created docstrings for maphelper

ground_station/resources/core/MapHelper.py

@@ -5,17 +5,37 @@ class MapHelper(object):
 
     @staticmethod
     def new_image(width, height):
+        """
+        Generates a new image using PIL.Image module
+        
+        returns PIL.IMAGE OBJECT
+        """
         return PIL.Image.new('RGBA', (width, height))
 
     @staticmethod
     def fast_round(value, precision):
+        """
+        Function to round values instead of using python's
+
+        return INT
+        """
         return int(value * 10 ** precision) / 10. ** precision
 
     @staticmethod
     def pixels_to_degrees(pixels, zoom):
+        """
+        Generates pixels to be expected at zoom levels
+
+        returns INT
+        """
         return pixels * 2 ** (21-zoom)
 
     @staticmethod
     def pixels_to_meters(latitude, zoom):
+        """
+        Function generates how many pixels per meter it should be from the projecction
+
+        returns FLOAT
+        """
         # https://groups.google.com/forum/#!topic/google-maps-js-api-v3/hDRO4oHVSeM
         return 2 ** zoom / (156543.03392 * math.cos(math.radians(latitude)))