Function getBoxSize

src/plugins/plugin.legend.js:24–37

(labelOpts, fontSize)

 */

const getBoxSize = (labelOpts, fontSize) => {
  let {boxHeight = fontSize, boxWidth = fontSize} = labelOpts;

  if (labelOpts.usePointStyle) {
    boxHeight = Math.min(boxHeight, fontSize);
    boxWidth = labelOpts.pointStyleWidth || Math.min(boxWidth, fontSize);
  }

  return {
    boxWidth,
    boxHeight,
    itemHeight: Math.max(fontSize, boxHeight)
  };
};

const itemsEqual = (a, b) => a !== null && b !== null && a.datasetIndex === b.datasetIndex && a.index === b.index;