Blocky Pond JS easymode

//Blocky Pond - Ultimate Duck Patrol :)
//Written by EvilGeniusJamie

var lastPos;
var angle;
var foundDuck;
var found;

function calcSwim() {
  if (loc_x() <= 10) {
    swim(0,50);
  } else if (loc_x() >= 90) {
    swim(180,50);
  } else if (speed() === 0) {
    swim(0,50);
  }
}

function findDuck(lastPos) {
  angle = lastPos;
  found = false;
  while (found === false) {
    if (scan(angle) < 70) {
      found = true;
    } else if (scan(angle + 90) < 70) {
      found = true;
      angle = angle + 90;
    } else if (scan(angle + 180) < 70) {
      found = true;
      angle = angle + 180;
    } else if (scan(angle + 270) < 70) {
      found = true;
      angle = angle + 270;
    } else {
      calcSwim();
      angle = angle + 1;
      if (angle == 360) {
        found = true;
        angle = -1;
      }
    }
  }
  return angle;
}


swim(0, 50);
foundDuck = findDuck(0);
while (true) {
  if (scan(foundDuck) < 70) {
    cannon(foundDuck, scan(foundDuck));
  } else {
    foundDuck = findDuck(foundDuck);
  }
}