[chronojump] jumpsWeightFVProfile.cs with arrow to show what to develop, ...

[Xavier de Blas <xaviblas src gnome org>]

commit 4592a4906caf64b8a8ae39d40fbc6b2c2b9ca3cc
Author: Xavier de Blas <xaviblas gmail com>
Date:   Wed Jul 29 13:19:40 2020 +0200

    jumpsWeightFVProfile.cs with arrow to show what to develop, ...

 src/gui/cairo/jumpsWeightFVProfile.cs | 41 ++++++++++++++++++---------
 src/gui/cairo/xy.cs                   | 53 ++++++++++++++++++++++++++++++++++-
 2 files changed, 80 insertions(+), 14 deletions(-)
---
diff --git a/src/gui/cairo/jumpsWeightFVProfile.cs b/src/gui/cairo/jumpsWeightFVProfile.cs
index 41407f12..be3fcddf 100644
--- a/src/gui/cairo/jumpsWeightFVProfile.cs
+++ b/src/gui/cairo/jumpsWeightFVProfile.cs
@@ -37,13 +37,14 @@ public class JumpsWeightFVProfileGraph : CairoXY
        private ErrorAtStart errorMessage;
 
        //constructor when there are no points
-       public JumpsWeightFVProfileGraph (DrawingArea area, ErrorAtStart error)//, string title, string 
jumpType, string date)
+       public JumpsWeightFVProfileGraph (DrawingArea area, ErrorAtStart errorMessage)//, string title, 
string jumpType, string date)
        {
                this.area = area;
+               this.errorMessage = errorMessage;
 
                initGraph();
 
-               plotError(error);
+               plotError();
 
                endGraph();
        }
@@ -98,22 +99,22 @@ public class JumpsWeightFVProfileGraph : CairoXY
                LogB.Information(string.Format("Imbalance: {0}", imbalance));
        }
 
-       private void plotError(ErrorAtStart error)
+       private void plotError()
        {
                string message = "";
-               if(error == ErrorAtStart.NEEDLEGPARAMS)
+               if(errorMessage == ErrorAtStart.NEEDLEGPARAMS)
                        message = "Need to fill person's leg parameters.";
-               else if(error == ErrorAtStart.BADLEGPARAMS)
+               else if(errorMessage == ErrorAtStart.BADLEGPARAMS)
                        message = "Person's leg parameters are incorrect.";
-               else if(error == ErrorAtStart.NEEDJUMPS)
+               else if(errorMessage == ErrorAtStart.NEEDJUMPS)
                        message = "Need to execute jumps SJl and/or SJ.";
-               else if(error == ErrorAtStart.NEEDJUMPSX)
+               else if(errorMessage == ErrorAtStart.NEEDJUMPSX)
                        message = "Need to execute jumps with different weights.";
-               else if(error == ErrorAtStart.F0ANDV0NOTPOSITIVE)
+               else if(errorMessage == ErrorAtStart.F0ANDV0NOTPOSITIVE)
                        message = "F0 and V0 are not > 0.";
-               else if(error == ErrorAtStart.F0NOTPOSITIVE)
+               else if(errorMessage == ErrorAtStart.F0NOTPOSITIVE)
                        message = "F0 is not > 0.";
-               else if(error == ErrorAtStart.V0NOTPOSITIVE)
+               else if(errorMessage == ErrorAtStart.V0NOTPOSITIVE)
                        message = "V0 is not > 0.";
 
                g.SetFontSize(16);
@@ -138,14 +139,25 @@ public class JumpsWeightFVProfileGraph : CairoXY
                else
                        plotPredictedLine(predictedLineTypes.STRAIGHT, predictedLineCrossMargins.DONOTTOUCH);
 
-               plotAlternativeLineWithRealPoints (0, f0Opt, v0Opt, 0, showFullGraph);
+               if(errorMessage == ErrorAtStart.ALLOK)
+               {
+                       plotAlternativeLineWithRealPoints (0, f0Opt, v0Opt, 0, showFullGraph);
+
+                       if(showFullGraph)
+                       {
+                               if(f0Opt > f0Rel)
+                                       plotArrow (0, f0Rel, 0, f0Opt, false, 12);
+                               if(v0Opt > v0)
+                                       plotArrow (v0, 0, v0Opt, 0, true, 12);
+                       }
+               }
 
                plotRealPoints();
 
                writeTitle();
 
                if(errorMessage != ErrorAtStart.ALLOK)
-                       plotError(errorMessage);
+                       plotError();
 
                endGraph();
        }
@@ -165,11 +177,14 @@ public class JumpsWeightFVProfileGraph : CairoXY
 
                writeTextAtRight(ypos++, "Samozino & col. 2008-13:", false);
                writeTextAtRight(ypos++, string.Format("- Profile (90º): {0} %", Math.Round(fvprofile90,0)), 
false);
+               writeTextAtRight(ypos++, string.Format("- Imbalance: {0} %", imbalance), false);
+
+               g.Color = red;
                if(needDevelopForce)
                        writeTextAtRight(ypos++, "- Need to develop force", false);
                else
                        writeTextAtRight(ypos++, "- Need to develop speed", false);
-               writeTextAtRight(ypos++, string.Format("- Imbalance: {0} %", imbalance), false);
+               g.SetSourceRGB(0, 0, 0);
        }
 
        protected override void writeSelectedValues(int line, PointF pClosest)
diff --git a/src/gui/cairo/xy.cs b/src/gui/cairo/xy.cs
index 449bf6e2..5324c2ac 100644
--- a/src/gui/cairo/xy.cs
+++ b/src/gui/cairo/xy.cs
@@ -70,7 +70,7 @@ public abstract class CairoXY
 
        Cairo.Color black;
        Cairo.Color white;
-       Cairo.Color red;
+       protected Cairo.Color red;
        Cairo.Color blue;
        protected Cairo.Color bluePlots;
 
@@ -173,6 +173,57 @@ public abstract class CairoXY
                g.SetSourceRGB(0,0,0);
        }
 
+       //horiz or vertical to manage spacement of arrow points and tip draw
+       protected void plotArrow (double ax, double ay, double bx, double by, bool horiz, int spacement)
+       {
+               // 1) convert to graph coordinates
+               ax = calculatePaintX(ax);
+               ay = calculatePaintY(ay);
+               bx = calculatePaintX(bx);
+               by = calculatePaintY(by);
+
+               // 2) have spacements
+               if(horiz) {
+                       ax += spacement;
+                       bx -= spacement;
+               } else {
+                       ay -= spacement;
+                       by += spacement;
+               }
+               g.SetSourceRGB(255,0,0);
+
+               // 3) write line (if it fits)
+               if(horiz && bx > ax || ! horiz && ay > by)
+               {
+                       g.MoveTo(ax, ay);
+                       g.LineTo(bx, by);
+               } else {
+                       //if it does not fit, move bx or by to have the arrow at the middle
+                       if(horiz)
+                               bx = Convert.ToInt32((ax + bx) / 2);
+                       else
+                               by = Convert.ToInt32((ay + by) / 2);
+                       g.MoveTo(bx, by);
+               }
+
+               // 4) write arrow tip
+
+               int tip = 5;
+               if(horiz) {
+                       g.LineTo(bx - tip, by - tip);
+                       g.MoveTo(bx, by);
+                       g.LineTo(bx - tip, by + tip);
+               } else {
+                       g.LineTo(bx - tip, by + tip);
+                       g.MoveTo(bx, by);
+                       g.LineTo(bx + tip, by + tip);
+               }
+
+               // 5) end
+               g.Stroke ();
+               g.SetSourceRGB(0,0,0);
+       }
+
        protected virtual void separateMinXMaxXIfNeeded()
        {
                if(minX == maxX)