vectors.js

var r = new Rune({
  container: "#canvas",
  width: 800,
  height: 600
});

// Create a polygon of your letter. This will be closing, but don't
// worry about that.
var n = r.polygon(200, 200)
  .lineTo(0, 0)
  .lineTo(0, -100)
  .lineTo(75, 0)
  .lineTo(75, -100);

// Loop through each of the vectors in the polygon. This is basically
// the x,y positions where the lines end
for(var i = 1; i < n.vars.vectors.length; i++) {

  // to get the actual change between this and the last point,
  // subtract the last point from the current point.
  var thisVector = n.vars.vectors[i];
  var prevVector = n.vars.vectors[i-1];
  var direction = thisVector.sub(prevVector);

  // loop 40 times
  for(var j = 0; j < 40; j++) {

    // find a random position on this vector
    var newDir = direction.multiply(Rune.random(1));

    // add this random position back to the original x
    var x = prevVector.x + newDir.x + n.vars.x;
    var y = prevVector.y + newDir.y + n.vars.y;

    // draw something on that x,y
    r.line(x, y, x + Rune.random(-10, 10), y + Rune.random(-10, 10))
  }
}

n.removeParent();

r.draw();