[chronojump] ForceSensor, graph vert AB lines, shown AB instead of triangle

[Xavier de Blas <xaviblas src gnome org>]

commit 27f57a6e71bfb70a3539e64c465d44d24d02bcdb
Author: Xavier de Blas <xaviblas gmail com>
Date:   Thu Jul 16 17:26:29 2020 +0200

    ForceSensor, graph vert AB lines, shown AB instead of triangle

 src/gui/cairo/util.cs | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)
---
diff --git a/src/gui/cairo/util.cs b/src/gui/cairo/util.cs
index 343be8d5..49cbc333 100644
--- a/src/gui/cairo/util.cs
+++ b/src/gui/cairo/util.cs
@@ -26,6 +26,8 @@ using Gdk;
 
 public static class CairoUtil
 {
+       const int textHeight = 12;
+
        /*
         * public methods
         */
@@ -65,11 +67,11 @@ public static class CairoUtil
                //add rectangle
                g.SetSourceRGBA(0.906, 0.745, 0.098, 1); //Chronojump yellow
 
-               paintVerticalLine(g, xposA, height);
+               paintVerticalLine(g, xposA, height, "A");
 
                if(posBuse && xposA != xposB)
                {
-                       paintVerticalLine(g, xposB, height);
+                       paintVerticalLine(g, xposB, height, "B");
 
                        //g.SetSourceRGBA(0.906, 0.745, 0.098, .5); //Chronojump yellow, half transp
                        g.SetSourceRGBA(0.9, 0.9, 0.01, .33); //More yellow and very transp
@@ -85,19 +87,23 @@ public static class CairoUtil
                }
        }
 
-       private static void paintVerticalLine (Cairo.Context g, int x, int height)
+       private static void paintVerticalLine (Cairo.Context g, int x, int height, string letter)
        {
                //vertical line
                g.MoveTo(x, 9);
                g.LineTo(x, height);
                g.Stroke();
 
-               //top triangle
+               /*
+               //show top triangle
                g.MoveTo(x -4, 0);
                g.LineTo(x   , 8);
                g.LineTo(x +4, 0);
                g.LineTo(x -4, 0);
                g.Fill();
+               */
+               //show letter
+               printText(x, 2, 0, textHeight, letter, g, true);
 
                /*
                //bottom triangle currently not drawn because bottom space changes and half of triangle is 
not shown
@@ -107,4 +113,16 @@ public static class CairoUtil
                */
        }
 
+       private static void printText (int x, int y, int height, int textHeight, string text, Cairo.Context 
g, bool centered)
+       {
+               int moveToLeft = 0;
+               if(centered)
+               {
+                       Cairo.TextExtents te;
+                       te = g.TextExtents(text);
+                       moveToLeft = Convert.ToInt32(te.Width/2);
+               }
+               g.MoveTo( x - moveToLeft, ((y+y+height)/2) + textHeight/2 );
+               g.ShowText(text);
+       }
 }