esp-idf/examples/peripherals/lcd/gc9a01/main/lvgl_demo_ui.c

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/*
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* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: CC0-1.0
*/
// This demo UI is adapted from LVGL official example: https://docs.lvgl.io/master/widgets/extra/meter.html#simple-meter
#include "lvgl.h"
static lv_obj_t *meter;
static void set_value(void *indic, int32_t v)
{
lv_meter_set_indicator_end_value(meter, indic, v);
}
void example_lvgl_demo_ui(lv_obj_t *scr)
{
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meter = lv_meter_create(scr);
lv_obj_center(meter);
lv_obj_set_size(meter, 200, 200);
/*Add a scale first*/
lv_meter_scale_t *scale = lv_meter_add_scale(meter);
lv_meter_set_scale_ticks(meter, scale, 41, 2, 10, lv_palette_main(LV_PALETTE_GREY));
lv_meter_set_scale_major_ticks(meter, scale, 8, 4, 15, lv_color_black(), 10);
lv_meter_indicator_t *indic;
/*Add a blue arc to the start*/
indic = lv_meter_add_arc(meter, scale, 3, lv_palette_main(LV_PALETTE_BLUE), 0);
lv_meter_set_indicator_start_value(meter, indic, 0);
lv_meter_set_indicator_end_value(meter, indic, 20);
/*Make the tick lines blue at the start of the scale*/
indic = lv_meter_add_scale_lines(meter, scale, lv_palette_main(LV_PALETTE_BLUE), lv_palette_main(LV_PALETTE_BLUE), false, 0);
lv_meter_set_indicator_start_value(meter, indic, 0);
lv_meter_set_indicator_end_value(meter, indic, 20);
/*Add a red arc to the end*/
indic = lv_meter_add_arc(meter, scale, 3, lv_palette_main(LV_PALETTE_RED), 0);
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_palette_main(LV_PALETTE_RED), lv_palette_main(LV_PALETTE_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_palette_main(LV_PALETTE_GREY), -10);
/*Create an animation to set the value*/
lv_anim_t a;
lv_anim_init(&a);
lv_anim_set_exec_cb(&a, 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);
}