[libchamplain] Add champlain_bounding_box_get_center

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

commit 3f13c52247d57a6cec09fee5411ac03c174be813
Author: Simon Wenner <simon wenner ch>
Date:   Sun Jul 26 23:30:20 2009 +0200

    Add champlain_bounding_box_get_center

 champlain/champlain-bounding-box.c |   19 +++++++++++++++++++
 champlain/champlain-bounding-box.h |    4 ++++
 2 files changed, 23 insertions(+), 0 deletions(-)
---
diff --git a/champlain/champlain-bounding-box.c b/champlain/champlain-bounding-box.c
index 495837b..4cb0d9c 100644
--- a/champlain/champlain-bounding-box.c
+++ b/champlain/champlain-bounding-box.c
@@ -93,3 +93,22 @@ champlain_bounding_box_new ()
 {
   return g_slice_new (ChamplainBoundingBox);
 }
+
+/**
+ * champlain_bounding_box_get_center:
+ * @bbox: a #ChamplainBoundingBox
+ * @lat: the latitude of the box center
+ * @lon: the longitude of the box center
+ *
+ * Since: 0.6
+ */
+void
+champlain_bounding_box_get_center (ChamplainBoundingBox *bbox,
+    gdouble *lat,
+    gdouble *lon)
+{
+  g_return_if_fail (CHAMPLAIN_BOUNDING_BOX (bbox));
+
+  *lat = (bbox->right + bbox->left) / 2.0;
+  *lon = (bbox->top + bbox->bottom) / 2.0;
+}
diff --git a/champlain/champlain-bounding-box.h b/champlain/champlain-bounding-box.h
index 38480da..0d7969c 100644
--- a/champlain/champlain-bounding-box.h
+++ b/champlain/champlain-bounding-box.h
@@ -54,6 +54,10 @@ void champlain_bounding_box_free (ChamplainBoundingBox *bbox);
 
 ChamplainBoundingBox * champlain_bounding_box_new (void);
 
+void champlain_bounding_box_get_center (ChamplainBoundingBox *bbox,
+    gdouble *lat,
+    gdouble *lon);
+
 G_END_DECLS
 
 #endif