.h>
+#include <WaterfallDisplayPlot.h>
+#include <QtGui/QtGui>
+#include <vector>
+#include <filter/firdes.h>
+
+#include "displayform.h"
+
+class WaterfallDisplayForm : public DisplayForm
+{
+  Q_OBJECT
+
+  public:
+  WaterfallDisplayForm(int nplots=1, QWidget* parent = 0);
+  ~WaterfallDisplayForm();
+
+  WaterfallDisplayPlot* getPlot();
+
+  int GetFFTSize() const;
+  float GetFFTAverage() const;
+  gr::filter::firdes::win_type GetFFTWindowType() const;
+
+public slots:
+  void customEvent(QEvent *e);
+
+  void SetFFTSize(const int);
+  void SetFFTAverage(const float);
+  void SetFFTWindowType(const gr::filter::firdes::win_type);
+
+  void SetFrequencyRange(const double newCenterFrequency,
+			 const double newStartFrequency,
+			 const double newStopFrequency);
+
+  void SetIntensityRange(const double minIntensity,
+			 const double maxIntensity);
+
+  void SetColorMap(const int newType,
+		   const QColor lowColor,
+		   const QColor highColor);
+
+  void AutoScale();
+
+private slots:
+  void newData(const QEvent *updateEvent);
+
+private:
+  uint64_t _numRealDataPoints;
+  QIntValidator* _intValidator;
+
+  double _startFrequency;
+  double _stopFrequency;
+
+  int _fftsize;
+  float _fftavg;
+  gr::filter::firdes::win_type _fftwintype;
+
+  double _min_val;
+  double _max_val;
+};
+
+#endif /* WATERFALL_DISPLAY_FORM_H */