I've written a pascal version of some color controls which I've ported to Lazarus. Here is a link to a page with demo video:
https://www.codebot.org/delphi/?doc=9524 These controls includes a hue picker that has 2 styles (radial as shown and bar), a saturation pick again with 2 styles, and an alpha picker. I also have a color value slider edit box, where you can type out a R, G, B values in bytes or floats, and it has a drop down with a left right slider that shows you the colors. They should be enough to create a decent pascal native color picker. Quick example, adding the alpha picker and drop down edit is trivial: https://s3.amazonaws.com/cache.codebot.org/videos/color-lazarus-example.mp4
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