update asserts

examples/widgets/meter/lv_example_meter_1.c

@@ -0,0 +1,54 @@
+#include "../../../lvgl.h"
+#include <stdio.h>
+#if LV_USE_METER
+
+static lv_obj_t * meter;
+
+static void set_value(lv_meter_indicator_t * indic, int32_t v)
+{
+    lv_meter_set_indicator_value(meter, indic, v);
+}
+
+/**
+ * A simple meter
+ */
+void lv_example_meter_1(void)
+{
+     meter = lv_meter_create(lv_scr_act(), NULL);
+    lv_obj_align(meter, NULL, LV_ALIGN_CENTER, 0, 0);
+
+    /*Add a scale first*/
+    lv_meter_scale_t * scale = lv_meter_add_scale(meter);
+    lv_meter_set_scale_ticks(meter, scale, 51, 2, 10, LV_COLOR_GRAY);
+    lv_meter_set_scale_major_ticks(meter, scale, 10, 4, 15, LV_COLOR_BLACK, 10);
+
+    lv_meter_indicator_t * indic;
+
+    /*Add a red arc to the end */
+    indic = lv_meter_add_arc(meter, scale, 3, LV_COLOR_RED, 1);
+    lv_meter_set_indicator_start_value(meter, indic, 80);
+    lv_meter_set_indicator_end_value(meter, indic, 100);
+
+    /*Make the tick lines red at the end of the scale*/
+    indic = lv_meter_add_scale_lines(meter, scale, LV_COLOR_RED, LV_COLOR_RED, false, 0);
+    lv_meter_set_indicator_start_value(meter, indic, 80);
+    lv_meter_set_indicator_end_value(meter, indic, 100);
+
+    /*Add a needle line indicator*/
+    indic = lv_meter_add_needle_line(meter, scale, 4, LV_COLOR_GRAY, -10);
+
+    /*Create an animation to set the value*/
+    lv_anim_t a;
+    lv_anim_init(&a);
+    lv_anim_set_exec_cb(&a, (lv_anim_exec_xcb_t) set_value);
+    lv_anim_set_var(&a, indic);
+    lv_anim_set_values(&a, 0, 100);
+    lv_anim_set_time(&a, 2000);
+    lv_anim_set_repeat_delay(&a, 100);
+    lv_anim_set_playback_time(&a, 500);
+    lv_anim_set_playback_delay(&a, 100);
+    lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);
+    lv_anim_start(&a);
+}
+
+#endif