Hopalong attractor. Code derived from evilotto's Lorenz XZ
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// 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(); const n = 20000; //min=10 max=30000 step=10 turtle.penup(); function project() { turtle.jump(x,y); turtle.circle(0.01); } x = 0.0; y = 0.0; project(); turtle.pendown(); const a = 8.44 ; //min=0 max=10 step=.01 const b = 6.47; //min=0 max=10 step=.01 const c = 5.05; //min=0 max=10 step=.01 // The walk function will be called until it returns false. function walk(i) { nx = y-Math.sqrt(Math.abs(b*x-c))*Math.sign(x); ny = a-x x = nx; y = ny; project(); return i < n }