rp2040 zero rainbow using palette#82
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| // 0 is off and 1 is max brightness | ||
| let brightness = 0.05 as f64; | ||
| (brightness * u8::MAX as f64) as u8 |
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The previous code uses 32 as brightness which is 12.5% not 5%.
Why not leaving the value 32 and only adding a comment like /* 12.5% */
| (wheel_pos * 3, 255 - (wheel_pos * 3), 0).into() | ||
| ws.write(brightness( | ||
| once({ | ||
| let hsl = Hsl::<Rgb, _>::new(hue as f64, 1.0, 0.5); |
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hue is already an f64 from its declaration. No need to cast it here.
| }), | ||
| { | ||
| // 0 is off and 1 is max brightness | ||
| let brightness = 0.05 as f64; |
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| let brightness = 0.05 as f64; | |
| let brightness = 0.05f64; |
| }, | ||
| )) | ||
| .unwrap(); | ||
| hue += 360.0 / 6.0 / u8::MAX as f64; |
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All these values are constants. What’s the intent in that math?
The current code turns the wheel by (1/255)rad (~1.41°) per iteration.
We don’t need this to match strictly. This should be enough:
| hue += 360.0 / 6.0 / u8::MAX as f64; | |
| hue += 1.0; // advance by 1° |
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The intent is that there are 256 steps of changes in a value of either r, g, b in every 1/6 of 360 degrees, so adding the hue by 360/6/256 makes sure that there will actually be a change in pixels every iteration of the loop. This can be changed to 1 if that's what's prefered by this project.
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Rather than do math with rgb numbers directly, it's much simpler to just use HSL and a color conversion library to convert HSL into RGB. Imo this makes the code simpler and easier to understand.