2-12、arc

static void arc_loader(lv_task_t* t)
{
    static int16_t a = 0;
    a += 5;
    lv_arc_set_end_angle(t->user_data, a);
    if (a >= 360) {
        a = 0;
    }
}
void lv_ex_get_started_2(void)
{
    lv_obj_t* arc = lv_arc_create(lv_scr_act(), NULL);
    // 设置背景圆弧
    lv_arc_set_bg_angles(arc, 0, 360);
    // 设置进度圆弧
    lv_arc_set_start_angle(arc, 0);
    lv_arc_set_end_angle(arc, 0);
    lv_obj_set_size(arc, 150, 150);
    lv_obj_align(arc, NULL, LV_ALIGN_CENTER, 0, 0);
    lv_task_create(arc_loader, 20, LV_TASK_PRIO_LOWEST, arc);
}

• 圆弧颜色

    // 圆弧背景色
    style = &state->style_bg;
    if (lv_style_init(style))
    {
        lv_style_set_bg_opa(style, LV_STATE_DEFAULT, LV_OPA_TRANSP);
        lv_style_set_outline_width(style, LV_STATE_DEFAULT, 0);
        lv_style_set_border_width(style, LV_STATE_DEFAULT, 0);
        lv_style_set_line_color(style, LV_STATE_DEFAULT, lv_color_hex(0x444444));
        lv_style_set_line_width(style, LV_STATE_DEFAULT, 13);
        lv_style_set_pad_all(style, LV_STATE_DEFAULT, 0);
    }
  
    // 圆弧进度颜色
    style = &state->style_arc;
    if (lv_style_init(style))
    {
        lv_style_set_pad_all(style, LV_STATE_DEFAULT, 0);
        lv_style_set_bg_color(style, LV_STATE_DEFAULT, lv_color_hex(0xEC9709));
        lv_style_set_line_width(style, LV_STATE_DEFAULT, 13);
        lv_style_set_line_color(style, LV_STATE_DEFAULT, lv_color_hex(0xEC9709));
    }
  
    // 圆弧
    lv_obj_t *arc = lv_arc_create(content_obj, NULL);
    lv_obj_set_size(arc, 110, 110);
    lv_arc_set_bg_angles(arc, 0, 360);
    lv_arc_set_angles(arc, 0, 90);
    lv_obj_add_style(arc, LV_ARC_PART_BG, &state->style_bg);
    lv_obj_add_style(arc, LV_ARC_PART_INDIC, &state->style_arc);