Fix plot_world crash with matplotlib 3.6+ and bump version to 1.2.2

Replace deprecated fig.gca(projection='3d') with fig.add_subplot(111, projection='3d'),
add regression test, and update release workflow to auto-publish on version bump.

Closes #100

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: kozo2

.github/workflows/release.yml

@@ -1,23 +1,41 @@
 name: Upload Python Package
 
 on:
-  release:
-    types: [created]
+  push:
+    branches: [master]
+    paths:
+      - 'setup.py'
 
 jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
+    - name: Check version bump
+      id: version_check
+      run: |
+        NEW_VERSION=$(python -c "import re; print(re.search(r\"version='([^']+)'\", open('setup.py').read()).group(1))")
+        echo "version=$NEW_VERSION" >> "$GITHUB_OUTPUT"
+        pip install ecell4 2>/dev/null && \
+          CURRENT_VERSION=$(pip show ecell4 | grep ^Version | awk '{print $2}') || \
+          CURRENT_VERSION="0.0.0"
+        if [ "$NEW_VERSION" = "$CURRENT_VERSION" ]; then
+          echo "changed=false" >> "$GITHUB_OUTPUT"
+        else
+          echo "changed=true" >> "$GITHUB_OUTPUT"
+        fi
     - name: Set up Python
-      uses: actions/setup-python@v1
+      if: steps.version_check.outputs.changed == 'true'
+      uses: actions/setup-python@v5
       with:
         python-version: '3.x'
     - name: Install dependencies
+      if: steps.version_check.outputs.changed == 'true'
       run: |
         python -m pip install --upgrade pip
         pip install setuptools wheel twine
     - name: Build and publish
+      if: steps.version_check.outputs.changed == 'true'
       env:
         TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
         TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}

.gitignore

@@ -7,3 +7,7 @@ docs/build
 .cache/
 .idea/
 .pytest_cache/
+*.h5
+.claude/
+tutorial*.py
+tutorial*.ipynb

ecell4/__init__.py

@@ -1,3 +1,3 @@
 from ecell4.util import *
 
-__version__ = '1.2.0'
+__version__ = '1.2.2'

ecell4/plotting/_matplotlib.py

@@ -176,7 +176,7 @@ def __prepare_mplot3d_with_matplotlib(
     import matplotlib.pyplot as plt
 
     fig = plt.figure(figsize=(figsize, figsize))
-    ax = fig.gca(projection='3d')
+    ax = fig.add_subplot(111, projection='3d')
 
     if wireframe:
         ax.w_xaxis.set_pane_color((0, 0, 0, 0))

setup.py

@@ -11,7 +11,7 @@
 
 setup(
     name='ecell4',
-    version='1.2.1',
+    version='1.2.2',
     packages=['ecell4', 'ecell4.util', 'ecell4.extra', 'ecell4.datasource', 'ecell4.mca', 'ecell4.plotting'],
     package_data = {"ecell4.util": [
         "templates/init_ipynb.js", "templates/init_cyjs.js", "templates/template.html",

tests/__init__.py

@@ -0,0 +1,18 @@
+"""Regression test for https://github.com/ecell/ecell4/issues/100
+
+fig.gca(projection='3d') was removed in matplotlib 3.6+.
+"""
+import matplotlib
+matplotlib.use('Agg')
+
+import matplotlib.pyplot as plt
+from mpl_toolkits.mplot3d import Axes3D
+from ecell4.plotting._matplotlib import __prepare_mplot3d_with_matplotlib
+
+
+def test_prepare_mplot3d_returns_3d_axes():
+    wrange = {'x': (0, 1), 'y': (0, 1), 'z': (0, 1)}
+    fig, ax = __prepare_mplot3d_with_matplotlib(
+        wrange, figsize=6, grid=True, wireframe=False, angle=None, noaxis=False)
+    assert isinstance(ax, Axes3D)
+    plt.close(fig)