Tinkerings with math...

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// You can find the Turtle API reference here: https://turtletoy.net/syntax Canvas.setpenopacity(0.5); // Global code will be evaluated once. const turtle = new Turtle(); turtle.penup(); const pi = Math.PI; let rx = 95.0; let ry = 50.0; let ang = 0.0; let step = pi / 180.0; let freq = 3.0; let freqMod = 199.0; // The walk function will be called until it returns false. function walk(i) { turtle.penup(); turtle.goto( rx*Math.sin(ang), ry*Math.cos(ang*freq) + Math.cos(ang*freqMod) ); ang += step; turtle.pendown(); turtle.goto( rx*Math.sin(ang), ry*Math.cos(ang*freq) + Math.cos(ang*freqMod) ); return ang < pi*20.0; }