[chronojump] JumpsDjOptimalFall shows title, date

[Xavier de Blas <xaviblas src gnome org>]

commit dc2a4118b6fe37496f53204b9b4d20377274f044
Author: Xavier de Blas <xaviblas gmail com>
Date:   Fri Dec 27 16:10:49 2019 +0100

    JumpsDjOptimalFall shows title, date

 src/gui/jumpsDjOptimalFall.cs | 34 +++++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 11 deletions(-)
---
diff --git a/src/gui/jumpsDjOptimalFall.cs b/src/gui/jumpsDjOptimalFall.cs
index 25726bcb..af03cb1a 100644
--- a/src/gui/jumpsDjOptimalFall.cs
+++ b/src/gui/jumpsDjOptimalFall.cs
@@ -110,6 +110,7 @@ public class JumpsDjOptimalFallGraph
                } else {
                        writeTextNeed3PointsWithDifferentFall();
                }
+               writeTitle();
 
                endGraph();
        }
@@ -292,29 +293,42 @@ public class JumpsDjOptimalFallGraph
                g.Stroke ();
        }
 
+       private void writeTitle()
+       {
+               writeTextAtRight(-4, title, true);
+               writeTextAtRight(-3, "Optimal fall", false);
+               writeTextAtRight(-2, date, false);
+       }
+
        private void writeTextPredictedPoint()
        {
-               writeTextAtRight(0, "Optimal values:");
-               writeTextAtRight(1, "Fall: " + Util.TrimDecimals(xAtMMaxY, 2) + " cm");
-               writeTextAtRight(2, "Jump height: " + Util.TrimDecimals(yAtMMaxY, 2) + " cm");
+               writeTextAtRight(0, "Optimal values:", false);
+               writeTextAtRight(1, "Fall: " + Util.TrimDecimals(xAtMMaxY, 2) + " cm", false);
+               writeTextAtRight(2, "Jump height: " + Util.TrimDecimals(yAtMMaxY, 2) + " cm", false);
        }
 
        private void writeTextConcaveParabole()
        {
-               writeTextAtRight(0, "Error:");
-               writeTextAtRight(1, "Parabole is concave");
+               writeTextAtRight(0, "Error:", false);
+               writeTextAtRight(1, "Parabole is concave", false);
        }
 
        private void writeTextNeed3PointsWithDifferentFall()
        {
-               writeTextAtRight(0, "Error:");
-               writeTextAtRight(1, "Need at least 3 points");
-               writeTextAtRight(2, "with different falling heights"); //TODO: this will be out of graph
+               writeTextAtRight(0, "Error:", false);
+               writeTextAtRight(1, "Need at least 3 points", false);
+               writeTextAtRight(2, "with different falling heights", false);
        }
 
-       private void writeTextAtRight(int line, string text)
+       private void writeTextAtRight(int line, string text, bool bold)
        {
+               if(bold)
+                       g.SelectFontFace("Helvetica", Cairo.FontSlant.Normal, Cairo.FontWeight.Bold);
+
                printText(graphWidth + Convert.ToInt32(outerMargins/2), Convert.ToInt32(graphHeight/2) + 
textHeight*2*line, 0, textHeight, text, g, false);
+               
+               if(bold)
+                       g.SelectFontFace("Helvetica", Cairo.FontSlant.Normal, Cairo.FontWeight.Normal);
        }
 
        private void endGraph()
@@ -384,13 +398,11 @@ public class JumpsDjOptimalFallGraph
                 return alto - bottomMargin - ((currentValue - minValue) * (alto - topMargin - bottomMargin) 
/ (maxValue - minValue));
         }
 
-       //TODO: inherit this
        private Cairo.Color colorFromRGB(int red, int green, int blue)
        {
                return new Cairo.Color(red/256.0, green/256.0, blue/256.0);
        }
 
-       //TODO: inherit this
        private void printText (int x, int y, int height, int textHeight, string text, Cairo.Context g, bool 
centered)
        {
                int moveToLeft = 0;