lvgl 7.7.2 arc样式

定义背景样式

     static lv_style_t style_bg;
     lv_style_reset(&style_bg);
     lv_style_init(&style_bg);
     lv_style_set_bg_opa(&style_bg, LV_STATE_DEFAULT, LV_OPA_TRANSP);
     lv_style_set_border_opa(&style_bg, LV_STATE_DEFAULT, LV_OPA_TRANSP);
     lv_style_set_line_color(&style_bg, LV_STATE_DEFAULT, LV_COLOR_MAKE(255, 0, 0));
     lv_style_set_line_width(&style_bg, LV_STATE_DEFAULT, 9);

定义线条样式

     static lv_style_t style_blue;
     lv_style_reset(&style_blue);
     lv_style_init(&style_blue);
     lv_style_set_line_color(&style_blue, LV_STATE_DEFAULT, LV_COLOR_MAKE(0, 0, 255));
     lv_style_set_line_width(&style_blue, LV_STATE_DEFAULT, 9);

绘制并加载黑色屏幕

     lv_obj_t* scr = lv_obj_create(lv_scr_act(), NULL);
     lv_obj_set_size(scr, 390, 390);
     lv_obj_set_style_local_bg_color(scr, LV_OBJ_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_BLACK);
     lv_obj_set_style_local_border_opa(scr, LV_OBJ_PART_MAIN, LV_STATE_DEFAULT, LV_OPA_TRANSP);

绘制ARC

     /*Create an Arc_blue*/
     lv_obj_t* arc_blue = lv_arc_create(scr, NULL);
     lv_obj_add_style(arc_blue, LV_ARC_PART_BG, &style_bg);
     lv_arc_set_bg_angles(arc_blue, 228, 312);					//clear background arc
     lv_obj_set_size(arc_blue, 380, 380);					//set size of weight
     lv_obj_align(arc_blue, NULL, LV_ALIGN_CENTER, 0, 0);
     lv_arc_set_angles(arc_blue, 228, 270);
     lv_obj_add_style(arc_blue, LV_ARC_PART_BG, &style_bg);
     lv_obj_add_style(arc_blue, LV_ARC_PART_INDIC, &style_blue);

完整的绘制ARC样式函数如下

void arc_test(void)
 {
     //background style
     static lv_style_t style_bg;
     lv_style_reset(&style_bg);
     lv_style_init(&style_bg);
     lv_style_set_bg_opa(&style_bg, LV_STATE_DEFAULT, LV_OPA_TRANSP);
     lv_style_set_border_opa(&style_bg, LV_STATE_DEFAULT, LV_OPA_TRANSP);
     lv_style_set_line_color(&style_bg, LV_STATE_DEFAULT, LV_COLOR_MAKE(255, 0, 0));
     lv_style_set_line_width(&style_bg, LV_STATE_DEFAULT, 9);


     //line style_blue
     static lv_style_t style_blue;
     lv_style_reset(&style_blue);
     lv_style_init(&style_blue);
     lv_style_set_line_color(&style_blue, LV_STATE_DEFAULT, LV_COLOR_MAKE(0, 0, 255));
     lv_style_set_line_width(&style_blue, LV_STATE_DEFAULT, 9);

  

     //draw background
     lv_obj_t* scr = lv_obj_create(lv_scr_act(), NULL);
     lv_obj_set_size(scr, 390, 390);
     lv_obj_set_style_local_bg_color(scr, LV_OBJ_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_BLACK);
     lv_obj_set_style_local_border_opa(scr, LV_OBJ_PART_MAIN, LV_STATE_DEFAULT, LV_OPA_TRANSP);
     

     /*Create an Arc_blue*/
     lv_obj_t* arc_blue = lv_arc_create(scr, NULL);
     lv_obj_add_style(arc_blue, LV_ARC_PART_BG, &style_bg);
     lv_arc_set_bg_angles(arc_blue, 228, 312);					//clear background arc
     lv_obj_set_size(arc_blue, 380, 380);					//set size of weight
     lv_obj_align(arc_blue, NULL, LV_ALIGN_CENTER, 0, 0);
     lv_arc_set_angles(arc_blue, 228, 270);
     lv_obj_add_style(arc_blue, LV_ARC_PART_BG, &style_bg);
     lv_obj_add_style(arc_blue, LV_ARC_PART_INDIC, &style_blue);
 
 }

在main函数中调用arc_test()函数，并运行，运行效果图如下