feat: Add optional graphical target and rework graphics backend selection

doc/changelog.d/3820.fixed.md

@@ -0,0 +1 @@
+fix: Optional graphics dependency

pyproject.toml

@@ -18,10 +18,8 @@ dependencies = [
     "ansys-math-core>=0.1.2",
     "ansys-platform-instancemanagement~=1.0",
     "ansys-tools-path>=0.3.1",
-    "ansys-tools-visualization-interface>=0.2.6",
     "click>=8.1.3", # for CLI interface
     "grpcio>=1.30.0",  # tested up to grpcio==1.35
-    "matplotlib>=3.0.0",  # for colormaps for pyvista
     "numpy>=1.14.0,<3.0.0",
     "pexpect>=4.8.0 ; platform_system=='Linux'",
     "platformdirs>=3.6.0",
@@ -53,6 +51,18 @@ jupyter = [
     "ipywidgets",
 ]
 
+graphics = [
+    "ansys-tools-visualization-interface>=0.2.6",
+    "matplotlib>=3.0.0",  # for colormaps for pyvista
+]
+
+all = [
+    "ansys-tools-visualization-interface>=0.2.6",
+    "matplotlib>=3.0.0",  # for colormaps for pyvista
+    "jupyterlab>=3",
+    "ipywidgets",
+]
+
 tests = [
     "ansys-dpf-core==0.10.1",
     "ansys-tools-visualization-interface==0.8.3",

src/ansys/mapdl/core/__init__.py

@@ -73,7 +73,9 @@
 _HAS_PYVISTA: bool = is_installed("pyvista")
 _HAS_REQUESTS: bool = is_installed("requests")
 _HAS_TQDM: bool = is_installed("tqdm")
-_HAS_VISUALIZER: bool = is_installed("ansys.tools.visualization_interface")
+_HAS_VISUALIZER: bool = is_installed(
+    "ansys.tools.visualization_interface"
+) and is_installed("matplotlib")
 
 
 # Setup directories