+ })
+ return context
+
+
+@register.simple_tag()
+def area_thumbnail_url(area, geometry):
+ def to_square(coords):
+ w = coords[1][0] - coords[0][0]
+ h = coords[1][1] - coords[0][1]
+ if w == h:
+ return coords
+ elif w > h:
+ return [[coords[0][0] + w/2 - h/2, coords[0][1]],
+ [coords[1][0] - w/2 + h/2, coords[1][1]]]
+ else:
+ return [[coords[0][0], coords[0][1] + h/2 - w/2],
+ [coords[1][0], coords[1][1] - h/2 + w/2, ]]
+
+ # so much for sorl extensibility. # what to do about this?
+ _engine = sorl.thumbnail.default.engine
+ sorl.thumbnail.default.engine = cropper
+ coords = to_square(area.area)
+
+ try:
+ th = sorl.thumbnail.default.backend.get_thumbnail(
+ area.picture.image_file,
+ geometry,
+ crop="%dpx %dpx %dpx %dpx" % tuple(map(lambda d: max(0, d), tuple(coords[0] + coords[1]))))
+ except Exception, e:
+ logging.exception("Error creating a thumbnail for PictureArea")
+ return ''
+
+ sorl.thumbnail.default.engine = _engine
+
+ return th.url
+
+
+