// ============================================================
//  WANDER — BOUNDED RANDOM WALK
//  A random walk that turns back at the edge.
//  Change the seed for a new design.
// ============================================================

// --- walk ---
let nsteps    = 420  // [50:2000] total steps
let stepsize  = 2.6  // [1:0.2:6] distance per step, mm
let turnrange = 35   // [5:80] max random turn angle, degrees
let boundary  = 36   // [15:44] bounce distance from centre, mm

seed 11
stitchlen 2
repeat nsteps [
  fd stepsize
  rt random(turnrange * 2) - turnrange
  if sqrt(xcor * xcor + ycor * ycor) > boundary [
    rt 140 + random 80
  ]
]