From f77f14a8ece145faef250dce18134fcf3097c8ff Mon Sep 17 00:00:00 2001
From: mozman <me@mozman.at>
Date: Thu, 4 Jan 2024 06:12:17 +0100
Subject: [PATCH] fixes #1003 - NumpyPath2d could contain a 3d vertex

---
 notes/pages/CHANGELOG.md               |  2 ++
 src/ezdxf/addons/drawing/matplotlib.py |  1 +
 src/ezdxf/npshapes.py                  | 10 ++++++++--
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/notes/pages/CHANGELOG.md b/notes/pages/CHANGELOG.md
index e25dc2426..a12642890 100644
--- a/notes/pages/CHANGELOG.md
+++ b/notes/pages/CHANGELOG.md
@@ -27,6 +27,8 @@ id:: 6588217b-c1d3-44c1-a0d7-e5ee465cc6de
 	- REMOVE: `ezdxf.math.linspace`, replaced by `numpy.linspace`
 	- BUGFIX: Restore lost links between `LAYOUT` and `BLOCK_RECORD` entities
 		- {{issue 997}}
+	- BUGFIX: `NumpyPath2d` could contain a 3d vertex
+		- {{issue 1003}}
 -
 - ## Version 1.1.4 - 2023-12-24
   id:: 6568dc88-ce84-4f46-b490-43768c491a2b
diff --git a/src/ezdxf/addons/drawing/matplotlib.py b/src/ezdxf/addons/drawing/matplotlib.py
index e9e767302..d31405803 100644
--- a/src/ezdxf/addons/drawing/matplotlib.py
+++ b/src/ezdxf/addons/drawing/matplotlib.py
@@ -159,6 +159,7 @@ def draw_path(self, path: BkPath2d, properties: BackendProperties):
         """Draw a solid line path, line type rendering is done by the
         frontend since v0.18.1
         """
+        
         mpl_path = to_matplotlib_path([path])
         try:
             patch = PathPatch(
diff --git a/src/ezdxf/npshapes.py b/src/ezdxf/npshapes.py
index 54115501f..3548b19d3 100644
--- a/src/ezdxf/npshapes.py
+++ b/src/ezdxf/npshapes.py
@@ -152,7 +152,7 @@ def __init__(self, path: Optional[Path]) -> None:
         vertices = [(v.x, v.y) for v in path.control_vertices()]
         if len(vertices) == 0:
             try:  # control_vertices() does not return the start point of empty paths
-                vertices = [path.start]
+                vertices = [Vec2(path.start)]
             except IndexError:
                 vertices = []
         self._vertices = np.array(vertices, dtype=VertexNumpyType)
@@ -503,11 +503,17 @@ def to_matplotlib_path(paths: Iterable[NumpyPath2d], *, detect_holes=False):
     vertices: list[np.ndarray] = []
     codes: list[int] = []
     for path in paths:
+        
         vertices.append(path.np_vertices())
         codes.append(MPL_MOVETO)
         for cmd in path.command_codes():
             codes.extend(MPL_CODES[cmd])
-    return Path(np.concatenate(vertices), codes)
+    points = np.concatenate(vertices)
+    try:
+        return Path(points, codes)
+    except Exception as e:
+        raise ValueError(f"matplotlib.path.Path({str(points)}, {str(codes)}): {str(e)}")
+
 
 
 def single_paths(paths: Iterable[NumpyPath2d]) -> list[NumpyPath2d]: