QR Codes now work with mpl and image engine.

QR Codes now work with mpl and image engine. But position and other parameters are still hard coded.
Closes #34 (closed)
Follow-up issue for customization: #69 (closed)

plotid/create_id.py

@@ -7,6 +7,7 @@ Functions:
 """
 import time
 import uuid
+import qrcode
 
 
 def create_id(id_method):
@@ -40,3 +41,24 @@ def create_id(id_method):
                 '"time": Unix time converted to hexadecimal\n'
                 '"random": Random UUID')
     return figure_id
+
+
+def create_qrcode(figure_id):
+    """
+    Create a QR Code from an identifier.
+
+    Parameters
+    ----------
+    figure_id : str
+        Identifier which will be embedded in the qrcode.
+
+    Returns
+    -------
+    QR Code as PilImage.
+    """
+    qrc = qrcode.QRCode(version=1, box_size=10, border=0)
+    qrc.add_data(figure_id)
+    qrc.make(fit=True)
+    img = qrc.make_image(fill_color="black", back_color="white")
+
+    return img