基于 littlevgl 写的模拟时钟源代码

lv_obj_t *gauge_m;
lv_obj_t *gauge_f;
lv_obj_t *gauge_s;

static const lv_color_t colors[] = {//指针颜色
                             LV_COLOR_RED,//时针
                             LV_COLOR_BLUE,//分针
                             LV_COLOR_GREEN//秒针
                             };

//------------------设置时针 不要刻度线------------------
    gauge_s = lv_gauge_create(lv_scr_act(),NULL);
    lv_obj_set_size(gauge_s,100,100);
    lv_obj_align(gauge_s,NULL, LV_ALIGN_CENTER,0,0);

    static lv_style_t gauge_style;//
    lv_style_copy(&gauge_style,gauge_s->style_p);
    gauge_style.body.padding.left = 0;//不要表盘刻度线

    lv_gauge_set_range(gauge_s,0,60);
    lv_gauge_set_scale(gauge_s,360,61,0);
    lv_gauge_set_needle_count(gauge_s,1,&colors[0]);//时针
    lv_gauge_set_style(gauge_s,LV_GAUGE_STYLE_MAIN,&gauge_style);
    //lv_gauge_set_value(gauge_s,0,30);

    //------------------设置分针 不要刻度线------------------
    gauge_f = lv_gauge_create(lv_scr_act(),NULL);
    lv_obj_set_size(gauge_f,140,140);
    lv_obj_align(gauge_f,NULL, LV_ALIGN_CENTER,0,0);

    lv_gauge_set_range(gauge_f,0,60);
    lv_gauge_set_scale(gauge_f,360,61,0);
    lv_gauge_set_needle_count(gauge_f,1,&colors[1]);//分针
    lv_gauge_set_style(gauge_f,LV_GAUGE_STYLE_MAIN,&gauge_style);
    //lv_gauge_set_value(gauge_f,0,35);
    //------------------设置秒针 及60根刻度线------------------
    gauge_m = lv_gauge_create(lv_scr_act(),NULL);
    lv_obj_set_size(gauge_m,180,180);
    lv_obj_align(gauge_m,NULL, LV_ALIGN_CENTER,0,0);

    lv_gauge_set_range(gauge_m,0,60);
    lv_gauge_set_scale(gauge_m,360,61,0);
    lv_gauge_set_needle_count(gauge_m,1,&colors[2]);//秒针
    //lv_gauge_set_value(gauge_m,0,55);

    //-----------------设置外表盘----------------------
    lv_obj_t *arc = lv_arc_create(lv_scr_act(),NULL);
    lv_obj_set_size(arc,190,190);
    lv_obj_align(arc,NULL, LV_ALIGN_CENTER,0,0);
    lv_arc_set_angles(arc, 0, 360);
    //----------------设置宽刻度线-------------------------
    lv_obj_t *lmeter = lv_lmeter_create(lv_scr_act(),NULL);
    lv_obj_set_size(lmeter,180,180);
    lv_obj_align(lmeter,NULL, LV_ALIGN_CENTER,0,0);
    lv_lmeter_set_scale(lmeter,360,13);

    static lv_style_t lmeter_style;//
    lv_style_copy(&lmeter_style,gauge_s->style_p);
    lmeter_style.body.padding.left = 10;
    lmeter_style.line.width = 4;
    lv_lmeter_set_style(lmeter,LV_LMETER_STYLE_MAIN,&lmeter_style);

    set_tim(6,59,45);//设置时间 06:59:45

//------------------------------------------------------------

void set_tim(uint8_t hour,uint8_t min,uint8_t sec)//设置时间
{
  uint8_t min_s = min;

  if(sec < 30) sec += 30;  //加减30是因为仪表盘的0起始线 为30秒钟刻度线
  else sec -= 30;
  lv_gauge_set_value(gauge_m,0,sec);//秒针
  //-----------------------
  if(min < 30) min += 30;
  else min -= 30;
  lv_gauge_set_value(gauge_f,0,min);//分针
  //----------------------
  hour *= 5;
  //分针每走12格 时针走一格
  hour += min_s/12; //分针参数不会等于60
  if(hour < 30) hour += 30;
  else hour -= 30;
  lv_gauge_set_value(gauge_s,0,hour);//时针

}

运行结果（见下图）：与设置时间一致