Document all of the methods in the interface

astrowidgets/interface_definition.py

@@ -45,34 +45,110 @@ class ImageViewerInterface(Protocol):
     # Methods for loading data
     @abstractmethod
     def load_fits(self, file):
+        """
+        Load a FITS file into the viewer.
+
+        Parameters
+        ----------
+        file : str or `astropy.io.fits.HDU`
+            The FITS file to load. If a string, it can be a URL or a
+            file path.
+        """
         raise NotImplementedError
 
     @abstractmethod
     def load_array(self, array):
+        """
+        Load a 2D array into the viewer.
+
+        Parameters
+        ----------
+        array : array-like
+            The array to load.
+        """
         raise NotImplementedError
 
     @abstractmethod
     def load_nddata(self, data):
+        """
+        Load an `astropy.nddata.NDData` object into the viewer.
+
+        Parameters
+        ----------
+        data : `astropy.nddata.NDData`
+            The NDData object to load.
+        """
         raise NotImplementedError
 
     # Saving contents of the view and accessing the view
     @abstractmethod
     def save(self, filename):
+        """
+        Save the current view to a file.
+
+        Parameters
+        ----------
+        filename : str
+            The file to save to. The format is determined by the
+            extension.
+        """
         raise NotImplementedError
 
     # Marker-related methods
     @abstractmethod
     def start_marking(self, marker_name=None):
+        """
+        Start interactive marking of points on the image.
+
+        Parameters
+        ----------
+        marker_name : str, optional
+            The name of the marker set to use. If not given, a unique
+            name will be generated.
+        """
         raise NotImplementedError
 
     @abstractmethod
     def stop_marking(self, clear_markers=False):
+        """
+        Stop interactive marking of points on the image.
+
+        Parameters
+        ----------
+        clear_markers : bool, optional
+            If `True`, clear the markers that were created during
+            interactive marking. Default is `False`.
+        """
         raise NotImplementedError
 
     @abstractmethod
     def add_markers(self, table, x_colname='x', y_colname='y',
                     skycoord_colname='coord', use_skycoord=False,
                     marker_name=None):
+        """
+        Add markers to the image.
+
+        Parameters
+        ----------
+        table : `astropy.table.Table`
+            The table containing the marker positions.
+        x_colname : str, optional
+            The name of the column containing the x positions. Default
+            is ``'x'``.
+        y_colname : str, optional
+            The name of the column containing the y positions. Default
+            is ``'y'``.
+        skycoord_colname : str, optional
+            The name of the column containing the sky coordinates. If
+            given, the ``use_skycoord`` parameter is ignored. Default
+            is ``'coord'``.
+        use_skycoord : bool, optional
+            If `True`, the ``skycoord_colname`` column will be used to
+            get the marker positions. Default is `False`.
+        marker_name : str, optional
+            The name of the marker set to use. If not given, a unique
+            name will be generated.
+        """
         raise NotImplementedError
 
     # @abstractmethod
@@ -81,6 +157,9 @@ def add_markers(self, table, x_colname='x', y_colname='y',
 
     @abstractmethod
     def reset_markers(self):
+        """
+        Remove all markers from the image.
+        """
         raise NotImplementedError
 
     # @abstractmethod
@@ -89,6 +168,15 @@ def reset_markers(self):
 
     @abstractmethod
     def remove_markers(self, marker_name=None):
+        """
+        Remove markers from the image.
+
+        Parameters
+        ----------
+        marker_name : str, optional
+            The name of the marker set to remove. If not given, all
+            markers will be removed.
+        """
         raise NotImplementedError
 
     # @abstractmethod
@@ -99,17 +187,69 @@ def remove_markers(self, marker_name=None):
     def get_markers(self, x_colname='x', y_colname='y',
                     skycoord_colname='coord',
                     marker_name=None):
+        """
+        Get the marker positions.
+
+        Parameters
+        ----------
+        x_colname : str, optional
+            The name of the column containing the x positions. Default
+            is ``'x'``.
+        y_colname : str, optional
+            The name of the column containing the y positions. Default
+            is ``'y'``.
+        skycoord_colname : str, optional
+            The name of the column containing the sky coordinates. Default
+            is ``'coord'``.
+        marker_name : str, optional
+            The name of the marker set to use. If not given, all
+            markers will be returned.
+
+        Returns
+        -------
+        table : `astropy.table.Table`
+            The table containing the marker positions.
+        """
         raise NotImplementedError
 
     # Methods that modify the view
     @abstractmethod
-    def center_on(self):
+    def center_on(self, point):
+        """
+        Center the view on the point.
+
+        Parameters
+        ----------
+        tuple or `~astropy.coordinates.SkyCoord`
+            If tuple of ``(X, Y)`` is given, it is assumed
+            to be in data coordinates.
+        """
         raise NotImplementedError
 
     @abstractmethod
-    def offset_by(self):
+    def offset_by(self, dx, dy):
+        """
+        Move the center to a point that is given offset
+        away from the current center.
+
+        Parameters
+        ----------
+        dx, dy : float or `~astropy.unit.Quantity`
+            Offset value. Without a unit, assumed to be pixel offsets.
+            If a unit is attached, offset by pixel or sky is assumed from
+            the unit.
+        """
         raise NotImplementedError
 
     @abstractmethod
     def zoom(self):
+        """
+        Zoom in or out by the given factor.
+
+        Parameters
+        ----------
+        val : int
+            The zoom level to zoom the image.
+            See `zoom_level`.
+        """
         raise NotImplementedError