Matplotlib backend fix for contour calc

ocsmesh/geom/raster.py

@@ -4,6 +4,8 @@
 import os
 from typing import Union, Optional
 
+import matplotlib
+matplotlib.use('Agg')
 import matplotlib.pyplot as plt
 from matplotlib.axes import Axes
 from shapely.geometry import MultiPolygon

ocsmesh/mesh/mesh.py

@@ -22,6 +22,8 @@
 import pandas as pd
 import geopandas as gpd
 from jigsawpy import jigsaw_msh_t, savemsh, loadmsh, savevtk
+import matplotlib
+matplotlib.use('Agg')
 from matplotlib.path import Path
 from matplotlib.transforms import Bbox
 from matplotlib.tri import Triangulation

ocsmesh/raster.py

@@ -25,6 +25,8 @@
     from typing_extensions import Literal
 
 import geopandas as gpd
+import matplotlib
+matplotlib.use('Agg')
 import matplotlib.pyplot as plt
 from matplotlib.cm import ScalarMappable
 from matplotlib.transforms import Bbox

ocsmesh/utils.py

@@ -7,6 +7,8 @@
 
 import jigsawpy
 from jigsawpy import jigsaw_msh_t  # type: ignore[import]
+import matplotlib
+matplotlib.use('Agg')
 from matplotlib.path import Path  # type: ignore[import]
 import matplotlib.pyplot as plt  # type: ignore[import]
 from matplotlib.tri import Triangulation  # type: ignore[import]