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diff --git a/src/tkbltGrMisc.h b/src/tkbltGrMisc.h
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@@ -0,0 +1,109 @@
+/*
+ * 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 __BltGrMisc_h__
+#define __BltGrMisc_h__
+
+#include <iostream>
+#include <sstream>
+#include <iomanip>
+using namespace std;
+
+#include <tk.h>
+
+#ifndef MIN
+#   define MIN(x,y) ((x)<(y)?(x):(y))
+#endif
+
+#ifndef MAX
+#   define MAX(x,y) ((x)>(y)?(x):(y))
+#endif
+
+#define	GRAPH_DELETED   (1<<1)
+#define REDRAW_PENDING  (1<<2)
+#define FOCUS           (1<<3)
+
+#define	MAP_ITEM        (1<<4)
+
+#define RESET           (1<<5)
+#define LAYOUT          (1<<6)
+#define	MAP_MARKERS     (1<<7)
+#define	CACHE           (1<<8)
+
+#define MARGIN_NONE	-1
+#define MARGIN_BOTTOM	0		/* x */
+#define MARGIN_LEFT	1 		/* y */
+#define MARGIN_TOP	2		/* x2 */
+#define MARGIN_RIGHT	3		/* y2 */
+
+#define LineIsDashed(d) ((d).values[0] != 0)
+
+namespace Blt {
+  class Graph;
+
+  typedef struct {
+    double x;
+    double y;
+  } Point2d;
+
+  typedef struct {
+    Point2d p;
+    Point2d q;
+  } Segment2d;
+
+  typedef struct {
+    double left;
+    double right;
+    double top;
+    double bottom;
+  } Region2d;
+
+  typedef enum {
+    CID_NONE, CID_AXIS_X, CID_AXIS_Y, CID_ELEM_BAR, CID_ELEM_LINE,
+    CID_MARKER_BITMAP, CID_MARKER_IMAGE, CID_MARKER_LINE, CID_MARKER_POLYGON,
+    CID_MARKER_TEXT
+  } ClassId;
+
+  typedef struct {
+    unsigned char values[12];
+    int offset;
+  } Dashes;
+
+  extern char* dupstr(const char*);
+  extern Graph* getGraphFromWindowData(Tk_Window tkwin);
+
+  extern int pointInPolygon(Point2d *samplePtr, Point2d *screenPts, 
+			    int nScreenPts);
+  extern int polyRectClip(Region2d *extsPtr, Point2d *inputPts,
+			  int nInputPts, Point2d *outputPts);
+  extern int lineRectClip(Region2d *regionPtr, Point2d *p, Point2d *q);
+  extern Point2d getProjection (int x, int y, Point2d *p, Point2d *q);
+};
+
+#endif