updated docs

docs/docs/algorithms.xml

@@ -51,6 +51,7 @@
                <item>point_rotator</item> 
                <item>get_rect</item> 
                <item>centered_rect</item> 
+               <item>center</item> 
                <item>shrink_rect</item> 
                <item>grow_rect</item> 
                <item>translate_rect</item> 
@@ -777,6 +778,18 @@
                                  
       </component>
 
+   <!-- ************************************************************************* -->
+
+      <component>
+         <name>center</name>
+         <file>dlib/geometry.h</file>
+         <spec_file link="true">dlib/geometry/rectangle_abstract.h</spec_file>
+         <description>        
+            Returns the center point of a <a href="#rectangle">rectangle</a>.
+         </description>
+                                 
+      </component>
+
    <!-- ************************************************************************* -->
 
       <component>

docs/docs/term_index.xml

@@ -22,6 +22,7 @@
          <term file="dlib/geometry/rectangle_abstract.h.html" name="resize_rect_width"/>
          <term file="dlib/geometry/rectangle_abstract.h.html" name="resize_rect_height"/>
          <term file="dlib/geometry/rectangle_abstract.h.html" name="centered_rect"/>
+         <term file="dlib/geometry/rectangle_abstract.h.html" name="center"/>
          <term file="dlib/geometry/rectangle_abstract.h.html" name="nearest_point"/>
          <term file="dlib/geometry/rectangle_abstract.h.html" name="distance_to_rect_edge"/>
          <term file="dlib/geometry/rectangle_abstract.h.html" name="shrink_rect"/>