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fix(docs): clarify how to pass color index... (#7554)

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Victor Wheeler
2025-01-07 06:01:33 -07:00
committed by GitHub
parent 51aaf7bcde
commit 935b4016a3
1 changed files with 2 additions and 1 deletions
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docs/details/widgets/canvas.rst
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@@ -61,7 +61,8 @@ Drawing
To set an individual pixel's color on the Canvas, use
:cpp:expr:`lv_canvas_set_px(canvas, x, y, color, opa)`. With indexed color formats
(``LV_COLOR_FORMAT_I1/2/4/8``) pass the color index as the ``color`` argument.
(``LV_COLOR_FORMAT_I1/2/4/8``) pass the color index as the ``color`` argument by using
the *blue* channel in the ``color`` value, e.g. :cpp:expr:`lv_color_make(0, 0, index)`.
:cpp:expr:`lv_canvas_fill_bg(canvas, lv_color_hex(0x00ff00), LV_OPA_50)` fills the whole
Canvas to blue with 50% opacity. Note that if the current color format