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import {
polygonArea as d3PolygonArea
} from 'd3-polygon';
export default function () {
//begin: internals
var clippingPolygon,
dataArray,
siteCount,
totalArea,
halfAverageArea;
//end: internals
///////////////////////
///////// API /////////
///////////////////////
function _halfAverageArea(d, i, arr, voronoiMapSimulation) {
var shouldUpdateInternals = false;
if (clippingPolygon !== voronoiMapSimulation.clip()) {
clippingPolygon = voronoiMapSimulation.clip();
shouldUpdateInternals |= true;
}
if (dataArray !== arr) {
dataArray = arr;
shouldUpdateInternals |= true;
}
if (shouldUpdateInternals) {
updateInternals();
}
return halfAverageArea;
};
///////////////////////
/////// Private ///////
///////////////////////
function updateInternals() {
siteCount = dataArray.length;
totalArea = d3PolygonArea(clippingPolygon);
halfAverageArea = totalArea / siteCount / 2; // half of the average area of the the clipping polygon
}
return _halfAverageArea;
};