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  <svg id="sample">



  border:solid 3px #cccccc;
  height: 300px;
  width: 300px;


                values = [0,150,200]; //yの値

function update() {
  // 配列の個数を n に代入。xの値になる。
  var n = values.length;

  // 線を引く
  var polyline ='svg#sample').selectAll('polyline').data(values).enter()
    // アトリビュートは一つズス設定
    .attr('points',, i) {
      return (30) + ' ' + (30);
  // <svg> の中の <circle> n回追加し、values を割り当てる
  var circles ="svg#sample").selectAll('circle').data(values)
  // アトリビュートは一つズス設定
    .attr('fill', 'red')
    .attr('cx', function(d, i) { return i * 280 / n + 90; })
    .attr('cy', function(d, i) { return d * 280 + 90; })
    .attr('r', 5);

  // アニメーションの設定。
    .attr('fill', 'green')
    .attr('cx', function(d, i) { return i * 280/n + 30; })
    .attr('cy', function(d, i) { return d + 30; })
    .attr('r', 20);
  console.log (n);

  // 線の位置は同じ数値を
    .attr('points',, i) {
      return (i*280/n + 30) + ' ' + (d + 30);