Set matplotlib backend in library, remove from tests

Moved the matplotlib backend configuration to the main library file (matplotlib_chart.py) and removed redundant backend setting from all test files. This centralizes backend setup and simplifies test scripts.

Author: FeodorFitsner

src/flet_charts/matplotlib_chart.py

@@ -8,6 +8,7 @@
 import flet.canvas as fc
 
 try:
+    import matplotlib
     from matplotlib.figure import Figure
 except ImportError as e:
     raise Exception(
@@ -22,6 +23,8 @@
 
 logger = logging.getLogger("flet-charts.matplotlib")
 
+matplotlib.use("module://flet_charts.matplotlib_backends.backend_flet_agg")
+
 figure_cursors = {
     "default": None,
     "pointer": ft.MouseCursor.CLICK,

tests/mpl_v2_3d.py

@@ -1,14 +1,11 @@
 import logging
 
 import flet as ft
-import matplotlib
 import matplotlib.pyplot as plt
 import numpy as np
 
 import flet_charts
 
-matplotlib.use("module://flet_charts.matplotlib_backends.backend_flet_agg")
-
 logging.basicConfig(level=logging.INFO)
 
 

tests/mpl_v2_animate.py

@@ -1,14 +1,11 @@
 import logging
 
 import flet as ft
-import matplotlib
 import matplotlib.pyplot as plt
 import numpy as np
 
 import flet_charts
 
-matplotlib.use("module://flet_charts.matplotlib_backends.backend_flet_agg")
-
 logging.basicConfig(level=logging.INFO)
 
 state = {}

tests/mpl_v2_basic.py

@@ -1,14 +1,11 @@
 import logging
 
 import flet as ft
-import matplotlib
 import matplotlib.pyplot as plt
 import numpy as np
 
 import flet_charts
 
-matplotlib.use("module://flet_charts.matplotlib_backends.backend_flet_agg")
-
 logging.basicConfig(level=logging.INFO)
 
 

tests/mpl_v2_events.py

@@ -1,14 +1,9 @@
 import flet as ft
-import matplotlib
 import matplotlib.pyplot as plt
 import numpy as np
 
 import flet_charts
 
-matplotlib.use("module://flet_charts.matplotlib_backends.backend_flet_agg")
-
-# logging.basicConfig(level=logging.DEBUG)
-
 state = {}