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diff --git a/tkblt/generic/tkbltGraphBar.h b/tkblt/generic/tkbltGraphBar.h
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+++ b/tkblt/generic/tkbltGraphBar.h
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+/*
+ * Smithsonian Astrophysical Observatory, Cambridge, MA, USA
+ * This code has been modified under the terms listed below and is made
+ * available under the same terms.
+ */
+
+/*
+ *	Copyright 1993-2004 George A Howlett.
+ *
+ *	Permission is hereby granted, free of charge, to any person obtaining
+ *	a copy of this software and associated documentation files (the
+ *	"Software"), to deal in the Software without restriction, including
+ *	without limitation the rights to use, copy, modify, merge, publish,
+ *	distribute, sublicense, and/or sell copies of the Software, and to
+ *	permit persons to whom the Software is furnished to do so, subject to
+ *	the following conditions:
+ *
+ *	The above copyright notice and this permission notice shall be
+ *	included in all copies or substantial portions of the Software.
+ *
+ *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *	EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *	MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *	NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *	LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *	OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *	WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __BltGraphBar_h__
+#define __BltGraphBar_h__
+
+#include <tk.h>
+
+#include "tkbltGraph.h"
+
+namespace Blt {
+
+  typedef struct {
+    double value;
+    Axis* xAxis;
+    Axis* yAxis;
+  } BarSetKey;
+
+  class BarGroup {
+  public:
+    int nSegments;
+    Axis* xAxis;
+    Axis* yAxis;
+    double sum;
+    int count;
+    double lastY;
+    size_t index;
+
+  public:
+    BarGroup();
+  };
+
+  typedef struct {
+    double aspect;
+    Tk_3DBorder normalBg;
+    int borderWidth;
+    Margin margins[4];
+    Tk_Cursor cursor;
+    TextStyleOptions titleTextStyle;
+    int reqHeight;
+    XColor* highlightBgColor;
+    XColor* highlightColor;
+    int highlightWidth;
+    int inverted;
+    Tk_3DBorder plotBg;
+    int plotBW;
+    int xPad;
+    int yPad;
+    int plotRelief;
+    int relief;
+    ClosestSearch search;
+    int stackAxes;
+    const char *takeFocus; // nor used in C code
+    const char *title;
+    int reqWidth;
+    int reqPlotWidth;
+    int reqPlotHeight;
+
+    // bar graph
+    int barMode;
+    double barWidth;
+    double baseline;
+  } BarGraphOptions;
+
+  class BarGraph : public Graph {
+  public:
+    enum BarMode {INFRONT, STACKED, ALIGNED, OVERLAP};
+
+  public:
+    BarGroup* barGroups_;
+    int nBarGroups_;
+    Tcl_HashTable setTable_;
+    int maxBarSetSize_;
+
+  protected:
+    void resetAxes();
+    void mapElements();
+    void initBarSets();
+    void destroyBarSets();
+    void resetBarSets();
+    void computeBarStacks();
+
+  public:
+    BarGraph(ClientData, Tcl_Interp*, int, Tcl_Obj* const []);
+    virtual ~BarGraph();
+
+    int configure();
+    int createPen(const char*, int, Tcl_Obj* const []);
+    int createElement(int, Tcl_Obj* const []);
+  };
+};
+
+#endif