beautified bounding box coordinate output

www/maposmatic/templates/maposmatic/map-full.html

@@ -180,8 +180,13 @@
           <td>{{ map.administrative_city }} ({{ map.administrative_osmid }})</td></tr>
         {% else %}
         <tr><td><strong>{% trans "Bounding box" %}</strong></td>
-          <td>({{ map.lat_upper_left }}, {{ map.lon_upper_left }}) &rarr;
-            ({{ map.lat_bottom_right }}, {{ map.lon_bottom_right }})</td></tr>
+          <td>
+	    {{ map.lat_upper_left|latitude }}, {{ map.lon_upper_left|longitude }}
+	    &rarr;
+            {{ map.lat_bottom_right|latitude }}, {{ map.lon_bottom_right|longitude }}
+	    &nbsp;&nbsp;&nbsp;({{ map|bbox_km }})
+	  </td>
+	</tr>
         {% endif %}
         <tr><td><strong>{% trans "Layout" %}</strong></td>
           <td>{{ map.layout }}</td></tr>

www/maposmatic/templates/maposmatic/maps.html

@@ -54,8 +54,12 @@
             <td>{{ map.administrative_city }} ({{ map.administrative_osmid }})</td>
           {% else %}
             <td><strong>{% trans "Bounding Box" %}</strong></td>
-            <td>({{ map.lat_upper_left|floatformat:3 }}, {{ map.lon_upper_left|floatformat:3 }}) &rarr;
-                ({{ map.lat_bottom_right|floatformat:3 }}, {{ map.lon_bottom_right|floatformat:3 }})</td>
+            <td>
+	      {{ map.lat_upper_left|latitude }}, {{ map.lon_upper_left|longitude }}
+	      &rarr;
+              {{ map.lat_bottom_right|latitude }}, {{ map.lon_bottom_right|longitude }}
+	      &nbsp;&nbsp;&nbsp;({{ map|bbox_km }})
+	    </td>
           {% endif %}
           <td rowspan="0" align="right" width="210">
             {% if map.get_thumbnail %}

www/maposmatic/templatetags/extratags.py

@@ -30,6 +30,8 @@ from django.utils.translation import ugettext_lazy as _
 
 import www.settings
 
+import ocitysmap
+
 register = template.Library()
 
 def job_status_to_str(value, arg, autoescape=None):
@@ -67,9 +69,45 @@ def file_basename(value):
 def add_blank_after_comma(value):
     return value.replace(",",", ")
 
+def _dd2dms(value):
+    degrees  = abs(int(value))
+    minsec   = value - degrees
+    minutes  = int(minsec * 60)
+    seconds  = (minsec % 60) / float(3600)
+
+    return (degrees, minutes, seconds)
+
+def latitude(value):
+    latitude = float(value)
+    (degrees, minutes, seconds) = _dd2dms(latitude)
+    hemisphere = 'N' if latitude >= 0 else 'S'
+
+    return "%d°%d'%d\"%s" % (degrees, minutes, seconds, hemisphere)
+
+def longitude(value):
+    latitude = float(value)
+    (degrees, minutes, seconds) = _dd2dms(latitude)
+    hemisphere = 'E' if latitude >= 0 else 'W'
+
+    return "%d°%d'%d\"%s" % (degrees, minutes, seconds, hemisphere)
+
+def bbox_km(value):
+    boundingbox = ocitysmap.coords.BoundingBox(
+        value.lat_upper_left,
+        value.lon_upper_left,
+        value.lat_bottom_right,
+        value.lon_bottom_right)
+
+    (height, width) = boundingbox.spheric_sizes()
+
+    return "ca. %d x %d km²" % (width/1000, height/1000)
+
 register.filter('job_status_to_str', job_status_to_str)
 register.filter('feedparsed', feedparsed)
 register.filter('abs', lambda x: abs(x))
 register.filter('getitem', lambda d,i: d.get(i,''))
 register.filter('file_basename', file_basename)
 register.filter('add_blank_after_comma', add_blank_after_comma)
+register.filter('latitude', latitude)
+register.filter('longitude', longitude)
+register.filter('bbox_km', bbox_km)