first commit

libraries/lvgl/examples/widgets/arc/lv_example_arc_2.py

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+#
+# An `lv_timer` to call periodically to set the angles of the arc
+#
+class ArcLoader():
+    def __init__(self):
+        self.a = 270
+
+    def arc_loader_cb(self,tim,arc):
+        # print(tim,arc)
+        self.a += 5
+
+        arc.set_end_angle(self.a)
+
+        if self.a >= 270 + 360:
+            tim._del()
+
+
+#
+# Create an arc which acts as a loader.
+#
+
+# Create an Arc
+arc = lv.arc(lv.scr_act())
+arc.set_bg_angles(0, 360)
+arc.set_angles(270, 270)
+arc.center()
+
+# create the loader
+arc_loader = ArcLoader()
+
+# Create an `lv_timer` to update the arc.
+
+timer = lv.timer_create_basic()
+timer.set_period(20)
+timer.set_cb(lambda src: arc_loader.arc_loader_cb(timer,arc))
+
+