Move PlotOptions class out of TagPlot into its own module.

plotoptions.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""Contains the PlotOption class."""
+
+
+class PlotOptions:
+    """
+    Container objects which include all plot options provided by plotid.
+
+    Methods
+    -------
+    __init__figs : figure object
+        Figure that will be tagged.
+    prefix : str
+        Prefix that is placed before the ID.
+    id_method : int
+        Method that decides which method is used to generate the ID.
+    rotation : int
+        Rotation angle for the ID.
+    position : tuple
+        Relative position of the ID on the plot (x,y).
+    """
+
+    def __init__(self, figs, prefix, id_method, rotation, position):
+
+        self.figs = figs
+        self.prefix = prefix
+        self.id_method = id_method
+        self.rotation = rotation
+        self.position = position

tagplot_matplotlib.py

@@ -9,6 +9,7 @@ Functions:
 import matplotlib
 import matplotlib.pyplot as plt
 import create_id
+from plotoptions import PlotOptions
 
 
 def tagplot_matplotlib(plotid_object):
@@ -19,6 +20,10 @@ def tagplot_matplotlib(plotid_object):
     as Tag (Property of figure).
     TagPlot can tag multiple figures at once
     """
+    # Check if plotid_object is a valid instance of PlotOptions
+    if not isinstance(plotid_object, PlotOptions):
+        raise TypeError('The given options container is not an instance'
+                        'of PlotOptions.')
     # Check if figs is a valid figure or a list of valid figures
     if isinstance(plotid_object.figs, matplotlib.figure.Figure):
         pass

tests/test_tagplot_matplotlib.py

@@ -52,6 +52,10 @@ class Test_tagplot_matplotlib(unittest.TestCase):
         with self.assertRaises(TypeError):
             tagplot_matplotlib(options)
 
+    def test_mpl_plotoptions(self):
+        with self.assertRaises(TypeError):
+            tagplot_matplotlib('wrong_object')
+
 
 if __name__ == '__main__':
     unittest.main()