@visactor/vgrammar-wordcloud/es/spirals.js

WordCloud layout transform for VGrammar

export const spirals = {
    archimedean: archimedeanSpiral,
    rectangular: rectangularSpiral
};

function archimedeanSpiral(size) {
    const e = size[0] / size[1];
    return t => [ e * (t *= .1) * Math.cos(t), t * Math.sin(t) ];
}

function rectangularSpiral(size) {
    const dx = 4 * size[0] / size[1];
    let x = 0, y = 0;
    return t => {
        const sign = t < 0 ? -1 : 1;
        switch (Math.sqrt(1 + 4 * sign * t) - sign & 3) {
          case 0:
            x += dx;
            break;

          case 1:
            y += 4;
            break;

          case 2:
            x -= dx;
            break;

          default:
            y -= 4;
        }
        return [ x, y ];
    };
}
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