Added sliders to make this easier to experiment with as you get some cool effects by inverting the radii values.
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// Forked from "Expanding Circles" by dinubs // https://turtletoy.net/turtle/5ff4c64505 // You can find the Turtle API reference here: https://turtletoy.net/syntax Canvas.setpenopacity(1); // Global code will be evaluated once. const turtle = new Turtle(); let radiusMin = 1; // min=0, max=20, step=1 let radiusMax = 10; // min=1, max=30, step=1 let lineLengthMin = 5; // min=0, max=20, step=1 let lineLengthMax = 10; // min=1, max=30, step=1 let iterations = 8; // min=1, max=30, step=1 let fraction = 1; // min=1, max=30, step=1 function random(range) { return Math.floor(Math.random() * (range[1] - range[0]) ) + range[0]; } // The walk function will be called until it returns false. function walk(i) { turtle.home(); turtle.seth(i / fraction); turtle.penup(); const multiplier = Math.floor(i / 360) + .5; turtle.forward(random([radiusMin,radiusMax]) * multiplier); turtle.pendown() turtle.forward(random([lineLengthMin,lineLengthMax])); return i < 360 * iterations; }