cione-comp-lib
Version:
`$ yarn add cione-comp-lib` 或者 `$ npm i cione-comp-lib -S`
25 lines (24 loc) • 817 B
JavaScript
function evaluateBarSparseness(data, dimX, dimY) {
var xExtent = data.getDataExtent(dimX);
var yExtent = data.getDataExtent(dimY);
var xSpan = xExtent[1] - xExtent[0] || xExtent[0];
var ySpan = yExtent[1] - yExtent[0] || yExtent[0];
var dimSize = 50;
var tmp = new Uint8Array(dimSize * dimSize);
for (var i = 0; i < data.count(); i++) {
var x = data.get(dimX, i);
var y = data.get(dimY, i);
var xIdx = Math.floor((x - xExtent[0]) / xSpan * (dimSize - 1));
var yIdx = Math.floor((y - yExtent[0]) / ySpan * (dimSize - 1));
var idx = yIdx * dimSize + xIdx;
tmp[idx] = tmp[idx] || 1;
}
var filledCount = 0;
for (var i = 0; i < tmp.length; i++) {
if (tmp[i]) {
filledCount++;
}
}
return filledCount / tmp.length;
}
export { evaluateBarSparseness as default };