@bluecateng/pelagos-charts
Version:
43 lines • 1.2 kB
JavaScript
export default (data, selected, groupMapsTo, labelMapsTo, valueMapsTo) => {
const selectedSet = new Set(selected);
const allSelected = selectedSet.size === 0;
const groupSet = new Set();
const labelSet = new Set();
const stackData = new Map();
const groupIndex = new Map();
const hintValues = new Map();
for (const d of data) {
const group = d[groupMapsTo];
if (!groupIndex.has(group)) {
groupIndex.set(group, groupIndex.size);
}
if (allSelected || selectedSet.has(group)) {
const value = d[valueMapsTo];
groupSet.add(group);
if (value !== null) {
const label = d[labelMapsTo];
labelSet.add(label);
const hintValue = [group, value];
const hintList = hintValues.get(label);
if (hintList) {
hintList.push(hintValue);
} else {
hintValues.set(label, [hintValue]);
}
const groupMap = stackData.get(label);
if (groupMap) {
groupMap.set(group, value);
} else {
stackData.set(label, new Map([[group, value]]));
}
}
}
}
return {
stackData,
groupSet,
groupIndex,
hintValues,
labelSet
};
};