[libchamplain/libchamplain-0-4] do not emit a notify for lat and lon if the change is too small

[Pierre-Luc Beaudoin <plbeaudoin src gnome org>]

commit ef14ca5f7448366dde169f3648e6b0ce4dc21b25
Author: Pierre-Luc Beaudoin <pierre-luc pierlux com>
Date:   Thu Jan 28 20:09:35 2010 -0500

    do not emit a notify for lat and lon if the change is too small

 NEWS                       |    2 ++
 champlain/champlain-view.c |   15 +++++++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)
---
diff --git a/NEWS b/NEWS
index ec32c43..2669666 100644
--- a/NEWS
+++ b/NEWS
@@ -24,6 +24,8 @@ Fixes:
   Beaudoin)
 * 606393: The display of tiles looks very programmatic, they now load in spiral
   order (Jason Woofenden)
+* Limit the number of times notify::latitude and notify::longitude are emited
+  (Pierre-Luc Beaudoin)
 
 libchamplain 0.4.3 (2010-01-09)
 ===============================
diff --git a/champlain/champlain-view.c b/champlain/champlain-view.c
index b019f47..9e7e2d8 100644
--- a/champlain/champlain-view.c
+++ b/champlain/champlain-view.c
@@ -285,6 +285,7 @@ update_viewport (ChamplainView *view,
     gfloat y)
 {
   ChamplainViewPrivate *priv = view->priv;
+  gfloat lat, lon;
 
   ChamplainFloatPoint old_anchor;
 
@@ -317,11 +318,17 @@ update_viewport (ChamplainView *view,
   update_scale (view);
 
   view_update_polygons (view);
-  priv->longitude = viewport_get_current_longitude (priv);
-  priv->latitude = viewport_get_current_latitude (priv);
+  lon = viewport_get_current_longitude (priv);
+  lat = viewport_get_current_latitude (priv);
 
-  g_object_notify (G_OBJECT (view), "longitude");
-  g_object_notify (G_OBJECT (view), "latitude");
+  priv->longitude = lon;
+  priv->latitude = lat;
+
+  if (fabs (priv->longitude - lon) > 0.001)
+    g_object_notify (G_OBJECT (view), "longitude");
+
+  if (fabs (priv->latitude - lat) > 0.001)
+    g_object_notify (G_OBJECT (view), "latitude");
 }
 
 static void