fix(arc) minor fixes and example updates

examples/widgets/arc/lv_example_arc_1.c

@@ -6,8 +6,10 @@ void lv_example_arc_1(void)
 {
   /*Create an Arc*/
   lv_obj_t * arc = lv_arc_create(lv_scr_act());
-  lv_arc_set_end_angle(arc, 200);
   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, 40);
   lv_obj_center(arc);
 }
 

examples/widgets/arc/lv_example_arc_2.c

@@ -2,22 +2,9 @@
 
 #if LV_USE_ARC && LV_BUILD_EXAMPLES
 
-/**
- * An `lv_timer` to call periodically to set the angles of the arc
- * @param t
- */
-static void arc_loader(lv_timer_t * t)
+static void set_angle(void * obj, int32_t v)
 {
-    static int16_t a = 270;
-
-    a+=5;
-
-    lv_arc_set_end_angle(t->user_data, a);
-
-    if(a >= 270 + 360) {
-        lv_timer_del(t);
-        return;
-    }
+    lv_arc_set_value(obj, v);
 }
 
 /**
@@ -27,13 +14,24 @@ void lv_example_arc_2(void)
 {
   /*Create an Arc*/
   lv_obj_t * arc = lv_arc_create(lv_scr_act());
+  lv_arc_set_rotation(arc, 270);
   lv_arc_set_bg_angles(arc, 0, 360);
-  lv_arc_set_angles(arc, 270, 270);
+  lv_obj_remove_style(arc, NULL, LV_PART_KNOB);   /*Be sure the knob is not displayed*/
+  lv_obj_clear_flag(arc, LV_OBJ_FLAG_CLICKABLE);  /*To not allow adjusting by click*/
   lv_obj_center(arc);
 
-  /*Create an `lv_timer` to update the arc.
-   *Store the `arc` in the user data*/
-  lv_timer_create(arc_loader, 20, arc);
+  lv_anim_t a;
+  lv_anim_init(&a);
+  lv_anim_set_var(&a, arc);
+  lv_anim_set_exec_cb(&a, set_angle);
+  lv_anim_set_time(&a, 1000);
+  lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);    /*Just for the demo*/
+  lv_anim_set_repeat_delay(&a, 500);
+  lv_anim_set_values(&a, 0, 100);
+  lv_anim_start(&a);
+
+
+
 }
 
 #endif

src/widgets/lv_arc.c

@@ -498,7 +498,7 @@ static void lv_arc_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
    arc->min_value = 0;
    arc->max_value = 100;
    arc->dragging = false;
-   arc->chg_rate = 540;
+   arc->chg_rate = 720;
    arc->last_tick = lv_tick_get();
    arc->last_angle =arc->indic_angle_end;
 
@@ -578,8 +578,8 @@ static void lv_arc_event(const lv_obj_class_t * class_p, lv_event_t * e)
 
         /*Do not allow big jumps.
          *It's mainly to avoid jumping to the opposite end if the "dead" range between min. an max. is crossed.
-         *Check which and was closer on the last valid press (arc->min_close) and prefer that end*/
-        if(LV_ABS(delta_angle) > 180) {
+         *Check which was closer on the last valid press (arc->min_close) and prefer that end*/
+        if(LV_ABS(delta_angle) > 280) {
             if(arc->min_close) angle = 0;
             else angle = deg_range;
         }