Add vispy test (#17)

.github/workflows/local.yml

@@ -23,6 +23,8 @@ jobs:
             qt: "pyqt5"
           - os: ubuntu-24.04
             qt: "pyqt6"
+          - os: windows-latest
+            qt: "pyqt6"
           - os: ubuntu-latest
             qt: "pyside6"
     runs-on: ${{ matrix.os }}
@@ -48,11 +50,24 @@ jobs:
         if: matrix.qt != ''
         run: |
           set -eo pipefail
-          pip install ${{ matrix.qt }} matplotlib
+          pip install ${{ matrix.qt }} matplotlib qtpy
           QT_DEBUG_PLUGINS=1 LIBGL_DEBUG=verbose python tests/test_qt.py
         shell: bash
       - uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.os }}-${{ matrix.qt }}-cube
           path: ${{ matrix.os }}-${{ matrix.qt }}-cube.png
           if-no-files-found: error
+      - name: Test Vispy Qt
+        if: matrix.qt != ''
+        run: |
+          pip install vispy pillow pyopengl
+          python tests/test_vispy_qt.py
+        env:
+          MATRIX_OS: ${{ matrix.os }}
+          MATRIX_QT: ${{ matrix.qt }}
+      - uses: actions/upload-artifact@v4
+        if: matrix.qt != ''
+        with:
+          name: ${{ matrix.os }}-${{ matrix.qt }}-vispy-volume
+          path: ${{ matrix.os }}-${{ matrix.qt }}-vispy-volume.png

tests/test_qt.py

@@ -4,3 +4,6 @@
 plt.figure()
 backend = matplotlib.get_backend()
 assert backend == 'QtAgg', backend
+
+from qtpy import QtDBus
+_ = QtDBus.QDBusConnection('Name')

tests/test_vispy_qt.py

@@ -0,0 +1,21 @@
+"""Quickly check if vispy off screen plotting works."""
+
+import os
+from pathlib import Path
+import numpy as np
+from qtpy.QtWidgets import QApplication
+from vispy import scene
+from PIL import Image
+
+qapp = QApplication([])
+canvas = scene.SceneCanvas(size=(512, 512))
+view = canvas.central_widget.add_view()
+np.random.seed(0)
+vol_data = np.random.rand(64, 64, 64).astype(np.float32)
+image = scene.visuals.Volume(vol_data, cmap="viridis", parent=view.scene)
+view.camera = scene.ArcballCamera()
+canvas.show()
+
+fname = f'{os.environ['MATRIX_OS']}-{os.environ['MATRIX_QT']}-vispy-volume.png'
+out_path = Path(__file__).parent.parent / fname
+Image.fromarray(canvas.render()).save(out_path)