[chronojump] Encoder plot bars title autoadjust font size to fit

[Xavier de Blas <xaviblas src gnome org>]

commit eff2adc513b78a14304bfd06dcf4ed34607702d5
Author: Xavier de Blas <xaviblas gmail com>
Date:   Fri Jun 5 11:36:37 2020 +0200

    Encoder plot bars title autoadjust font size to fit

 src/gui/encoderGraphObjects.cs | 35 ++++++++++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 3 deletions(-)
---
diff --git a/src/gui/encoderGraphObjects.cs b/src/gui/encoderGraphObjects.cs
index 4af12ee6..8c6dd6c1 100644
--- a/src/gui/encoderGraphObjects.cs
+++ b/src/gui/encoderGraphObjects.cs
@@ -906,31 +906,60 @@ public class EncoderGraphDoPlot
                int titleFullWidth = 1;
                int titleWidth = 1;
                int lossStringWidth = 1;
+
                layout_encoder_capture_curves_bars_text.SetMarkup(titleFull);
                layout_encoder_capture_curves_bars_text.GetPixelSize(out titleFullWidth, out textHeight);
+
+               // 2) reduce font size title is longer than graphWidth
+               //LogB.Information("font size: " + 
layout_encoder_capture_curves_bars_text.FontDescription.Size.ToString());
+               int savedFontSize = 
Convert.ToInt32(layout_encoder_capture_curves_bars_text.FontDescription.Size / Pango.Scale.PangoScale);
+               if (titleFullWidth > graphWidth)
+               {
+                       int i = 1;
+                       do {
+                               layout_encoder_capture_curves_bars_text.FontDescription.Size -= 
Convert.ToInt32(Pango.Scale.PangoScale);
+
+                               if(layout_encoder_capture_curves_bars_text.FontDescription.Size / 
Pango.Scale.PangoScale < 1)
+                                       break;
+
+                               layout_encoder_capture_curves_bars_text.SetMarkup(titleFull);
+                               layout_encoder_capture_curves_bars_text.GetPixelSize(out titleFullWidth, out 
textHeight);
+
+                               //LogB.Information(string.Format("titleFullWidth: {0}, graphWidth: {1}, i: 
{2}, savedFontSize: {3}, fontSize: {4}",
+                               //                      titleFullWidth, graphWidth, i, savedFontSize,
+                               //                      
layout_encoder_capture_curves_bars_text.FontDescription.Size/Pango.Scale.PangoScale));
+
+                               i ++;
+                       } while (titleFullWidth > graphWidth);
+               }
+
                layout_encoder_capture_curves_bars_text.SetMarkup(title);
                layout_encoder_capture_curves_bars_text.GetPixelSize(out titleWidth, out textHeight);
                layout_encoder_capture_curves_bars_text.SetMarkup(lossString);
                layout_encoder_capture_curves_bars_text.GetPixelSize(out lossStringWidth, out textHeight);
 
-               // 2) paint only title text (with black pen)
+               // 3) paint only title text (with black pen)
                layout_encoder_capture_curves_bars_text.SetMarkup(title);
                pixmap.DrawLayout (pen_black_encoder_capture,
                                Convert.ToInt32( (graphWidth/2) - titleFullWidth/2), 0, //x, y
                                layout_encoder_capture_curves_bars_text);
 
-               // 3) paint loss string
+               // 4) paint loss string
                layout_encoder_capture_curves_bars_text.SetMarkup(lossString);
                pixmap.DrawLayout (pen_gray, //darker than pen_gray_loss
                                Convert.ToInt32( (graphWidth/2) - titleFullWidth/2 + titleWidth), 0, //x, y
                                layout_encoder_capture_curves_bars_text);
 
-               // 3) paint the "]";
+               // 5) paint the "]";
                layout_encoder_capture_curves_bars_text.SetMarkup("]");
                pixmap.DrawLayout (pen_black_encoder_capture,
                                Convert.ToInt32( (graphWidth/2) - titleFullWidth/2 + titleWidth + 
lossStringWidth), 0, //x, y
                                layout_encoder_capture_curves_bars_text);
 
+               // 6) return layout font size to its original value
+               layout_encoder_capture_curves_bars_text.FontDescription.Size = savedFontSize;
+
+
                // <------ end plot title
 
                // paint loss arrow