Canvas.setpenopacity(-1);

// User-adjustable sliders using Turtletoy inline syntax
let Layers = 3;             // min=1, max=6, step=1
let RaysPerLayer = 70;      // min=20, max=150, step=5
let Twist = 0.4;            // min=0.1, max=2.0, step=0.1
let Scale = 1.0;            // min=0.5, max=2.0, step=0.1
let Waviness = 0.3;         // min=0.05, max=1.0, step=0.05

const turtle = new Turtle();

const totalSteps = Layers * RaysPerLayer;

function walk(i) {
    if (i >= totalSteps) return false;

    const layer = Math.floor(i / RaysPerLayer);
    const ray = i % RaysPerLayer;

    const layerOffsets = [
        [-25 * Scale, 15 * Scale],
        [25 * Scale, 15 * Scale],
        [0, -25 * Scale],
        [-15 * Scale, -20 * Scale],
        [15 * Scale, -20 * Scale],
        [0, 25 * Scale]
    ];
    
    const offsetIndex = layer % layerOffsets.length;
    const cx = layerOffsets[offsetIndex][0];
    const cy = layerOffsets[offsetIndex][1];

    const angle = (ray / RaysPerLayer) * Math.PI * 2 + (layer * Twist);
    const innerRadius = (5 + Math.sin(ray * Waviness) * 10) * Scale;
    const outerRadius = (65 + Math.cos(ray * (Waviness * 0.67)) * 25) * Scale;

    turtle.penup();
    turtle.goto(cx + Math.cos(angle) * innerRadius, cy + Math.sin(angle) * innerRadius);
    turtle.pendown();

    const curveOffset = angle + 0.9 + (layer * (Twist * 0.625));
    const targetX = cx + Math.cos(curveOffset) * outerRadius;
    const targetY = cy + Math.sin(curveOffset) * outerRadius;

    turtle.goto(targetX, targetY);

    return true;
}