code.js

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

var myPoly = r.polygon(100, 100)
  .lineTo(0, 0)
  .lineTo(200, 150)
  .lineTo(75, 400);

for(var x = 0; x < r.width; x+= 30) {
  for(var y = 0; y < r.height; y+= 30) {
    if(myPoly.contains(x, y))
      r.circle(x, y, 15)
  }
}

myPoly.removeParent();

r.play();