init Files

libraries/lvgl/examples/widgets/arc/lv_example_arc_1.c

@@ -0,0 +1,35 @@
+#include "../../lv_examples.h"
+
+#if LV_USE_ARC && LV_BUILD_EXAMPLES
+
+static void value_changed_event_cb(lv_event_t * e);
+
+void lv_example_arc_1(void)
+{
+    lv_obj_t * label = lv_label_create(lv_screen_active());
+
+    /*Create an Arc*/
+    lv_obj_t * arc = lv_arc_create(lv_screen_active());
+    lv_obj_set_size(arc, 150, 150);
+    lv_arc_set_rotation(arc, 135);
+    lv_arc_set_bg_angles(arc, 0, 270);
+    lv_arc_set_value(arc, 10);
+    lv_obj_center(arc);
+    lv_obj_add_event_cb(arc, value_changed_event_cb, LV_EVENT_VALUE_CHANGED, label);
+
+    /*Manually update the label for the first time*/
+    lv_obj_send_event(arc, LV_EVENT_VALUE_CHANGED, NULL);
+}
+
+static void value_changed_event_cb(lv_event_t * e)
+{
+    lv_obj_t * arc = lv_event_get_target(e);
+    lv_obj_t * label = lv_event_get_user_data(e);
+
+    lv_label_set_text_fmt(label, "%" LV_PRId32 "%%", lv_arc_get_value(arc));
+
+    /*Rotate the label to the current position of the arc*/
+    lv_arc_rotate_obj_to_angle(arc, label, 25);
+}
+
+#endif