[chronojump] Prettier AB lines/rectangle on encoder analyze instant

[Xavier de Blas <xaviblas src gnome org>]

commit 9d2aca738b8132433205553e74ff5cf27aee51fb
Author: Xavier de Blas <xaviblas gmail com>
Date:   Fri Feb 16 00:37:46 2018 +0100

    Prettier AB lines/rectangle on encoder analyze instant

 src/gui/encoder.cs |   43 +++++++++++++++++++++++++++++++++++++------
 1 files changed, 37 insertions(+), 6 deletions(-)
---
diff --git a/src/gui/encoder.cs b/src/gui/encoder.cs
index 1606fd9..593a585 100644
--- a/src/gui/encoder.cs
+++ b/src/gui/encoder.cs
@@ -6198,16 +6198,25 @@ public partial class ChronoJumpWindow
                        g.SetSourceRGBA(0.906, 0.745, 0.098, 1); //Chronojump yellow
                        
                        int xposa = 
eai.GetVerticalLinePosition(Convert.ToInt32(hscale_encoder_analyze_a.Value));
-                       g.MoveTo(xposa, 0);
-                       g.LineTo(xposa, drawingarea_encoder_analyze_cairo_pixbuf.Height);
-               
+                       encoderAnalyzeInstantVerticalLine(g, xposa);
+
                        if(checkbutton_encoder_analyze_b.Active) {
                                int xposb = 
eai.GetVerticalLinePosition(Convert.ToInt32(hscale_encoder_analyze_b.Value));
 
                                if(xposb != xposa) {
+                                       //draw b vertical line
+                                       encoderAnalyzeInstantVerticalLine(g, xposb);
+
                                        g.SetSourceRGBA(0.906, 0.745, 0.098, .5); //Chronojump yellow, half 
transp
-                                       g.Rectangle(xposa ,0, xposb-xposa, 
drawingarea_encoder_analyze_cairo_pixbuf.Height);
-                                       g.Fill();
+
+                                       //create rectangle
+                                       int min = Math.Min(xposa, xposb) +1;
+                                       int max = Math.Max(xposa, xposb) -1;
+                                       if(min < max)
+                                       {
+                                               g.Rectangle(min ,9 , max-min, 
drawingarea_encoder_analyze_cairo_pixbuf.Height -18);
+                                               g.Fill();
+                                       }
                                }
                        }
                        
@@ -6216,7 +6225,29 @@ public partial class ChronoJumpWindow
                        g.GetTarget ().Dispose ();
                }
        }
-       
+
+       private void encoderAnalyzeInstantVerticalLine(Cairo.Context g, int x)
+       {
+               //vertical line
+               g.MoveTo(x, 9);
+               g.LineTo(x, drawingarea_encoder_analyze_cairo_pixbuf.Height);
+               g.Stroke();
+
+               //top triangle
+               g.MoveTo(x -4, 0);
+               g.LineTo(x   , 8);
+               g.LineTo(x +4, 0);
+               g.LineTo(x -4, 0);
+               g.Fill();
+
+               /*
+               //bottom triangle currently not drawn because bottom space changes and half of triangle is 
not shown
+               g.MoveTo(x -4, drawingarea_encoder_analyze_cairo_pixbuf.Height);
+               g.LineTo(x   , drawingarea_encoder_analyze_cairo_pixbuf.Height -8);
+               g.LineTo(x +4, drawingarea_encoder_analyze_cairo_pixbuf.Height);
+               */
+       }
+
        // -------------- end of drawingarea_encoder_analyze_instant