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50 lines
1.2 KiB
50 lines
1.2 KiB
.. _barcode:
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=======
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Barcode
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=======
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Barcode generation with LVGL. Uses
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`code128 <https://github.com/fhunleth/code128>`__ by
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`fhunleth <https://github.com/fhunleth>`__.
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.. _barcode_usage:
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Usage
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-----
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Enable :c:macro:`LV_USE_BARCODE` in ``lv_conf.h``.
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Use :cpp:func:`lv_barcode_create` to create a barcode object, and use
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:cpp:func:`lv_barcode_update` to generate a barcode.
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Call :cpp:func:`lv_barcode_set_scale` to adjust scaling,
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call :cpp:func:`lv_barcode_set_dark_color` and :cpp:func:`lv_barcode_set_light_color`
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adjust color, call :cpp:func:`lv_barcode_set_direction` will set
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direction to display, and call :cpp:func:`lv_barcode_update` again to regenerate
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the barcode.
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Notes
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-----
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- It is best not to manually set the width of the barcode, because when
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the width of the object is lower than the width of the barcode, the
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display will be incomplete due to truncation.
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- The scale adjustment can only be an integer multiple, for example,
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:cpp:expr:`lv_barcode_set_scale(barcode, 2)` means 2x scaling.
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- The direction adjustment can be :cpp:enumerator:`LV_DIR_HOR` or :cpp:enumerator:`LV_DIR_VER`
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.. _barcode_example:
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Example
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-------
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.. include:: ../examples/libs/barcode/index.rst
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.. _barcode_api:
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API
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---
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:ref:`code128`
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