Ring

dots scattered in an annulus by randomVector(innerRadius:outerRadius:), relative to scale, so the ring keeps its proportion

Run

swift run --package-path Examples Example-Randomness-Ring

Source

Examples/Randomness/Ring/Sketch.swift

import Ollin

/// `randomVector(innerRadius:outerRadius:)` scatters points in an annulus: 1500
/// dots a frame between an inner and outer radius around the canvas center.
/// Radii and dot size are multiplied by `scale` (`shortSide / 1000`), so the
/// piece keeps its proportions at any window size. Unseeded, so the ring
/// shimmers as it re-rolls.
@main
final class Ring: Sketch {
    override func setup() {
        noStroke()
        fill(Color(white: 1, alpha: 0.5))
    }

    override func draw() {
        background(.black)
        let center = center
        let inner = 150 * scale
        let outer = 350 * scale
        for _ in 0..<1500 {
            drawCircle(center: center + randomVector(innerRadius: inner, outerRadius: outer),
                   radius: 2 * scale)
        }
    }
}