[chronojump] Fixed force on extra weight jumps on jumpsWeightFVProfile

[Xavier de Blas <xaviblas src gnome org>]

commit 2a43bed9e62c7047bde2023207e15d1026737d19
Author: Xavier de Blas <xaviblas gmail com>
Date:   Tue Jul 21 18:16:29 2020 +0200

    Fixed force on extra weight jumps on jumpsWeightFVProfile

 src/jumpsWeightFVProfile.cs | 6 +++++-
 src/util.cs                 | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/src/jumpsWeightFVProfile.cs b/src/jumpsWeightFVProfile.cs
index d4d3a2bb..bd6ccdb6 100644
--- a/src/jumpsWeightFVProfile.cs
+++ b/src/jumpsWeightFVProfile.cs
@@ -25,6 +25,8 @@ public class JumpsWeightFVProfile
 {
        private List<PointF> point_l;
        LeastSquaresLine ls;
+       private double hp0; //meters
+       private double g = 9.81;
 
        //constructor
        public JumpsWeightFVProfile()
@@ -33,6 +35,8 @@ public class JumpsWeightFVProfile
        
        public void Calculate (int personID, int sessionID, double personWeight, double trochanterToe, double 
trochanterFloorOnFlexion)
        {
+               hp0 = (trochanterToe - trochanterFloorOnFlexion) / 100.0;
+
                //1 get data
                 List<Jump> jump_l = SqliteJump.SelectJumpsWeightFVProfile (personID, sessionID, false); 
//TODO:true);
 
@@ -51,7 +55,7 @@ public class JumpsWeightFVProfile
                        //Samozino formula is F = m*g*( (h/hp0) +1)
                        //h is jump's height
                        //hp0 = trochanterToe - trochanterFloorOnFlexion
-                       double force = (personWeight + j.Weight) * 9.81 * ( ( 
Util.GetHeightInCentimeters(j.Tv) / (trochanterToe - trochanterFloorOnFlexion) ) + 1 );
+                       double force = (personWeight + (personWeight * j.Weight / 100.0)) * 9.81 * ( ( 
Util.GetHeightInMeters(j.Tv) / hp0 ) + 1 );
 
                        point_l.Add(new PointF(
                                                Util.GetInitialSpeed(j.Tv, true), //TODO: pass 
preferences.metersSecondsPreferred and show it on graph label
diff --git a/src/util.cs b/src/util.cs
index e5fb6a2b..30773a93 100644
--- a/src/util.cs
+++ b/src/util.cs
@@ -472,9 +472,13 @@ public class Util
        }
        //new code (2019 ...) sends and returns doubles
        public static double GetHeightInCentimeters (double tv) {
-               // s = 4.9 * (tv/2)^2
+               // s = 100 * 4.9 * (tv/2)^2
                return 100 * 4.9 * Math.Pow( tv / 2.0 , 2 );
        }
+       public static double GetHeightInMeters (double tv) {
+               // s = 4.9 * (tv/2)^2
+               return 4.9 * Math.Pow( tv / 2.0 , 2 );
+       }
        
        public static double WeightFromKgToPercent (double jumpKg, double personKg) {
                return (double) jumpKg *100 / (double) personKg;