Merge db91572 into 79cc8df

regions/core/core.py

@@ -6,7 +6,7 @@
 
 from astropy.extern import six
 
-__all__ = ['Region', 'PixelRegion', 'SkyRegion']
+__all__ = ['Region', 'PixelRegion', 'SkyRegion', 'RegionMeta', 'RegionVisual']
 
 
 """
@@ -291,3 +291,46 @@ def to_pixel(self, wcs):
             The world coordinate system transformation to assume
         """
         raise NotImplementedError
+
+
+class RegionMeta(dict):
+    """
+    A python dictionary subclass which holds the meta attributes of the region.
+    """
+    valid_keys = ['label', 'symbol', 'include', 'frame', 'range', 'veltype', 'restfreq', 'tag', 'comment', 'coord',
+                  'line', 'name', 'select', 'highlite', 'fixed', 'edit', 'move', 'rotate', 'delete', 'source', 'background',
+                  ]
+
+    key_mapping = {'point': 'symbol', 'text': 'label'}
+
+    def __setitem__(self, key, value):
+        key = self.key_mapping.get(key, key)
+        if key in self.valid_keys:
+            super().__setitem__(key, value)
+        else:
+            raise KeyError("{} is not a valid meta key for region.".format(key))
+
+    def __getitem__(self, item):
+        item = self.key_mapping.get(item, item)
+        return super().__getitem__(item)
+
+
+class RegionVisual(dict):
+    """
+    A python dictionary subclass which holds the visual attributes of the region.
+    """
+    valid_keys = ['color', 'dash', 'font', 'dashlist', 'symsize', 'symthick', 'fontsize', 'fontstyle', 'usetex',
+                  'labelpos', 'labeloff', 'linewidth', 'linestyle', 'fill', 'line']
+
+    key_mapping = {'width': 'linewidth'}
+
+    def __setitem__(self, key, value):
+        key = self.key_mapping.get(key, key)
+        if key in self.valid_keys :
+            super().__setitem__(key, value)
+        else:
+            raise KeyError("{} is not a valid visual meta key for region.".format(key))
+
+    def __getitem__(self, item):
+        item = self.key_mapping.get(item, item)
+        return super().__getitem__(item)