Extend tikz node at

examples/tikzcp.py

@@ -0,0 +1,53 @@
+#!/usr/bin/python
+"""
+This example shows TikZ drawing capabilities overlaying the current page.
+
+..  :copyright: (c) 2021 by Antonio Cervone
+    :license: MIT, see License for more details.
+"""
+
+# begin-doc-include
+from pylatex import (
+    Document,
+    TikZ,
+    TikZNode,
+    TikZNodeAnchor,
+    TikZOptions,
+)
+
+if __name__ == "__main__":
+
+    # create document
+    doc = Document()
+
+    # options for the tikzpicture environment
+    tikz_opts = TikZOptions("remember picture", "overlay")
+
+    # add our sample drawings
+    with doc.create(TikZ(options=tikz_opts)) as pic:
+
+        # create an anchor to the page center
+        page_center = TikZNodeAnchor("current page", "center")
+
+        # create a node on the center of the page
+        centerbox = TikZNode(
+            text="this is the center",
+            at=page_center,
+            options=TikZOptions("draw"),
+        )
+
+        # add to tikzpicture
+        pic.append(centerbox)
+
+        # create an anchor to the page center
+        page_top = TikZNodeAnchor("current page", "north")
+
+        # create a node at the top of the page
+        topbox = TikZNode(
+            text="this is the top", at=page_top, options=({"anchor": "north"})
+        )
+
+        # add to tikzpicture
+        pic.append(topbox)
+
+    doc.generate_pdf("tikzcp", clean_tex=False)

pylatex/tikz.py

@@ -199,7 +199,7 @@ def dumps(self):
 class TikZNode(TikZObject):
     """A class that represents a TiKZ node."""
 
-    _possible_anchors = ['north', 'south', 'east', 'west']
+    _possible_anchors = ['center', 'north', 'south', 'east', 'west', 'north east', 'south east', 'south west', 'north west']
 
     def __init__(self, handle=None, options=None, at=None, text=None):
         """
@@ -209,21 +209,21 @@ def __init__(self, handle=None, options=None, at=None, text=None):
             Node identifier
         options: list
             List of options
-        at: TikZCoordinate
-            Coordinate where node is placed
+        at: TikZCoordinate of TikZNodeAnchor
+            Coordinate or anchor where node is placed
         text: str
             Body text of the node
         """
         super(TikZNode, self).__init__(options=options)
 
         self.handle = handle
 
-        if isinstance(at, (TikZCoordinate, type(None))):
+        if isinstance(at, (TikZCoordinate, TikZNodeAnchor, type(None))):
             self._node_position = at
         else:
             raise TypeError(
                 'at parameter must be an object of the'
-                'TikzCoordinate class')
+                'TikZCoordinate or TikZNodeAnchor class')
 
         self._node_text = text