Sacred Mandala

// 014 - Sacred Mandala (geometry)
// 1:1 Original algorithm engine source
function createSacredMandala() {
  return {
    setup() {
    },
    render(context, timeState, params) {
      const { ctx, width, height } = context;
      const t = timeState.time * Number(params.speed || 0.5);
      const folds = Number(params.folds || 12);
      const maxR = Math.min(width, height) * 0.42;
      ctx.fillStyle = "rgba(8, 9, 13, 0.2)";
      ctx.fillRect(0, 0, width, height);
      const cx = width * 0.5;
      const cy = height * 0.5;
      const rings = 8;
      for (let r = 1; r <= rings; r++) {
        const ringRadius = r / rings * maxR;
        const ringOffset = t * (r % 2 === 0 ? 0.3 : -0.3) + r * 0.2;
        ctx.save();
        ctx.translate(cx, cy);
        for (let i = 0; i < folds; i++) {
          ctx.rotate(Math.PI * 2 / folds);
          const petalW = ringRadius * 0.35 * (1 + 0.2 * Math.sin(t * 2 + r));
          const petalH = maxR / rings * 1.4;
          ctx.beginPath();
          ctx.ellipse(0, ringRadius, petalW, petalH, ringOffset, 0, Math.PI * 2);
          const hue = (r * 35 + i * (360 / folds) + t * 20) % 360;
          ctx.strokeStyle = hsla(hue, 90, 65, 0.65);
          ctx.lineWidth = 1.2;
          ctx.stroke();
        }
        ctx.restore();
      }
    }
  };
}

// Default parameters from content metadata
const defaultParams = [
  {
    "key": "folds",
    "label": "Rotational Symmetry (Folds)",
    "type": "range",
    "min": 6,
    "max": 24,
    "step": 2,
    "defaultValue": 12,
    "description": "Kaleidoscopic sector count"
  },
  {
    "key": "speed",
    "label": "Spin Rate",
    "type": "range",
    "min": 0.1,
    "max": 2,
    "step": 0.1,
    "defaultValue": 0.5,
    "description": "Harmonic oscillation speed"
  }
];

if (!window.__art_instances) window.__art_instances = {};
if (!window.__art_instances['sacred-mandala']) {
  const inst = typeof createSacredMandala === 'function' ? createSacredMandala() : null;
  if (inst && inst.setup) {
    inst.setup({ ctx, width, height, dpr: 1, aspectRatio: width / height }, defaultParams);
  }
  window.__art_instances['sacred-mandala'] = inst;
}

const instance = window.__art_instances['sacred-mandala'];
if (instance && instance.render) {
  instance.render(
    { ctx, width, height, dpr: 1, aspectRatio: width / height },
    { time, deltaTime: dt, frameCount: Math.floor(time * 60), fps: 60 },
    defaultParams
  );
}