[chronojump] cairo XY where x is datetime, on click show date in days instead of percentage of year

[Xavier de Blas <xaviblas src gnome org>]

commit 396032c8489c010582543b342f364f73b206ddb9
Author: Xavier de Blas <xaviblas gmail com>
Date:   Fri Sep 23 20:36:54 2022 +0200

    cairo XY where x is datetime, on click show date in days instead of percentage of year

 src/gui/cairo/jumpsRunsEvolution.cs   |  8 ++++++--
 src/gui/cairo/jumpsWeightFVProfile.cs |  2 +-
 src/gui/cairo/xy.cs                   | 34 +++++++++++++++++++++++++++-------
 src/jumpsRunsEvolution.cs             | 10 +++++++++-
 4 files changed, 43 insertions(+), 11 deletions(-)
---
diff --git a/src/gui/cairo/jumpsRunsEvolution.cs b/src/gui/cairo/jumpsRunsEvolution.cs
index 16dbd9d66..d9707bc7b 100644
--- a/src/gui/cairo/jumpsRunsEvolution.cs
+++ b/src/gui/cairo/jumpsRunsEvolution.cs
@@ -143,10 +143,12 @@ public class JumpsEvolutionGraph : EvolutionGraph
 
        //regular constructor
        public JumpsEvolutionGraph (
-                       List<PointF> point_l, double slope, double intercept,
+                       List<PointF> point_l, List<DateTime> dates_l,
+                       double slope, double intercept,
                        DrawingArea area, string title, string jumpType, string date)
        {
                this.point_l = point_l;
+               this.dates_l = dates_l;
                this.slope = slope;
                this.intercept = intercept;
                this.area = area;
@@ -193,11 +195,13 @@ public class RunsEvolutionGraph : EvolutionGraph
 
        //regular constructor
        public RunsEvolutionGraph (
-                       List<PointF> point_l, double slope, double intercept,
+                       List<PointF> point_l, List<DateTime> dates_l,
+                       double slope, double intercept,
                        DrawingArea area, string title, string runType, string date,
                        bool showTime, bool metersSecondsPreferred)
        {
                this.point_l = point_l;
+               this.dates_l = dates_l;
                this.slope = slope;
                this.intercept = intercept;
                this.area = area;
diff --git a/src/gui/cairo/jumpsWeightFVProfile.cs b/src/gui/cairo/jumpsWeightFVProfile.cs
index 8bc20ed5f..61320cd74 100644
--- a/src/gui/cairo/jumpsWeightFVProfile.cs
+++ b/src/gui/cairo/jumpsWeightFVProfile.cs
@@ -218,7 +218,7 @@ public class JumpsWeightFVProfileGraph : CairoXY
                                        ), false);
        }
 
-       protected override void writeSelectedValues(int line, PointF pClosest)
+       protected override void writeSelectedValues (int line, PointF pClosest, int closestPos)
        {
                g.SelectFontFace(font, Cairo.FontSlant.Normal, Cairo.FontWeight.Normal);
                g.SetFontSize(textHeight);
diff --git a/src/gui/cairo/xy.cs b/src/gui/cairo/xy.cs
index 24f232565..ef0d94354 100644
--- a/src/gui/cairo/xy.cs
+++ b/src/gui/cairo/xy.cs
@@ -29,6 +29,7 @@ public abstract class CairoXY : CairoGeneric
 {
        //used on construction
        protected List<PointF> point_l;
+       protected List<DateTime> dates_l; //used on button press to know day date instead of date as double
        protected bool predictedPointDone;
 
        //regression line straight
@@ -570,6 +571,7 @@ public abstract class CairoXY : CairoGeneric
                        g.SelectFontFace(font, Cairo.FontSlant.Normal, Cairo.FontWeight.Normal);
        }
 
+       protected PointF pClosest;
        protected void writeCoordinatesOfMouseClick (double graphX, double graphY, double realX, double realY)
        {
                int line = 4;
@@ -589,11 +591,11 @@ public abstract class CairoXY : CairoGeneric
 
                LogB.Information("calling findClosestGraphPoint ...");
                // 2) find closest point (including predicted point if any)
-               PointF pClosest = findClosestGraphPoint(graphX, graphY);
+               int closestPos = findClosestGraphPointPos (graphX, graphY);
 
                LogB.Information("writeSelectedValues ...");
                // 3) write text at right
-               writeSelectedValues(line, pClosest);
+               writeSelectedValues (line, pClosest, closestPos);
 
                LogB.Information("painting rectangle ...");
                // 4) paint rectangle around that point
@@ -608,10 +610,14 @@ public abstract class CairoXY : CairoGeneric
         * using graphPoints and not real points because X and Y scale can be very different
         * and this would be stranger for user to have a point selected far away to the "graph" closest point
         */
-       private PointF findClosestGraphPoint(double graphX, double graphY)
+       //return the position in point_l, -1 if predicted is used
+       //the position is useful for jumpsRunsEvolution and asymmetry to know the real date on date_l
+       private int findClosestGraphPointPos (double graphX, double graphY)
        {
                double distMin = 10000000;
-               PointF pClosest = point_l[0];
+               pClosest = point_l[0];
+               int count = 0;
+               int found = 0;
                foreach(PointF p in point_l)
                {
                        double dist = Math.Sqrt(Math.Pow(graphX - calculatePaintX(p.X), 2) + Math.Pow(graphY 
- calculatePaintY(p.Y), 2));
@@ -619,17 +625,22 @@ public abstract class CairoXY : CairoGeneric
                        {
                                distMin = dist;
                                pClosest = p;
+                               found = count;
                        }
+                       count ++;
                }
 
                //also check predicted point if exists
                if(predictedPointDone && Math.Sqrt(Math.Pow(graphX - calculatePaintX(xAtMMaxY), 2) + 
Math.Pow(graphY - calculatePaintY(yAtMMaxY), 2)) < distMin)
+               {
                        pClosest = new PointF(xAtMMaxY, yAtMMaxY);
+                       return -1;
+               }
 
-               return pClosest;
+               return found;
        }
 
-       protected virtual void writeSelectedValues(int line, PointF pClosest)
+       protected virtual void writeSelectedValues(int line, PointF pClosest, int closestPos)
        {
                g.SelectFontFace(font, Cairo.FontSlant.Normal, Cairo.FontWeight.Normal);
                g.SetFontSize(textHeight);
@@ -638,10 +649,19 @@ public abstract class CairoXY : CairoGeneric
                writeTextAtRight(line, Catalog.GetString("Selected") + ":", false);
                g.SetSourceRGB(0, 0, 0);
 
-               writeTextAtRight(line +1, string.Format("- {0}: {1} {2}", xVariable, 
Util.TrimDecimals(pClosest.X, 2), xUnits), false);
+               if (closestPos >= 0 && dates_l != null && dates_l.Count > 0 && closestPos < dates_l.Count)
+                       writeTextAtRight(line +1, string.Format("- {0}: {1} {2}", xVariable, printXDateTime 
(dates_l[closestPos]), xUnits), false);
+               else
+                       writeTextAtRight(line +1, string.Format("- {0}: {1} {2}", xVariable, 
Util.TrimDecimals(pClosest.X, 2), xUnits), false);
+
                writeTextAtRight(line +2, string.Format("- {0}: {1} {2}", yVariable, 
Util.TrimDecimals(pClosest.Y, 2), yUnits), false);
        }
 
+       //on jumpsAsymmetry is overrided and only prints time
+       protected virtual string printXDateTime (DateTime dt)
+       {
+               return (dt.ToString ());
+       }
 
        protected override double calculatePaintX (double realX)
        {
diff --git a/src/jumpsRunsEvolution.cs b/src/jumpsRunsEvolution.cs
index 67fdd9dc1..d0f928aec 100644
--- a/src/jumpsRunsEvolution.cs
+++ b/src/jumpsRunsEvolution.cs
@@ -15,7 +15,7 @@
  *  along with this program; if not, write to the Free Software
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
- *  Copyright (C) 2019-2021   Xavier de Blas <xaviblas gmail com>
+ *  Copyright (C) 2019-2022   Xavier de Blas <xaviblas gmail com>
  */
 
 using System;
@@ -26,6 +26,7 @@ using System.Collections.Generic; //List
 public abstract class JumpsRunsEvolution
 {
        protected List<PointF> point_l;
+       protected List<DateTime> dates_l; //used on button press to know day date instead of date as double
        protected LeastSquaresLine ls;
 
        public abstract void Calculate(int personID, string type, bool onlyBestInSession);
@@ -56,6 +57,10 @@ public abstract class JumpsRunsEvolution
        {
                get { return point_l; }
        }
+       public List<DateTime> Dates_l
+       {
+               get { return dates_l; }
+       }
 
        public double Slope
        {
@@ -82,6 +87,7 @@ public class JumpsEvolution : JumpsRunsEvolution
 
                //2 convert to list of PointF
                point_l = new List<PointF>();
+               dates_l = new List<DateTime>();
                int currentSession = -1;
                 foreach(Jump j in jump_l)
                {
@@ -98,6 +104,7 @@ public class JumpsEvolution : JumpsRunsEvolution
                        double dtDouble = UtilDate.DateTimeYearDayAsDouble(dt);
 
                        point_l.Add(new PointF(dtDouble, Util.GetHeightInCentimeters(j.Tv)));
+                       dates_l.Add(dt);
                }
 
                getLeastSquaresLine ();
@@ -172,6 +179,7 @@ public class RunsEvolution : JumpsRunsEvolution
                                r.MetersSecondsPreferred = metersSecondsPreferred;
                                point_l.Add(new PointF(dtDouble, r.Speed));
                        }
+                       dates_l.Add(dt);
                }
 
                distance_l = Util.SortDoublesListString(distance_l);