[sysprof/wip/visualizers] visualizer-ticks: tweak half-line positioning

[Christian Hergert <chergert src gnome org>]

commit 857082b222dc5621c878a475aa449b51f64f2ff4
Author: Christian Hergert <chergert redhat com>
Date:   Tue Sep 27 17:08:52 2016 -0700

    visualizer-ticks: tweak half-line positioning
    
    Just to get things a bit more friendly should we choose even
    line widths.

 lib/sp-visualizer-ticks.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/lib/sp-visualizer-ticks.c b/lib/sp-visualizer-ticks.c
index f5d83cf..794529f 100644
--- a/lib/sp-visualizer-ticks.c
+++ b/lib/sp-visualizer-ticks.c
@@ -86,8 +86,8 @@ draw_ticks (SpVisualizerTicks *self,
 
   for (gdouble x = 0; x < area->width; x += space)
     {
-      cairo_move_to (cr, (gint)x - half, 0);
-      cairo_line_to (cr, (gint)x - half, tick_sizing[ticks].height);
+      cairo_move_to (cr, (gint)x - .5 - (gint)half, 0);
+      cairo_line_to (cr, (gint)x - .5 - (gint)half, tick_sizing[ticks].height);
     }
 
   cairo_set_line_width (cr, tick_sizing[ticks].width);