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diff --git a/src/lingot-mainframe.h b/src/lingot-mainframe.h
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+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot 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 lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_MAIN_FRAME_H__
+#define __LINGOT_MAIN_FRAME_H__
+
+#include "lingot-defs.h"
+#include "lingot-core.h"
+#include "lingot-gauge.h"
+#include "lingot-config.h"
+#include "lingot-config-dialog.h"
+#include "lingot-filter.h"
+
+#include <gtk/gtk.h>
+
+// Window that contains all controls, graphics, etc. of the tuner.
+
+//typedef struct _LingotMainFrame LingotMainFrame;
+
+struct _LingotMainFrame
+  {
+
+    // gtk widgets
+    GtkWidget* gauge_area;
+    GtkWidget* spectrum_area;
+    GtkWidget* note_label;
+
+    GtkWidget* freq_label;
+    GtkWidget* error_label;
+
+    GdkPixmap* pix_spectrum;
+    GdkPixmap* pix_stick;
+
+    GtkScrolledWindow* spectrum_scroll;
+    
+    LingotFilter* freq_filter;
+
+    LingotGauge* gauge;
+
+    LingotCore* core;
+
+    GtkWidget* win;
+
+    GdkColor gauge_color;
+    GdkColor spectrum_color;
+
+    LingotConfigDialog* config_dialog;
+    LingotConfig* conf;
+
+    // timer uids
+    guint visualization_timer_uid;
+    guint calculation_timer_uid;
+    guint freq_timer_uid;
+  };
+
+LingotMainFrame* lingot_mainframe_new(int argc, char *argv[]);
+void lingot_mainframe_destroy(LingotMainFrame*);
+
+void lingot_mainframe_run(LingotMainFrame*);
+void lingot_mainframe_change_config(LingotMainFrame*, LingotConfig*);
+
+#endif //__LINGOT_MAIN_FRAME_H__