function drawDatasetThumbnails()

in src/playground.ts [993:1025]

• 19 lines of code
• 5 McCabe index (conditional complexity)

function drawDatasetThumbnails() {
  function renderThumbnail(canvas, dataGenerator) {
    let w = 100;
    let h = 100;
    canvas.setAttribute("width", w);
    canvas.setAttribute("height", h);
    let context = canvas.getContext("2d");
    let data = dataGenerator(200, 0);
    data.forEach(function(d) {
      context.fillStyle = colorScale(d.label);
      context.fillRect(w * (d.x + 6) / 12, h * (d.y + 6) / 12, 4, 4);
    });
    d3.select(canvas.parentNode).style("display", null);
  }
  d3.selectAll(".dataset").style("display", "none");

  if (state.problem === Problem.CLASSIFICATION) {
    for (let dataset in datasets) {
      let canvas: any =
          document.querySelector(`canvas[data-dataset=${dataset}]`);
      let dataGenerator = datasets[dataset];
      renderThumbnail(canvas, dataGenerator);
    }
  }
  if (state.problem === Problem.REGRESSION) {
    for (let regDataset in regDatasets) {
      let canvas: any =
          document.querySelector(`canvas[data-regDataset=${regDataset}]`);
      let dataGenerator = regDatasets[regDataset];
      renderThumbnail(canvas, dataGenerator);
    }
  }
}