[chronojump] Cairo bars, doing result value font size appropriate

[Xavier de Blas <xaviblas src gnome org>]

commit 81252cb856ac281603a9a0deae03049c979943d0
Author: Xavier de Blas <xaviblas gmail com>
Date:   Tue Aug 24 13:47:27 2021 +0200

    Cairo bars, doing result value font size appropriate

 src/gui/cairo/bars.cs | 52 ++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 45 insertions(+), 7 deletions(-)
---
diff --git a/src/gui/cairo/bars.cs b/src/gui/cairo/bars.cs
index b4eadc04b..2a4c235c8 100644
--- a/src/gui/cairo/bars.cs
+++ b/src/gui/cairo/bars.cs
@@ -226,10 +226,43 @@ public abstract class CairoBars : CairoGeneric
                return arr[minp];
        }
 
-       protected void plotResultOnBar(double x, double y, double alto, double result)
+       //TODO: at the moment we are not lowering decs, make resultsFontHeight and decs global variables
+       protected int getBarsResultFontHeight (double maxWidth)
        {
+               int decs = 2; //can be 1 if need more space
+               double maxLengthNumber = 9.99;
+               if(maxY >= 10)
+                       maxLengthNumber = 99.99;
+               if(maxY >= 100)
+                       maxLengthNumber = 999.99;
+               if(maxY >= 1000)
+                       maxLengthNumber = 9999.99;
+
                Cairo.TextExtents te;
-               te = g.TextExtents(Util.TrimDecimals(result,2));
+               te = g.TextExtents(Util.TrimDecimals(maxLengthNumber, decs));
+
+               //fix if label is wider than bar
+               int optimalFontHeight = textHeight;
+               for(int i = textHeight; te.Width >= maxWidth && i > 0; i --)
+               {
+                       //if(i <= 8)
+                       //      decs = 1;
+
+                       g.SetFontSize(i);
+                       te = g.TextExtents(Util.TrimDecimals(maxLengthNumber, decs));
+                       optimalFontHeight = textHeight;
+               }
+
+               return optimalFontHeight;
+       }
+
+       protected void plotResultOnBar(double x, double y, double alto, double result, int resultFontHeight)
+       {
+               int decs = 2; //can be 1 if need more space
+
+               g.SetFontSize(resultFontHeight);
+               Cairo.TextExtents te;
+               te = g.TextExtents(Util.TrimDecimals(result,decs));
 
                bool textAboveBar = true;
                /*
@@ -261,7 +294,10 @@ public abstract class CairoBars : CairoGeneric
                //write text
                g.Color = black;
                printText(x, yStart+te.Height/2, 0, Convert.ToInt32(te.Height),
-                       Util.TrimDecimals(result, 2), g, alignTypes.CENTER);
+                       Util.TrimDecimals(result, decs), g, alignTypes.CENTER);
+
+               //put font size to default value again
+               g.SetFontSize(textHeight);
        }
 
        protected void writeTitleAtTop()
@@ -346,6 +382,7 @@ public class CairoBars1Series : CairoBars
 
                 double barWidth = Convert.ToInt32(.5*distanceBetweenCols);
                 double barDesplLeft = Convert.ToInt32(.5*barWidth);
+               int resultFontHeight = getBarsResultFontHeight (barWidth*1.5);
 
                for(int i = 0; i < point_l.Count; i ++)
                {
@@ -356,7 +393,7 @@ public class CairoBars1Series : CairoBars
 
                        drawRoundedRectangle (true, x, y, barWidth, graphHeight -y -outerMargins, 4, g, 
colorSerie1);
 
-                       plotResultOnBar(x + barWidth/2, y, graphHeight -outerMargins, p.Y);
+                       plotResultOnBar(x + barWidth/2, y, graphHeight -outerMargins, p.Y, resultFontHeight);
 
                        //print the type at bottom
                        printText(x + barWidth/2, graphHeight -outerMargins + textHeight/2, 0, textHeight,
@@ -446,10 +483,11 @@ public class CairoBars2HSeries : CairoBars
                 //calculate separation between series and bar width
                 double distanceBetweenCols = (graphWidth - 2*outerMargins)/maxX;
 
-                double barWidth = .35*distanceBetweenCols;
+                double barWidth = .4*distanceBetweenCols;
                 double barDesplLeft = .5*barWidth;
                //double valueABSep = barWidth / 4.0;
                double valueABSep = 0;
+               int resultFontHeight = getBarsResultFontHeight (barWidth*1.5);
 
                for(int i = 0; i < pointA_l.Count; i ++)
                {
@@ -463,7 +501,7 @@ public class CairoBars2HSeries : CairoBars
                        double y = calculatePaintY(p.Y);
 
                        drawRoundedRectangle (true, x, y, barWidth, graphHeight -y -outerMargins, 4, g, 
colorSerie1);
-                       plotResultOnBar(x + barWidth/2, y, graphHeight -outerMargins, p.Y);
+                       plotResultOnBar(x + barWidth/2, y, graphHeight -outerMargins, p.Y, resultFontHeight);
 
                        //print the type at bottom
                        printText(x + barWidth + valueABSep/2, graphHeight -outerMargins + textHeight/2, 0, 
textHeight,
@@ -479,7 +517,7 @@ public class CairoBars2HSeries : CairoBars
                        y = calculatePaintY(p.Y);
 
                        drawRoundedRectangle (true, x, y, barWidth, graphHeight -y - outerMargins, 4, g, 
colorSerie2);
-                       plotResultOnBar(x + barWidth/2, y, graphHeight -outerMargins, p.Y);
+                       plotResultOnBar(x + barWidth/2, y, graphHeight -outerMargins, p.Y, resultFontHeight);
                }
        }