lvgl/examples/widgets/meter/lv_example_meter_4.c

#include "../../lv_examples.h"
#if LV_USE_METER && LV_BUILD_EXAMPLES

/**
 * Create a pie chart
 */
void lv_example_meter_4(void)
{
    lv_obj_t * meter = lv_meter_create(lv_scr_act());
    lv_obj_center(meter);

    /*Remove the background and the circle from the middle*/
    lv_obj_remove_style(meter, NULL, LV_PART_MAIN);
    lv_obj_remove_style(meter, NULL, LV_PART_INDICATOR);

    /*Add a scale first with no ticks.*/
    lv_meter_scale_t * scale = lv_meter_add_scale(meter);
    lv_meter_set_scale_ticks(meter, scale, 0, 0, 0, lv_color_black());
    lv_meter_set_scale_range(meter, scale, 0, 100, 360, 0);

    /*Add a three arc indicator*/
    lv_coord_t indic_w = lv_obj_get_width(meter) / 2;
    lv_meter_indicator_t * indic1 = lv_meter_add_arc(meter, scale, indic_w, lv_color_orange(), 0);
    lv_meter_set_indicator_start_value(meter, indic1, 0);
    lv_meter_set_indicator_end_value(meter, indic1, 40);

    lv_meter_indicator_t * indic2 = lv_meter_add_arc(meter, scale, indic_w, lv_color_yellow(), 0);
    lv_meter_set_indicator_start_value(meter, indic2, 40);  /*Start from the previous*/
    lv_meter_set_indicator_end_value(meter, indic2, 80);

    lv_meter_indicator_t * indic3 = lv_meter_add_arc(meter, scale, indic_w, lv_color_deep_orange(), 0);
    lv_meter_set_indicator_start_value(meter, indic3, 80);  /*Start from the previous*/
    lv_meter_set_indicator_end_value(meter, indic3, 100);
}

#endif