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const field = collection.pivotField || "title";
const width = collection.pivotWidth || 200;
const groups = new Map;
for (const doc of docs) {
const val = doc[field];
if (val === undefined) continue;
const l = groups.get(val);
if (l) {
l.push(doc);
} else {
groups.set(val, [doc]);
}
}
let minSize = Infinity;
groups.forEach((val, key) => {
minSize = Math.min(minSize, val.length);
});
const numCols = collection.pivotNumColumns || Math.ceil(Math.sqrt(minSize));
const docMap = new Map;
const groupNames = [];
let x = 0;
groups.forEach((val, key) => {
let y = 0;
let xCount = 0;
groupNames.push({type:"text", text:String(key), x, y:width + 50, width: width * 1.25 * numCols, height:100, fontSize:collection.pivotFontSize});
for (const doc of val) {
docMap.set(doc, {x: x + xCount * width * 1.25, y:-y, width, height:width});
xCount++;
if (xCount >= numCols) {
xCount = 0;
y += width * 1.25;
}
}
x += width * 1.25 * (numCols + 1);
});
return {state:{ map: docMap}, views:groupNames };
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