Created
October 20, 2020 20:19
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| const { round, floor, ceil } = Math; | |
| let correct = [0,0,0]; | |
| function test(dpr, dim) { | |
| let clientWidth = round(dim / dpr); | |
| let scaled = clientWidth * dpr; | |
| if (round(scaled) === dim) { | |
| correct[0]++; | |
| } | |
| if (floor(scaled) === dim) { | |
| correct[1]++; | |
| } | |
| if (ceil(scaled) === dim) { | |
| correct[2]++; | |
| } | |
| } | |
| function testWidths(widths) { | |
| let weighted_correct = [0,0,0]; | |
| let weighted_total = 0; | |
| // from https://arh.antoinevastel.com/reports/stats/deviceType_screen-devicePixelRatio_report.html | |
| [ | |
| [1, 0.8888888955116272], | |
| [8, 0.8955223880597015], | |
| [5, 0.8999999761581421], | |
| [1, 0.9599999785423279], | |
| [1, 0.8500000238418579], | |
| [5, 1.125], | |
| [1, 1.7647058823529411], | |
| [2, 1.7999999523162842], | |
| [176, 1.5], | |
| [362, 1.25], | |
| [1, 1.7000000476837158], | |
| [1, 1.700084924697876], | |
| [4, 1.3043478260869565], | |
| [1, 1.399999976158142], | |
| [1, 1.3953488372093024], | |
| [2, 1.3333333333333333], | |
| [1, 1.1145833730697632], | |
| [2, 1.375], | |
| [1, 1.1041666269302368], | |
| [14, 1.100000023841858], | |
| [5, 1.5625], | |
| // [7615, 1], | |
| [3, 1.2999999523162842], | |
| [2, 1.600000023841858], | |
| [2, 1.5789473684210527], | |
| [5, 1.2], | |
| [1, 1.3312500715255737], | |
| [22, 1.75], | |
| [3, 2.2222222222222223], | |
| [1, 2.25], | |
| [4, 2.608695652173913], | |
| [25, 2.75], | |
| // [1284, 2], | |
| [2, 2.1000001430511475], | |
| [12, 2.549999952316284], | |
| [1, 2.1875], | |
| [15, 2.5], | |
| [1, 2.0001001358032227], | |
| [1, 2.3375000953674316], | |
| [47 , 2.625], | |
| // [208, 3], | |
| [19, 3.5], | |
| [2, 3.4000000953674316], | |
| // [33, 4], | |
| ].forEach((pair) => { | |
| let [count, dpr] = pair; | |
| widths.forEach(test.bind(null, dpr)); | |
| for (let ii = 0; ii < correct.length; ++ii) { | |
| weighted_correct[ii] += correct[ii] / widths.length * count; | |
| correct[ii] = 0; | |
| } | |
| weighted_total += count; | |
| }); | |
| let labels = ['Math.round', 'Math.floor', 'Math.ceil']; | |
| console.log(weighted_correct.map((a, idx)=>labels[idx] + ': ' + (100*a / weighted_total).toFixed(1)).join('\n')); | |
| } | |
| let widths = []; | |
| for (let ii = 1; ii < 1000; ++ii) { | |
| widths.push(ii); | |
| } | |
| testWidths(widths); | |
| console.log(''); | |
| testWidths([480, 640, 768, 800, 1024, 1080, 1280, 1920, 2560, 3840]); |
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| All resolutions: | |
| Math.round: 69.1 | |
| Math.floor: 56.8 | |
| Math.ceil: 56.6 | |
| Common resolutions only: | |
| Math.round: 80.9 | |
| Math.floor: 70.6 | |
| Math.ceil: 76.3 |
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