[libchamplain/wrap] Use gdouble in x_to_wrap_x to avoid precision loss

[Jiří Techet <jiritechet src gnome org>]

commit d5dadc106904da6848a3d3aeb6d05adb4a43dea1
Author: Jiří Techet <techet gmail com>
Date:   Wed Apr 16 00:51:49 2014 +0200

    Use gdouble in x_to_wrap_x to avoid precision loss

 champlain/champlain-view.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/champlain/champlain-view.c b/champlain/champlain-view.c
index aa79622..05c3449 100644
--- a/champlain/champlain-view.c
+++ b/champlain/champlain-view.c
@@ -266,13 +266,13 @@ static ChamplainBoundingBox *get_bounding_box (ChamplainView *view,
     gdouble y);
 
 
-static gint
-x_to_wrap_x (gint x, gint width)
+static gdouble
+x_to_wrap_x (gdouble x, gdouble width)
 {
   if (x < 0)
-    x += (-x / width + 1) * width;
+    x += ((gint)-x / (gint)width + 1) * width;
   
-  return x % width;
+  return fmod (x, width);
 }