1 files changed, 29 insertions, 0 deletions
diff --git a/src/bltGraph.h b/src/bltGraph.h
index aaf19e0..f69beae 100644
--- a/src/bltGraph.h
+++ b/src/bltGraph.h
@@ -48,6 +48,33 @@ typedef enum {
 } ClassId;
 
 typedef struct {
+  /* Inputs */
+  int halo;			/* Maximal screen distance a candidate point
+				 * can be from the sample window coordinate */
+
+  int mode;			/* Indicates whether to find the closest data
+				 * point or the closest point on the trace by
+				 * interpolating the line segments.  Can also
+				 * be SEARCH_AUTO, indicating to choose how to
+				 * search.*/
+
+  int x, y;			/* Screen coordinates of test point */
+
+  int along;			/* Indicates to let search run along a
+				 * particular axis: x, y, or both. */
+
+  /* Outputs */
+  Element* elemPtr;		/* Name of the closest element */
+
+  Point2d point;		/* Graph coordinates of closest point */
+
+  int index;			/* Index of closest data point */
+
+  double dist;		/* Distance in screen coordinates */
+
+} ClosestSearch;
+
+typedef struct {
   /* Generic fields common to all graph objects. */
   ClassId classId;		/* Class type of object. */
   const char *name;		/* Identifier to refer the object. */
@@ -373,6 +400,8 @@ struct _Graph {
 					 * ways: aligned, overlap, infront, or
 					 * stacked. */
   int maxBarSetSize;
+
+  ClosestSearch search;
 };
 
 /*