Function updateStacks

src/core/core.datasetController.js:152–175

(controller, parsed)

}

function updateStacks(controller, parsed) {
  const {chart, _cachedMeta: meta} = controller;
  const stacks = chart._stacks || (chart._stacks = {}); // map structure is {stackKey: {datasetIndex: value}}
  const {iScale, vScale, index: datasetIndex} = meta;
  const iAxis = iScale.axis;
  const vAxis = vScale.axis;
  const key = getStackKey(iScale, vScale, meta);
  const ilen = parsed.length;
  let stack;

  for (let i = 0; i < ilen; ++i) {
    const item = parsed[i];
    const {[iAxis]: index, [vAxis]: value} = item;
    const itemStacks = item._stacks || (item._stacks = {});
    stack = itemStacks[vAxis] = getOrCreateStack(stacks, key, index);
    stack[datasetIndex] = value;

    stack._top = getLastIndexInStack(stack, vScale, true, meta.type);
    stack._bottom = getLastIndexInStack(stack, vScale, false, meta.type);

    const visualValues = stack._visualValues || (stack._visualValues = {});
    visualValues[datasetIndex] = value;
  }
}

function getFirstScaleId(chart, axis) {
  const scales = chart.scales;