Make time optional for Trackers

Assets/UXF/Scripts/Etc/Tracker.cs

@@ -12,7 +12,7 @@ namespace UXF
     /// </summary>
     public abstract class Tracker : MonoBehaviour
     {
-        private static string[] baseHeaders = new string[] { "time" };
+        private static string[] baseHeaders = new string[] { };
         private TrackerState currentState = TrackerState.Stopped;
 
         /// <summary>
@@ -87,7 +87,6 @@ public void RecordRow()
                 "Tracker measurements cannot be taken when not recording!");
 
             UXFDataRow newRow = GetCurrentValues();
-            newRow.Add(("time", Time.time));
             Data.AddCompleteRow(newRow);
         }
 

Assets/UXF/Scripts/Trackers/MouseScreenTracker.cs

@@ -10,21 +10,24 @@ namespace UXF
     public class MouseScreenTracker : Tracker
     {
         public override string MeasurementDescriptor => "mouse_screen";
-        public override IEnumerable<string> CustomHeader => new string[] { "pix_x", "pix_y" };
+        public override IEnumerable<string> CustomHeader => new string[] { "time", "pix_x", "pix_y" };
 
         /// <summary>
         /// Returns current mouse position in screen coordinates
         /// </summary>
         /// <returns></returns>
         protected override UXFDataRow GetCurrentValues()
         {
+            float time = Time.time;
+
             // get position and rotation
             Vector2 p = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
 
 
             // return position, rotation (x, y, z) as an array
             var values = new UXFDataRow()
             {
+                ("time", time),
                 ("pix_x", p.x),
                 ("pix_y", p.y)
             };

Assets/UXF/Scripts/Trackers/MouseWorldTracker.cs

@@ -16,20 +16,23 @@ public class MouseWorldTracker : Tracker
 
         public override string MeasurementDescriptor => "mouse_world";
 
-        public override IEnumerable<string> CustomHeader => new string[] { "pos_x", "pos_y", "pos_z", };
+        public override IEnumerable<string> CustomHeader => new string[] { "time", "pos_x", "pos_y", "pos_z", };
 
         /// <summary>
         /// Returns current mouse position in world coordinates
         /// </summary>
         /// <returns></returns>
         protected override UXFDataRow GetCurrentValues()
         {
+            float time = Time.time;
+
             // get position and rotation
             Vector3 p = mainCamera.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, distanceFromCamera));
 
             // return position, rotation (x, y, z) as an array
             var values = new UXFDataRow()
             {
+                ("time", time),
                 ("pos_x", p.x),
                 ("pos_y", p.y),
                 ("pos_z", p.z)

Assets/UXF/Scripts/Trackers/PositionRotationTracker.cs

@@ -12,21 +12,24 @@ namespace UXF
     public class PositionRotationTracker : Tracker
     {
         public override string MeasurementDescriptor => "movement";
-        public override IEnumerable<string> CustomHeader => new string[] { "pos_x", "pos_y", "pos_z", "rot_x", "rot_y", "rot_z" };
+        public override IEnumerable<string> CustomHeader => new string[] { "time", "pos_x", "pos_y", "pos_z", "rot_x", "rot_y", "rot_z" };
 
         /// <summary>
         /// Returns current position and rotation values
         /// </summary>
         /// <returns></returns>
         protected override UXFDataRow GetCurrentValues()
         {
+            float time = Time.time;
+
             // get position and rotation
             Vector3 p = gameObject.transform.position;
             Vector3 r = gameObject.transform.eulerAngles;
 
             // return position, rotation (x, y, z) as an array
             var values = new UXFDataRow()
             {
+                ("time", time),
                 ("pos_x", p.x),
                 ("pos_y", p.y),
                 ("pos_z", p.z),