// so pretty Oh so pretty Glitchy

const rnd = (max) => Math.random() * max;
const rand = (min, max) => Math.random() * (max - min) + min;
const random = Math.random;
const abs = Math.abs;
const atan2 = Math.atan2;
const PI = Math.PI;

//avoid edges by so many units
const baseAngle = 10; // min=0, max=180, step=0.1
const baseStep = 5; // min=0, max=180, step=0.1
const jiggleAngle = 3; // min=0, max=30, step=0.1
const jiggleStep = 3; // min=0, max=30, step=0.1
const length = 5000; // min=100, max=50000, step=100
const margin = 10; // min=0, max=100, step=1 

Canvas.setpenopacity(1);

// Global code will be evaluated once.
const turtle = new Turtle();

// Orient turtle towards origin, used to turn around on the margins  
const turnToHome = () => { 
    turtle.setheading(180+atan2(turtle.y(),turtle.x())*180/PI);
}       

turtle.left((180-baseAngle)/2);

// The walk function will be called until it returns false.
function walk(i) {
    turtle.right(180-baseAngle+rand(-jiggleAngle,jiggleAngle));
    turtle.forward(baseStep+rnd(jiggleStep));
    turtle.left(180-baseAngle+rand(-jiggleAngle,jiggleAngle));
    turtle.forward(baseStep+rnd(jiggleStep));
    
 
    if (abs(turtle.x())>100-margin || abs(turtle.y())>100-margin) { 
        turnToHome();
        turtle.left((180-baseAngle)/2);
        if (i>length) return false;
    }
    
    return true;
}