[chronojump] cairo xy can have a grid of integers

[Xavier de Blas <xaviblas src gnome org>]

commit 369f2dcc0d488f959a7f630d0c57239f3606947e
Author: Xavier de Blas <xaviblas gmail com>
Date:   Thu Aug 6 17:19:58 2020 +0200

    cairo xy can have a grid of integers

 src/gui/cairo/xy.cs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
---
diff --git a/src/gui/cairo/xy.cs b/src/gui/cairo/xy.cs
index c4a5232c..a4d3fab4 100644
--- a/src/gui/cairo/xy.cs
+++ b/src/gui/cairo/xy.cs
@@ -574,6 +574,34 @@ public abstract class CairoXY
                g.Restore();
        }
 
+       //for a grid of integers
+       protected void paintGridInt (double minX, double maxX, double minY, double maxY, int by, gridTypes 
gridType)
+       {
+               g.Save();
+               g.SetDash(new double[]{1, 2}, 0);
+               if(gridType != gridTypes.HORIZONTALLINES)
+                       for(double i = Math.Floor(minX); i <= Math.Ceiling(maxX) ; i += by)
+                       {
+                               int xtemp = Convert.ToInt32(calculatePaintX(i));
+                               if(xtemp <= outerMargins || xtemp >= graphWidth - outerMargins)
+                                       continue;
+
+                               paintVerticalGridLine(xtemp, Util.TrimDecimals(i, 2));
+                       }
+
+               if(gridType != gridTypes.VERTICALLINES)
+                       for(double i = Math.Floor(minX); i <= Math.Ceiling(maxY) ; i += by)
+                       {
+                               int ytemp = Convert.ToInt32(calculatePaintY(i));
+                               if(ytemp <= outerMargins || ytemp >= graphHeight - outerMargins)
+                                       continue;
+
+                               paintHorizontalGridLine(ytemp, Util.TrimDecimals(i, 2));
+                       }
+               g.Stroke ();
+               g.Restore();
+       }
+
        protected void paintHorizontalGridLine(int ytemp, string text)
        {
                g.MoveTo(outerMargins, ytemp);