[libchamplain] Make set_marker_depth () work correctly for southern hemisphere

[Jiří Techet <jiritechet src gnome org>]

commit 94715cb112af88c4de820771b2864cb9afc0118b
Author: JiÅ?í Techet <techet gmail com>
Date:   Wed Aug 25 22:28:22 2010 +0200

    Make set_marker_depth () work correctly for southern hemisphere
    
    Signed-off-by: JiÅ?í Techet <techet gmail com>

 champlain/champlain-layer.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/champlain/champlain-layer.c b/champlain/champlain-layer.c
index 3229756..909b54d 100644
--- a/champlain/champlain-layer.c
+++ b/champlain/champlain-layer.c
@@ -123,11 +123,13 @@ champlain_layer_init (ChamplainLayer *self)
  * where the most north you are, the farther you are.
  */
 static void
-set_marker_depth(GObject *marker)
+set_marker_depth (GObject *marker)
 {
-  gdouble lat;
+  gdouble lat, z;
+  
   g_object_get (G_OBJECT (marker), "latitude", &lat, NULL);
-  clutter_actor_set_depth(CLUTTER_ACTOR(marker), 90.0 - lat);
+  z = (lat >= 0) ? 90.0 - lat : 90.0 + lat;
+  clutter_actor_set_depth (CLUTTER_ACTOR (marker), z);
 }
 
 
@@ -136,7 +138,7 @@ marker_position_notify (GObject *gobject,
     G_GNUC_UNUSED GParamSpec *pspec,
     gpointer user_data)
 {
-  set_marker_depth(gobject);
+  set_marker_depth (gobject);
 }
 
 
@@ -147,7 +149,7 @@ layer_add_cb (ClutterGroup *layer,
 {
   ChamplainBaseMarker *marker = CHAMPLAIN_BASE_MARKER (actor);
 
-  set_marker_depth(G_OBJECT(actor));
+  set_marker_depth (G_OBJECT(actor));
 
   g_signal_connect (G_OBJECT (marker), "notify::latitude",
       G_CALLBACK (marker_position_notify), layer);