[chronojump] RaceAnalyzer speed/time graph shows arrow from maxY to right (speed decrement)

[Xavier de Blas <xaviblas src gnome org>]

commit 893ff5a5d957d4a95e0190e766342d9e7c3631bd
Author: Xavier de Blas <xaviblas gmail com>
Date:   Thu Aug 12 17:58:09 2021 +0200

    RaceAnalyzer speed/time graph shows arrow from maxY to right (speed decrement)

 src/gui/app1/runEncoder.cs    |  6 +++---
 src/gui/cairo/raceAnalyzer.cs | 14 ++++++++++++--
 2 files changed, 15 insertions(+), 5 deletions(-)
---
diff --git a/src/gui/app1/runEncoder.cs b/src/gui/app1/runEncoder.cs
index be9e7a3eb..f349baa26 100644
--- a/src/gui/app1/runEncoder.cs
+++ b/src/gui/app1/runEncoder.cs
@@ -2083,7 +2083,7 @@ public partial class ChronoJumpWindow
                if(cairoGraphRaceAnalyzer_dt == null)
                        cairoGraphRaceAnalyzer_dt = new CairoGraphRaceAnalyzer(
                                        drawingarea_race_analyzer_capture_position_time, "title",
-                                       Catalog.GetString("Distance"), "m");
+                                       Catalog.GetString("Distance"), "m", false);
 
                cairoGraphRaceAnalyzer_dt.DoSendingList (preferences.fontType.ToString(),
                                cairoGraphRaceAnalyzerPoints_dt_l, forceRedraw, 
CairoXY.PlotTypes.POINTSLINES);
@@ -2093,7 +2093,7 @@ public partial class ChronoJumpWindow
                if(cairoGraphRaceAnalyzer_st == null)
                        cairoGraphRaceAnalyzer_st = new CairoGraphRaceAnalyzer(
                                        drawingarea_race_analyzer_capture_speed_time, "title",
-                                       Catalog.GetString("Speed"), "m/s");
+                                       Catalog.GetString("Speed"), "m/s", true);
 
                cairoGraphRaceAnalyzer_st.DoSendingList (preferences.fontType.ToString(),
                                cairoGraphRaceAnalyzerPoints_st_l, forceRedraw, 
CairoXY.PlotTypes.POINTSLINES);
@@ -2106,7 +2106,7 @@ public partial class ChronoJumpWindow
                if(cairoGraphRaceAnalyzer_at == null)
                        cairoGraphRaceAnalyzer_at = new CairoGraphRaceAnalyzer(
                                        drawingarea_race_analyzer_capture_accel_time, "title",
-                                       Catalog.GetString("Accel"), "m/s^2");
+                                       Catalog.GetString("Accel"), "m/s^2", false);
 
                cairoGraphRaceAnalyzer_at.DoSendingList (preferences.fontType.ToString(),
                                cairoGraphRaceAnalyzerPoints_at_l, forceRedraw, CairoXY.PlotTypes.LINES);
diff --git a/src/gui/cairo/raceAnalyzer.cs b/src/gui/cairo/raceAnalyzer.cs
index 679c15bb2..63e5514e2 100644
--- a/src/gui/cairo/raceAnalyzer.cs
+++ b/src/gui/cairo/raceAnalyzer.cs
@@ -28,6 +28,7 @@ using Cairo;
 public class CairoGraphRaceAnalyzer : CairoXY
 {
        int points_list_painted;
+       private bool plotHorizArrowFromMaxY;
 
        /*
        //constructor when there are no points
@@ -50,7 +51,8 @@ public class CairoGraphRaceAnalyzer : CairoXY
        //regular constructor
        public CairoGraphRaceAnalyzer (
                        DrawingArea area, string title,
-                       string yVariable, string yUnits)
+                       string yVariable, string yUnits,
+                       bool plotHorizArrowFromMaxY)
        {
                this.area = area;
                this.title = title;
@@ -60,6 +62,7 @@ public class CairoGraphRaceAnalyzer : CairoXY
                this.yVariable = yVariable;
                xUnits = "s";
                this.yUnits = yUnits;
+               this.plotHorizArrowFromMaxY = plotHorizArrowFromMaxY;
                
 //             doing = false;
                points_list_painted = 0;
@@ -103,9 +106,16 @@ public class CairoGraphRaceAnalyzer : CairoXY
                if( points_list != null &&
                                (maxValuesChanged || forceRedraw || points_list.Count != points_list_painted) 
)
                {
-
                        plotRealPoints(plotType, points_list, points_list_painted);
                        points_list_painted = points_list.Count;
+
+                       if(plotHorizArrowFromMaxY && points_list.Count > 1)
+                       {
+                               MovingAverage mAverage = new MovingAverage(points_list, 5);
+                               mAverage.Calculate();
+                               PointF pMaxY = mAverage.GetMaxY();
+                               plotArrow (pMaxY.X, pMaxY.Y, points_list[points_list.Count -1].X, pMaxY.Y, 
true, 0);
+                       }
                }
 
                if(initGraphDone)