tarea" class="prism-editor__textarea">const quadrants = {
  id: 'quadrants',
  beforeDraw(chart, args, options) {
    const {ctx, chartArea: {left, top, right, bottom}, scales: {x, y}} = chart;
    const midX = x.getPixelForValue(0);
    const midY = y.getPixelForValue(0);
    ctx.save();
    ctx.fillStyle = options.topLeft;
    ctx.fillRect(left, top, midX - left, midY - top);
    ctx.fillStyle = options.topRight;
    ctx.fillRect(midX, top, right - midX, midY - top);
    ctx.fillStyle = options.bottomRigh