29 lines
806 B
JavaScript
29 lines
806 B
JavaScript
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export default function (data, dimX, dimY) {
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var xExtent = data.getDataExtent(dimX);
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var yExtent = data.getDataExtent(dimY); // TODO Handle one data situation
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var xSpan = xExtent[1] - xExtent[0] || xExtent[0];
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var ySpan = yExtent[1] - yExtent[0] || yExtent[0];
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var dimSize = 50;
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var tmp = new Uint8Array(dimSize * dimSize);
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for (var i = 0; i < data.count(); i++) {
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var x = data.get(dimX, i);
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var y = data.get(dimY, i);
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var xIdx = Math.floor((x - xExtent[0]) / xSpan * (dimSize - 1));
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var yIdx = Math.floor((y - yExtent[0]) / ySpan * (dimSize - 1));
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var idx = yIdx * dimSize + xIdx;
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tmp[idx] = tmp[idx] || 1;
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}
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var filledCount = 0;
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for (var i = 0; i < tmp.length; i++) {
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if (tmp[i]) {
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filledCount++;
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}
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}
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return filledCount / tmp.length;
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}
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;
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