JS1k: The JavaScript code golfing competition

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a.style.backgroundColor = "#000";
function pointDistance(a, b) {
  return Math.sqrt(Math.pow(a[0]-b[0],2) + Math.pow(a[1]-b[1],2));
}
var w = 300;
var h = 300;
var m = w / 7;
var n = h / 7;
var F = [];
c.fillStyle=c.strokeStyle='#fff';
c.lineWidth = 3;
for (i = 1; i <= 6; i++)
  for (j = 1; j <= 6; j++) {
    c.beginPath();
    c.arc(
      i * m,
      j * n,
      5,
      0,
      2 * Math.PI,
      false
    );
    c.closePath();
    c.fill();
    F.push([i*m, j*n]);
  }
// event flattener
var p = false;
var gestureFinished = false;
var x = 0;
var y = 0;
a.addEventListener("mousedown", function(e) {
  p = true;
  x = e.clientX - a.offsetLeft;
  y = e.clientY - a.offsetTop;
});
a.addEventListener("mouseup", function(e) {
  p = false;
  x = e.clientX - a.offsetLeft;
  y = e.clientY - a.offsetTop;
});
a.addEventListener("mousemove", function(e) {
  x = e.clientX - a.offsetLeft;
  y = e.clientY - a.offsetTop;
});
var A = [];
var knowns = {};
requestAnimationFrame(K=()=>{
    if (!p && !gestureFinished) {
        gestureFinished = true;
        if (Object.keys(knowns).includes(x = JSON.stringify(A))) {
            alert(knowns[x]);
        } else if (A.length > 0) {
            knowns[x] = prompt("What is that?");
        }
    }
    if (p && gestureFinished) {
        A = [];
        gestureFinished = false;
    }
    c.clearRect(0, 0, w, h);
    F.forEach(n=>{
        c.fillStyle = "#fff";
        c.beginPath();
        c.arc(
            n[0],
            n[1],
            5,
            0,
            8,
            false
        );
        c.closePath();
        c.fill();
    });
    A.forEach(n=>{
        c.fillStyle = "red";
        c.beginPath();
        c.arc(
            n[0],
            n[1],
            5,
            0,
            8,
            false
        );
        c.closePath();
        c.fill();
    });
    c.beginPath();
    if (A.length > 0) {c.moveTo.apply(c, A[0]);}
    A.forEach(function(n) {
        c.lineTo.apply(c, n);
    });
    if (p) {
        F.forEach(function(n) {
            if (pointDistance(n, [x, y]) <= 5) {
                if (!A.includes(n)) {
                    A.push(n);
                }
            }
        c.lineTo(x, y);
        });
    }
    c.stroke();
    requestAnimationFrame(K);
});