Barcode

The LVGL Barcode utility enables you to generate Code-128 bar codes. It uses the code128 library by fhunleth.

Usage

Set LV_USE_BARCODE to 1 in lv_conf.h.

Use lv_barcode_create() to create a barcode object, and use lv_barcode_update() to generate a barcode.

Call lv_barcode_set_scale() to adjust scaling, call lv_barcode_set_dark_color() and lv_barcode_set_light_color() adjust colors. Call lv_barcode_set_direction() to set the bar code's orientation. After any of a bar code's settings have changed, call lv_barcode_update() again to regenerate it.

Notes

It is best not to manually set the width of the barcode, because when the width of the Widget is lower than the width of the barcode, the display will be incomplete due to truncation.
The scale adjustment can only be an integer multiple, for example, lv_barcode_set_scale(barcode, 2) means 2x scaling.
The direction setting can be LV_DIR_HOR or LV_DIR_VER.

Example

Create a Barcode

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

/**
 * Create a Barcode
 */
void lv_example_barcode_1(void)
{
    lv_color_t bg_color = lv_palette_lighten(LV_PALETTE_LIGHT_BLUE, 5);
    lv_color_t fg_color = lv_palette_darken(LV_PALETTE_BLUE, 4);

    lv_obj_t * barcode = lv_barcode_create(lv_screen_active());
    lv_obj_set_height(barcode, 50);
    lv_obj_center(barcode);

    /*Set color*/
    lv_barcode_set_dark_color(barcode, fg_color);
    lv_barcode_set_light_color(barcode, bg_color);

    /*Add a border with bg_color*/
    lv_obj_set_style_border_color(barcode, bg_color, 0);

    /*Set data*/
    lv_barcode_update(barcode, "https://lvgl.io");
}

#endif

API

code128.h

lv_barcode.h

lv_types.h